diff --git a/.changeset/stack-chain-config.md b/.changeset/stack-chain-config.md
new file mode 100644
index 0000000000..a279e4a982
--- /dev/null
+++ b/.changeset/stack-chain-config.md
@@ -0,0 +1,15 @@
+---
+"@parity/truapi-host": major
+---
+
+The core takes its chain configuration from a Trinity stack descriptor. `ProductRuntimeConfig.stack` replaces `people`,
+`bulletin`, `assetHub` and `networkSuffix`: `pointer` is the stack's link (`polkadotapp://stack?key=0x…&url=…`),
+`descriptor` the bytes of the signed copy the host build bundles, and `allowsReservedValues` whether the build may run a
+stack on Polkadot's genesis hashes or the `dot` TLD. The core verifies the copy against the pointer's key and refuses a
+pointer without a key, a descriptor without a People or Bulletin chain, and a reserved value the build does not allow.
+`getChainInfo` answers from the descriptor's `chains` and `network`, so the `supportedChains` host callback and the
+`HostChainSet` and `HostChainEntry` types are removed. The test host runs a stack built from its parts:
+`mockRuntimeConfig()` returns a `testStack` over the `MOCK_GENESIS` chains, which only the `wasm/testing` bundle reads,
+`startTestHost` and `createMockClient` take `Partial<MockRuntimeConfig>` overrides, `fromNetworks` and `liveChain` build
+it from their chains, and `MockHostConfig.servedChains` replaces `supportedChains` as the genesis hashes
+`featureSupported` answers from under `onlyServedChains`.
diff --git a/.changeset/test-host-unserved-chains.md b/.changeset/test-host-unserved-chains.md
index cc79111945..3021f0be56 100644
--- a/.changeset/test-host-unserved-chains.md
+++ b/.changeset/test-host-unserved-chains.md
@@ -3,6 +3,6 @@
 ---
 
 The mock host can report chains it does not serve as unsupported. `onlyServedChains: true` answers `featureSupported`
-from `supportedChains`, as a real host does, so a product's "network unavailable" path is reachable on a host that
-serves no chains. It defaults to `false`, and becomes the default in a later breaking release. The Rust
+from `servedChains`, as a real host does, so a product's "network unavailable" path is reachable on a host that serves
+no chains. It defaults to `false`, and becomes the default in a later breaking release. The Rust
 `MockConfig::only_served_chains` is the same option.
diff --git a/AGENTS.md b/AGENTS.md
index 7664982b5e..7d6ae7c721 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -10,7 +10,9 @@ rust/crates/
                          (canonical), plus the runtime hosts implement (default `runtime`
                          feature); ships as WASM (browser/node); its `platform` module
                          holds the host syscall traits (storage, navigation, consent, ...),
-                         its `chain` module builds the core's own extrinsics through
+                         its `stack` module resolves the Trinity stack the host runs, the
+                         core's only chain configuration, from the descriptor its build
+                         bundles, its `chain` module builds the core's own extrinsics through
                          `ExtrinsicService` and reads and writes contracts through
                          `EvmContractCaller` with signer-bound prepared transactions;
                          on native targets, its `durable` module follows presigned
diff --git a/Cargo.lock b/Cargo.lock
index 4c9c5a8018..d02f210c60 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5958,6 +5958,7 @@ dependencies = [
  "tokio-tungstenite",
  "tracing",
  "tracing-subscriber",
+ "trinity-stack",
  "truapi-macros",
  "truapi-provider",
  "truapi-verifiable",
diff --git a/README.md b/README.md
index 8efa5255d6..ef5f7fba1c 100644
--- a/README.md
+++ b/README.md
@@ -448,6 +448,12 @@ A stack descriptor describes one deployment of chains and services, as
 conformance vectors. The plan for it and the tools on top of it is in
 [docs/design/trinity-stack-library.md](docs/design/trinity-stack-library.md).
 
+The core takes all of its chain configuration from one stack. A host passes the stack's pointer, the signed descriptor
+its build bundles, and whether the build may use Polkadot's reserved values: its genesis hashes and the `dot` TLD. The
+core verifies the copy against the pointer's key, refuses an unsigned stack and a reserved value the build does not
+allow, and answers `get_chain_info` and the signing role's TLD from the descriptor. See
+[RUNTIME.md](rust/crates/truapi/RUNTIME.md#stack).
+
 ### Wire debugger
 
 [`@parity/truapi-debugger`](js/packages/truapi-debugger) is the consumer for the
diff --git a/android/truapi-host/README.md b/android/truapi-host/README.md
index ff74b4ee98..0f88d622ff 100644
--- a/android/truapi-host/README.md
+++ b/android/truapi-host/README.md
@@ -36,20 +36,21 @@ The package is public, so any authenticated GitHub identity can read it. In GitH
 
 The consuming app must declare `android.permission.INTERNET` — the localhost WebSocket bridge binds a `127.0.0.1` TCP socket, which requires it even for loopback.
 
-`HostRuntimeConfig.networkSuffix` is required. Supply the bare TLD (`dot`,
-`paseo`, or `testnet`) from the same network configuration used by onboarding
-and the People/Bulletin genesis hashes. It must match the People chain's
-`NetworkSuffix.NetworkSuffix`. Include this configuration update in the
-embedding app's package upgrade.
-
-`HostRuntimeConfig.assetHubChainGenesisHash` is required. Supply the Asset Hub
-genesis hash from the same network configuration, as 32 bytes. Product manifests
-are read from the dotNS contracts deployed there, so it is what makes a
-`trustedProducts` grant resolvable: without a usable value no manifest resolves,
-so every cross-product grant not already cached is refused, and the refusal is
-indistinguishable from the other product having granted nothing. Pass 32 zero
-bytes only to declare deliberately that this host has no Asset Hub. Include this
-configuration update in the embedding app's package upgrade.
+`HostRuntimeConfig.stack` is required. It is the Trinity stack the build runs,
+as a `BundledStack`:
+
+- `pointer` is the stack's link, `polkadotapp://stack?key=0x…&url=…`. It must
+  carry a key.
+- `descriptor` is the signed descriptor the build bundles, byte for byte as
+  served. The core verifies it under the pointer's key.
+- `allowsReservedValues` is true only in a Polkadot build. Without it the core
+  refuses a stack that uses Polkadot's genesis hashes or the `dot` TLD.
+
+The core takes every chain it uses from the descriptor, and answers products'
+chain info queries from its `chains` and `network`. The descriptor's TLD is the
+one the wallet's reserved identities derive under. An invalid stack makes the
+`TrUAPIHostRuntime` constructor throw `NativeRuntimeConfigException.Invalid`.
+Include this configuration update in the embedding app's package upgrade.
 
 ### Compatibility
 
@@ -130,10 +131,7 @@ val runtime = TrUAPIHostRuntime(
     bridge = bridge,
     runtimeConfig = HostRuntimeConfig(
         hostName = "My Chat Host",
-        peopleChainGenesisHash = peopleChainGenesisHash,   // exactly 32 bytes
-        bulletinChainGenesisHash = bulletinChainGenesisHash,
-        assetHubChainGenesisHash = assetHubChainGenesisHash,
-        networkSuffix = "dot",
+        stack = bundledStack,
     ),
 )
 // Chat needs an active session; without one every Chat call answers `Denied`.
@@ -307,6 +305,7 @@ import io.parity.truapi.HostBridge
 import io.parity.truapi.HostCoreStorage
 import io.parity.truapi.HostStorage
 import io.parity.truapi.LocalhostBridgeBootstrap
+import uniffi.truapi.BundledStack
 import uniffi.truapi.HostRuntimeConfig
 import uniffi.truapi.ProductExecutionConfig
 import uniffi.truapi.ExecutableKind
@@ -419,13 +418,12 @@ val bridge = MyBridge(webView)
 val runtimeConfig = HostRuntimeConfig(
     hostName = "My Host",
     hostIcon = "https://host.example/icon.png",
-    peopleChainGenesisHash = ByteArray(32),
-    bulletinChainGenesisHash = ByteArray(32),
-    // Stand-in for a real Asset Hub genesis hash. Non-zero on purpose:
-    // all-zero is the "no Asset Hub" sentinel and refuses every cross-product
-    // `trustedProducts` grant.
-    assetHubChainGenesisHash = ByteArray(32) { 1.toByte() },
-    networkSuffix = "dot",
+    stack = BundledStack(
+        // The link the bundled descriptor was published under.
+        pointer = "polkadotapp://stack?key=0x…&url=…",
+        descriptor = webView.context.assets.open("trinity-stack.json").use { it.readBytes() },
+        allowsReservedValues = false,
+    ),
     // Optional: activate a local signing session from host-held BIP-39 entropy
     // (no SSO pairing). Omit for the QR pairing flow.
     localSessionSecret = null,
diff --git a/android/truapi-host/src/main/kotlin/io/parity/truapi/TrUAPIHost.kt b/android/truapi-host/src/main/kotlin/io/parity/truapi/TrUAPIHost.kt
index effc8ef983..fd3089f5bb 100644
--- a/android/truapi-host/src/main/kotlin/io/parity/truapi/TrUAPIHost.kt
+++ b/android/truapi-host/src/main/kotlin/io/parity/truapi/TrUAPIHost.kt
@@ -51,7 +51,6 @@ import uniffi.truapi.HostThemeSubscribeItem
 import uniffi.truapi.ThemeName
 import uniffi.truapi.ThemeVariant
 import uniffi.truapi.AuthState
-import uniffi.truapi.HostChainSet
 import uniffi.truapi.PermissionAuthorizationRequest
 import uniffi.truapi.PermissionAuthorizationStatus
 import uniffi.truapi.PermissionDecision
@@ -317,13 +316,6 @@ interface HostBridge {
     @Throws(HostRejection::class)
     suspend fun featureSupported(request: HostFeatureSupportedRequest): Boolean
 
-    /**
-     * Enumerate the chains this host serves: its environment plus one entry
-     * per chain role.
-     */
-    @Throws(HostRejection::class)
-    fun supportedChains(): HostChainSet = HostChainSet(network = "", chains = emptyList())
-
     /**
      * The chains this host builds as V5 general transactions, each with its
      * transaction extension pipeline; every other chain is built as V4. The
@@ -639,9 +631,6 @@ private class HostCallbackAdapter(private val bridge: HostBridge) : HostCallback
     override suspend fun featureSupported(request: HostFeatureSupportedRequest): Boolean =
         withHostRejection { bridge.featureSupported(request) }
 
-    override fun supportedChains(): HostChainSet =
-        withHostRejection { bridge.supportedChains() }
-
     override suspend fun transactionExtensionVersions(): ExtensionVersionMap =
         withHostRejection { bridge.transactionExtensionVersions() }
 
diff --git a/docs/rfcs/0022-account-derivations.md b/docs/rfcs/0022-account-derivations.md
index ecdeab3c14..f997d9770c 100644
--- a/docs/rfcs/0022-account-derivations.md
+++ b/docs/rfcs/0022-account-derivations.md
@@ -281,7 +281,7 @@ the network the host runs against: `uid.dot` and `peopl.dot` on Polkadot,
 runtime scopes its product contexts with (`product/peopl.<tld>/…`), so accounts,
 contexts and keys agree on which network a person belongs to, and one seed is one
 person per network. A host learns the suffix from the network it is configured
-for (`SigningHostConfig::network_suffix` in the Rust core) and never assumes it.
+for (the `tld` of its stack descriptor, `Stack::tld` in the Rust core) and never assumes it.
 ### Well-known alias accounts
 
 The runtime defines well-known Account Contexts (`resources`, `score`,
diff --git a/hosts/android/.claude/docs/architecture/host-api-products.md b/hosts/android/.claude/docs/architecture/host-api-products.md
index d8f86545b9..f49a4ae128 100644
--- a/hosts/android/.claude/docs/architecture/host-api-products.md
+++ b/hosts/android/.claude/docs/architecture/host-api-products.md
@@ -184,8 +184,8 @@ The core is one process-wide `TrUAPIHostRuntime` with a `TrUAPIProductExecution`
 per product connection, and the Android side mirrors that split:
 
 - `TrUAPIHostRuntimeProvider` (`@Singleton`) builds the runtime lazily on first
-  use from `HostRuntimeConfig` (host identity, People/Bulletin genesis hashes,
-  the local session) and keeps it for the process. Its runtime-level
+  use from `HostRuntimeConfig` (host identity, the Trinity stack the build
+  bundles, the local session) and keeps it for the process. Its runtime-level
   `HostBridge` serves only what the signing runtime asks for — core storage,
   auth state, signing-side chain access, and the confirmations SSO raises.
   Product-scoped calls have no product there and fail closed, as on iOS. It
@@ -235,15 +235,26 @@ it cannot describe. Every variant is covered by
 - **Dispatcher-thread callbacks** (chain, theme, storage, core log) run inline and **must return promptly** — no blocking work. Chain I/O goes through the non-blocking `WebSocketChainProvider`, one per bridge so each notifies the runtime or execution it dials for; theme is served from a cached value.
 - `devicePermissionStatus` and `currentLocale` are left on the shell defaults (not applicable / system locale) — wire them when a product needs them.
 
+### Stack
+
+The core takes every chain it uses, and the chain info it reports to products,
+from the Trinity stack descriptor in `HostRuntimeConfig.stack`. `TrUAPIStack`
+holds each stack's pointer and maps the build's `TestnetEnvironment` to one:
+`TESTNET` runs previewnet, `NIGHTLY` paseo-next-v2 and `PRODUCTION` Polkadot,
+the only one allowed Polkadot's reserved genesis hashes and `dot` TLD. The
+signed descriptors ship byte for byte under
+`feature/products/impl/src/main/assets/stacks/`, and each verifies only under
+the key in its own pointer, so refresh a copy and its pointer together. A copy
+the core refuses fails the runtime boot.
+
 ### Chain agreement
 
-`supportedChains`, `featureSupported(Chain)` and `chainConnect` all answer from
-one `TrUAPIChains` snapshot — resolved at `attach` per execution, and once at
-boot for the runtime — through
-`TrUAPIChains.canDial`. Never answer any of them from the registry directly: the
-registry holds chains with no `wss` endpoints, so the host would advertise or
-promise a chain `chainConnect` then refuses. `TrUAPIChainAgreementTest` pins the
-invariant.
+`featureSupported(Chain)` and `chainConnect` both answer from one
+`TrUAPIChains` snapshot — resolved at `attach` per execution, and once at boot
+for the runtime — through `TrUAPIChains.canDial`. Never answer either from the
+registry directly: the registry holds chains with no `wss` endpoints, so the
+host would promise a chain `chainConnect` then refuses.
+`TrUAPIChainAgreementTest` pins the invariant.
 
 ### Storage
 
diff --git a/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/MediaPermissionIntegrationTest.kt b/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/MediaPermissionIntegrationTest.kt
index 4232c1d97f..f33cea5d47 100644
--- a/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/MediaPermissionIntegrationTest.kt
+++ b/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/MediaPermissionIntegrationTest.kt
@@ -19,6 +19,7 @@ import io.paritytech.polkadotapp.common.utils.permissions.PermissionResult
 import io.paritytech.polkadotapp.feature_products_impl.domain.hostApi.FixedProductId
 import io.paritytech.polkadotapp.feature_products_impl.domain.permissions.handlers.DeviceCapabilityPermissionHandler
 import io.paritytech.polkadotapp.feature_products_impl.domain.truapi.TrUAPIBootstrapInstaller
+import io.paritytech.polkadotapp.feature_products_impl.domain.truapi.TrUAPIStack
 import io.paritytech.polkadotapp.feature_products_impl.domain.webView.ProductWebChromeClient
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -66,10 +67,7 @@ class MediaPermissionIntegrationTest : BaseIntegrationTest() {
         }
         val config = HostRuntimeConfig(
             hostName = "Media permission test",
-            peopleChainGenesisHash = ByteArray(32),
-            bulletinChainGenesisHash = ByteArray(32),
-            assetHubChainGenesisHash = ByteArray(32),
-            networkSuffix = "paseo",
+            stack = TrUAPIStack.PREVIEWNET.bundled(context),
             databaseDirectory = createTempDirectory("truapi").toString(),
         )
         TrUAPIHostRuntime(bridge, config).use { runtime ->
diff --git a/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/RendererLossRecoveryTest.kt b/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/RendererLossRecoveryTest.kt
index 7bb159e0d3..7ffe9efa4a 100644
--- a/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/RendererLossRecoveryTest.kt
+++ b/hosts/android/app/src/androidTest/java/io/paritytech/polkadotapp/app/RendererLossRecoveryTest.kt
@@ -20,6 +20,7 @@ import io.parity.truapi.TrUAPIHostRuntime
 import io.paritytech.polkadotapp.common.utils.RealCoroutineDispatchers
 import io.paritytech.polkadotapp.feature_products_impl.domain.hostApi.FixedProductId
 import io.paritytech.polkadotapp.feature_products_impl.domain.truapi.TrUAPIBootstrapInstaller
+import io.paritytech.polkadotapp.feature_products_impl.domain.truapi.TrUAPIStack
 import io.paritytech.polkadotapp.feature_products_impl.domain.webView.WebViewProvider
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -127,10 +128,7 @@ class RendererLossRecoveryTest : BaseIntegrationTest() {
         private const val PAGE_URL = "$ORIGIN/"
         private val CONFIG = HostRuntimeConfig(
             hostName = "Renderer loss test",
-            peopleChainGenesisHash = ByteArray(32),
-            bulletinChainGenesisHash = ByteArray(32),
-            assetHubChainGenesisHash = ByteArray(32),
-            networkSuffix = "paseo",
+            stack = TrUAPIStack.PREVIEWNET.bundled(InstrumentationRegistry.getInstrumentation().targetContext),
             databaseDirectory = createTempDirectory("truapi").toString(),
         )
 
diff --git a/hosts/android/bindings/truapi-host/build.gradle.kts b/hosts/android/bindings/truapi-host/build.gradle.kts
index 77297b4e09..51c8e08ac5 100644
--- a/hosts/android/bindings/truapi-host/build.gradle.kts
+++ b/hosts/android/bindings/truapi-host/build.gradle.kts
@@ -72,7 +72,11 @@ android {
             )
         }
         getByName("test") { java.srcDirs("src/test/kotlin") }
-        getByName("androidTest") { java.srcDirs("src/androidTest/kotlin") }
+        getByName("androidTest") {
+            java.srcDirs("src/androidTest/kotlin")
+            // The core's own signed stack copies, so a test runtime starts on a stack the core verifies.
+            assets.srcDir("$truapiDir/rust/crates/truapi-host-cli/stacks")
+        }
     }
 
     lint {
diff --git a/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/ContainerHttpAuthorizationTest.kt b/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/ContainerHttpAuthorizationTest.kt
index 3153dba5b3..290a399f78 100644
--- a/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/ContainerHttpAuthorizationTest.kt
+++ b/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/ContainerHttpAuthorizationTest.kt
@@ -62,10 +62,7 @@ class ContainerHttpAuthorizationTest {
         val authorizedLoads = AtomicInteger()
         val config = HostRuntimeConfig(
             hostName = "HTTP authorization test",
-            peopleChainGenesisHash = ByteArray(32),
-            bulletinChainGenesisHash = ByteArray(32),
-            assetHubChainGenesisHash = ByteArray(32),
-            networkSuffix = "paseo",
+            stack = previewnetStack(),
             databaseDirectory = createTempDirectory("truapi").toString(),
         )
 
diff --git a/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/InertHostBridge.kt b/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/InertHostBridge.kt
index 8814d43642..a6cc551712 100644
--- a/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/InertHostBridge.kt
+++ b/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/InertHostBridge.kt
@@ -1,6 +1,8 @@
 package io.parity.truapi
 
 import android.content.Context
+import androidx.test.platform.app.InstrumentationRegistry
+import uniffi.truapi.BundledStack
 import uniffi.truapi.HostDevicePermissionRequest
 import uniffi.truapi.HostFeatureSupportedRequest
 import uniffi.truapi.HostRuntimeConfig
@@ -40,9 +42,17 @@ class InertHostBridge(
 /** A runtime config whose core database lives in [databaseDirectory]. */
 fun instrumentedRuntimeConfig(databaseDirectory: String) = HostRuntimeConfig(
     hostName = "Instrumented test host",
-    peopleChainGenesisHash = ByteArray(32) { 0xa2.toByte() },
-    bulletinChainGenesisHash = ByteArray(32) { 0xbb.toByte() },
-    assetHubChainGenesisHash = ByteArray(32) { 0xcc.toByte() },
-    networkSuffix = "paseo",
+    stack = previewnetStack(),
     databaseDirectory = databaseDirectory,
 )
+
+/** Previewnet's signed descriptor and link, packaged into the test APK from the core's copies. */
+fun previewnetStack(): BundledStack {
+    val assets = InstrumentationRegistry.getInstrumentation().context.assets
+    fun asset(name: String) = assets.open(name).use { it.readBytes() }
+    return BundledStack(
+        pointer = asset("previewnet.link").decodeToString().trim(),
+        descriptor = asset("previewnet.json"),
+        allowsReservedValues = false,
+    )
+}
diff --git a/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/TrUAPIDiagnosticsTest.kt b/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/TrUAPIDiagnosticsTest.kt
index 836dd43bd0..7d7e2b2833 100644
--- a/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/TrUAPIDiagnosticsTest.kt
+++ b/hosts/android/bindings/truapi-host/src/androidTest/kotlin/io/parity/truapi/TrUAPIDiagnosticsTest.kt
@@ -65,9 +65,9 @@ class TrUAPIDiagnosticsTest {
 
         val context = instrumentation.targetContext
 
-        // The People-chain statement store backs the SSO/identity path; the
-        // all-zero genesis is the local-session sentinel. Route any genesis to
-        // the configured node so chain-touching methods can reach a backend.
+        // The People-chain statement store backs the SSO/identity path. Route
+        // any genesis to the configured node so chain-touching methods can
+        // reach a backend.
         val chainNode = args.getString("truapi.chainWs")
         val chainProvider = WebSocketChainProvider({ listOfNotNull(chainNode) }, OkHttpClient())
 
@@ -107,10 +107,7 @@ class TrUAPIDiagnosticsTest {
         val config = HostRuntimeConfig(
             hostName = "Polkadot Android (diagnostics)",
             hostIcon = "https://dot.li/dotli.png",
-            peopleChainGenesisHash = ByteArray(32),
-            bulletinChainGenesisHash = ByteArray(32),
-            assetHubChainGenesisHash = ByteArray(32),
-            networkSuffix = "paseo",
+            stack = previewnetStack(),
             databaseDirectory = createTempDirectory("truapi").toString(),
             // 32 bytes of BIP-39 entropy → a deterministic local signing session
             // (no SSO pairing, fully offline).
diff --git a/hosts/android/docs/DEPLOYMENT.md b/hosts/android/docs/DEPLOYMENT.md
index faa83d3547..a7ea177ed9 100644
--- a/hosts/android/docs/DEPLOYMENT.md
+++ b/hosts/android/docs/DEPLOYMENT.md
@@ -372,7 +372,7 @@ instead. Change them there if your fork needs a different cut.
 
 | Field | `debug` | `nightly` | `safetynet` | `release` | Effect |
 |-------|---------|-----------|-------------|-----------|--------|
-| `TESTNET_ENVIRONMENT` | `TESTNET` | `NIGHTLY` | `NIGHTLY` | `PRODUCTION` | Chain environment. Only `PRODUCTION` reads the `chains` Remote Config key; the others read `chains_v2` (§4.1). Also enables the faucet top-up outside `PRODUCTION`. |
+| `TESTNET_ENVIRONMENT` | `TESTNET` | `NIGHTLY` | `NIGHTLY` | `PRODUCTION` | Chain environment. Only `PRODUCTION` reads the `chains` Remote Config key; the others read `chains_v2` (§4.1). Also picks the Trinity stack the TrUAPI core runs (`TESTNET` previewnet, `NIGHTLY` paseo-next-v2, `PRODUCTION` Polkadot) and enables the faucet top-up outside `PRODUCTION`. |
 | `SAFETY_MODE` | off | off | on | on | On hides the full feature set: arbitrary `.dot` products, browse tab, full tab bar, all chat extensions, linked devices, product settings, personhood, collectibles. |
 | `TAB_BAR_CONNECTIVITY_INDICATOR` | on | on | on | on | Chain-health indicators in the tab bar. The docklet has four item slots, so the browse tab shows only when this is off; it is the switch that brings the browse tab back. |
 | `COINAGE_DEBUG_FEATURES` | on | on | on | off | "Debug features" card under the balance card (breakdown, faucet top-up, log sharing). |
diff --git a/hosts/android/feature/products/impl/src/main/assets/stacks/paseo-next-v2.json b/hosts/android/feature/products/impl/src/main/assets/stacks/paseo-next-v2.json
new file mode 100644
index 0000000000..fe9e406b19
--- /dev/null
+++ b/hosts/android/feature/products/impl/src/main/assets/stacks/paseo-next-v2.json
@@ -0,0 +1 @@
+{"$v":1,"payload":"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","signature":"0x85d877075908dc4059c48561a604e67e8883566ba929b40e1cf93e20a6d99cd5435fb674dd65c1fb30ede47ea156050fe3cce9ba9bc8a3edb775995903600401"}
\ No newline at end of file
diff --git a/hosts/android/feature/products/impl/src/main/assets/stacks/polkadot.json b/hosts/android/feature/products/impl/src/main/assets/stacks/polkadot.json
new file mode 100644
index 0000000000..33ab297446
--- /dev/null
+++ b/hosts/android/feature/products/impl/src/main/assets/stacks/polkadot.json
@@ -0,0 +1 @@
+{"$v":1,"payload":"{
  "$v": 1,
  "assets": [
    {
      "chain": "AssetHub",
      "id": 7873,
      "pallet": "Assets",
      "role": "payment"
    }
  ],
  "chains": [
    {
      "fullSpec": {
        "sha256": "0xd9feae186d0cb776d04372946d7a145efa18fdba7b283733fa655773af426457",
        "url": "https://raw.githubusercontent.com/paritytech/polkadot-sdk/9d0dc6e8fbb13174663abb4001e369f2a69f357a/polkadot/node/service/chain-specs/polkadot.json"
      },
      "genesisHash": "0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
      "lightSpec": {
        "sha256": "0xab15c67e9d30714ab71cd7fc5ab53b06e4fe854bb118d62f65f7a1b9b8d1a375",
        "url": "https://stack.api.pcf.network/chainspecs/polkadot.ab15c67e9d30.smol.json"
      },
      "role": "Relay",
      "rpc": [
        "wss://rpc.polkadot.io",
        "wss://polkadot-rpc.n.dwellir.com",
        "wss://polkadot-rpc.publicnode.com",
        "wss://polkadot.api.onfinality.io/public-ws",
        "wss://polkadot.gatotech.network",
        "wss://rpc-polkadot.helixstreet.io",
        "wss://rpc-polkadot.luckyfriday.io",
        "wss://rpc-polkadot.stakeworld.io",
        "wss://rpc.interweb-it.com/polkadot"
      ]
    },
    {
      "fullSpec": {
        "sha256": "0x38d099cc33434911718b1533b0b5df346d2058652110630b5364de4cf7666e36",
        "url": "https://raw.githubusercontent.com/paritytech/polkadot-sdk/9d0dc6e8fbb13174663abb4001e369f2a69f357a/cumulus/parachains/chain-specs/asset-hub-polkadot.json"
      },
      "genesisHash": "0x68d56f15f85d3136970ec16946040bc1752654e906147f7e43e9d539d7c3de2f",
      "lightSpec": {
        "sha256": "0xd651325f7db3b4164a83185960d092962dec16a7bf28f7d09abb2fc42c3d658f",
        "url": "https://stack.api.pcf.network/chainspecs/asset-hub-polkadot.d651325f7db3.smol.json"
      },
      "paraId": 1000,
      "role": "AssetHub",
      "rpc": [
        "wss://asset-hub-rpc-mercury.api.pcf.network",
        "wss://asset-hub-rpc-venus.api.pcf.network",
        "wss://polkadot-asset-hub-rpc.polkadot.io",
        "wss://asset-hub-polkadot-rpc.n.dwellir.com",
        "wss://asset-hub-polkadot.gatotech.network",
        "wss://rpc-asset-hub-polkadot.helixstreet.io",
        "wss://rpc-asset-hub-polkadot.luckyfriday.io",
        "wss://rpc-asset-hub-polkadot.stakeworld.io",
        "wss://statemint.api.onfinality.io/public-ws"
      ]
    },
    {
      "fullSpec": {
        "sha256": "0xc90303ad2a4495424765b6d6c87b98b9286c7b32096ecc721fe37677b4267d00",
        "url": "https://raw.githubusercontent.com/paritytech/polkadot-sdk/9d0dc6e8fbb13174663abb4001e369f2a69f357a/cumulus/parachains/chain-specs/people-polkadot.json"
      },
      "genesisHash": "0x67fa177a097bfa18f77ea95ab56e9bcdfeb0e5b8a40e46298bb93e16b6fc5008",
      "lightSpec": {
        "sha256": "0x76eac24447bf921936656d0c01192679e89a04a7afd15e251f48baadb70f2ce6",
        "url": "https://stack.api.pcf.network/chainspecs/people-polkadot.76eac24447bf.smol.json"
      },
      "paraId": 1004,
      "role": "People",
      "rpc": [
        "wss://people-rpc-earth.api.pcf.network",
        "wss://people-rpc-mars.api.pcf.network",
        "wss://polkadot-people-rpc.polkadot.io",
        "wss://people-polkadot-rpc.n.dwellir.com",
        "wss://rpc-people-polkadot.luckyfriday.io",
        "wss://rpc-people-polkadot.stakeworld.io"
      ],
      "statementStore": true
    },
    {
      "fullSpec": {
        "sha256": "0xe725dfc6b096fa98f24d0a8d6a8d28ba15db2740f9c9f3f85897112cd8259c25",
        "url": "https://stack.api.pcf.network/chainspecs/bulletin-polkadot.e725dfc6b096.raw.json"
      },
      "genesisHash": "0x2761c95259d59e55ae3daf756c1413b46e45a5a2987299f8ef8e5d8e4776cbc4",
      "lightSpec": {
        "sha256": "0xb3239b829231a8dda1048e06d9c8cc302c455db55e91d6eba218230c862f6e5e",
        "url": "https://stack.api.pcf.network/chainspecs/bulletin-polkadot.b3239b829231.smol.json"
      },
      "paraId": 1010,
      "role": "Bulletin",
      "rpc": [
        "wss://bulletin-rpc-jupiter.api.pcf.network",
        "wss://bulletin-rpc-saturn.api.pcf.network",
        "wss://bulletin-rpc.polkadot.io",
        "wss://rpc-bulletin.luckyfriday.io",
        "wss://rpc.interweb-it.com/bulletin-polkadot"
      ]
    }
  ],
  "coinage": {
    "chain": "People",
    "instance": 0
  },
  "contracts": {
    "accountDataStore": "0x146a90b89ed24dcaa9c4048269a7b57a3b93cf80"
  },
  "dotns": {
    "contentResolver": "0xf460c6406217e62a0d2717cd45d6385fe5832001",
    "controller": "0x76c19abe11404e43445670f13173afa60bed53f8",
    "costModel": "0xc6ef04dcd0f7d4f8e6d918d8101ec5f9d5a16198",
    "create3Factory": "0x79718ea8c9517447fc96229dcbd3f2fd9ee8d2c2",
    "multicall3": "0x7ba14c2dd9a8d95d7e6694b96763f0886d99309c",
    "nameEscrow": "0xd76134522faf788f8df110e1166441e4468d2c81",
    "nameWhitelist": "0xec2f4c007b51c35defa96bf654f357fc850362ab",
    "popController": "0xa06d1cb1e3fedff7b5dfa779b4cc61703f8a46a1",
    "popLens": "0xe98fe2437eec5e867b232409d29dae61a0255c31",
    "popResolver": "0x41a56012461efa8e3f62b4106240a9c2758d99d8",
    "popRules": "0x088c8de68fd3c199e64c65153b3b628760413bd7",
    "protocolRegistry": "0x371693beead209fbb94e2fe5a6e43c3c15fe376f",
    "registrar": "0x37442d086e282f7c497fc4ffe00d0a06b84a1f81",
    "registry": "0x1ae9a72865ec7092fc7036892f3349748d31a71e",
    "resolver": "0x62060d4ebb7c375d151e21fdcaed0b9a71727975",
    "reverseResolver": "0x194bc50ed31c0903e5761b37bc85fb7371a86e78",
    "storeFactory": "0xfe75036170a5c800a939df476d756c3d8ff56a8a"
  },
  "generation": "0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
  "id": "polkadot",
  "name": "Polkadot",
  "network": "polkadot",
  "sequence": 1793529299,
  "services": [
    {
      "kind": "dub",
      "urls": [
        "https://polkadot-app.api.pcf.network/"
      ]
    },
    {
      "kind": "turn",
      "urls": [
        "https://polkadot-app.api.pcf.network/"
      ]
    },
    {
      "kind": "stun",
      "urls": [
        "stun:turn.api.pcf.network:3478"
      ]
    },
    {
      "kind": "ipfs-gateway",
      "urls": [
        "https://ipfs.api.pcf.network/ipfs/"
      ]
    },
    {
      "kind": "hop",
      "urls": [
        "wss://bulletin-rpc-jupiter.api.pcf.network"
      ]
    },
    {
      "chainId": 420420419,
      "kind": "eth-rpc",
      "urls": [
        "https://eth-rpc.polkadot.io"
      ]
    },
    {
      "kind": "web-gateway",
      "urls": [
        "https://dot.li/"
      ]
    },
    {
      "kind": "evm-explorer",
      "urls": [
        "https://blockscout.polkadot.io/"
      ]
    }
  ],
  "tld": "dot",
  "validUntil": 1801305299
}
","signature":"0x65820b1bf166da769b20ce44a80e22051b12ad13b30fa851f25dba26002cf2ada8a945b2f7a9cefda3a148f011dd14b494e0caa6d22ee6dbda327433c4a09c08"}
\ No newline at end of file
diff --git a/hosts/android/feature/products/impl/src/main/assets/stacks/previewnet.json b/hosts/android/feature/products/impl/src/main/assets/stacks/previewnet.json
new file mode 100644
index 0000000000..372a3fc6e5
--- /dev/null
+++ b/hosts/android/feature/products/impl/src/main/assets/stacks/previewnet.json
@@ -0,0 +1 @@
+{"$v":1,"payload":"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","signature":"0x850dffc9be8cb6f5168a6ff25c0ceef282f08631d46ea645aeb14a07de96f9c6533a5584f608f4a7728b6172a70ea5e5ef764f72b469cd317a67d317ed652d0d"}
\ No newline at end of file
diff --git a/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/ProductTrUAPIHostBridge.kt b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/ProductTrUAPIHostBridge.kt
index ae8cc14eeb..bb8f5918fd 100644
--- a/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/ProductTrUAPIHostBridge.kt
+++ b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/ProductTrUAPIHostBridge.kt
@@ -43,7 +43,6 @@ import timber.log.Timber
 import uniffi.truapi.AuthState
 import uniffi.truapi.ExpandedCardFaceOutcome
 import uniffi.truapi.ExtensionVersionMap
-import uniffi.truapi.HostChainSet
 import uniffi.truapi.HostDevicePermissionRequest
 import uniffi.truapi.HostFeatureSupportedRequest
 import uniffi.truapi.HostNavigateToException
@@ -240,8 +239,6 @@ class ProductTrUAPIHostBridge @AssistedInject constructor(
 
         override fun currentTheme(): HostThemeSubscribeItem = cachedTheme.get()
 
-        override fun supportedChains(): HostChainSet = cachedChains.get().advertised
-
         override suspend fun transactionExtensionVersions(): ExtensionVersionMap =
             extensionVersions.resolve().getOrElse { throw it }
 
diff --git a/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainDirectory.kt b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainDirectory.kt
index 9d49681c4f..9ea84472b3 100644
--- a/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainDirectory.kt
+++ b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainDirectory.kt
@@ -1,78 +1,34 @@
 package io.paritytech.polkadotapp.feature_products_impl.domain.truapi
 
 import io.paritytech.polkadotapp.chains.multiNetwork.ChainRegistry
-import io.paritytech.polkadotapp.chains.multiNetwork.KnownChains
-import io.paritytech.polkadotapp.chains.multiNetwork.chain.model.Chain
 import io.paritytech.polkadotapp.chains.multiNetwork.chain.model.GenesisHash
-import io.paritytech.polkadotapp.common.data.network.TestnetEnvironment
 import io.paritytech.polkadotapp.feature_products_impl.domain.hostApi.HostApiInteractor
 import kotlinx.coroutines.flow.first
-import uniffi.truapi.ChainIdentifier
-import uniffi.truapi.HostChainEntry
-import uniffi.truapi.HostChainSet
 import javax.inject.Inject
 
 /**
- * What chains the host serves and how to reach them. RFC-0026 requires the two
- * to agree, and the core asks for them on a thread where it cannot block, so
- * both are resolved once per session.
+ * How to reach the chains the host carries. The core asks on a thread where it
+ * cannot block, so the endpoints are resolved once per session.
  */
 class TrUAPIChainDirectory @Inject constructor(
     private val chainRegistry: ChainRegistry,
     private val hostApiInteractor: HostApiInteractor,
-    private val knownChains: KnownChains,
-    private val environment: TestnetEnvironment,
 ) {
     suspend fun resolve(): TrUAPIChains {
-        // One read backs both halves; two reads let them disagree.
         val chains = runCatching { chainRegistry.currentChains.first() }.getOrDefault(emptyList())
 
-        // Every registered chain, not just the advertised roles: `chainConnect`
-        // and `featureSupported` both answer from this map, so a product can
-        // reach a chain the host carries without it holding a named role.
+        // Every registered chain: `chainConnect` and `featureSupported` both
+        // answer from this map, so a product can reach any chain the host carries.
         val endpoints = chains.associate { chain ->
             chain.genesisHash.hexKey() to
                 hostApiInteractor.chainNodes(chain.genesisHash).getOrDefault(emptyList())
         }
 
-        return TrUAPIChains(
-            advertised = advertised(chains, endpoints),
-            endpoints = endpoints,
-        )
-    }
-
-    private fun advertised(chains: List<Chain>, endpoints: Map<String, List<String>>): HostChainSet {
-        val byId = chains.associateBy { it.id }
-        // The relay is AssetHub's parent rather than a KnownChains slot.
-        val relayId = byId[knownChains.assetHub]?.parentId
-        val roles = listOfNotNull(
-            relayId?.let { ChainIdentifier.RELAY to it },
-            ChainIdentifier.ASSET_HUB to knownChains.assetHub,
-            ChainIdentifier.PEOPLE to knownChains.people,
-            ChainIdentifier.BULLETIN to knownChains.bulletIn,
-        ).mapNotNull { (identifier, chainId) ->
-            byId[chainId]?.let { identifier to it.genesisHash }
-        }
-
-        return advertisedFrom(roles, endpoints, environment.ecosystem())
+        return TrUAPIChains(endpoints = endpoints)
     }
 }
 
-/** Never advertise a chain `chainConnect` cannot dial: no endpoints, no entry. */
-internal fun advertisedFrom(
-    roles: List<Pair<ChainIdentifier, GenesisHash>>,
-    endpoints: Map<String, List<String>>,
-    network: String,
-): HostChainSet = HostChainSet(
-    network = network,
-    chains = roles.mapNotNull { (identifier, genesisHash) ->
-        if (endpoints[genesisHash.hexKey()].isNullOrEmpty()) null
-        else HostChainEntry(identifier, genesisHash.value)
-    },
-)
-
 class TrUAPIChains(
-    val advertised: HostChainSet,
     /** Genesis hash, lower-case hex, to its JSON-RPC endpoints in preference order. */
     val endpoints: Map<String, List<String>>,
 ) {
@@ -83,23 +39,10 @@ class TrUAPIChains(
     fun canDial(genesisHash: ByteArray): Boolean = !endpoints[genesisHash.hexKey()].isNullOrEmpty()
 }
 
-internal val EMPTY_CHAINS = TrUAPIChains(
-    advertised = HostChainSet(network = "", chains = emptyList()),
-    endpoints = emptyMap(),
-)
+internal val EMPTY_CHAINS = TrUAPIChains(endpoints = emptyMap())
 
 @OptIn(ExperimentalStdlibApi::class)
 internal fun GenesisHash.hexKey(): String = value.toHexString()
 
 @OptIn(ExperimentalStdlibApi::class)
 internal fun ByteArray.hexKey(): String = toHexString()
-
-/**
- * RFC-0026 `network` is an open ecosystem string, not a mainnet/testnet flag.
- * Both app testnets are Paseo-based and the core itself reports "paseo" for
- * them; split these apart if a product ever needs to tell nightly from preview.
- */
-private fun TestnetEnvironment.ecosystem(): String = when (this) {
-    TestnetEnvironment.PRODUCTION -> "polkadot"
-    TestnetEnvironment.NIGHTLY, TestnetEnvironment.TESTNET -> "paseo"
-}
diff --git a/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProvider.kt b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProvider.kt
index 02f17a2fc3..3810d77d15 100644
--- a/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProvider.kt
+++ b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProvider.kt
@@ -8,9 +8,8 @@ import io.parity.truapi.HostCoreStorage
 import io.parity.truapi.HostStorage
 import io.parity.truapi.TrUAPIHostRuntime
 import io.parity.truapi.WebSocketChainProvider
-import io.paritytech.polkadotapp.chains.multiNetwork.ChainRegistry
-import io.paritytech.polkadotapp.chains.multiNetwork.KnownChains
 import io.paritytech.polkadotapp.common.data.app.AppLifecycleState
+import io.paritytech.polkadotapp.common.data.network.TestnetEnvironment
 import io.paritytech.polkadotapp.common.data.storage.preferences.encrypted.EncryptedPreferences
 import io.paritytech.polkadotapp.common.presentation.AppLifecycleObserver
 import io.paritytech.polkadotapp.common.utils.CoroutineDispatchers
@@ -43,7 +42,6 @@ import okhttp3.OkHttpClient
 import timber.log.Timber
 import uniffi.truapi.AuthState
 import uniffi.truapi.ExtensionVersionMap
-import uniffi.truapi.HostChainSet
 import uniffi.truapi.HostDevicePermissionRequest
 import uniffi.truapi.HostFeatureSupportedRequest
 import uniffi.truapi.HostLocalStorageReadException
@@ -67,8 +65,7 @@ import javax.inject.Singleton
 @Singleton
 class TrUAPIHostRuntimeProvider @Inject constructor(
     @param:ApplicationContext private val context: Context,
-    private val chainRegistry: ChainRegistry,
-    private val knownChains: KnownChains,
+    private val environment: TestnetEnvironment,
     private val chainDirectory: TrUAPIChainDirectory,
     private val localSessionSource: TrUAPILocalSessionSource,
     private val accountRepository: AccountRepository,
@@ -145,21 +142,17 @@ class TrUAPIHostRuntimeProvider @Inject constructor(
     }
 
     private suspend fun buildRuntimeConfig(): HostRuntimeConfig {
-        val peopleGenesis = chainRegistry.getChain(knownChains.people).genesisHash.value
-        val bulletinGenesis = chainRegistry.getChain(knownChains.bulletIn).genesisHash.value
-        val assetHubGenesis = chainRegistry.getChain(knownChains.assetHub).genesisHash.value
         // Booting without a session is the pre-session behaviour: products load
         // and every signing call fails. Worth degrading to rather than refusing
         // every product outright.
         val localSession = localSessionSource.resolve()
             .logFailure("TrUAPI local session unavailable; booting the host runtime without one")
             .getOrNull()
-        // The core derives the wallet's reserved identities under this TLD, so it has
-        // to be the one the app's own built-in accounts derive from. A wrong suffix
-        // mints key material that belongs to no network, so this takes the one an
-        // earlier run read from the chain, else reads it, and fails the boot when
-        // neither answers. A saved suffix is not a guess: a build has one network.
-        // Failing releases the memoised boot so the next caller tries again.
+        // The pinned cards are backed by products named under this TLD, so it has to
+        // be the network's own. This takes the one an earlier run read from the chain,
+        // else reads it, and fails the boot when neither answers. A saved suffix is not
+        // a guess: a build has one network. Failing releases the memoised boot so the
+        // next caller tries again.
         val tld = dotNsTldProvider.currentTldOrNull()
             ?: withTimeoutOrNull(TLD_RESOLVE_TIMEOUT_MS) { dotNsTldProvider.getTldRetrying() }
             ?: error("dotNS TLD unresolved after ${TLD_RESOLVE_TIMEOUT_MS}ms")
@@ -167,10 +160,7 @@ class TrUAPIHostRuntimeProvider @Inject constructor(
         return HostRuntimeConfig(
             hostName = HOST_NAME,
             hostVersion = hostVersion(),
-            peopleChainGenesisHash = peopleGenesis,
-            bulletinChainGenesisHash = bulletinGenesis,
-            assetHubChainGenesisHash = assetHubGenesis,
-            networkSuffix = tld.value,
+            stack = TrUAPIStack.of(environment).bundled(context),
             localSessionSecret = localSession?.secret,
             localSessionLiteUsername = localSession?.liteUsername,
             databaseDirectory = context.noBackupFilesDir.resolve(DATABASE_DIRECTORY).apply { mkdirs() }.absolutePath,
@@ -283,8 +273,6 @@ class TrUAPIHostRuntimeProvider @Inject constructor(
                 is HostFeatureSupportedRequest.Chain -> cachedChains.get().canDial(request.genesisHash)
             }
 
-        override fun supportedChains(): HostChainSet = cachedChains.get().advertised
-
         override suspend fun transactionExtensionVersions(): ExtensionVersionMap =
             extensionVersions.resolve().getOrElse { throw it }
 
diff --git a/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIStack.kt b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIStack.kt
new file mode 100644
index 0000000000..1d91a26217
--- /dev/null
+++ b/hosts/android/feature/products/impl/src/main/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIStack.kt
@@ -0,0 +1,50 @@
+package io.paritytech.polkadotapp.feature_products_impl.domain.truapi
+
+import android.content.Context
+import io.paritytech.polkadotapp.common.data.network.TestnetEnvironment
+import uniffi.truapi.BundledStack
+
+/**
+ * The Trinity stacks the app ships, which the core takes every chain it uses from. Each [asset] is
+ * the signed descriptor as served and only verifies under the key in its own [pointer], so the two
+ * are refreshed together.
+ */
+enum class TrUAPIStack(
+    private val pointer: String,
+    private val asset: String,
+    // The core refuses Polkadot's genesis hashes and `dot` TLD from any stack without this.
+    private val allowsReservedValues: Boolean,
+) {
+    PREVIEWNET(
+        pointer = "polkadotapp://stack?key=0x4d43362f03d5511632a210632d1fb7760b5a663580f12ffca34619f79357e239" +
+            "&url=https%3A%2F%2Fpreviewnet.substrate.dev%2F.well-known%2Ftrinity-stack.json",
+        asset = "stacks/previewnet.json",
+        allowsReservedValues = false,
+    ),
+    PASEO_NEXT_V2(
+        pointer = "polkadotapp://stack?key=0x2b89d8ca74aa2e11ab55f5af1168cd6929b88d1998aecd979b42cfc1078d5377" +
+            "&url=https%3A%2F%2Fstack-paseo-next.parity-testnet.parity.io%2F.well-known%2Ftrinity-stack.json",
+        asset = "stacks/paseo-next-v2.json",
+        allowsReservedValues = false,
+    ),
+    POLKADOT(
+        pointer = "polkadotapp://stack?key=0xdcddb708759dade2e3850368ce0add2072f424ba53f1a2128f3339d646cffe28" +
+            "&url=https%3A%2F%2Fstack.api.pcf.network%2F.well-known%2Ftrinity-stack.json",
+        asset = "stacks/polkadot.json",
+        allowsReservedValues = true,
+    );
+
+    fun bundled(context: Context): BundledStack = BundledStack(
+        pointer = pointer,
+        descriptor = context.assets.open(asset).use { it.readBytes() },
+        allowsReservedValues = allowsReservedValues,
+    )
+
+    companion object {
+        fun of(environment: TestnetEnvironment): TrUAPIStack = when (environment) {
+            TestnetEnvironment.TESTNET -> PREVIEWNET
+            TestnetEnvironment.NIGHTLY -> PASEO_NEXT_V2
+            TestnetEnvironment.PRODUCTION -> POLKADOT
+        }
+    }
+}
diff --git a/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainAgreementTest.kt b/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainAgreementTest.kt
index 0ecce68e75..8353caf5bb 100644
--- a/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainAgreementTest.kt
+++ b/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIChainAgreementTest.kt
@@ -1,64 +1,29 @@
 package io.paritytech.polkadotapp.feature_products_impl.domain.truapi
 
 import io.paritytech.polkadotapp.common.domain.model.toDataByteArray
-import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
-import uniffi.truapi.ChainIdentifier
 
-/** RFC-0026 requires the advertised set and the dialable set to agree. */
+/** `featureSupported(Chain)` must not promise a chain `chainConnect` refuses to dial. */
 class TrUAPIChainAgreementTest {
     private val relay = genesis(1)
     private val assetHub = genesis(2)
 
     @Test
-    fun `a role with no endpoints is not advertised`() {
-        val set = advertisedFrom(
-            roles = listOf(ChainIdentifier.RELAY to relay, ChainIdentifier.ASSET_HUB to assetHub),
-            endpoints = mapOf(relay.hexKey() to listOf("wss://relay.example")),
-            network = "polkadot",
-        )
+    fun `a chain with endpoints is dialable`() {
+        val chains = TrUAPIChains(endpoints = mapOf(relay.hexKey() to listOf("wss://relay.example")))
 
-        assertEquals(listOf(ChainIdentifier.RELAY), set.chains.map { it.identifier })
-    }
-
-    @Test
-    fun `every advertised chain is dialable`() {
-        val endpoints = mapOf(relay.hexKey() to listOf("wss://relay.example"))
-        val chains = TrUAPIChains(
-            advertised = advertisedFrom(
-                roles = listOf(ChainIdentifier.RELAY to relay, ChainIdentifier.ASSET_HUB to assetHub),
-                endpoints = endpoints,
-                network = "polkadot",
-            ),
-            endpoints = endpoints,
-        )
-
-        assertTrue(chains.advertised.chains.all { chains.canDial(it.genesisHash) })
+        assertTrue(chains.canDial(relay.value))
     }
 
     @Test
     fun `a chain with no endpoints is not dialable`() {
-        val chains = TrUAPIChains(
-            advertised = advertisedFrom(emptyList(), emptyMap(), network = "polkadot"),
-            endpoints = mapOf(relay.hexKey() to emptyList()),
-        )
+        val chains = TrUAPIChains(endpoints = mapOf(relay.hexKey() to emptyList()))
 
         assertFalse(chains.canDial(relay.value))
         assertFalse(chains.canDial(assetHub.value))
     }
 
-    @Test
-    fun `an empty registry advertises nothing`() {
-        val set = advertisedFrom(
-            roles = listOf(ChainIdentifier.RELAY to relay),
-            endpoints = emptyMap(),
-            network = "polkadot",
-        )
-
-        assertTrue(set.chains.isEmpty())
-    }
-
     private fun genesis(seed: Byte) = ByteArray(32) { seed }.toDataByteArray()
 }
diff --git a/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProviderTest.kt b/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProviderTest.kt
index 849a353c7a..204358d904 100644
--- a/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProviderTest.kt
+++ b/hosts/android/feature/products/impl/src/test/java/io/paritytech/polkadotapp/feature_products_impl/domain/truapi/TrUAPIHostRuntimeProviderTest.kt
@@ -8,9 +8,10 @@ import io.mockk.mockk
 import io.mockk.mockkObject
 import io.mockk.slot
 import io.mockk.unmockkObject
-import io.paritytech.polkadotapp.chains.multiNetwork.KnownChains
+import io.paritytech.polkadotapp.common.data.network.TestnetEnvironment
 import io.paritytech.polkadotapp.feature_dotns_api.domain.DotNsTld
 import io.paritytech.polkadotapp.feature_products_impl.domain.pocket.FakePinnedPocketCards
+import io.paritytech.polkadotapp.feature_products_impl.domain.pocket.PinnedPocketCards
 import io.paritytech.polkadotapp.feature_products_impl.domain.pocket.personhoodProduct
 import io.paritytech.polkadotapp.feature_products_impl.domain.pocket.pinnedCard
 import io.paritytech.polkadotapp.test_shared.testDispatchers
@@ -18,15 +19,21 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.emptyFlow
 import kotlinx.coroutines.test.TestScope
 import kotlinx.coroutines.test.runTest
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
 import org.junit.After
 import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
 import org.junit.rules.TemporaryFolder
+import uniffi.truapi.BundledStack
 import uniffi.truapi.HostRuntimeConfig
 import uniffi.truapi.NativeTrUApiHostRuntime
 import uniffi.truapi.PinnedPocketCard
+import java.io.File
+import java.util.Base64
 
 class TrUAPIHostRuntimeProviderTest {
     @get:Rule
@@ -34,6 +41,7 @@ class TrUAPIHostRuntimeProviderTest {
 
     private val runtimeConfig = slot<HostRuntimeConfig>()
     private val paseo = requireNotNull(DotNsTld.parse("paseo"))
+    private val pinnedHumanity = listOf(PinnedPocketCard(personhoodProduct, "humanity", "humanity"))
 
     @Before
     fun captureRuntimeConfig() {
@@ -55,28 +63,57 @@ class TrUAPIHostRuntimeProviderTest {
     // name shows no cards offline. The name an earlier run read is the one this build's network has.
     @Test
     fun `boots offline on the network name an earlier run saved`() = runTest {
-        provider(saved = paseo, read = Result.failure(IllegalStateException("offline"))).runtime().getOrThrow()
+        provider(
+            saved = paseo,
+            read = Result.failure(IllegalStateException("offline")),
+            pinnedPocketCards = mockk { every { cards(paseo) } returns pinnedHumanity },
+        ).runtime().getOrThrow()
 
-        assertEquals("paseo", runtimeConfig.captured.networkSuffix)
+        assertEquals(pinnedHumanity, runtimeConfig.captured.pinnedPocketCards)
     }
 
     @Test
     fun `starts the core with the cards the host pins`() = runTest {
         provider().runtime().getOrThrow()
 
+        assertEquals(pinnedHumanity, runtimeConfig.captured.pinnedPocketCards)
+    }
+
+    // The core derives the wallet's identities under the stack's TLD, so a build on another
+    // network's stack mints keys for that network. Only the Polkadot build may use its reserved values.
+    @Test
+    fun `starts the core on the stack its chain environment bundles`() = runTest {
+        val started = TestnetEnvironment.entries.associateWith { environment ->
+            provider(environment = environment).runtime().getOrThrow()
+            runtimeConfig.captured.stack.let { StartedStack(it.tld(), it.allowsReservedValues) }
+        }
+
         assertEquals(
-            listOf(PinnedPocketCard(personhoodProduct, "humanity", "humanity")),
-            runtimeConfig.captured.pinnedPocketCards,
+            mapOf(
+                TestnetEnvironment.TESTNET to StartedStack(tld = "testnet", allowsReservedValues = false),
+                TestnetEnvironment.NIGHTLY to StartedStack(tld = "paseo", allowsReservedValues = false),
+                TestnetEnvironment.PRODUCTION to StartedStack(tld = "dot", allowsReservedValues = true),
+            ),
+            started,
         )
     }
 
+    private data class StartedStack(val tld: String, val allowsReservedValues: Boolean)
+
+    private fun BundledStack.tld(): String {
+        val envelope = Json.parseToJsonElement(descriptor.decodeToString()).jsonObject
+        val payload = Base64.getDecoder().decode(envelope.getValue("payload").jsonPrimitive.content)
+        return Json.parseToJsonElement(payload.decodeToString()).jsonObject.getValue("tld").jsonPrimitive.content
+    }
+
     private fun TestScope.provider(
         saved: DotNsTld? = null,
         read: Result<DotNsTld> = Result.success(paseo),
+        environment: TestnetEnvironment = TestnetEnvironment.NIGHTLY,
+        pinnedPocketCards: PinnedPocketCards = FakePinnedPocketCards(listOf(pinnedCard(personhoodProduct, "humanity"))),
     ) = TrUAPIHostRuntimeProvider(
         context = context(),
-        chainRegistry = mockk(relaxed = true),
-        knownChains = KnownChains(people = "people", assetHub = "asset-hub", bulletIn = "bullet-in", hydration = null),
+        environment = environment,
         chainDirectory = mockk(relaxed = true),
         localSessionSource = mockk { coEvery { resolve() } returns Result.failure(IllegalStateException()) },
         accountRepository = mockk { every { walletAccountFlow() } returns emptyFlow() },
@@ -94,7 +131,7 @@ class TrUAPIHostRuntimeProviderTest {
         scannerBridge = mockk(),
         installations = mockk(),
         extensionVersions = mockk(),
-        pinnedPocketCards = FakePinnedPocketCards(listOf(pinnedCard(personhoodProduct, "humanity"))),
+        pinnedPocketCards = pinnedPocketCards,
         workerSupervisor = { mockk(relaxed = true) },
         dispatchers = testDispatchers(),
     )
@@ -106,6 +143,8 @@ class TrUAPIHostRuntimeProviderTest {
             every { packageName } returns "io.parity.polkadotapp"
             every { packageManager.getPackageInfo("io.parity.polkadotapp", 0) } returns packageInfo
             every { noBackupFilesDir } returns tempFolder.root
+            // The copies the app ships, so a stack missing from the assets fails here rather than at launch.
+            every { assets.open(any()) } answers { File("src/main/assets", firstArg<String>()).inputStream() }
         }
     }
 }
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustHostRuntimeBridge.swift b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustHostRuntimeBridge.swift
index 4affb91513..e4c00fba5b 100644
--- a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustHostRuntimeBridge.swift
+++ b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustHostRuntimeBridge.swift
@@ -141,10 +141,6 @@ final class RustHostRuntimeBridge: HostBridge, @unchecked Sendable {
         try encryptedStorage.delete(key: key)
     }
 
-    func supportedChains() throws -> HostChainSet {
-        TrUAPISupportedChains.make(chainRegistry: chainRegistry)
-    }
-
     func transactionExtensionVersions() async throws -> ExtensionVersionMap {
         try TrUAPIExtensionVersions.make(chainRegistry: chainRegistry)
     }
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustProductExecutionBridge.swift b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustProductExecutionBridge.swift
index 5a05454426..8e53c91974 100644
--- a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustProductExecutionBridge.swift
+++ b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/RustProductExecutionBridge.swift
@@ -184,10 +184,6 @@ class RustProductExecutionBridge: HostBridge, @unchecked Sendable {
         }
     }
 
-    func supportedChains() throws -> HostChainSet {
-        TrUAPISupportedChains.make(chainRegistry: dependencies.chainRegistry)
-    }
-
     func transactionExtensionVersions() async throws -> ExtensionVersionMap {
         try TrUAPIExtensionVersions.make(chainRegistry: dependencies.chainRegistry)
     }
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-paseo-next-v2.json b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-paseo-next-v2.json
new file mode 100644
index 0000000000..fe9e406b19
--- /dev/null
+++ b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-paseo-next-v2.json
@@ -0,0 +1 @@
+{"$v":1,"payload":"ewogICIkdiI6IDEsCiAgImFzc2V0cyI6IFsKICAgIHsKICAgICAgImNoYWluIjogIkFzc2V0SHViIiwKICAgICAgImlkIjogNTAwMDA0MTMsCiAgICAgICJwYWxsZXQiOiAiQXNzZXRzIiwKICAgICAgInJvbGUiOiAicGF5bWVudCIKICAgIH0KICBdLAogICJjaGFpbnMiOiBbCiAgICB7CiAgICAgICJmdWxsU3BlYyI6IHsKICAgICAgICAic2hhMjU2IjogIjB4MDVjMjk0OWFiNGIwNDAxNDA0MTY5NzlmOTM2MjBkZWU0ZWJjNjdiMzBhODMwZTkyZDYyZTFjZDc2YTZhOGMyZCIsCiAgICAgICAgInVybCI6ICJodHRwczovL3Jhdy5naXRodWJ1c2VyY29udGVudC5jb20vcGFzZW8tbmV0d29yay9wYXNlby1jaGFpbi1zcGVjcy8zMWE1ZTJjMmRkYTU2OWRhZGRkZWY4MmFjODJjODRmMTRhZjVhYmY1L3Bhc2VvLnJhdy5qc29uIgogICAgICB9LAogICAgICAiZ2VuZXNpc0hhc2giOiAiMHgzNzQwNTdiZTY3YjM1NTE1MWYyNzFmZjcwYzNkYjk4MzA4YzYyYzhhZGM0OGRjNjcyNGI2YTAwOWExYTAxNGZkIiwKICAgICAgImxpZ2h0U3BlYyI6IHsKICAgICAgICAic2hhMjU2IjogIjB4ZjNkZjM4MDY5MTI5NzY3ZDUzMTBmNGIxOWY0NDM0OWNhMTI3YTM1OTQwNjU2OWJiYTRlYTVjMzVhNDg5YTgxZCIsCiAgICAgICAgInVybCI6ICJodHRwczovL3Jhdy5naXRodWJ1c2VyY29udGVudC5jb20vcGFzZW8tbmV0d29yay9wYXNlby1jaGFpbi1zcGVjcy83YjdhZWFkNTc4MWJlMWYxNWM5YmIzZDlkNjVjZDRhNmNmZDUzYjc2L3Bhc2VvLnJhdy5zbW9sLmpzb24iCiAgICAgIH0sCiAgICAgICJyb2xlIjogIlJlbGF5IiwKICAgICAgInJwYyI6IFsKICAgICAgICAid3NzOi8vcGFzZW8tcnBjLm4uZHdlbGxpci5jb20iLAogICAgICAgICJ3c3M6Ly9wYXNlby12Mi5ycGMudHVyYm9mbGFrZXMuaW8iLAogICAgICAgICJ3c3M6Ly9ycGMtcGFzZW8uc3Rha2V3b3JsZC5pbyIsCiAgICAgICAgIndzczovL3JwYy5pbnRlcndlYi1pdC5jb20vcGFzZW8iCiAgICAgIF0KICAgIH0sCiAgICB7CiAgICAgICJmdWxsU3BlYyI6IHsKICAgICAgICAic2hhMjU2IjogIjB4YzJkYmJlM2RhZGRmMzAyZTJjMTI2YThmZmJlMjY4OTdmNGM4ZDcwOTgyNjk3MDU1ZjlkM2M1NzYyNzQ0NjVmYiIsCiAgICAgICAgInVybCI6ICJodHRwczovL3Jhdy5naXRodWJ1c2VyY29udGVudC5jb20vcGFyaXR5dGVjaC9jaGFpbnNwZWNzL2VkMGMwNjhhY2M4NWQ3MzE0MGQxYWE5MzcxNjlhNDg0MDQ3ZmMyNWYvcGFzZW8vcGFyYWNoYWluL2Fzc2V0LWh1Yi1uZXh0L3Jhdy5qc29uIgogICAgICB9LAogICAgICAiZ2VuZXNpc0hhc2giOiAiMHg0MzQ5YjAwZTU0ODk3ZTIxMTk2ZmQzMzEwMTVmYzViZTBmMTRlMTE4YmViMDM3NWVkMmJiMTc5MzczN2JiNTdhIiwKICAgICAgImxpZ2h0U3BlYyI6IHsKICAgICAgICAic2hhMjU2IjogIjB4MzY3NTFjZmU1NWU3MmUxZjlmNWM5Mzc2ZmFhMTY3YTgxODdiMjczN2E4MWE3Y2ExMDhhMjc5MTgyZGJjMzFjZCIsCiAgICAgICAgInVybCI6ICJodHRwczovL3Jhdy5naXRodWJ1c2VyY29udGVudC5jb20vcGFyaXR5dGVjaC9jaGFpbnNwZWNzLzBkNjgzN2FiYTg2OTRmMjQ0N2M0ZDM1YzEyNDg0YWFjNzZmM2Q0N2IvcGFzZW8vcGFyYWNoYWluL2Fzc2V0LWh1Yi1uZXh0L2xpZ2h0Lmpzb24iCiAgICAgIH0sCiAgICAgICJwYXJhSWQiOiAxNTAwLAogICAgICAicm9sZSI6ICJBc3NldEh1YiIsCiAgICAgICJycGMiOiBbCiAgICAgICAgIndzczovL3Bhc2VvLWFzc2V0LWh1Yi1uZXh0LXJwYy5wb2xrYWRvdC5pbyIKICAgICAgXQogICAgfSwKICAgIHsKICAgICAgImZ1bGxTcGVjIjogewogICAgICAgICJzaGEyNTYiOiAiMHgxMTgxNDZkYWQ2Y2UzODNkMTUyMjJmYjcxZWI0MWE2YmZiYTk4YjZmN2M2OWIyM2ExYzJjZTM2YzRkNmJkMzc1IiwKICAgICAgICAidXJsIjogImh0dHBzOi8vcmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbS9wYXJpdHl0ZWNoL2NoYWluc3BlY3MvZWQwYzA2OGFjYzg1ZDczMTQwZDFhYTkzNzE2OWE0ODQwNDdmYzI1Zi9wYXNlby9wYXJhY2hhaW4vcGVvcGxlLW5leHQtc3lzdGVtL3Jhdy5qc29uIgogICAgICB9LAogICAgICAiZ2VuZXNpc0hhc2giOiAiMHg0YTJiNWI3MzdkZTFkYTU5ZTIwOWIwMDAwYTg3NmVjMmZhMjAwMzVkYzM0ZmQyOTJhODQ4ZGEzMmQyNTVhZDQ4IiwKICAgICAgImxpZ2h0U3BlYyI6IHsKICAgICAgICAic2hhMjU2IjogIjB4MTQ2ZDg2YzVjNGZkZjY3OWE4YTQ4Y2FlNmNmYTAyNTY1NGMzMmU4ZWQyMGFjMzkxOGY2YzdiOGExOGE5MTEzYiIsCiAgICAgICAgInVybCI6ICJodHRwczovL3Jhdy5naXRodWJ1c2VyY29udGVudC5jb20vcGFyaXR5dGVjaC9jaGFpbnNwZWNzLzBkNjgzN2FiYTg2OTRmMjQ0N2M0ZDM1YzEyNDg0YWFjNzZmM2Q0N2IvcGFzZW8vcGFyYWNoYWluL3Blb3BsZS1uZXh0LXN5c3RlbS9saWdodC5qc29uIgogICAgICB9LAogICAgICAicGFyYUlkIjogMTUwMiwKICAgICAgInJvbGUiOiAiUGVvcGxlIiwKICAgICAgInJwYyI6IFsKICAgICAgICAid3NzOi8vcGFzZW8tcGVvcGxlLW5leHQtc3lzdGVtLXJwYy5wb2xrYWRvdC5pbyIKICAgICAgXSwKICAgICAgInN0YXRlbWVudFN0b3JlIjogdHJ1ZQogICAgfSwKICAgIHsKICAgICAgImZ1bGxTcGVjIjogewogICAgICAgICJzaGEyNTYiOiAiMHhjZDBiNDI1ZTY1Y2Y0M2MwM2E3ZTZlZTlhMjllNDBjZDFiYThhMTA2YWE5ZTUyYWRmMTBhNTIxNGYwYzU5YWY3IiwKICAgICAgICAidXJsIjogImh0dHBzOi8vcmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbS9wYXJpdHl0ZWNoL2NoYWluc3BlY3MvODlkODk4MmIzNzNiODY5MjBlMDI3OGYwMDYwZmEwNWZkNmU4ZjM0NC9wYXNlby9wYXJhY2hhaW4vYnVsbGV0aW4tbmV4dC9yYXcuanNvbiIKICAgICAgfSwKICAgICAgImdlbmVzaXNIYXNoIjogIjB4OGNmZTY3MTdkYzRiZWNmZGEyZTEzYzQ4OGExZTIwNjFmZjJkZmVlOTZlN2QwMzExNTdmNzJkMzY3MTZjMGEyMiIsCiAgICAgICJsaWdodFNwZWMiOiB7CiAgICAgICAgInNoYTI1NiI6ICIweDAwYWMwMzY2N2M0NGZiMjY2NThjN2M4ZTYxZTlhNWI5ZWYxNDVkNTEzZTY0ZjkyOTA0Mjc5YzBjZDQwNjJjOWQiLAogICAgICAgICJ1cmwiOiAiaHR0cHM6Ly9yYXcuZ2l0aHVidXNlcmNvbnRlbnQuY29tL3Bhcml0eXRlY2gvY2hhaW5zcGVjcy8wZDY4MzdhYmE4Njk0ZjI0NDdjNGQzNWMxMjQ4NGFhYzc2ZjNkNDdiL3Bhc2VvL3BhcmFjaGFpbi9idWxsZXRpbi1uZXh0L2xpZ2h0Lmpzb24iCiAgICAgIH0sCiAgICAgICJwYXJhSWQiOiAxNTAxLAogICAgICAicm9sZSI6ICJCdWxsZXRpbiIsCiAgICAgICJycGMiOiBbCiAgICAgICAgIndzczovL3Bhc2VvLWJ1bGxldGluLW5leHQtcnBjLnBvbGthZG90LmlvIgogICAgICBdCiAgICB9CiAgXSwKICAiY29pbmFnZSI6IHsKICAgICJjaGFpbiI6ICJQZW9wbGUiLAogICAgImluc3RhbmNlIjogMAogIH0sCiAgImRvdG5zIjogewogICAgImNvbnRlbnRSZXNvbHZlciI6ICIweDdmNzRkN2NkNTBmNWE4MzQyNzBlMmFkMzk1YTAxYjAxODkxYWIzN2QiLAogICAgImNvbnRyb2xsZXIiOiAiMHhiZGFhMDFiZDFiYTY3ZDcwOWYyYjFmZjI4NmRhMGQ4NTQ5NzdlYTMwIiwKICAgICJjb3N0TW9kZWwiOiAiMHg4YmZkMWYwOTU3ZTczNzE2NzMyZTcyNTgwMmYxMzgzMGI1NjgyZGE0IiwKICAgICJjcmVhdGUzRmFjdG9yeSI6ICIweDg1MzNjNzllMDU4YzVhNjQ4OWNhZmVjYTg2ZGM2MDBlMDI5ZDc1ZjUiLAogICAgIm11bHRpY2FsbDMiOiAiMHhiNDQ2ODAwMGFiZDg3ZDNjNTZjYmZiZDE1MzE2MTIyM2Q3YjEwOWU1IiwKICAgICJuYW1lRXNjcm93IjogIjB4NDg4MWFmYjc4ZTdjOTA4Y2FlODE4MTY4YjkyNjIyOWQ5MzM3NjUyMCIsCiAgICAibmFtZVdoaXRlbGlzdCI6ICIweDQyMDE2NmNkNjdjYTAyMzMwOTRlNDkyYTRiYmE2NzA0NWVkN2MzOGMiLAogICAgInBvcENvbnRyb2xsZXIiOiAiMHhjYzkzMjM0ODYwNmNjMWYzMzE4Y2FkZWM1YTVjZDJjYTQ0N2Y4YTRiIiwKICAgICJwb3BHYXRld2F5IjogIjB4YTg4OWNjYTNmYjRiMDdiOThhMTFjYzU0YzEwZjEzZGRhMjBiYzNkYiIsCiAgICAicG9wTGVucyI6ICIweDMwOWM1ZmYyMWY5MDgyYTUzMjExNTAwYzZmMzNjYTJhMjEwMjRhZTQiLAogICAgInBvcFJlc29sdmVyIjogIjB4ZGFjOTg0ODg0ZWNhOGZjNDQwMTFmMWQ2YzQ5YjI3ODI4MzkwYTcyYiIsCiAgICAicG9wUnVsZXMiOiAiMHg3NDdiNDU2YmUwM2FlYzBiNDJiZDg1YzUxNTEzNzMwZmJkNDVkYTMxIiwKICAgICJwcm90b2NvbFJlZ2lzdHJ5IjogIjB4ZDE5ZTNkMGM5N2NmNTAxMTI1YTA0YTk3NDA1ZTNlNjU5MmZhODQ2ZSIsCiAgICAicmVnaXN0cmFyIjogIjB4NGYwNmU4MThiYTNkOTg3NzA0ZmQ5MWNmM2Q4NjhlNGIwMTkxMDZhYiIsCiAgICAicmVnaXN0cnkiOiAiMHhmMzQwNTRmZDc2YmJmODVmMjE2Y2Y5OTA4MjI2ZDVmMGE3MmU1MGNhIiwKICAgICJyZXNvbHZlciI6ICIweGJkMTE2NWU1NDlkZjk2ZjA4M2MwYTE2ZjYxNTkwOTI3YmMxODcwMDkiLAogICAgInJldmVyc2VSZXNvbHZlciI6ICIweGVlMzg4M2Q3ZWI2MGVlOWJjZDdmM2JjZDhmMmYwNTMwMmE5Y2MwMzUiLAogICAgInN0b3JlRmFjdG9yeSI6ICIweDk5NjA1YTkyNmZjYjQwYWI1MjBmNjU5YzY1MDVlNWZmODYyNzcxZjYiCiAgfSwKICAiZ2VuZXJhdGlvbiI6ICIweDZlYmJjYzgxMTYwZDdkZjI3NTMyYThiNmFkYWE0MmMwZGFjNDMyZWFjNjExYjIwZGZhM2YwMmQ5ZTA4NjhlMWMiLAogICJpZCI6ICJwYXNlby1uZXh0LXYyIiwKICAibmFtZSI6ICJQYXNlbyBOZXh0IHYyIiwKICAibmV0d29yayI6ICJwYXNlbyIsCiAgInNlcXVlbmNlIjogMTc5MzYxNTI4NywKICAic2VydmljZXMiOiBbCiAgICB7CiAgICAgICJraW5kIjogImR1YiIsCiAgICAgICJ1cmxzIjogWwogICAgICAgICJodHRwczovL2lkZW50aXR5LmRvdHNwYXJrLmFwcC8iCiAgICAgIF0KICAgIH0sCiAgICB7CiAgICAgICJraW5kIjogInR1cm4iLAogICAgICAidXJscyI6IFsKICAgICAgICAiaHR0cHM6Ly9pZGVudGl0eS5kb3RzcGFyay5hcHAvIgogICAgICBdCiAgICB9LAogICAgewogICAgICAia2luZCI6ICJzdHVuIiwKICAgICAgInVybHMiOiBbCiAgICAgICAgInN0dW46c3R1bi5jbG91ZGZsYXJlLmNvbTozNDc4IiwKICAgICAgICAic3R1bjpzdHVuLmNsb3VkZmxhcmUuY29tOjQ0MyIKICAgICAgXQogICAgfSwKICAgIHsKICAgICAgImtpbmQiOiAiaXBmcy1nYXRld2F5IiwKICAgICAgInVybHMiOiBbCiAgICAgICAgImh0dHBzOi8vcGFzZW8tYnVsbGV0aW4tbmV4dC1pcGZzLnBvbGthZG90LmlvL2lwZnMvIgogICAgICBdCiAgICB9LAogICAgewogICAgICAia2luZCI6ICJob3AiLAogICAgICAidXJscyI6IFsKICAgICAgICAid3NzOi8vcGFzZW8taG9wLW5leHQtMC5wb2xrYWRvdC5pbyIsCiAgICAgICAgIndzczovL3Bhc2VvLWhvcC1uZXh0LTEucG9sa2Fkb3QuaW8iCiAgICAgIF0KICAgIH0sCiAgICB7CiAgICAgICJjaGFpbklkIjogNDIwNDIwNDE3LAogICAgICAia2luZCI6ICJldGgtcnBjIiwKICAgICAgInVybHMiOiBbCiAgICAgICAgImh0dHBzOi8vZXRoLXJwYy1wYXNlby1uZXh0LnBvbGthZG90LmlvIgogICAgICBdCiAgICB9LAogICAgewogICAgICAia2luZCI6ICJ3ZWItZ2F0ZXdheSIsCiAgICAgICJ1cmxzIjogWwogICAgICAgICJodHRwczovL3Bhc2VvLmxpLyIKICAgICAgXQogICAgfSwKICAgIHsKICAgICAgImtpbmQiOiAiZXZtLWV4cGxvcmVyIiwKICAgICAgInVybHMiOiBbCiAgICAgICAgImh0dHBzOi8vYmxvY2tzY291dC1wYXNlby1uZXh0LnBvbGthZG90LmlvLyIKICAgICAgXQogICAgfQogIF0sCiAgInRsZCI6ICJwYXNlbyIKfQo=","signature":"0x85d877075908dc4059c48561a604e67e8883566ba929b40e1cf93e20a6d99cd5435fb674dd65c1fb30ede47ea156050fe3cce9ba9bc8a3edb775995903600401"}
\ No newline at end of file
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-polkadot.json b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-polkadot.json
new file mode 100644
index 0000000000..33ab297446
--- /dev/null
+++ b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-polkadot.json
@@ -0,0 +1 @@
+{"$v":1,"payload":"{
  "$v": 1,
  "assets": [
    {
      "chain": "AssetHub",
      "id": 7873,
      "pallet": "Assets",
      "role": "payment"
    }
  ],
  "chains": [
    {
      "fullSpec": {
        "sha256": "0xd9feae186d0cb776d04372946d7a145efa18fdba7b283733fa655773af426457",
        "url": "https://raw.githubusercontent.com/paritytech/polkadot-sdk/9d0dc6e8fbb13174663abb4001e369f2a69f357a/polkadot/node/service/chain-specs/polkadot.json"
      },
      "genesisHash": "0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
      "lightSpec": {
        "sha256": "0xab15c67e9d30714ab71cd7fc5ab53b06e4fe854bb118d62f65f7a1b9b8d1a375",
        "url": "https://stack.api.pcf.network/chainspecs/polkadot.ab15c67e9d30.smol.json"
      },
      "role": "Relay",
      "rpc": [
        "wss://rpc.polkadot.io",
        "wss://polkadot-rpc.n.dwellir.com",
        "wss://polkadot-rpc.publicnode.com",
        "wss://polkadot.api.onfinality.io/public-ws",
        "wss://polkadot.gatotech.network",
        "wss://rpc-polkadot.helixstreet.io",
        "wss://rpc-polkadot.luckyfriday.io",
        "wss://rpc-polkadot.stakeworld.io",
        "wss://rpc.interweb-it.com/polkadot"
      ]
    },
    {
      "fullSpec": {
        "sha256": "0x38d099cc33434911718b1533b0b5df346d2058652110630b5364de4cf7666e36",
        "url": "https://raw.githubusercontent.com/paritytech/polkadot-sdk/9d0dc6e8fbb13174663abb4001e369f2a69f357a/cumulus/parachains/chain-specs/asset-hub-polkadot.json"
      },
      "genesisHash": "0x68d56f15f85d3136970ec16946040bc1752654e906147f7e43e9d539d7c3de2f",
      "lightSpec": {
        "sha256": "0xd651325f7db3b4164a83185960d092962dec16a7bf28f7d09abb2fc42c3d658f",
        "url": "https://stack.api.pcf.network/chainspecs/asset-hub-polkadot.d651325f7db3.smol.json"
      },
      "paraId": 1000,
      "role": "AssetHub",
      "rpc": [
        "wss://asset-hub-rpc-mercury.api.pcf.network",
        "wss://asset-hub-rpc-venus.api.pcf.network",
        "wss://polkadot-asset-hub-rpc.polkadot.io",
        "wss://asset-hub-polkadot-rpc.n.dwellir.com",
        "wss://asset-hub-polkadot.gatotech.network",
        "wss://rpc-asset-hub-polkadot.helixstreet.io",
        "wss://rpc-asset-hub-polkadot.luckyfriday.io",
        "wss://rpc-asset-hub-polkadot.stakeworld.io",
        "wss://statemint.api.onfinality.io/public-ws"
      ]
    },
    {
      "fullSpec": {
        "sha256": "0xc90303ad2a4495424765b6d6c87b98b9286c7b32096ecc721fe37677b4267d00",
        "url": "https://raw.githubusercontent.com/paritytech/polkadot-sdk/9d0dc6e8fbb13174663abb4001e369f2a69f357a/cumulus/parachains/chain-specs/people-polkadot.json"
      },
      "genesisHash": "0x67fa177a097bfa18f77ea95ab56e9bcdfeb0e5b8a40e46298bb93e16b6fc5008",
      "lightSpec": {
        "sha256": "0x76eac24447bf921936656d0c01192679e89a04a7afd15e251f48baadb70f2ce6",
        "url": "https://stack.api.pcf.network/chainspecs/people-polkadot.76eac24447bf.smol.json"
      },
      "paraId": 1004,
      "role": "People",
      "rpc": [
        "wss://people-rpc-earth.api.pcf.network",
        "wss://people-rpc-mars.api.pcf.network",
        "wss://polkadot-people-rpc.polkadot.io",
        "wss://people-polkadot-rpc.n.dwellir.com",
        "wss://rpc-people-polkadot.luckyfriday.io",
        "wss://rpc-people-polkadot.stakeworld.io"
      ],
      "statementStore": true
    },
    {
      "fullSpec": {
        "sha256": "0xe725dfc6b096fa98f24d0a8d6a8d28ba15db2740f9c9f3f85897112cd8259c25",
        "url": "https://stack.api.pcf.network/chainspecs/bulletin-polkadot.e725dfc6b096.raw.json"
      },
      "genesisHash": "0x2761c95259d59e55ae3daf756c1413b46e45a5a2987299f8ef8e5d8e4776cbc4",
      "lightSpec": {
        "sha256": "0xb3239b829231a8dda1048e06d9c8cc302c455db55e91d6eba218230c862f6e5e",
        "url": "https://stack.api.pcf.network/chainspecs/bulletin-polkadot.b3239b829231.smol.json"
      },
      "paraId": 1010,
      "role": "Bulletin",
      "rpc": [
        "wss://bulletin-rpc-jupiter.api.pcf.network",
        "wss://bulletin-rpc-saturn.api.pcf.network",
        "wss://bulletin-rpc.polkadot.io",
        "wss://rpc-bulletin.luckyfriday.io",
        "wss://rpc.interweb-it.com/bulletin-polkadot"
      ]
    }
  ],
  "coinage": {
    "chain": "People",
    "instance": 0
  },
  "contracts": {
    "accountDataStore": "0x146a90b89ed24dcaa9c4048269a7b57a3b93cf80"
  },
  "dotns": {
    "contentResolver": "0xf460c6406217e62a0d2717cd45d6385fe5832001",
    "controller": "0x76c19abe11404e43445670f13173afa60bed53f8",
    "costModel": "0xc6ef04dcd0f7d4f8e6d918d8101ec5f9d5a16198",
    "create3Factory": "0x79718ea8c9517447fc96229dcbd3f2fd9ee8d2c2",
    "multicall3": "0x7ba14c2dd9a8d95d7e6694b96763f0886d99309c",
    "nameEscrow": "0xd76134522faf788f8df110e1166441e4468d2c81",
    "nameWhitelist": "0xec2f4c007b51c35defa96bf654f357fc850362ab",
    "popController": "0xa06d1cb1e3fedff7b5dfa779b4cc61703f8a46a1",
    "popLens": "0xe98fe2437eec5e867b232409d29dae61a0255c31",
    "popResolver": "0x41a56012461efa8e3f62b4106240a9c2758d99d8",
    "popRules": "0x088c8de68fd3c199e64c65153b3b628760413bd7",
    "protocolRegistry": "0x371693beead209fbb94e2fe5a6e43c3c15fe376f",
    "registrar": "0x37442d086e282f7c497fc4ffe00d0a06b84a1f81",
    "registry": "0x1ae9a72865ec7092fc7036892f3349748d31a71e",
    "resolver": "0x62060d4ebb7c375d151e21fdcaed0b9a71727975",
    "reverseResolver": "0x194bc50ed31c0903e5761b37bc85fb7371a86e78",
    "storeFactory": "0xfe75036170a5c800a939df476d756c3d8ff56a8a"
  },
  "generation": "0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
  "id": "polkadot",
  "name": "Polkadot",
  "network": "polkadot",
  "sequence": 1793529299,
  "services": [
    {
      "kind": "dub",
      "urls": [
        "https://polkadot-app.api.pcf.network/"
      ]
    },
    {
      "kind": "turn",
      "urls": [
        "https://polkadot-app.api.pcf.network/"
      ]
    },
    {
      "kind": "stun",
      "urls": [
        "stun:turn.api.pcf.network:3478"
      ]
    },
    {
      "kind": "ipfs-gateway",
      "urls": [
        "https://ipfs.api.pcf.network/ipfs/"
      ]
    },
    {
      "kind": "hop",
      "urls": [
        "wss://bulletin-rpc-jupiter.api.pcf.network"
      ]
    },
    {
      "chainId": 420420419,
      "kind": "eth-rpc",
      "urls": [
        "https://eth-rpc.polkadot.io"
      ]
    },
    {
      "kind": "web-gateway",
      "urls": [
        "https://dot.li/"
      ]
    },
    {
      "kind": "evm-explorer",
      "urls": [
        "https://blockscout.polkadot.io/"
      ]
    }
  ],
  "tld": "dot",
  "validUntil": 1801305299
}
","signature":"0x65820b1bf166da769b20ce44a80e22051b12ad13b30fa851f25dba26002cf2ada8a945b2f7a9cefda3a148f011dd14b494e0caa6d22ee6dbda327433c4a09c08"}
\ No newline at end of file
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-previewnet.json b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-previewnet.json
new file mode 100644
index 0000000000..372a3fc6e5
--- /dev/null
+++ b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/Stacks/trinity-stack-previewnet.json
@@ -0,0 +1 @@
+{"$v":1,"payload":"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","signature":"0x850dffc9be8cb6f5168a6ff25c0ceef282f08631d46ea645aeb14a07de96f9c6533a5584f608f4a7728b6172a70ea5e5ef764f72b469cd317a67d317ed652d0d"}
\ No newline at end of file
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPIBundledStack.swift b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPIBundledStack.swift
new file mode 100644
index 0000000000..b5c6ff46c8
--- /dev/null
+++ b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPIBundledStack.swift
@@ -0,0 +1,68 @@
+import Foundation
+import TrUAPIHost
+
+/// The Trinity stacks the app bundles, and which one each build runs. The core
+/// takes every chain it uses, the network it reports and the TLD the wallet's
+/// reserved identities derive under from the running stack's descriptor.
+///
+/// Each descriptor is a signed copy under `Stacks/`, kept byte for byte as
+/// published. The core verifies it against its link's key when the runtime
+/// starts, so a copy refreshed without its link stops the runtime.
+enum TrUAPIBundledStack {
+    enum Error: Swift.Error, Equatable {
+        case missingDescriptor(resource: String)
+    }
+
+    /// One stack the app bundles: its descriptor resource, the link it was
+    /// published under, and whether it may use Polkadot's genesis hashes and
+    /// the `dot` TLD, which only the mainnet build allows.
+    struct Definition {
+        let descriptorResource: String
+        let pointer: String
+        let allowsReservedValues: Bool
+
+        /// The stack with its descriptor read from `bundle`, as the core takes it.
+        func load(from bundle: Bundle = .main) throws -> BundledStack {
+            guard let url = bundle.url(forResource: descriptorResource, withExtension: "json") else {
+                throw Error.missingDescriptor(resource: descriptorResource)
+            }
+            return try BundledStack(
+                pointer: pointer,
+                descriptor: Data(contentsOf: url),
+                allowsReservedValues: allowsReservedValues
+            )
+        }
+    }
+
+    static let previewnet = Definition(
+        descriptorResource: "trinity-stack-previewnet",
+        pointer: "polkadotapp://stack?key=0x4d43362f03d5511632a210632d1fb7760b5a663580f12ffca34619f79357e239"
+            + "&url=https%3A%2F%2Fpreviewnet.substrate.dev%2F.well-known%2Ftrinity-stack.json",
+        allowsReservedValues: false
+    )
+
+    static let paseoNextV2 = Definition(
+        descriptorResource: "trinity-stack-paseo-next-v2",
+        pointer: "polkadotapp://stack?key=0x2b89d8ca74aa2e11ab55f5af1168cd6929b88d1998aecd979b42cfc1078d5377"
+            + "&url=https%3A%2F%2Fstack-paseo-next.parity-testnet.parity.io%2F.well-known%2Ftrinity-stack.json",
+        allowsReservedValues: false
+    )
+
+    static let polkadot = Definition(
+        descriptorResource: "trinity-stack-polkadot",
+        pointer: "polkadotapp://stack?key=0xdcddb708759dade2e3850368ce0add2072f424ba53f1a2128f3339d646cffe28"
+            + "&url=https%3A%2F%2Fstack.api.pcf.network%2F.well-known%2Ftrinity-stack.json",
+        allowsReservedValues: true
+    )
+
+    /// The stack this build runs.
+    static var current: Definition {
+        #if UNSTABLE
+            previewnet
+        #elseif NIGHTLY || SAFETYNET
+            paseoNextV2
+        #else
+            polkadot
+        #endif
+    }
+}
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPIHostRuntimeProvider.swift b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPIHostRuntimeProvider.swift
index 82eca5e92f..4516887613 100644
--- a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPIHostRuntimeProvider.swift
+++ b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPIHostRuntimeProvider.swift
@@ -10,11 +10,6 @@ import SubstrateSdk
 import KeyDerivation
 import Keystore_iOS
 
-/// Runtime configuration error raised while assembling the shared host config.
-enum TrUAPIRuntimeConfigError: Error {
-    case missingGenesisHash(chain: String)
-}
-
 /// Vends the process-wide ``TrUAPIHostRuntime``. Product executions open off
 /// the single shared runtime, so its authentication and core services are
 /// shared across every SPA and chat product.
@@ -35,10 +30,10 @@ protocol TrUAPIHostRuntimeProviding: AnyObject, Sendable {
     func attach(workerManager: any TrUAPIWorkerManaging)
 }
 
-/// Lazily builds one ``TrUAPIHostRuntime`` from host identity + people/bulletin
-/// genesis hashes + the local session secret, activates the local session
-/// once, and caches it. Lazy so startup is not blocked and the runtime is only
-/// assembled once chains are synced and a session secret exists.
+/// Lazily builds one ``TrUAPIHostRuntime`` from host identity + the stack the
+/// build bundles + the local session secret, activates the local session once,
+/// and caches it. Lazy so startup is not blocked and the runtime is only
+/// assembled once a session secret exists.
 final class TrUAPIHostRuntimeProvider: TrUAPIHostRuntimeProviding, @unchecked Sendable {
     private let chainRegistry: ChainRegistryProtocol
     private let entropyManager: RootEntropyManaging
@@ -135,7 +130,6 @@ final class TrUAPIHostRuntimeProvider: TrUAPIHostRuntimeProviding, @unchecked Se
         let secret = try entropyManager.fetchRootEntropy()
         let networkSuffix = try tldProvider.currentTldOrError()
         let runtimeConfig = try Self.makeRuntimeConfig(
-            chainRegistry: chainRegistry,
             secret: secret,
             liteUsername: settingsManager.string(for: .username),
             networkSuffix: networkSuffix,
@@ -193,37 +187,16 @@ final class TrUAPIHostRuntimeProvider: TrUAPIHostRuntimeProviding, @unchecked Se
 }
 
 extension TrUAPIHostRuntimeProvider {
-    /// Assemble the immutable host-wide config. Genesis hashes are fetched from
-    /// the registry and must resolve; a missing hash fails explicitly rather
-    /// than degrading. `networkSuffix` is the dotNS TLD the core derives the
-    /// wallet's reserved identities under, so it has to be the one the app's own
-    /// built-in accounts derive from. Exposed for testing the genesis-validation
-    /// seam.
+    /// Assemble the immutable host-wide config. Every chain fact the core uses
+    /// comes from the stack this build bundles, ``TrUAPIBundledStack/current``.
+    /// `networkSuffix` is the dotNS TLD the app's own built-in accounts derive
+    /// from, which names the products backing the pinned Pocket cards.
     static func makeRuntimeConfig(
-        chainRegistry: ChainRegistryProtocol,
         secret: Data,
         liteUsername: String?,
         networkSuffix: String,
         databaseDirectory: String
     ) throws -> HostRuntimeConfig {
-        let peopleChain = try chainRegistry.getChainOrError(for: AppConfig.Chains.peopleChain)
-        let bulletinChain = try chainRegistry.getChainOrError(for: AppConfig.Chains.bulletInChain)
-        let assetHubChain = try chainRegistry.getChainOrError(for: AppConfig.Chains.assethubChain)
-
-        guard let peopleGenesisHex = peopleChain.explicitGenesisHash else {
-            throw TrUAPIRuntimeConfigError.missingGenesisHash(chain: "people")
-        }
-        guard let bulletinGenesisHex = bulletinChain.explicitGenesisHash else {
-            throw TrUAPIRuntimeConfigError.missingGenesisHash(chain: "bulletin")
-        }
-        // Product manifests are read from the dotNS contracts on Asset Hub, so
-        // a missing hash here refuses every cross-product `trustedProducts`
-        // grant indistinguishably from the other product granting nothing.
-        // Fail explicitly, like its siblings, rather than passing all-zero.
-        guard let assetHubGenesisHex = assetHubChain.explicitGenesisHash else {
-            throw TrUAPIRuntimeConfigError.missingGenesisHash(chain: "assetHub")
-        }
-
         let bundle = Bundle.main
         let version = bundle.appVersion.map { version in
             bundle.appBuild.map { "\(version) (\($0))" } ?? version
@@ -234,10 +207,7 @@ extension TrUAPIHostRuntimeProvider {
             hostVersion: version,
             platformType: "ios",
             platformVersion: UIDevice.current.systemVersion,
-            peopleChainGenesisHash: Data(hexString: peopleGenesisHex),
-            bulletinChainGenesisHash: Data(hexString: bulletinGenesisHex),
-            assetHubChainGenesisHash: Data(hexString: assetHubGenesisHex),
-            networkSuffix: networkSuffix,
+            stack: TrUAPIBundledStack.current.load(),
             databaseDirectory: databaseDirectory,
             pinnedPocketCards: AssetPinnedPocketCards(tld: networkSuffix).cards(),
             localSessionSecret: secret,
diff --git a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPISupportedChains.swift b/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPISupportedChains.swift
deleted file mode 100644
index 58f5925917..0000000000
--- a/hosts/ios/polkadot-app/Modules/Products/TrUAPI/TrUAPISupportedChains.swift
+++ /dev/null
@@ -1,43 +0,0 @@
-import Foundation
-import TrUAPIHost
-import ChainRegistry
-import SubstrateSdk
-
-/// Builds the ``HostChainSet`` the rust core queries via `supportedChains()`:
-/// the app's configured people, bulletin, and asset-hub chains, each resolved
-/// to its genesis hash. Chains the registry cannot resolve are omitted so the
-/// set matches exactly what `chainConnect` accepts.
-enum TrUAPISupportedChains {
-    static func make(chainRegistry: ChainRegistryProtocol) -> HostChainSet {
-        let roles: [(identifier: ChainIdentifier, chainId: ChainModel.Id)] = [
-            (.people, AppConfig.Chains.peopleChain),
-            (.bulletin, AppConfig.Chains.bulletInChain),
-            (.assetHub, AppConfig.Chains.assethubChain)
-        ]
-
-        let chains = roles.compactMap { role -> HostChainEntry? in
-            guard
-                let chain = chainRegistry.getChain(for: role.chainId),
-                let genesisHex = chain.explicitGenesisHash,
-                let genesis = try? Data(hexString: genesisHex)
-            else {
-                return nil
-            }
-            return HostChainEntry(identifier: role.identifier, genesisHash: genesis)
-        }
-
-        return HostChainSet(network: network, chains: chains)
-    }
-
-    private static var network: String {
-        #if UNSTABLE
-            "polkadot"
-        #elseif SAFETYNET
-            "polkadot"
-        #elseif NIGHTLY
-            "paseo"
-        #else
-            "polkadot"
-        #endif
-    }
-}
diff --git a/hosts/ios/polkadot-appTests/TrUAPI/RustHostRuntimeBridgeTests.swift b/hosts/ios/polkadot-appTests/TrUAPI/RustHostRuntimeBridgeTests.swift
index ddafa7a1e0..acfe2abc7b 100644
--- a/hosts/ios/polkadot-appTests/TrUAPI/RustHostRuntimeBridgeTests.swift
+++ b/hosts/ios/polkadot-appTests/TrUAPI/RustHostRuntimeBridgeTests.swift
@@ -135,18 +135,39 @@ struct RustHostRuntimeBridgeTests {
 
 // MARK: - Runtime config
 
+private func makeDatabaseDirectory() throws -> String {
+    let directory = FileManager.default.temporaryDirectory
+        .appendingPathComponent(UUID().uuidString, isDirectory: true)
+    try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
+    return directory.path
+}
+
 struct TrUAPIHostRuntimeProviderConfigTests {
-    /// Missing chains fail explicitly rather than degrading — the config seam
-    /// throws when the registry cannot resolve the required chains.
-    @Test func makeRuntimeConfigThrowsWhenChainsMissing() {
-        #expect(throws: (any Error).self) {
-            _ = try TrUAPIHostRuntimeProvider.makeRuntimeConfig(
-                chainRegistry: MockChainRegistry(),
-                secret: Data([0x01]),
-                liteUsername: nil,
-                networkSuffix: "paseo",
-                databaseDirectory: NSTemporaryDirectory()
-            )
-        }
+    /// The core verifies the bundled descriptor under the build's stack link
+    /// before it starts, so a config the core refuses leaves the app with no
+    /// runtime and no product can open.
+    @Test func runtimeStartsFromTheAssembledConfig() throws {
+        let config = try TrUAPIHostRuntimeProvider.makeRuntimeConfig(
+            secret: Data(repeating: 7, count: 32),
+            liteUsername: nil,
+            networkSuffix: "testnet",
+            databaseDirectory: makeDatabaseDirectory()
+        )
+
+        _ = try TrUAPIHostRuntime(bridge: makeHostBridge(), runtimeConfig: config)
+    }
+
+    /// Tests run in one build only, so the stacks the other builds run are
+    /// started here as well: a copy refreshed without its link, or a
+    /// reserved-values flag that refuses its stack, fails before it ships.
+    @Test(arguments: [TrUAPIBundledStack.previewnet, TrUAPIBundledStack.paseoNextV2, TrUAPIBundledStack.polkadot])
+    func everyBundledStackStartsTheCore(stack: TrUAPIBundledStack.Definition) throws {
+        let config = try HostRuntimeConfig(
+            hostName: "Polkadot App",
+            stack: stack.load(),
+            databaseDirectory: makeDatabaseDirectory()
+        )
+
+        _ = try TrUAPIHostRuntime(bridge: makeHostBridge(), runtimeConfig: config)
     }
 }
diff --git a/ios/truapi-host/README.md b/ios/truapi-host/README.md
index 678b635d4c..4d9eabf49c 100644
--- a/ios/truapi-host/README.md
+++ b/ios/truapi-host/README.md
@@ -73,7 +73,7 @@ Run `rebuild.sh` after changing anything host-visible — the `NativeTrUApiHostR
 
 For local iteration without publishing, set `TRUAPI_USE_LOCAL_BINARY=1` so the root `Package.swift` builds against `Binaries/` directly.
 
-The embedding app implements `HostBridge` (defined in `TrUAPIHost.swift`): navigation, push, permissions, auth state, scoped + core storage, chain JSON-RPC, confirmations, preimage, theme, feature support, and the served chain set. UI-decision callbacks are `async` and awaited by the Rust core. `HostCallbackAdapter` translates it to the UniFFI-generated `HostCallbacks` protocol; `TrUAPIHostRuntime` and each product execution retain their own adapter. Conform to `HostBridge` rather than to the generated protocol: its extension defaults the optional callbacks, so a newly added one does not break the build. Storage arrives as the `storage` and `coreStorage` sub-objects, which the adapter flattens.
+The embedding app implements `HostBridge` (defined in `TrUAPIHost.swift`): navigation, push, permissions, auth state, scoped + core storage, chain JSON-RPC, confirmations, preimage, theme, and feature support. UI-decision callbacks are `async` and awaited by the Rust core. `HostCallbackAdapter` translates it to the UniFFI-generated `HostCallbacks` protocol; `TrUAPIHostRuntime` and each product execution retain their own adapter. Conform to `HostBridge` rather than to the generated protocol: its extension defaults the optional callbacks, so a newly added one does not break the build. Storage arrives as the `storage` and `coreStorage` sub-objects, which the adapter flattens.
 
 ## Integrating in an iOS app
 
@@ -94,20 +94,22 @@ manifest PR to keep `main` current. SPM pins the resolved revision in the app's
 `Package.resolved`; update it with File > Packages > Update in Xcode or
 `xcodebuild -resolvePackageDependencies` after the tag is published.
 
-`HostRuntimeConfig.networkSuffix` is required. Supply the bare TLD (`dot`,
-`paseo`, or `testnet`) from the same network configuration used by onboarding
-and the People/Bulletin genesis hashes. It must match the People chain's
-`NetworkSuffix.NetworkSuffix`. Include this configuration update in the
-embedding app's package upgrade.
-
-`HostRuntimeConfig.assetHubChainGenesisHash` is required. Supply the Asset Hub
-genesis hash from the same network configuration, as 32 bytes. Product manifests
-are read from the dotNS contracts deployed there, so it is what makes a
-`trustedProducts` grant resolvable: without a usable value no manifest resolves,
-so every cross-product grant not already cached is refused, and the refusal is
-indistinguishable from the other product having granted nothing. Pass 32 zero
-bytes only to declare deliberately that this host has no Asset Hub. Include this
-configuration update in the embedding app's package upgrade.
+`HostRuntimeConfig.stack` is required. It is the Trinity stack the build runs,
+as a `BundledStack`:
+
+- `pointer` is the stack's link, `polkadotapp://stack?key=0x…&url=…`. It must
+  carry a key.
+- `descriptor` is the signed descriptor the build bundles, byte for byte as
+  served. The core verifies it under the pointer's key.
+- `allowsReservedValues` is true only in a Polkadot build. Without it the core
+  refuses a stack that uses Polkadot's genesis hashes or the `dot` TLD.
+
+The core takes every chain it uses from the descriptor, and answers products'
+chain info queries from its `chains` and `network`. The descriptor's TLD is the
+one the wallet's reserved identities derive under. An invalid stack makes
+`TrUAPIHostRuntime(bridge:runtimeConfig:)` throw
+`NativeRuntimeConfigError.Invalid(reason:)`. Include this configuration update
+in the embedding app's package upgrade.
 
 Run the package tests in their UIKit host on an iOS simulator (the xcframework has no macOS slice). The helper installs pinned XcodeGen under `.agent/tools`, generates the project, and selects an available simulator:
 
@@ -163,10 +165,7 @@ let runtime = try TrUAPIHostRuntime(
     bridge: bridge,
     runtimeConfig: HostRuntimeConfig(
         hostName: "My Chat Host",
-        peopleChainGenesisHash: peopleChainGenesisHash,   // exactly 32 bytes
-        bulletinChainGenesisHash: bulletinChainGenesisHash,
-        assetHubChainGenesisHash: assetHubChainGenesisHash,
-        networkSuffix: "dot"
+        stack: bundledStack
     )
 )
 // Chat needs an active session; without one every Chat call answers denied.
@@ -604,16 +603,16 @@ final class MyBridge: HostBridge, @unchecked Sendable {
 }
 
 let bridge = MyBridge()
+let descriptorURL = Bundle.main.url(forResource: "trinity-stack", withExtension: "json")!
 let runtimeConfig = HostRuntimeConfig(
     hostName: "My Host",
     hostIcon: "https://host.example/icon.png",
-    peopleChainGenesisHash: Data(repeating: 0, count: 32),
-    bulletinChainGenesisHash: Data(repeating: 0, count: 32),
-    // Stand-in for a real Asset Hub genesis hash. Non-zero on purpose:
-    // all-zero is the "no Asset Hub" sentinel and refuses every cross-product
-    // `trustedProducts` grant.
-    assetHubChainGenesisHash: Data(repeating: 1, count: 32),
-    networkSuffix: "dot"
+    stack: BundledStack(
+        // The link the bundled descriptor was published under.
+        pointer: "polkadotapp://stack?key=0x…&url=…",
+        descriptor: try Data(contentsOf: descriptorURL),
+        allowsReservedValues: false
+    )
 )
 let runtime = try TrUAPIHostRuntime(bridge: bridge, runtimeConfig: runtimeConfig)
 try runtime.activateLocalSession(secret: entropyBytes, liteUsername: nil)
diff --git a/ios/truapi-host/Sources/TrUAPIHost/TrUAPIHost.swift b/ios/truapi-host/Sources/TrUAPIHost/TrUAPIHost.swift
index 2876e00985..0a19592f96 100644
--- a/ios/truapi-host/Sources/TrUAPIHost/TrUAPIHost.swift
+++ b/ios/truapi-host/Sources/TrUAPIHost/TrUAPIHost.swift
@@ -151,10 +151,6 @@ public protocol HostBridge: AnyObject, Sendable {
     /// return promptly.
     func featureSupported(request: HostFeatureSupportedRequest) async throws -> Bool
 
-    /// Enumerate the chains this host serves: its environment plus one entry
-    /// per chain role. Invoked on the dispatcher thread; must return promptly.
-    func supportedChains() throws -> HostChainSet
-
     /// The chains this host builds as V5 general transactions, each with its
     /// transaction extension pipeline; every other chain is built as V4. The
     /// core builds its own extrinsics the same way. Defaults to none.
@@ -422,7 +418,6 @@ public extension HostBridge {
             languageTag: Locale.current.language.languageCode?.identifier ?? "en"
         )
     }
-    func supportedChains() throws -> HostChainSet { HostChainSet(network: "", chains: []) }
     func transactionExtensionVersions() async throws -> ExtensionVersionMap {
         ExtensionVersionMap(chains: [])
     }
@@ -842,12 +837,6 @@ private final class HostCallbackAdapter: HostCallbacks, @unchecked Sendable {
         }
     }
 
-    func supportedChains() throws -> HostChainSet {
-        try withHostRejection {
-            try bridge.supportedChains()
-        }
-    }
-
     func transactionExtensionVersions() async throws -> ExtensionVersionMap {
         try await withHostRejection {
             try await bridge.transactionExtensionVersions()
diff --git a/ios/truapi-host/Tests/ProductNetworkAccessTests.swift b/ios/truapi-host/Tests/ProductNetworkAccessTests.swift
index 7252122598..a585d57712 100644
--- a/ios/truapi-host/Tests/ProductNetworkAccessTests.swift
+++ b/ios/truapi-host/Tests/ProductNetworkAccessTests.swift
@@ -275,9 +275,7 @@ private struct NetworkTestProduct {
         let server = try await NetworkTestServer.start()
         do {
             let runtime = try TrUAPIHostRuntime(bridge: bridge, runtimeConfig: HostRuntimeConfig(
-                hostName: "network-tests", peopleChainGenesisHash: Data(repeating: 0, count: 32),
-                bulletinChainGenesisHash: Data(repeating: 0, count: 32),
-                assetHubChainGenesisHash: Data(repeating: 1, count: 32), networkSuffix: "paseo",
+                hostName: "network-tests", stack: previewnetStack(),
                 databaseDirectory: temporaryDatabaseDirectory()
             ))
             let execution = try runtime.openProductExecution(
diff --git a/ios/truapi-host/Tests/TrUAPIWsBridgeTests.swift b/ios/truapi-host/Tests/TrUAPIWsBridgeTests.swift
index b0e127cab2..2dbdfd93c2 100644
--- a/ios/truapi-host/Tests/TrUAPIWsBridgeTests.swift
+++ b/ios/truapi-host/Tests/TrUAPIWsBridgeTests.swift
@@ -153,12 +153,7 @@ private extension TrUAPIWsBridgeTests {
     static func makeHostRuntimeConfig() throws -> HostRuntimeConfig {
         try HostRuntimeConfig(
             hostName: "truapi-host-tests",
-            peopleChainGenesisHash: Data(repeating: 0, count: 32),
-            bulletinChainGenesisHash: Data(repeating: 0, count: 32),
-            // Non-zero: all-zero is the "no Asset Hub" sentinel, and this
-            // fixture is not exercising that case.
-            assetHubChainGenesisHash: Data(repeating: 1, count: 32),
-            networkSuffix: "paseo",
+            stack: previewnetStack(),
             databaseDirectory: temporaryDatabaseDirectory()
         )
     }
@@ -229,6 +224,24 @@ final class StubCoreStorage: HostCoreStorageBackend, @unchecked Sendable {
     }
 }
 
+/// The previewnet stack the CLI bundles, read from its signed copies in this
+/// checkout, so the core verifies a real descriptor against its link.
+///
+/// The tests run on a simulator, which reads the host file system, so the
+/// path comes from this file's location rather than a test bundle resource.
+func previewnetStack() throws -> BundledStack {
+    let stacks = URL(fileURLWithPath: #filePath)
+        .deletingLastPathComponent()
+        .appendingPathComponent("../../../rust/crates/truapi-host-cli/stacks")
+        .standardizedFileURL
+    let link = try String(contentsOf: stacks.appendingPathComponent("previewnet.link"), encoding: .utf8)
+    return try BundledStack(
+        pointer: link.trimmingCharacters(in: .whitespacesAndNewlines),
+        descriptor: Data(contentsOf: stacks.appendingPathComponent("previewnet.json")),
+        allowsReservedValues: false
+    )
+}
+
 // Conforms to HostBridge rather than the generated HostCallbacks, so the
 // protocol extension supplies every optional callback and a new one cannot
 // leave this file behind. Only the six requirements without a default are
@@ -293,7 +306,6 @@ final class StubHostBridge: HostBridge, @unchecked Sendable {
         request _: RemotePermission
     ) async throws -> PermissionDecision { nextRemoteDecision() }
     func featureSupported(request _: HostFeatureSupportedRequest) async throws -> Bool { true }
-    func supportedChains() throws -> HostChainSet { HostChainSet(network: "", chains: []) }
     func localStorageRead(key: String) throws -> Data? { try storage.read(key: key) }
     
     func localStorageWrite(key: String, value: Data) throws {
diff --git a/js/packages/truapi-host/README.md b/js/packages/truapi-host/README.md
index 1cc065d9cb..adc4819544 100644
--- a/js/packages/truapi-host/README.md
+++ b/js/packages/truapi-host/README.md
@@ -27,20 +27,22 @@ The package exposes tree-shakeable subpath exports — import only what your env
 `WasmSigningHostRuntime`; `wasm/testing` adds the Rust `wasm-signing-host` and
 `test-host` features, which is what lets the test host hold keys and answer
 resource allocation as granted without allocating anything.
-`ProductRuntimeConfig` configures the pairing host and requires no network
-suffix. The signing constructor's configuration requires
-`runtimeConfig.networkSuffix` in addition: the bare TLD (`dot`, `paseo`, or
-`testnet`) matching the People chain and the wallet's onboarding
-configuration.
-
-`runtimeConfig.assetHub` is required by both configurations, pairing and
-signing. It is the Asset Hub genesis hash, in the same shape as
-`runtimeConfig.people` and `runtimeConfig.bulletin`. Product manifests are read
-from the dotNS contracts deployed there, so it is what makes a
-`trustedProducts` grant resolvable: without a usable value no manifest resolves,
-so every cross-product grant not already cached is refused, and the refusal is
-indistinguishable from the other product having granted nothing. A config
-omitting it is rejected.
+`ProductRuntimeConfig` configures both host roles. Its `stack` is the Trinity
+stack the host build runs: `pointer`, the stack's link
+(`polkadotapp://stack?key=0x…&url=…`), and `descriptor`, the bytes of the
+signed copy the build bundles, which the core verifies against the pointer's
+key. Every chain the core uses, the network `getChainInfo` reports, and the TLD
+a signing host derives its reserved identities under come from that
+descriptor. The core refuses a pointer without a key, a descriptor without a
+People or Bulletin chain, and a stack that uses Polkadot's genesis hashes or
+the `dot` TLD unless `allowsReservedValues` is set, which only a Polkadot build
+does. A stack without an Asset Hub resolves no product manifest from dotNS, so
+every cross-product grant not already cached is refused.
+
+The test host has no descriptor to bundle, so it passes `testStack` in place of
+`stack`: the network, the TLD and each chain's genesis hash. Only the
+`wasm/testing` bundle reads it. `mockRuntimeConfig` fills it with the
+`MOCK_GENESIS` chains, and the Playwright fixture builds it from `networks`.
 
 ## Bundler requirements
 
diff --git a/js/packages/truapi-host/src/runtime.ts b/js/packages/truapi-host/src/runtime.ts
index 32d71bd620..6f9ff3816e 100644
--- a/js/packages/truapi-host/src/runtime.ts
+++ b/js/packages/truapi-host/src/runtime.ts
@@ -60,6 +60,26 @@ export interface ChainConnection {
  */
 export type LogLevel = string;
 
+/** The Trinity stack a host build bundles. */
+export interface BundledStack {
+  /**
+   * The stack's link, `polkadotapp://stack?key=0x…&url=…`. It must carry a key:
+   * the core refuses an unsigned stack.
+   */
+  pointer: string;
+  /**
+   * The bundled descriptor's bytes as served: a signed envelope that verifies
+   * under the pointer's key.
+   */
+  descriptor: Uint8Array;
+  /**
+   * Whether this build may run a stack that uses Polkadot's genesis hashes or
+   * the `dot` TLD. Only a Polkadot or Polkadot-fork build sets it. Defaults to
+   * `false`.
+   */
+  allowsReservedValues?: boolean;
+}
+
 /** Configuration for one product runtime hosted by the wasm core. */
 export interface ProductRuntimeConfig {
   /** Stable identifier used to scope product accounts, permissions, and storage. */
@@ -87,45 +107,17 @@ export interface ProductRuntimeConfig {
     /** Platform or operating-system version. */
     version?: string;
   };
-  /** People-chain configuration used for statement-store SSO. */
-  people: {
-    /** People-chain genesis hash. */
-    genesisHash: string | Uint8Array;
-  };
-  /** Bulletin-chain configuration used for in-core preimage submission. */
-  bulletin: {
-    /** Bulletin-chain genesis hash. */
-    genesisHash: string | Uint8Array;
-  };
   /**
-   * Asset Hub configuration. Session usernames and the product manifests
-   * that carry `trustedProducts` grants are both read from the dotNS
-   * contracts deployed there. Without a usable genesis hash no manifest
-   * resolves, so every cross-product grant not already cached is refused,
-   * indistinguishably from the other product having granted nothing. An
-   * all-zero hash declares deliberately that this host has no Asset Hub.
-   *
-   * The wasm signing host requires the same `assetHub.genesisHash`, though it
-   * takes an untyped config object rather than this interface.
+   * The stack the host build runs. Every chain the core uses, the network
+   * `get_chain_info` reports, and the dotNS TLD a signing host derives its
+   * reserved identities under all come from its descriptor.
    */
-  assetHub: {
-    /** Asset Hub genesis hash. */
-    genesisHash: string | Uint8Array;
-  };
+  stack: BundledStack;
   /** Wallet pairing configuration. */
   pairing: {
     /** URI scheme used for wallet pairing deeplinks. */
     deeplinkScheme: string;
   };
-  /**
-   * dotNS TLD the host's reserved identities derive under, such as `"dot"` or
-   * `"paseo"`.
-   *
-   * Required by a signing host, which derives its own keys and so has to know
-   * which network's identities it is deriving. A pairing host never derives
-   * them -- the paired wallet does -- and ignores this.
-   */
-  networkSuffix?: string;
 }
 
 /**
diff --git a/js/packages/truapi-host/src/test-support.ts b/js/packages/truapi-host/src/test-support.ts
index 647f341599..1c7cf21102 100644
--- a/js/packages/truapi-host/src/test-support.ts
+++ b/js/packages/truapi-host/src/test-support.ts
@@ -1,4 +1,7 @@
+import { readFileSync } from "node:fs";
+
 import type { RequiredHostCallbacks } from "./generated/host-callbacks.js";
+import type { BundledStack } from "./runtime.js";
 
 /** `HostCallbacks` with every optional member required, for exhaustive test fixtures. */
 export type CompleteHostCallbacks = RequiredHostCallbacks;
@@ -27,7 +30,6 @@ export function makeHostCallbacks(
     },
     features: {
       featureSupported: async () => ({ supported: false }),
-      supportedChains: async () => ({ network: "paseo", chains: [] }),
     },
     extrinsicVersion: {
       transactionExtensionVersions: async () => ({ chains: [] }),
@@ -165,3 +167,20 @@ export function makeHostCallbacks(
 export function settle(): Promise<void> {
   return new Promise<void>((resolve) => setImmediate(resolve));
 }
+
+/**
+ * The previewnet stack as a host build bundles it: the signed copy and link
+ * the CLI ships, read from `rust/crates/truapi-host-cli/stacks`.
+ */
+export function bundledTestStack(): BundledStack {
+  const stacks = new URL(
+    "../../../../rust/crates/truapi-host-cli/stacks/",
+    import.meta.url,
+  );
+  return {
+    pointer: readFileSync(new URL("previewnet.link", stacks), "utf8").trim(),
+    descriptor: new Uint8Array(
+      readFileSync(new URL("previewnet.json", stacks)),
+    ),
+  };
+}
diff --git a/js/packages/truapi-host/src/testing.ts b/js/packages/truapi-host/src/testing.ts
index d5af0edd28..089da0a7e1 100644
--- a/js/packages/truapi-host/src/testing.ts
+++ b/js/packages/truapi-host/src/testing.ts
@@ -7,6 +7,7 @@
 export {
   createMockHost,
   mockRuntimeConfig,
+  mockTestStack,
   MOCK_GENESIS,
 } from "./web/create-mock-host.js";
 export type {
@@ -15,8 +16,11 @@ export type {
   MockFaults,
   MockHost,
   MockHostConfig,
+  MockRuntimeConfig,
   PermissionLogEntry,
   PermissionKind,
   PermissionPolicy,
   SigningLogEntry,
+  TestStack,
+  TestStackChain,
 } from "./web/create-mock-host.js";
diff --git a/js/packages/truapi-host/src/testing/create-mock-client.ts b/js/packages/truapi-host/src/testing/create-mock-client.ts
index dc313a6299..8fe8077305 100644
--- a/js/packages/truapi-host/src/testing/create-mock-client.ts
+++ b/js/packages/truapi-host/src/testing/create-mock-client.ts
@@ -28,8 +28,8 @@ import {
   mockRuntimeConfig,
   type MockHost,
   type MockHostConfig,
+  type MockRuntimeConfig,
 } from "../web/create-mock-host.js";
-import type { ProductRuntimeConfig } from "../runtime.js";
 import {
   resolveAccount,
   type DevAccount,
@@ -41,7 +41,7 @@ export interface MockClientOptions {
   /** Behaviour knobs forwarded to {@link createMockHost}. */
   mock?: MockHostConfig;
   /** Overrides merged into {@link mockRuntimeConfig}. */
-  runtimeConfig?: Partial<ProductRuntimeConfig>;
+  runtimeConfig?: Partial<MockRuntimeConfig>;
   /** Account the host signs as. Defaults to `"alice"`. */
   account?: DevAccountName | DevAccount;
   /**
diff --git a/js/packages/truapi-host/src/testing/dev-accounts.ts b/js/packages/truapi-host/src/testing/dev-accounts.ts
index 2b0b0fef38..c24c849d60 100644
--- a/js/packages/truapi-host/src/testing/dev-accounts.ts
+++ b/js/packages/truapi-host/src/testing/dev-accounts.ts
@@ -13,6 +13,8 @@
 // pin addresses by reading them back from the host, never by hard-coding a
 // well-known one.
 
+import { mockTestStack, type TestStack } from "../web/create-mock-host.js";
+
 /** Name of a built-in dev account. */
 export type DevAccountName = "alice" | "bob" | "charlie" | "dave";
 
@@ -144,8 +146,8 @@ export const DEFAULT_CHAIN = PASEO_ASSET_HUB;
 /**
  * Fixture settings for proxying one real chain.
  *
- * A live chain has to agree in three places -- what the host proxies to, what
- * it reports serving, and what its runtime config declares -- and the product
+ * A live chain has to agree in three places: what the host proxies to, what
+ * it reports serving, and the Asset Hub of the test stack it runs. The product
  * checks the last two against its own descriptor bundle. Getting one of them
  * wrong fails as a genesis mismatch that names neither the setting nor the
  * file, so this builds all three from one value.
@@ -161,25 +163,24 @@ export const DEFAULT_CHAIN = PASEO_ASSET_HUB;
 export function liveChain(chain: { rpcUrl: string; genesisHash: string }): {
   mock: {
     chainProxies: { rpcUrl: string }[];
-    supportedChains: {
-      network: string;
-      chains: { identifier: "AssetHub"; genesisHash: `0x${string}` }[];
-    };
+    servedChains: string[];
   };
-  runtimeConfig: Record<string, unknown>;
+  runtimeConfig: { testStack: TestStack };
 } {
-  const genesisHash = chain.genesisHash as `0x${string}`;
   return {
     mock: {
       // No hash on the proxy: it takes every request, so routing survives a
       // reset even while the declared hash below has to be re-pinned.
       chainProxies: [{ rpcUrl: chain.rpcUrl }],
-      supportedChains: {
+      servedChains: [chain.genesisHash],
+    },
+    runtimeConfig: {
+      testStack: {
+        ...mockTestStack(),
         network: "paseo",
-        chains: [{ identifier: "AssetHub", genesisHash }],
+        assetHub: { genesisHash: chain.genesisHash },
       },
     },
-    runtimeConfig: { assetHub: { genesisHash } },
   };
 }
 
diff --git a/js/packages/truapi-host/src/testing/fixture-compat.test.ts b/js/packages/truapi-host/src/testing/fixture-compat.test.ts
index 75144b4013..34e93fb658 100644
--- a/js/packages/truapi-host/src/testing/fixture-compat.test.ts
+++ b/js/packages/truapi-host/src/testing/fixture-compat.test.ts
@@ -11,6 +11,7 @@ import {
 import { createMockClient } from "./create-mock-client.js";
 import { wasmIsBuilt } from "./require-wasm.js";
 import { PASEO_ASSET_HUB, LIVE_CHAINS } from "./dev-accounts.js";
+import { mockTestStack } from "../web/create-mock-host.js";
 
 const SAMPLE_CHAIN = {
   id: "paseo-asset-hub",
@@ -49,29 +50,40 @@ async function hostPageUrlFor(
 }
 
 describe("host-api-test-sdk option compatibility", () => {
-  it("expands `networks` into the three settings that must agree", () => {
-    const { mock, runtimeConfig } = fromNetworks([SAMPLE_CHAIN]);
-    expect(mock.supportedChains).toEqual({
-      network: "paseo",
-      chains: [{ identifier: "AssetHub", genesisHash: "0x23e730eb" }],
-    });
+  it("expands `networks` into the settings that must agree", () => {
     // Unhashed on purpose: an unhashed proxy takes every request, so routing
-    // survives a chain reset even when the declared hash goes stale.
-    expect(mock.chainProxies).toEqual([{ rpcUrl: SAMPLE_CHAIN.rpcUrl }]);
-    expect(runtimeConfig).toEqual({ assetHub: { genesisHash: "0x23e730eb" } });
+    // survives a chain reset even when the declared hash goes stale. The test
+    // stack keeps the mock People and Bulletin, which the core needs to start.
+    expect(fromNetworks([SAMPLE_CHAIN])).toEqual({
+      mock: {
+        chainProxies: [{ rpcUrl: SAMPLE_CHAIN.rpcUrl }],
+        servedChains: ["0x23e730eb"],
+      },
+      runtimeConfig: {
+        testStack: {
+          ...mockTestStack(),
+          network: "paseo",
+          assetHub: { genesisHash: "0x23e730eb" },
+        },
+      },
+    });
   });
 
   it("reads the chain's role from the id suffix", () => {
-    expect(
-      fromNetworks([{ ...SAMPLE_CHAIN, id: "paseo-people" }]).runtimeConfig,
-    ).toEqual({ people: { genesisHash: "0x23e730eb" } });
-    const relay = fromNetworks([{ ...SAMPLE_CHAIN, id: "previewnet" }]);
-    expect(relay.mock.supportedChains).toEqual({
-      network: "previewnet",
-      chains: [{ identifier: "Relay", genesisHash: "0x23e730eb" }],
-    });
-    // The runtime config has no relay slot, so there is nothing to declare.
-    expect(relay.runtimeConfig).toEqual({});
+    const stackOf = (id: string) =>
+      fromNetworks([{ ...SAMPLE_CHAIN, id }]).runtimeConfig.testStack;
+    expect([stackOf("paseo-people"), stackOf("previewnet")]).toEqual([
+      {
+        ...mockTestStack(),
+        network: "paseo",
+        people: { genesisHash: "0x23e730eb" },
+      },
+      {
+        ...mockTestStack(),
+        network: "previewnet",
+        relay: { genesisHash: "0x23e730eb" },
+      },
+    ]);
   });
 
   it("rejects a pinned product account, and says why", () => {
@@ -104,8 +116,8 @@ describe("host-api-test-sdk option compatibility", () => {
   it("exports PASEO_ASSET_HUB, carrying the hash we actually proxy to", () => {
     expect(PASEO_ASSET_HUB.id).toBe("paseo-asset-hub");
     const expanded = fromNetworks([PASEO_ASSET_HUB]);
-    expect(expanded.runtimeConfig).toEqual({
-      assetHub: { genesisHash: LIVE_CHAINS.paseoAssetHub.genesisHash },
+    expect(expanded.runtimeConfig.testStack.assetHub).toEqual({
+      genesisHash: LIVE_CHAINS.paseoAssetHub.genesisHash,
     });
   });
 
diff --git a/js/packages/truapi-host/src/testing/host-page.ts b/js/packages/truapi-host/src/testing/host-page.ts
index 39cc81c17f..a8826d1aa3 100644
--- a/js/packages/truapi-host/src/testing/host-page.ts
+++ b/js/packages/truapi-host/src/testing/host-page.ts
@@ -37,8 +37,8 @@ import {
   mockRuntimeConfig,
   type MockHost,
   type MockHostConfig,
+  type MockRuntimeConfig,
 } from "../web/create-mock-host.js";
-import type { ProductRuntimeConfig } from "../runtime.js";
 import {
   checkDerivationIndex,
   resolveAccount,
@@ -63,7 +63,7 @@ export interface TestHostPageOptions {
   /** Behaviour knobs forwarded to {@link createMockHost}. */
   mock?: MockHostConfig;
   /** Overrides merged into {@link mockRuntimeConfig}. */
-  runtimeConfig?: Partial<ProductRuntimeConfig>;
+  runtimeConfig?: Partial<MockRuntimeConfig>;
   /**
    * Resolved WASM entry. Defaults to the signing-enabled `testing` bundle,
    * which is what lets the host own dev accounts instead of waiting on a
diff --git a/js/packages/truapi-host/src/testing/networks.ts b/js/packages/truapi-host/src/testing/networks.ts
index 55ff9bff7e..081dfabc66 100644
--- a/js/packages/truapi-host/src/testing/networks.ts
+++ b/js/packages/truapi-host/src/testing/networks.ts
@@ -3,7 +3,11 @@
 // by the Playwright fixture and the node server, so a suite gets the same
 // chains whichever one it configures.
 
-import type { MockHostConfig } from "../web/create-mock-host.js";
+import {
+  mockTestStack,
+  type MockHostConfig,
+  type TestStack,
+} from "../web/create-mock-host.js";
 
 /** One chain, in `@parity/host-api-test-sdk`'s shape. */
 export interface NetworkConfig {
@@ -20,7 +24,7 @@ export interface NetworkConfig {
 function splitChainId(id: string): {
   network: string;
   identifier: "AssetHub" | "People" | "Bulletin" | "Relay";
-  configKey?: "assetHub" | "people" | "bulletin";
+  stackKey: "assetHub" | "people" | "bulletin" | "relay";
 } {
   const suffixes = [
     ["-asset-hub", "AssetHub", "assetHub"],
@@ -29,12 +33,15 @@ function splitChainId(id: string): {
   ] as const;
   for (const [suffix, identifier, configKey] of suffixes) {
     if (id.endsWith(suffix)) {
-      return { network: id.slice(0, -suffix.length), identifier, configKey };
+      return {
+        network: id.slice(0, -suffix.length),
+        identifier,
+        stackKey: configKey,
+      };
     }
   }
-  // No suffix: the id names the network and the chain is its relay. The
-  // runtime config has no relay slot, so there is no key to declare it under.
-  return { network: id, identifier: "Relay" };
+  // No suffix: the id names the network and the chain is its relay.
+  return { network: id, identifier: "Relay", stackKey: "relay" };
 }
 
 /**
@@ -48,7 +55,11 @@ function splitChainId(id: string): {
 export type LoopbackStatements = boolean | "default";
 
 /**
- * Expand `networks` into the three settings that have to agree.
+ * Expand `networks` into the settings that have to agree: the proxies that
+ * route each chain, the chains `featureSupported` reports served, and the test
+ * stack the core answers `getChainInfo` from. A role `networks` leaves out
+ * keeps the {@link mockTestStack} chain, because the core needs People and
+ * Bulletin to start.
  *
  * A single proxy carries no genesis hash: an unhashed proxy takes every
  * request, so routing survives a chain reset while only the DECLARED hash --
@@ -63,22 +74,14 @@ export function fromNetworks(
   networks: NetworkConfig[],
   loopbackStatements: LoopbackStatements = false,
 ): {
-  mock: Pick<MockHostConfig, "chainProxies" | "supportedChains">;
-  runtimeConfig: Record<string, unknown>;
+  mock: Pick<MockHostConfig, "chainProxies" | "servedChains">;
+  runtimeConfig: { testStack: TestStack };
 } {
-  const runtimeConfig: Record<string, unknown> = {};
-  const chains: { identifier: string; genesisHash: string }[] = [];
-  let network = "paseo";
+  const testStack: TestStack = { ...mockTestStack(), network: "paseo" };
   for (const entry of networks) {
     const split = splitChainId(entry.id);
-    network = split.network || network;
-    chains.push({
-      identifier: split.identifier,
-      genesisHash: entry.genesisHash,
-    });
-    if (split.configKey) {
-      runtimeConfig[split.configKey] = { genesisHash: entry.genesisHash };
-    }
+    testStack.network = split.network || testStack.network;
+    testStack[split.stackKey] = { genesisHash: entry.genesisHash };
   }
   // Only the People chain carries the statement store, so serving it locally on
   // the hub as well would claim a store where none exists. A suite that declares
@@ -117,9 +120,9 @@ export function fromNetworks(
         rpcUrl: entry.rpcUrl,
         ...(servesStatements(entry) ? { loopbackStatements: true } : {}),
       })),
-      supportedChains: { network, chains },
-    } as Pick<MockHostConfig, "chainProxies" | "supportedChains">,
-    runtimeConfig,
+      servedChains: networks.map((entry) => entry.genesisHash),
+    },
+    runtimeConfig: { testStack },
   };
 }
 
diff --git a/js/packages/truapi-host/src/testing/playwright.ts b/js/packages/truapi-host/src/testing/playwright.ts
index d1ab840430..ae8371596e 100644
--- a/js/packages/truapi-host/src/testing/playwright.ts
+++ b/js/packages/truapi-host/src/testing/playwright.ts
@@ -98,8 +98,8 @@ export interface TestHostFixtureOptions {
   /**
    * Chains to serve, in `@parity/host-api-test-sdk`'s `NetworkConfig` shape.
    *
-   * A convenience over spelling out `mock.chainProxies`, `mock.supportedChains`
-   * and `runtimeConfig` separately, which have to agree. The chain's role is
+   * A convenience over spelling out `mock.chainProxies`, `mock.servedChains`
+   * and `runtimeConfig.testStack` separately, which have to agree. The chain's role is
    * read from the `id` suffix (`-asset-hub`, `-people`, `-bulletin`, else the
    * relay) and the rest of the id is the network name.
    *
diff --git a/js/packages/truapi-host/src/testing/server-config.test.ts b/js/packages/truapi-host/src/testing/server-config.test.ts
index c1a7e925a9..5b93cfb565 100644
--- a/js/packages/truapi-host/src/testing/server-config.test.ts
+++ b/js/packages/truapi-host/src/testing/server-config.test.ts
@@ -2,6 +2,7 @@ import { asProductId } from "@parity/truapi";
 import { describe, expect, it } from "bun:test";
 import { deepLinkUrl, hostPageUrl, productUrlFor } from "./host-page-url.js";
 import { createTestHostServer } from "./server.js";
+import { mockTestStack } from "../web/create-mock-host.js";
 
 describe("createTestHostServer host configuration", () => {
   it("returns a URL carrying the configuration it was given", async () => {
@@ -44,13 +45,14 @@ describe("createTestHostServer host configuration", () => {
     const url = new URL(server.url);
     expect(JSON.parse(url.searchParams.get("mock")!)).toMatchObject({
       chainProxies: [{ rpcUrl: "wss://hub.invalid" }],
-      supportedChains: {
-        network: "paseo",
-        chains: [{ identifier: "AssetHub", genesisHash }],
-      },
+      servedChains: [genesisHash],
     });
     expect(JSON.parse(url.searchParams.get("runtimeConfig")!)).toEqual({
-      assetHub: { genesisHash },
+      testStack: {
+        ...mockTestStack(),
+        network: "paseo",
+        assetHub: { genesisHash },
+      },
     });
     await server.close();
   });
@@ -72,7 +74,7 @@ describe("createTestHostServer host configuration", () => {
       JSON.parse(new URL(server.url).searchParams.get("mock")!),
     ).toMatchObject({
       chainProxies: [],
-      supportedChains: { network: "paseo" },
+      servedChains: [`0x${"aa".repeat(32)}`],
     });
     await server.close();
   });
diff --git a/js/packages/truapi-host/src/web/create-mock-host.test.ts b/js/packages/truapi-host/src/web/create-mock-host.test.ts
index 48ea349ff3..893f930c04 100644
--- a/js/packages/truapi-host/src/web/create-mock-host.test.ts
+++ b/js/packages/truapi-host/src/web/create-mock-host.test.ts
@@ -659,14 +659,22 @@ describe("createMockHost TestHostAPI parity", () => {
     // The Rust mock declares the same three. A suite that routes on a chain
     // has to be answered the same way by either, and dropping one here would
     // otherwise only show up as a chain-routed call failing much later.
-    const host = createMockHost();
-    expect(await host.callbacks.features.supportedChains()).toEqual({
+    const host = createMockHost({ onlyServedChains: true });
+    const supported = (genesisHash: string) =>
+      host.callbacks.features
+        .featureSupported({ tag: "Chain", value: { genesisHash } })
+        .then((answer) => answer.supported);
+    expect(
+      await Promise.all(
+        [...Object.values(MOCK_GENESIS), `0x${"44".repeat(32)}`].map(supported),
+      ),
+    ).toEqual([true, true, true, false]);
+    expect(mockRuntimeConfig().testStack).toEqual({
       network: "mock",
-      chains: [
-        { identifier: "People", genesisHash: MOCK_GENESIS.people },
-        { identifier: "Bulletin", genesisHash: MOCK_GENESIS.bulletin },
-        { identifier: "AssetHub", genesisHash: MOCK_GENESIS.assetHub },
-      ],
+      tld: "paseo",
+      people: { genesisHash: MOCK_GENESIS.people },
+      bulletin: { genesisHash: MOCK_GENESIS.bulletin },
+      assetHub: { genesisHash: MOCK_GENESIS.assetHub },
     });
   });
 
@@ -936,9 +944,6 @@ describe("createMockHost TestHostAPI parity", () => {
         value: { genesisHash: "0x00" },
       }),
     ).rejects.toThrow("unknown");
-    await expect(feature.callbacks.features.supportedChains()).rejects.toThrow(
-      "unknown",
-    );
 
     const confirmation = createMockHost({
       faults: { confirmationError: "no ui" },
diff --git a/js/packages/truapi-host/src/web/create-mock-host.ts b/js/packages/truapi-host/src/web/create-mock-host.ts
index dbd01c0a60..0143888242 100644
--- a/js/packages/truapi-host/src/web/create-mock-host.ts
+++ b/js/packages/truapi-host/src/web/create-mock-host.ts
@@ -43,7 +43,6 @@ import type {
 import type {
   AuthState,
   CoreStorageKey,
-  HostChainSet,
   HostScan,
   JsonRpcConnection,
   PermissionDecision,
@@ -164,7 +163,7 @@ export interface MockFaults {
   confirmationError?: string;
   /** Device and remote permission prompts fail with this reason. */
   permissionError?: string;
-  /** `featureSupported` and `supportedChains` fail with this reason. */
+  /** `featureSupported` fails with this reason. */
   featureError?: string;
   /** Chat room, bot, and message calls fail with this reason. */
   chatError?: string;
@@ -406,7 +405,7 @@ export interface MockHostConfig {
   /** Whether `featureSupported` reports support. Default `true`. */
   featureSupported?: boolean;
   /**
-   * When set, `featureSupported` answers from `supportedChains`, as a real host
+   * When set, `featureSupported` answers from `servedChains`, as a real host
    * does, so a chain outside that set is unsupported. Default `false`. It
    * becomes the default in a later breaking release. The Rust
    * `MockConfig::only_served_chains` is the same option.
@@ -454,14 +453,12 @@ export interface MockHostConfig {
    */
   chainProxies?: ChainProxy[];
   /**
-   * Chains the host reports serving (RFC 0026). Defaults to the three
-   * {@link MOCK_GENESIS} chains, which are what {@link mockRuntimeConfig}
-   * declares.
-   *
-   * An empty set type-checks and then fails every chain-routed call, so
-   * override this only to assert that failure.
+   * Genesis hashes of the chains the host serves, which `featureSupported`
+   * answers from when `onlyServedChains` is set. Defaults to the three
+   * {@link MOCK_GENESIS} chains, the ones {@link mockRuntimeConfig}'s stack
+   * names. `getChainInfo` answers from that stack, not from this list.
    */
-  supportedChains?: HostChainSet;
+  servedChains?: string[];
 }
 
 /** A mock host: the callbacks to wire into a provider, plus assertion oracles. */
@@ -900,14 +897,7 @@ export function createMockHost(config: MockHostConfig = {}): MockHost {
     languageTag = "en",
     faults = {},
     scanner,
-    supportedChains = {
-      network: "mock",
-      chains: [
-        { identifier: "People", genesisHash: MOCK_GENESIS.people },
-        { identifier: "Bulletin", genesisHash: MOCK_GENESIS.bulletin },
-        { identifier: "AssetHub", genesisHash: MOCK_GENESIS.assetHub },
-      ],
-    },
+    servedChains = Object.values(MOCK_GENESIS),
   } = config;
 
   const scan = scanner === undefined ? undefined : { answer: scanner };
@@ -1252,17 +1242,13 @@ export function createMockHost(config: MockHostConfig = {}): MockHost {
         if (faults.featureError) throw new Error(faults.featureError);
         const served =
           !onlyServedChains ||
-          supportedChains.chains.some(
-            (entry) =>
-              normalizeHash(entry.genesisHash) ===
+          servedChains.some(
+            (genesisHash) =>
+              normalizeHash(genesisHash) ===
               normalizeHash(request.value.genesisHash),
           );
         return { supported: featureSupported && served };
       },
-      async supportedChains() {
-        if (faults.featureError) throw new Error(faults.featureError);
-        return supportedChains;
-      },
     },
 
     chain: {
@@ -1735,13 +1721,63 @@ export const MOCK_GENESIS = {
     "0x3333333333333333333333333333333333333333333333333333333333333333",
 } as const;
 
+/** One chain of a {@link TestStack}. */
+export interface TestStackChain {
+  /** The chain's genesis hash, as 0x-prefixed hex or bytes. */
+  genesisHash: string | Uint8Array;
+}
+
+/**
+ * The stack a test host runs, built from its parts because a test host has no
+ * signed descriptor to bundle. Only the testing wasm bundle reads it; the
+ * production bundle takes a {@link ProductRuntimeConfig.stack} only.
+ */
+export interface TestStack {
+  /** The network `getChainInfo` reports. */
+  network: string;
+  /** The dotNS TLD a signing host derives its reserved identities under. */
+  tld: string;
+  /** The People chain, which the core runs SSO over. */
+  people: TestStackChain;
+  /** The Bulletin chain, which takes the core's own preimage submissions. */
+  bulletin: TestStackChain;
+  /** Asset Hub, where product manifests resolve from dotNS. */
+  assetHub?: TestStackChain;
+  /** The relay chain. */
+  relay?: TestStackChain;
+  /**
+   * Whether the stack may use Polkadot's genesis hashes or the `dot` TLD.
+   * Defaults to `false`, as on a real host.
+   */
+  allowsReservedValues?: boolean;
+}
+
+/** A {@link ProductRuntimeConfig} for a test host, with a {@link TestStack}. */
+export type MockRuntimeConfig = Omit<ProductRuntimeConfig, "stack"> & {
+  testStack: TestStack;
+};
+
 /**
- * A default {@link ProductRuntimeConfig} for a mock host. Override any field;
- * the genesis hashes and product id are placeholders suitable for tests.
+ * The stack a mock host runs by default: network `mock` under the `paseo`
+ * TLD, over the {@link MOCK_GENESIS} chains.
+ */
+export function mockTestStack(): TestStack {
+  return {
+    network: "mock",
+    tld: "paseo",
+    people: { genesisHash: MOCK_GENESIS.people },
+    bulletin: { genesisHash: MOCK_GENESIS.bulletin },
+    assetHub: { genesisHash: MOCK_GENESIS.assetHub },
+  };
+}
+
+/**
+ * A default {@link MockRuntimeConfig} for a mock host. Override any field;
+ * the stack and product id are placeholders suitable for tests.
  */
 export function mockRuntimeConfig(
-  overrides: Partial<ProductRuntimeConfig> = {},
-): ProductRuntimeConfig {
+  overrides: Partial<MockRuntimeConfig> = {},
+): MockRuntimeConfig {
   return {
     productId: asProductId("mock.dot"),
     host: {
@@ -1753,15 +1789,10 @@ export function mockRuntimeConfig(
       type: "node",
       version: "0",
     },
-    people: { genesisHash: MOCK_GENESIS.people },
-    bulletin: { genesisHash: MOCK_GENESIS.bulletin },
-    assetHub: { genesisHash: MOCK_GENESIS.assetHub },
+    testStack: mockTestStack(),
     pairing: {
       deeplinkScheme: "polkadotapp",
     },
-    // A signing host refuses to start without this; a pairing host ignores it.
-    // Setting it unconditionally keeps one config usable for both roles.
-    networkSuffix: "paseo",
     ...overrides,
   };
 }
diff --git a/js/packages/truapi-host/src/web/wasm-bridge.test.ts b/js/packages/truapi-host/src/web/wasm-bridge.test.ts
index 35db8134d5..5fd1d898d5 100644
--- a/js/packages/truapi-host/src/web/wasm-bridge.test.ts
+++ b/js/packages/truapi-host/src/web/wasm-bridge.test.ts
@@ -4,8 +4,18 @@ import { readFileSync } from "node:fs";
 
 import { CoreStorageKey } from "../generated/host-callbacks.js";
 import { createMockHost, mockRuntimeConfig } from "./create-mock-host.js";
+import { bundledTestStack } from "../test-support.js";
 import { wasmIsBuilt } from "../testing/require-wasm.js";
 
+/**
+ * {@link mockRuntimeConfig} with the bundled previewnet stack in place of its
+ * test stack: the production bundle reads only a signed `stack`.
+ */
+function bundledRuntimeConfig() {
+  const { testStack: _testStack, ...config } = mockRuntimeConfig();
+  return { ...config, stack: bundledTestStack() };
+}
+
 // Drives the REAL truapi WASM core against createMockHost's callbacks —
 // headless, no browser, no worker — to prove the JS↔SCALE↔WASM callback bridge.
 // Requires the built WASM artifact (`npm run build:wasm`); skipped when it is
@@ -95,7 +105,7 @@ suite("real WASM core ↔ createMockHost bridge", () => {
       ...createWasmRawCallbacks(mock.callbacks),
       requestWorkerTransition: () => {},
     };
-    const { productId, ...hostConfig } = mockRuntimeConfig();
+    const { productId, ...hostConfig } = bundledRuntimeConfig();
     const runtime = new WasmPairingHostRuntime(raw, hostConfig);
     // The core emits response frames through `emitFrame`; the worker supplies
     // it per-core outside the generated adapter, so the harness does too.
@@ -111,6 +121,32 @@ suite("real WASM core ↔ createMockHost bridge", () => {
     expect(mock.getHostCallCount()).toBeGreaterThan(0);
   });
 
+  it("refuses a stack pointer without a key", async () => {
+    // A host refreshes its stack unseen, so the production bundle runs only a
+    // signed stack, whatever the copy it was handed.
+    const { initSync, WasmPairingHostRuntime } = await import(glueUrl.href);
+    const { createWasmRawCallbacks } =
+      await import("../generated/host-callbacks-adapter.js");
+    initSync({ module: readFileSync(wasmUrl) });
+    const { productId: _productId, ...hostConfig } = bundledRuntimeConfig();
+    const pointer = new URL(hostConfig.stack.pointer);
+    pointer.searchParams.delete("key");
+
+    expect(
+      () =>
+        new WasmPairingHostRuntime(
+          {
+            ...createWasmRawCallbacks(createMockHost().callbacks),
+            requestWorkerTransition: () => {},
+          },
+          {
+            ...hostConfig,
+            stack: { ...hostConfig.stack, pointer: pointer.href },
+          },
+        ),
+    ).toThrow("runtimeConfig.stack: stack pointer has no key");
+  });
+
   it("isolates one real-core boot from the next through reset()", async () => {
     // The surface-agreement test proves the Rust and JS mocks expose the same
     // control methods. It cannot prove those methods hold against a real core.
@@ -122,7 +158,7 @@ suite("real WASM core ↔ createMockHost bridge", () => {
     initSync({ module: readFileSync(wasmUrl) });
 
     const mock = createMockHost();
-    const { productId, ...hostConfig } = mockRuntimeConfig();
+    const { productId, ...hostConfig } = bundledRuntimeConfig();
     const boot = async () => {
       const runtime = new WasmPairingHostRuntime(
         {
diff --git a/js/packages/truapi-host/src/web/worker-test-harness.ts b/js/packages/truapi-host/src/web/worker-test-harness.ts
index 550910ae07..435e710bf6 100644
--- a/js/packages/truapi-host/src/web/worker-test-harness.ts
+++ b/js/packages/truapi-host/src/web/worker-test-harness.ts
@@ -14,7 +14,7 @@
 import { expect } from "bun:test";
 import { asProductId } from "@parity/truapi";
 
-import { makeHostCallbacks } from "../test-support.js";
+import { bundledTestStack, makeHostCallbacks } from "../test-support.js";
 import type { ProductRuntimeConfig } from "../runtime.js";
 import { createWebWorkerPairingHostRuntime } from "./index.js";
 import type { CreateWebWorkerPairingHostRuntimeOptions } from "./index.js";
@@ -84,18 +84,7 @@ export function runtimeConfig(
       type: "node",
       version: process.versions.node,
     },
-    people: {
-      genesisHash:
-        "0xa22a2424d2cbf561eaecf7da8b1b548fa9d1939f60265e942b1049616a012f71",
-    },
-    bulletin: {
-      genesisHash:
-        "0xbbcccc1cbe333151b8ed63b17e9e0dec61ee53b57296f1fbe2d161ae3e6fb4dc",
-    },
-    assetHub: {
-      genesisHash:
-        "0xcccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc",
-    },
+    stack: bundledTestStack(),
     pairing: {
       deeplinkScheme: "polkadotapp",
     },
diff --git a/rust/crates/truapi-codegen/tests/golden/host-callbacks-adapter.ts b/rust/crates/truapi-codegen/tests/golden/host-callbacks-adapter.ts
index 63484f6529..03fa23d35b 100644
--- a/rust/crates/truapi-codegen/tests/golden/host-callbacks-adapter.ts
+++ b/rust/crates/truapi-codegen/tests/golden/host-callbacks-adapter.ts
@@ -34,7 +34,6 @@ import {
   CoreStorageKey,
   DevicePermissionStatus,
   ExtensionVersionMap,
-  HostChainSet,
   HostContactLookup,
   HostContactMatches,
   HostContactPick,
@@ -81,7 +80,6 @@ export interface RawCallbacks {
   clearCoreStorage(key: Uint8Array): Promise<void>;
   transactionExtensionVersions(): Promise<Uint8Array>;
   featureSupported(request: Uint8Array): Promise<Uint8Array>;
-  supportedChains(): Promise<Uint8Array>;
   scheduleGameReminder?(product: Uint8Array, startsAt: bigint): Promise<void>;
   cancelGameReminder?(product: Uint8Array): Promise<void>;
   subscribeLocale(
@@ -211,8 +209,6 @@ export function createWasmRawCallbacks(
           HostFeatureSupportedRequest.dec(request),
         ),
       ),
-    supportedChains: async () =>
-      HostChainSet.enc(await callbacks.features.supportedChains()),
     ...(game
       ? {
           scheduleGameReminder: async (product, startsAt) =>
diff --git a/rust/crates/truapi-codegen/tests/golden/host-callbacks.ts b/rust/crates/truapi-codegen/tests/golden/host-callbacks.ts
index 72c66b4fb6..f84a89cdf2 100644
--- a/rust/crates/truapi-codegen/tests/golden/host-callbacks.ts
+++ b/rust/crates/truapi-codegen/tests/golden/host-callbacks.ts
@@ -9,7 +9,6 @@ import * as S from "@parity/truapi/scale";
 import {
   AllocatableResource,
   Bytes32,
-  ChainIdentifier,
   CodeFormat,
   FundingDirection,
   FundingQuote,
@@ -424,37 +423,6 @@ export type FundingQuoteUnavailable =
    */
   | { tag: "Timeout"; value?: undefined };
 
-/**
- * One chain a host serves: a protocol chain role mapped to the concrete
- * chain of the host's configured environment.
- */
-export interface HostChainEntry {
-  /**
-   * Protocol role this entry answers for.
-   */
-  identifier: ChainIdentifier;
-
-  /**
-   * Genesis hash identifying the chain in all chain-scoped calls.
-   */
-  genesisHash: Bytes32;
-}
-
-/**
- * The chain set a host serves: its environment plus one entry per chain role.
- */
-export interface HostChainSet {
-  /**
-   * Ecosystem the host is configured for, e.g. "polkadot", "paseo".
-   */
-  network: string;
-
-  /**
-   * Chains this host serves, keyed by protocol role.
-   */
-  chains: Array<HostChainEntry>;
-}
-
 /**
  * Contact handles the core needs turned back into accounts, and the key they
  * were minted under.
@@ -1219,29 +1187,6 @@ export const FundingQuoteUnavailable: S.Codec<FundingQuoteUnavailable> = S.lazy(
     }),
 );
 
-/**
- * One chain a host serves: a protocol chain role mapped to the concrete
- * chain of the host's configured environment.
- */
-export const HostChainEntry: S.Codec<HostChainEntry> = S.lazy(
-  (): S.Codec<HostChainEntry> =>
-    S.Struct({
-      identifier: ChainIdentifier,
-      genesisHash: Bytes32,
-    }) as S.Codec<HostChainEntry>,
-);
-
-/**
- * The chain set a host serves: its environment plus one entry per chain role.
- */
-export const HostChainSet: S.Codec<HostChainSet> = S.lazy(
-  (): S.Codec<HostChainSet> =>
-    S.Struct({
-      network: S.str,
-      chains: S.Vector(HostChainEntry),
-    }) as S.Codec<HostChainSet>,
-);
-
 /**
  * Contact handles the core needs turned back into accounts, and the key they
  * were minted under.
@@ -1922,12 +1867,6 @@ export interface Features {
   featureSupported(
     request: HostFeatureSupportedRequest,
   ): Promise<HostFeatureSupportedResponse>;
-
-  /**
-   * Enumerate the chains this host serves (RFC 0026). The core resolves
-   * `get_chain_info` requests against the returned set.
-   */
-  supportedChains(): Promise<HostChainSet>;
 }
 
 /**
diff --git a/rust/crates/truapi-codegen/tests/golden/wasm_bridge.rs b/rust/crates/truapi-codegen/tests/golden/wasm_bridge.rs
index 1e94ce0b48..04a995fc04 100644
--- a/rust/crates/truapi-codegen/tests/golden/wasm_bridge.rs
+++ b/rust/crates/truapi-codegen/tests/golden/wasm_bridge.rs
@@ -40,7 +40,6 @@ pub struct JsBridge {
     pub clear_core_storage: Function,
     pub transaction_extension_versions: Function,
     pub feature_supported: Function,
-    pub supported_chains: Function,
     pub schedule_game_reminder: Function,
     pub cancel_game_reminder: Function,
     pub subscribe_locale: Function,
@@ -98,7 +97,6 @@ impl JsBridge {
                 "transactionExtensionVersions",
             )?,
             feature_supported: get_function(callbacks, "featureSupported")?,
-            supported_chains: get_function(callbacks, "supportedChains")?,
             schedule_game_reminder: get_optional_function(callbacks, "scheduleGameReminder")?
                 .unwrap_or_else(|| missing_callback("scheduleGameReminder")),
             cancel_game_reminder: get_optional_function(callbacks, "cancelGameReminder")?
@@ -379,16 +377,6 @@ impl crate::platform::Features for WasmPlatform {
             "featureSupported response did not decode",
         )?)
     }
-
-    async fn supported_chains(
-        &self,
-    ) -> Result<crate::platform::HostChainSet, latest::GenericError> {
-        let bytes = invoke_bytes_return(&self.bridge.supported_chains, Vec::new()).await?;
-        Ok(decode_bytes::<crate::platform::HostChainSet>(
-            bytes,
-            "supportedChains response did not decode",
-        )?)
-    }
 }
 
 #[async_trait::async_trait]
diff --git a/rust/crates/truapi-codegen/tests/golden/worker-callbacks.ts b/rust/crates/truapi-codegen/tests/golden/worker-callbacks.ts
index 70ae5f668e..3997263783 100644
--- a/rust/crates/truapi-codegen/tests/golden/worker-callbacks.ts
+++ b/rust/crates/truapi-codegen/tests/golden/worker-callbacks.ts
@@ -23,7 +23,6 @@ export const CALLBACK_NAMES = [
   "clearCoreStorage",
   "transactionExtensionVersions",
   "featureSupported",
-  "supportedChains",
   "scheduleGameReminder",
   "cancelGameReminder",
   "navigateTo",
@@ -79,7 +78,6 @@ function rawCallbacks(
     | "clearCoreStorage"
     | "transactionExtensionVersions"
     | "featureSupported"
-    | "supportedChains"
     | "navigateTo"
     | "pushNotification"
     | "cancelNotification"
@@ -117,10 +115,6 @@ function rawCallbacks(
       bridge.callbackRequest("featureSupported", [request]) as ReturnType<
         Required<RawCallbacks>["featureSupported"]
       >,
-    supportedChains: () =>
-      bridge.callbackRequest("supportedChains", []) as ReturnType<
-        Required<RawCallbacks>["supportedChains"]
-      >,
     navigateTo: (url) =>
       bridge.callbackRequest("navigateTo", [url]) as ReturnType<
         Required<RawCallbacks>["navigateTo"]
diff --git a/rust/crates/truapi-host-cli/README.md b/rust/crates/truapi-host-cli/README.md
index b57e660cb0..b94606f9f9 100644
--- a/rust/crates/truapi-host-cli/README.md
+++ b/rust/crates/truapi-host-cli/README.md
@@ -1112,7 +1112,7 @@ role), its `dub` service as the identity backend (the `dub` URL with `/api/v1`
 appended), its `tld` and its `dotns.popController` replace the network's. A
 stack that lacks one of those roles, gives two of them one genesis hash, has a
 `tld` the core does not serve (`paseo`, `testnet`), is unreachable or is past
-`expiresAt` is an error. The product namespace (`HostChainSet.network` and the
+`expiresAt` is an error. `get_chain_info` reports the descriptor's `network`. The product namespace (the
 state directory) is the descriptor's `id` without a trailing `-fork`. Use a
 separate `--base-path` and a disposable identity for a local stack. The routing
 applies to every chain role the host serves, including the Bulletin node the CLI
diff --git a/rust/crates/truapi-host-cli/SPEC.md b/rust/crates/truapi-host-cli/SPEC.md
index b91ce6e047..1b74431c19 100644
--- a/rust/crates/truapi-host-cli/SPEC.md
+++ b/rust/crates/truapi-host-cli/SPEC.md
@@ -1757,7 +1757,7 @@ descriptor that breaks a rule and one past `expiresAt` are errors that name the
 stack; one past `validUntil` is used with a warning. Its endpoints and People's
 `NetworkSuffix` are checked as above. `--chain-backend light-client` is
 refused with `--stack`, since the light client syncs only the networks
-`truapi-provider` bundles. The product namespace (`HostChainSet.network` and the
+`truapi-provider` bundles. `get_chain_info` reports the descriptor's `network`. The product namespace (the
 state directory) is the descriptor's `id` without a trailing `-fork`, which must
 be a lowercase label.
 
@@ -2028,9 +2028,9 @@ Deliberately unavailable methods:
 - all four Payment methods, which answer typed `Unknown` domain errors.
 
 A successful `System/feature_supported` call resolves the queried chain against
-the host's chain set, the same set `Chain/get_chain_info` answers from, so it
-returns `true` for the network's People, Bulletin and Asset Hub genesis hashes and
-`false` for anything else. Success means the method is wired, not that every feature
+the chains the host serves, the People, Bulletin and Asset Hub of its stack, the
+same roles `Chain/get_chain_info` answers for, so it returns `true` for those
+genesis hashes and `false` for anything else. Success means the method is wired, not that every feature
 is present.
 
 ### 15.2 Platform-specific semantics
diff --git a/rust/crates/truapi-host-cli/src/chain/tests.rs b/rust/crates/truapi-host-cli/src/chain/tests.rs
index 12764b6f1c..545e0849b2 100644
--- a/rust/crates/truapi-host-cli/src/chain/tests.rs
+++ b/rust/crates/truapi-host-cli/src/chain/tests.rs
@@ -182,22 +182,22 @@ fn every_served_role_routes_to_its_own_chain() {
 	for network in Network::value_variants() {
 		let config = network.config();
 		let provider = CliChainProvider::with_live_chain_routing(&config, false);
-		for entry in config.host_chain_set().chains {
-			let expected = config.url_for_role(entry.identifier).unwrap_or_else(|| {
-				panic!("{} serves {:?} with no preset URL", config.id, entry.identifier)
+		for (identifier, genesis_hash) in config.served_roles() {
+			let expected = config.url_for_role(identifier).unwrap_or_else(|| {
+				panic!("{} serves {:?} with no preset URL", config.id, identifier)
 			});
 			assert!(
-				provider.routes(&entry.genesis_hash),
+				provider.routes(&genesis_hash),
 				"{} serves {:?} but does not route it; the fallback would hide this",
 				config.id,
-				entry.identifier
+				identifier
 			);
 			assert_eq!(
-				provider.location(entry.genesis_hash),
+				provider.location(genesis_hash),
 				expected,
 				"{} serves {:?} but routes it elsewhere",
 				config.id,
-				entry.identifier
+				identifier
 			);
 		}
 	}
diff --git a/rust/crates/truapi-host-cli/src/frame_server/tests.rs b/rust/crates/truapi-host-cli/src/frame_server/tests.rs
index f9b61692b1..bb364f9e8a 100644
--- a/rust/crates/truapi-host-cli/src/frame_server/tests.rs
+++ b/rust/crates/truapi-host-cli/src/frame_server/tests.rs
@@ -81,10 +81,7 @@ fn signing_runtime() -> Result<Arc<dyn ProductRuntimeFactory>> {
 			platform: truapi::latest::HostPlatform::Cli,
 		},
 		truapi::platform::PlatformInfo { kind: Some("test".into()), version: None },
-		network.people_genesis,
-		network.bulletin_genesis,
-		network.asset_hub_genesis,
-		network.network_suffix.to_string(),
+		network.stack()?,
 	)?;
 	let spawner: truapi::subscription::Spawner = Arc::new(|_| {});
 	Ok(Arc::new(SigningHostRuntime::new(platform, config, spawner)))
@@ -489,10 +486,7 @@ mod cross_product_storage {
 				platform: truapi::latest::HostPlatform::Cli,
 			},
 			truapi::platform::PlatformInfo { kind: Some("test".into()), version: None },
-			network.people_genesis,
-			network.bulletin_genesis,
-			network.asset_hub_genesis,
-			network.network_suffix.to_string(),
+			network.stack()?,
 		)?;
 		// An override written to a field this path never reads compiles,
 		// changes nothing, and looks identical in timings. Assert it.
diff --git a/rust/crates/truapi-host-cli/src/main.rs b/rust/crates/truapi-host-cli/src/main.rs
index 19f4a4efbb..fb9f3ca3c5 100644
--- a/rust/crates/truapi-host-cli/src/main.rs
+++ b/rust/crates/truapi-host-cli/src/main.rs
@@ -1348,9 +1348,7 @@ async fn run_pairing_host(
 	let config = PairingHostConfig::new(
 		host_info("Headless Pairing Host"),
 		platform_info(),
-		network.people_genesis,
-		network.bulletin_genesis,
-		network.asset_hub_genesis,
+		network.stack().context("invalid stack")?,
 		DEEPLINK_SCHEME.to_string(),
 	)
 	.context("invalid pairing host config")?;
@@ -1895,10 +1893,7 @@ fn build_signing_runtime(
 	let config = SigningHostConfig::new(
 		host_info("Headless Signing Host"),
 		platform_info(),
-		network.people_genesis,
-		network.bulletin_genesis,
-		network.asset_hub_genesis,
-		network.network_suffix.to_string(),
+		network.stack().context("invalid stack")?,
 	)
 	.context("invalid signing host config")?;
 	let status_host = platform.clone() as Arc<dyn PermissionStatusHost>;
diff --git a/rust/crates/truapi-host-cli/src/network.rs b/rust/crates/truapi-host-cli/src/network.rs
index 4078540f74..ff410948ba 100644
--- a/rust/crates/truapi-host-cli/src/network.rs
+++ b/rust/crates/truapi-host-cli/src/network.rs
@@ -6,7 +6,7 @@ use trinity_stack::{Descriptor, Fetched, Pointer, Status, accept};
 use truapi::{
 	latest::ChainIdentifier,
 	platform::{
-		ChainExtensionVersion, DOTNS_TLDS, ExtensionVersionMap, HostChainEntry, HostChainSet,
+		ChainExtensionVersion, DOTNS_TLDS, ExtensionVersionMap, Stack, StackChains, StackError,
 	},
 };
 
@@ -35,8 +35,7 @@ pub enum Network {
 	PaseoNextV2,
 	/// Built-in stack, read from the descriptor its operator publishes. Its id is
 	/// the id the playground and dotli already use for this network
-	/// (`VITE_NETWORKS=paseo-next-v2,previewnet`), so `HostChainSet::network`
-	/// reads the same string a product sees everywhere else.
+	/// (`VITE_NETWORKS=paseo-next-v2,previewnet`).
 	#[value(name = "previewnet")]
 	Previewnet,
 	/// Polkadot mainnet (People, Bulletin, Asset Hub). Identities are real:
@@ -610,6 +609,7 @@ fn stack_config(descriptor: &Descriptor, id: &'static str) -> Result<NetworkConf
 	roles.ensure_distinct_genesis()?;
 	Ok(NetworkConfig {
 		id,
+		network: leak_str(&descriptor.network),
 		network_suffix,
 		identity_backend_base,
 		people_ws: roles.people.ws,
@@ -900,6 +900,7 @@ const POLKADOT_CHAIN_ENDPOINTS: &[ChainEndpoint] =
 
 const POLKADOT: NetworkConfig = NetworkConfig {
 	id: "polkadot",
+	network: "polkadot",
 	network_suffix: "dot",
 	identity_backend_base: None,
 	people_ws: POLKADOT_PEOPLE.ws,
@@ -917,9 +918,12 @@ const POLKADOT: NetworkConfig = NetworkConfig {
 /// Resolved RPC/backend/genesis values for one network.
 #[derive(Debug, Clone, Copy)]
 pub struct NetworkConfig {
-	/// The product namespace: what `HostChainSet::network` reports and where
-	/// the CLI stores this network's state.
+	/// The product namespace, where the CLI stores this network's state.
 	pub id: &'static str,
+	/// The ecosystem `get_chain_info` reports: the stack descriptor's `network`,
+	/// such as `paseo`, so the CLI reports what an app bundling the same stack
+	/// does.
+	pub network: &'static str,
 	/// The network's dotNS TLD without the dot, as its runtimes report it in
 	/// `NetworkSuffix.NetworkSuffix`. Every reserved RFC-0022 identity the CLI
 	/// derives ends in it (`uid.<suffix>`, `peopl.<suffix>`), so a person the
@@ -937,7 +941,7 @@ pub struct NetworkConfig {
 	pub people_genesis: [u8; 32],
 	pub bulletin_genesis: [u8; 32],
 	/// Asset Hub genesis hash, both the role's identity in
-	/// [`NetworkConfig::host_chain_set`] and its routing key, and the genesis the
+	/// [`NetworkConfig::served_roles`] and its routing key, and the genesis the
 	/// CLI's Asset Hub extrinsics sign in `CheckGenesis`.
 	///
 	/// Wrong here is worse than stale elsewhere: routing matches on it, so a value
@@ -990,10 +994,10 @@ impl NetworkConfig {
 		Ok(())
 	}
 
-	/// The chain set this network serves, for `Features::supported_chains`.
+	/// The chain roles this network serves, each with its genesis hash.
 	///
 	/// One entry per role this struct names a genesis hash for. `ChainEndpoint`
-	/// carries no role, so `live_chain_endpoints` cannot supply one — an endpoint's
+	/// carries no role, so `live_chain_endpoints` cannot supply one: an endpoint's
 	/// identifier is not recoverable from it, which is why a served role needs its
 	/// own field here rather than a lookup into that list.
 	///
@@ -1001,24 +1005,35 @@ impl NetworkConfig {
 	/// unmapped genesis with People, so a role the routing filter drops would
 	/// connect to the wrong chain while the host claimed to serve it.
 	/// `chain::tests::every_served_role_routes_to_its_own_chain` holds that.
-	pub fn host_chain_set(&self) -> HostChainSet {
-		HostChainSet {
-			network: self.id.to_string(),
-			chains: vec![
-				HostChainEntry {
-					identifier: ChainIdentifier::People,
-					genesis_hash: self.people_genesis,
-				},
-				HostChainEntry {
-					identifier: ChainIdentifier::Bulletin,
-					genesis_hash: self.bulletin_genesis,
-				},
-				HostChainEntry {
-					identifier: ChainIdentifier::AssetHub,
-					genesis_hash: self.asset_hub_genesis,
-				},
-			],
-		}
+	pub fn served_roles(&self) -> [(ChainIdentifier, [u8; 32]); 3] {
+		[
+			(ChainIdentifier::People, self.people_genesis),
+			(ChainIdentifier::Bulletin, self.bulletin_genesis),
+			(ChainIdentifier::AssetHub, self.asset_hub_genesis),
+		]
+	}
+
+	/// The stack the core runs on: [`Self::served_roles`], the
+	/// [`Self::network`] `get_chain_info` reports, and the TLD. The CLI resolved
+	/// and checked these values itself, from a descriptor, the local-network
+	/// file or Polkadot's pinned values, so it hands them to the core as parts.
+	///
+	/// Only a network whose identities are real may use Polkadot's reserved
+	/// values. Every stack read from a descriptor has disposable identities,
+	/// so its id cannot grant them.
+	pub fn stack(&self) -> Result<Stack, StackError> {
+		let chains = StackChains {
+			relay: None,
+			asset_hub: Some(self.asset_hub_genesis),
+			people: self.people_genesis,
+			bulletin: self.bulletin_genesis,
+		};
+		Stack::new(
+			self.network.to_string(),
+			self.network_suffix.to_string(),
+			chains,
+			!self.disposable_identities,
+		)
 	}
 
 	/// The chains this network builds as V5 general transactions: People and
diff --git a/rust/crates/truapi-host-cli/src/network/local_network/tests.rs b/rust/crates/truapi-host-cli/src/network/local_network/tests.rs
index 8f9df0ee03..d6e53994b2 100644
--- a/rust/crates/truapi-host-cli/src/network/local_network/tests.rs
+++ b/rust/crates/truapi-host-cli/src/network/local_network/tests.rs
@@ -20,13 +20,13 @@ fn test_local_routes_presets() {
 		assert_eq!(resolved.network_suffix, base.network_suffix);
 		assert_eq!(resolved.identity_backend_base, Some("http://127.0.0.1:8092/api/v1"));
 		assert_eq!(resolved.live_chain_endpoints.len(), 3);
-		for role in resolved.host_chain_set().chains {
+		for (identifier, genesis_hash) in resolved.served_roles() {
 			let route = resolved
 				.live_chain_endpoints
 				.iter()
-				.find(|route| route.genesis == role.genesis_hash)
+				.find(|route| route.genesis == genesis_hash)
 				.unwrap();
-			assert_eq!(Some(route.ws), resolved.url_for_role(role.identifier));
+			assert_eq!(Some(route.ws), resolved.url_for_role(identifier));
 			assert!(route.required_for_host);
 			assert!(route.ws.starts_with("ws://127.0.0.1:"));
 		}
diff --git a/rust/crates/truapi-host-cli/src/network/tests.rs b/rust/crates/truapi-host-cli/src/network/tests.rs
index 6f4c811f13..ccd4de1ba2 100644
--- a/rust/crates/truapi-host-cli/src/network/tests.rs
+++ b/rust/crates/truapi-host-cli/src/network/tests.rs
@@ -13,20 +13,20 @@ use super::*;
 fn served_chain_genesis_hashes_match_the_endpoint_routes() {
 	for network in Network::value_variants() {
 		let config = network.config();
-		for entry in config.host_chain_set().chains {
-			let expected_ws = config.url_for_role(entry.identifier).unwrap_or_else(|| {
-				panic!("{} serves {:?} with no URL", config.id, entry.identifier)
-			});
+		for (identifier, genesis_hash) in config.served_roles() {
+			let expected_ws = config
+				.url_for_role(identifier)
+				.unwrap_or_else(|| panic!("{} serves {:?} with no URL", config.id, identifier));
 			let endpoint = config
 				.live_chain_endpoints
 				.iter()
-				.find(|endpoint| endpoint.genesis == entry.genesis_hash)
+				.find(|endpoint| endpoint.genesis == genesis_hash)
 				.unwrap_or_else(|| {
 					panic!(
 						"{} serves {:?} at genesis {} which no endpoint routes",
 						config.id,
-						entry.identifier,
-						hex::encode(entry.genesis_hash)
+						identifier,
+						hex::encode(genesis_hash)
 					)
 				});
 			assert_eq!(endpoint.ws, expected_ws);
@@ -42,7 +42,7 @@ fn test_network_served_roles() {
 	for network in Network::value_variants() {
 		let config = network.config();
 		let served: Vec<ChainIdentifier> =
-			config.host_chain_set().chains.iter().map(|entry| entry.identifier).collect();
+			config.served_roles().iter().map(|(identifier, _)| *identifier).collect();
 
 		assert_eq!(
 			served,
@@ -153,8 +153,8 @@ async fn the_advertised_genesis_matches_what_each_chain_reports() {
 
 	for network in Network::value_variants() {
 		let config = network.config();
-		for entry in config.host_chain_set().chains {
-			let ws = config.url_for_role(entry.identifier).expect("every served role has a URL");
+		for (identifier, genesis_hash) in config.served_roles() {
+			let ws = config.url_for_role(identifier).expect("every served role has a URL");
 			let probe = async {
 				let rpc = alloc::rpc::RpcClient::connect(ws)
 					.await
@@ -171,7 +171,7 @@ async fn the_advertised_genesis_matches_what_each_chain_reports() {
 			let (reported, chain_name) = match probe.await {
 				Ok(values) => values,
 				Err(err) => {
-					unreachable.push(format!("{:?} at {ws}: {err}", entry.identifier));
+					unreachable.push(format!("{:?} at {ws}: {err}", identifier));
 					continue;
 				},
 			};
@@ -179,7 +179,7 @@ async fn the_advertised_genesis_matches_what_each_chain_reports() {
 			checked += 1;
 			// Paseo's People chain calls itself "People" and previewnet's calls
 			// itself "Individuality Local", so either name satisfies the role.
-			let expected_in_name: &[&str] = match entry.identifier {
+			let expected_in_name: &[&str] = match identifier {
 				ChainIdentifier::People => &["People", "Individuality"],
 				ChainIdentifier::Bulletin => &["Bulletin"],
 				ChainIdentifier::AssetHub => &["Asset Hub"],
@@ -189,21 +189,21 @@ async fn the_advertised_genesis_matches_what_each_chain_reports() {
 				drifted.push(format!(
 					"{} serves {:?} from {ws}, which calls itself {chain_name:?} and \
 					 contains none of {expected_in_name:?}",
-					config.id, entry.identifier
+					config.id, identifier
 				));
-			} else if entry.genesis_hash == reported {
+			} else if genesis_hash == reported {
 				println!(
 					"{} {:?} {} matches {ws} ({chain_name})",
 					config.id,
-					entry.identifier,
-					hex::encode(entry.genesis_hash)
+					identifier,
+					hex::encode(genesis_hash)
 				);
 			} else {
 				drifted.push(format!(
 					"{} advertises {:?} as {} but {ws} reports {}",
 					config.id,
-					entry.identifier,
-					hex::encode(entry.genesis_hash),
+					identifier,
+					hex::encode(genesis_hash),
 					hex::encode(reported)
 				));
 			}
@@ -227,7 +227,7 @@ async fn the_advertised_genesis_matches_what_each_chain_reports() {
 	assert!(failures.is_empty(), "{}", failures.join("\n\n"));
 	let expected_checks: usize = Network::value_variants()
 		.iter()
-		.map(|network| network.config().host_chain_set().chains.len())
+		.map(|network| network.config().served_roles().len())
 		.sum();
 	assert!(expected_checks > 0);
 	assert_eq!(checked, expected_checks);
@@ -960,3 +960,55 @@ fn test_refresh_expired_error() {
 	let published = expired(11);
 	assert!(refresh(&sign_copy(10, "g1"), Fetched::Document(&published)).is_err());
 }
+
+/// A product sees the same network, TLD and chains from the CLI as from an app
+/// bundling the same stack: the descriptor's `network`, not the CLI's product
+/// namespace for it. The CLI serves no Relay, so it names none.
+#[test]
+fn the_stack_reports_what_an_app_bundling_it_reports() {
+	let stacks = |network: Network| {
+		let built_in = network.built_in_stack()?;
+		let bundled = Stack::bundled(built_in.link.trim(), built_in.bundle, false)
+			.expect("the bundled copy starts an app");
+		let cli = network.config().stack().expect("the CLI's stack starts");
+		Some((network, cli, bundled))
+	};
+
+	for (network, cli, bundled) in Network::value_variants().iter().copied().filter_map(stacks) {
+		let expected = Stack::new(
+			bundled.network().to_string(),
+			bundled.tld().to_string(),
+			StackChains { relay: None, ..bundled.chains().clone() },
+			false,
+		);
+		assert_eq!(Ok(cli), expected, "{}", network.id());
+	}
+}
+
+/// Only Polkadot's pinned values may use Polkadot's genesis hashes and `dot`.
+/// A stack read from a descriptor has disposable identities whatever its id
+/// says, so the core holds it to the reserved values.
+#[test]
+fn a_descriptor_stack_cannot_claim_polkadot_reserved_values() {
+	let dot = edit_stack(|descriptor| {
+		descriptor["id"] = "polkadot-fork".into();
+		descriptor["tld"] = "dot".into();
+	});
+
+	assert_eq!(
+		stack_network_config(&dot).unwrap().stack(),
+		Err(StackError::Reserved { value: "tld dot".to_string() })
+	);
+}
+
+/// Polkadot runs on Polkadot's reserved genesis hashes and `dot`, which the
+/// core refuses on any stack its host does not vouch for. Every built-in
+/// network has to start, Polkadot included.
+#[test]
+fn every_built_in_network_builds_a_stack() {
+	let refused: Vec<_> = Network::value_variants()
+		.iter()
+		.filter_map(|network| network.config().stack().err().map(|error| (*network, error)))
+		.collect();
+	assert_eq!(refused, Vec::new());
+}
diff --git a/rust/crates/truapi-host-cli/src/platform.rs b/rust/crates/truapi-host-cli/src/platform.rs
index 6972a510df..91c91c4936 100644
--- a/rust/crates/truapi-host-cli/src/platform.rs
+++ b/rust/crates/truapi-host-cli/src/platform.rs
@@ -167,8 +167,9 @@ impl CliStoragePaths {
 /// Headless-host platform shared by both roles.
 pub struct CliPlatform {
 	chain: Arc<CliChainProvider>,
-	/// Chain roles this host serves, answered by `Features::supported_chains`.
-	chains: truapi::platform::HostChainSet,
+	/// Genesis hashes of the chain roles this host serves, which
+	/// `Features::feature_supported` answers from.
+	served_chains: Vec<[u8; 32]>,
 	extension_versions: truapi::platform::ExtensionVersionMap,
 	product_storage: Mutex<HashMap<ProductId, HashMap<String, Vec<u8>>>>,
 	core_storage: Mutex<HashMap<Vec<u8>, Vec<u8>>>,
@@ -256,7 +257,7 @@ impl CliPlatform {
 		let bitswap = BitswapRpc::new(Arc::clone(&chain), network.bulletin_genesis);
 		Arc::new(Self {
 			chain,
-			chains: network.host_chain_set(),
+			served_chains: network.served_roles().map(|(_, genesis)| genesis).to_vec(),
 			extension_versions: network.extension_versions(),
 			product_storage: Mutex::new(product_storage),
 			core_storage: Mutex::new(core_storage),
@@ -806,16 +807,11 @@ impl Features for CliPlatform {
 	) -> Result<api::HostFeatureSupportedResponse, api::GenericError> {
 		let api::HostFeatureSupportedRequest::Chain { genesis_hash } = request;
 		let supported = self
-			.chains
-			.chains
+			.served_chains
 			.iter()
-			.any(|entry| entry.genesis_hash.as_slice() == genesis_hash.as_slice());
+			.any(|served| served.as_slice() == genesis_hash.as_slice());
 		Ok(api::HostFeatureSupportedResponse { supported })
 	}
-
-	async fn supported_chains(&self) -> Result<truapi::platform::HostChainSet, api::GenericError> {
-		Ok(self.chains.clone())
-	}
 }
 
 impl truapi::platform::AuthPresenter for CliPlatform {
diff --git a/rust/crates/truapi-host-cli/src/platform/tests.rs b/rust/crates/truapi-host-cli/src/platform/tests.rs
index f4d1fec97b..52317eeb9e 100644
--- a/rust/crates/truapi-host-cli/src/platform/tests.rs
+++ b/rust/crates/truapi-host-cli/src/platform/tests.rs
@@ -13,9 +13,9 @@ fn test_network() -> crate::network::NetworkConfig {
 /// registration and both create-transaction variants, and `AssetHub` for the
 /// other seventeen.
 ///
-/// `feature_supported` answers from the same set `supported_chains` serves, so
-/// the two cannot disagree. The negatives are the malformed inputs, a well-formed
-/// hash the host serves no role for, and the all-zero SSO sentinel — which the
+/// `feature_supported` answers from the roles the network serves, the same
+/// ones its stack names, so the two cannot disagree. The negatives are the malformed inputs, a
+/// well-formed hash the host serves no role for, and the all-zero SSO sentinel — which the
 /// provider does route, to the People fallback, yet is still not a served role.
 #[test]
 fn feature_supported_resolves_against_the_served_chain_set() {
@@ -33,11 +33,11 @@ fn feature_supported_resolves_against_the_served_chain_set() {
 
 	// Every role the host serves answers supported. The reverse direction is the
 	// `unserved` assertion below, since every served role is now a real chain.
-	for entry in config.host_chain_set().chains {
+	for (identifier, genesis_hash) in config.served_roles() {
 		assert!(
-			supported(entry.genesis_hash.to_vec()),
+			supported(genesis_hash.to_vec()),
 			"{:?} is served but reported unsupported",
-			entry.identifier
+			identifier
 		);
 	}
 
@@ -46,11 +46,7 @@ fn feature_supported_resolves_against_the_served_chain_set() {
 	// bytes" and only the all-zero sentinel would notice.
 	let unserved = [0xab; 32];
 	assert!(
-		!config
-			.host_chain_set()
-			.chains
-			.iter()
-			.any(|entry| entry.genesis_hash == unserved),
+		!config.served_roles().iter().any(|(_, genesis_hash)| *genesis_hash == unserved),
 		"the stand-in must not be a served role"
 	);
 	assert!(!supported(unserved.to_vec()));
@@ -62,28 +58,6 @@ fn feature_supported_resolves_against_the_served_chain_set() {
 	assert!(!supported(vec![0u8; 32]));
 }
 
-#[test]
-fn supported_chains_answers_the_configured_network() {
-	let platform = CliPlatform::new(test_network(), None, ApprovalPolicy::AutoAccept, None);
-	let set = futures::executor::block_on(platform.supported_chains())
-		.expect("the CLI host serves the preset's chains");
-
-	let config = crate::network::Network::default().config();
-	assert_eq!(set.network, config.id);
-	let mut served = set
-		.chains
-		.iter()
-		.map(|entry| (entry.identifier, hex::encode(entry.genesis_hash)))
-		.collect::<Vec<_>>();
-	served.sort_by_key(|(identifier, _)| format!("{identifier:?}"));
-	let mut expected = vec![
-		(api::ChainIdentifier::People, hex::encode(config.people_genesis)),
-		(api::ChainIdentifier::Bulletin, hex::encode(config.bulletin_genesis)),
-		(api::ChainIdentifier::AssetHub, hex::encode(config.asset_hub_genesis)),
-	];
-	expected.sort_by_key(|(identifier, _)| format!("{identifier:?}"));
-	assert_eq!(served, expected);
-}
 use tempfile::tempdir;
 
 #[test]
diff --git a/rust/crates/truapi/Cargo.toml b/rust/crates/truapi/Cargo.toml
index 2fbc7229a7..956aae7278 100644
--- a/rust/crates/truapi/Cargo.toml
+++ b/rust/crates/truapi/Cargo.toml
@@ -37,6 +37,7 @@ runtime = [
     # only with codec's own serde support.
     "parity-scale-codec/serde",
     "dep:truapi-provider",
+    "dep:trinity-stack",
     "dep:futures-timer",
     "dep:scale-decode",
     "dep:frame-metadata",
@@ -105,6 +106,7 @@ hex = { workspace = true }
 parity-scale-codec = { workspace = true, features = ["derive"] }
 
 truapi-provider = { path = "../truapi-provider", default-features = false, optional = true }
+trinity-stack = { path = "../trinity-stack", optional = true }
 futures-timer = { workspace = true, optional = true }
 scale-decode = { workspace = true, features = ["derive"], optional = true }
 # Metadata decoding backs allowance registration, which both the native and the
diff --git a/rust/crates/truapi/RUNTIME.md b/rust/crates/truapi/RUNTIME.md
index 8cb73ae0f7..2a15a8b881 100644
--- a/rust/crates/truapi/RUNTIME.md
+++ b/rust/crates/truapi/RUNTIME.md
@@ -213,14 +213,26 @@ a compile error, not a runtime `Unavailable`.
 A local session's usernames come from the dotNS contracts on Asset Hub, read
 after activation. A name the host passes is shown until a record answers.
 
-`SigningHostConfig.network_suffix` is the network's bare dotNS TLD (`dot`,
-`paseo`, or `testnet`). The shell supplies it alongside the chain genesis hashes
-from the same network configuration used by wallet onboarding. It must match
-the People chain's `NetworkSuffix.NetworkSuffix`: reserved identities derive
-under `uid.<suffix>` and `peopl.<suffix>`, while the chain uses that suffix for
-proof contexts. Configuration keeps local activation and key derivation
-available offline. The core validates supported suffixes but does not
-automatically check that the configured suffix matches the chain.
+### Stack
+
+Both host configs carry a `Stack`, the core's only source of chain
+configuration: the People, Bulletin, Asset Hub and relay genesis hashes, the
+network `get_chain_info` reports, and the dotNS TLD. A native or browser shell
+passes the stack's pointer (`polkadotapp://stack?key=0x…&url=…`), the signed
+descriptor its build bundles, and whether the build allows reserved values;
+`Stack::bundled` verifies the copy against the pointer's key. It refuses a
+pointer without a key, a descriptor without a People or Bulletin chain, a TLD
+the core does not serve dotNS under, and Polkadot's genesis hashes or the `dot`
+TLD on a stack the build does not allow them on. A Rust host that resolved a
+stack itself, such as the CLI, builds one with `Stack::new` under the same
+rules, and a test-host browser bundle takes one built from its parts as
+`runtimeConfig.testStack`.
+
+The TLD must match the People chain's `NetworkSuffix.NetworkSuffix`: reserved
+identities derive under `uid.<tld>` and `peopl.<tld>`, while the chain uses that
+suffix for proof contexts. Reading it from the bundled copy keeps local
+activation and key derivation available offline. The core does not yet check
+the descriptor against the live chains, and does not fetch newer copies.
 
 ### Core database
 
diff --git a/rust/crates/truapi/src/host_core.rs b/rust/crates/truapi/src/host_core.rs
index 6f21881914..c036268d1a 100644
--- a/rust/crates/truapi/src/host_core.rs
+++ b/rust/crates/truapi/src/host_core.rs
@@ -239,9 +239,7 @@ impl PairingHostRuntime {
 		let services = RuntimeServices::with_chat_platform(
 			platform,
 			config.host.host_info.clone(),
-			config.people_chain_genesis_hash,
-			config.bulletin_chain_genesis_hash,
-			config.asset_hub_chain_genesis_hash,
+			config.stack.clone(),
 			spawner.clone(),
 			chat_platform,
 		);
@@ -724,9 +722,7 @@ impl SigningHostRuntime {
 		let services = RuntimeServices::with_chat_platform(
 			platform,
 			config.host.host_info.clone(),
-			config.people_chain_genesis_hash,
-			config.bulletin_chain_genesis_hash,
-			config.asset_hub_chain_genesis_hash,
+			config.stack.clone(),
 			spawner,
 			chat_platform,
 		);
@@ -738,11 +734,11 @@ impl SigningHostRuntime {
 			// indistinguishable from an ungranted read. Only as visible as the
 			// host's log level, which defaults to `ERROR`.
 			warn!(
-				"no Asset Hub configured: no product manifest will resolve, so \
+				"the stack has no Asset Hub: no product manifest will resolve, so \
                  every cross-product grant not already cached is refused"
 			);
 		}
-		let signing_host = SigningHostRole::new(services.clone(), config.network_suffix);
+		let signing_host = SigningHostRole::new(services.clone());
 		let sso_responder = SsoResponderService::new(services.clone(), signing_host.clone());
 		Self {
 			image_loader: crate::image_loader::ImageLoader::new(
diff --git a/rust/crates/truapi/src/host_core/tests.rs b/rust/crates/truapi/src/host_core/tests.rs
index adb91624bf..e290571adc 100644
--- a/rust/crates/truapi/src/host_core/tests.rs
+++ b/rust/crates/truapi/src/host_core/tests.rs
@@ -44,11 +44,7 @@ fn activated_signing_runtime(platform: Arc<StubPlatform>) -> SigningHostRuntime
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		// Distinct from its siblings so a transposition stays visible.
-		[0xcc; 32],
-		"testnet".to_string(),
+		crate::test_support::test_stack("testnet", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 	)
 	.expect("signing host config is valid");
 	let runtime = SigningHostRuntime::new(platform, config, test_spawner());
@@ -1571,10 +1567,7 @@ fn the_device_pairing_observer_is_installed_once() {
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		[0xcc; 32],
-		"paseo".to_string(),
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 	)
 	.expect("signing host config is valid");
 	let runtime =
@@ -1599,10 +1592,7 @@ fn test_signing_runtime() -> (SigningHostRuntime, Arc<StubPlatform>) {
 	let config = SigningHostConfig::new(
 		host,
 		PlatformInfo::default(),
-		genesis.0,
-		genesis.1,
-		genesis.2,
-		"paseo".to_string(),
+		crate::test_support::test_stack("paseo", genesis.0, genesis.1, Some(genesis.2)),
 	)
 	.expect("signing host config is valid");
 	let platform = Arc::new(StubPlatform::default());
@@ -1724,10 +1714,7 @@ fn answer_sso_request_distinguishes_disconnect_from_ignorable_messages() {
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		[0xcc; 32],
-		"paseo".to_string(),
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 	)
 	.expect("signing host config is valid");
 	let runtime =
@@ -1771,10 +1758,7 @@ fn answer_sso_request_returns_a_correlated_response() {
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		[0xcc; 32],
-		"paseo".to_string(),
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 	)
 	.expect("signing host config is valid");
 	let runtime =
@@ -1891,7 +1875,9 @@ fn disconnect_paired_host_propagates_submission_failure() {
 
 /// Signing-host config carrying `asset_hub`, otherwise the shape every
 /// other signing test here uses.
-fn signing_config_with_asset_hub(asset_hub: [u8; 32]) -> crate::platform::SigningHostConfig {
+fn signing_config_with_asset_hub(
+	asset_hub: Option<[u8; 32]>,
+) -> crate::platform::SigningHostConfig {
 	use crate::platform::{HostInfo, PlatformInfo, SigningHostConfig};
 
 	SigningHostConfig::new(
@@ -1902,12 +1888,7 @@ fn signing_config_with_asset_hub(asset_hub: [u8; 32]) -> crate::platform::Signin
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		// Same-typed and positional, so a transposition only shows up if
-		// no two are equal.
-		[0xaa; 32],
-		[0xbb; 32],
-		asset_hub,
-		"paseo".to_string(),
+		crate::test_support::test_stack("paseo", [0xaa; 32], [0xbb; 32], asset_hub),
 	)
 	.expect("signing host config is valid")
 }
@@ -1919,7 +1900,7 @@ fn a_signing_host_runtime_carries_its_asset_hub_for_manifest_resolution() {
 	// consulted, which is why a seeded CLI looked healthy.
 	let runtime = SigningHostRuntime::new(
 		Arc::new(StubPlatform::default()),
-		signing_config_with_asset_hub([0xcc; 32]),
+		signing_config_with_asset_hub(Some([0xcc; 32])),
 		test_spawner(),
 	);
 	assert_eq!(
@@ -1943,9 +1924,7 @@ fn a_pairing_host_runtime_carries_its_asset_hub_too() {
 			platform: truapi::latest::HostPlatform::Web,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		[0xdd; 32],
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xdd; 32])),
 		"polkadotapp".to_string(),
 	)
 	.expect("pairing host config is valid");
@@ -1964,7 +1943,7 @@ fn an_all_zero_asset_hub_is_how_a_signing_host_says_it_has_none() {
 	// second sentinel crossing the boundary.
 	let runtime = SigningHostRuntime::new(
 		Arc::new(StubPlatform::default()),
-		signing_config_with_asset_hub([0; 32]),
+		signing_config_with_asset_hub(None),
 		test_spawner(),
 	);
 	// The hash is a constructor argument, so `None` here can only mean the
@@ -1985,9 +1964,7 @@ fn the_asset_hub_argument_reaches_the_asset_hub_slot() {
 			version: None,
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
-		[0xaa; 32],
-		[0xbb; 32],
-		[0xcc; 32],
+		crate::test_support::test_stack("paseo", [0xaa; 32], [0xbb; 32], Some([0xcc; 32])),
 		test_spawner(),
 	);
 	assert_eq!(
@@ -2007,7 +1984,7 @@ struct ManifestLookup {
 
 /// A cross-product storage read for `owner`, uncached, on a signing-role
 /// product runtime configured with `asset_hub`.
-fn signing_manifest_lookup_rpc(asset_hub: [u8; 32]) -> ManifestLookup {
+fn signing_manifest_lookup_rpc(asset_hub: Option<[u8; 32]>) -> ManifestLookup {
 	use truapi::{api::LocalStorage, versioned::local_storage::HostLocalStorageReadRequest};
 
 	// The stub serves no dotNS either way, so end the follow rather than
@@ -2046,7 +2023,7 @@ fn signing_manifest_lookup_rpc(asset_hub: [u8; 32]) -> ManifestLookup {
 fn a_signing_host_takes_a_manifest_miss_to_the_chain() {
 	// The refusal is identical either way, so whether the core asked the
 	// chain is the only observable difference.
-	let configured = signing_manifest_lookup_rpc([0xcc; 32]);
+	let configured = signing_manifest_lookup_rpc(Some([0xcc; 32]));
 	assert!(
 		!configured.rpc.is_empty(),
 		"a configured signing role resolves an uncached manifest over dotNS"
@@ -2061,7 +2038,7 @@ fn a_signing_host_takes_a_manifest_miss_to_the_chain() {
          Bulletin ([0xbb; 32])"
 	);
 
-	let unconfigured = signing_manifest_lookup_rpc([0; 32]);
+	let unconfigured = signing_manifest_lookup_rpc(None);
 	assert!(
 		unconfigured.rpc.is_empty(),
 		"a signing role with no Asset Hub refuses without touching the chain"
diff --git a/rust/crates/truapi/src/host_logic/features.rs b/rust/crates/truapi/src/host_logic/features.rs
index d38a9b5754..8d319cfb86 100644
--- a/rust/crates/truapi/src/host_logic/features.rs
+++ b/rust/crates/truapi/src/host_logic/features.rs
@@ -1,18 +1,12 @@
 //! Feature-detection delegation.
 //!
-//! `feature_supported` and `supported_chains` are platform syscalls: each
-//! host owns the set of chains it can service. This module is a thin shim
-//! that forwards through to [`crate::platform::Features`], plus the in-core
-//! RFC-0026 resolution that answers `get_chain_info` from the host's chain
-//! set so per-request semantics (ordering, `NotSupported`) stay core-owned.
+//! `feature_supported` is a platform syscall: each host owns the set of chains
+//! it can service. This module is a thin shim that forwards through to
+//! [`crate::platform::Features`]. `get_chain_info` is answered by the core
+//! from its [`crate::platform::Stack`] instead.
 
-use crate::platform::{Features, HostChainSet};
-use truapi::{
-	latest::{
-		ChainIdentifier, RemoteChainInfoError, RemoteChainInfoRequest, RemoteChainInfoResponse,
-	},
-	v01::{GenericError, HostFeatureSupportedRequest, HostFeatureSupportedResponse},
-};
+use crate::platform::Features;
+use truapi::v01::{GenericError, HostFeatureSupportedRequest, HostFeatureSupportedResponse};
 
 /// Forward a feature-support query to the platform implementation.
 pub async fn feature_supported<P: Features + ?Sized>(
@@ -22,78 +16,5 @@ pub async fn feature_supported<P: Features + ?Sized>(
 	platform.feature_supported(request).await
 }
 
-/// Fetch the host's chain set from the platform implementation.
-pub async fn supported_chains<P: Features + ?Sized>(
-	platform: &P,
-) -> Result<HostChainSet, GenericError> {
-	platform.supported_chains().await
-}
-
-/// The genesis hash the host serves for `chain`, or `None` when it serves no
-/// such chain.
-///
-/// Runtime code that needs to talk to a chain by role resolves it here rather
-/// than carrying a configured hash, so a chain the host does not serve is a
-/// missing entry instead of a connection to the wrong chain.
-pub fn genesis_for(set: &HostChainSet, chain: ChainIdentifier) -> Option<[u8; 32]> {
-	set.chains
-		.iter()
-		.find(|entry| entry.identifier == chain)
-		.map(|entry| entry.genesis_hash)
-}
-
-/// Resolve a `get_chain_info` request against the host's chain set: the
-/// requested identifier's genesis hash plus the host's network, echoing the
-/// identifier, or `NotSupported` when the host does not serve it.
-pub fn chain_info(
-	set: &HostChainSet,
-	request: &RemoteChainInfoRequest,
-) -> Result<RemoteChainInfoResponse, RemoteChainInfoError> {
-	genesis_for(set, request.chain)
-		.map(|genesis_hash| RemoteChainInfoResponse {
-			network: set.network.clone(),
-			chain: request.chain,
-			genesis_hash,
-		})
-		.ok_or(RemoteChainInfoError::NotSupported)
-}
-
 #[cfg(test)]
 mod tests;
-
-#[cfg(test)]
-mod genesis_lookup_tests {
-	use super::*;
-	use crate::platform::HostChainEntry;
-
-	fn set() -> HostChainSet {
-		HostChainSet {
-			network: "paseo".to_string(),
-			chains: vec![HostChainEntry {
-				identifier: ChainIdentifier::AssetHub,
-				genesis_hash: [0xab; 32],
-			}],
-		}
-	}
-
-	/// A chain the host does not serve is absent, not a different chain's hash.
-	#[test]
-	fn only_served_chains_resolve() {
-		assert_eq!(genesis_for(&set(), ChainIdentifier::AssetHub), Some([0xab; 32]));
-		assert_eq!(genesis_for(&set(), ChainIdentifier::Bulletin), None);
-	}
-
-	/// `chain_info` answers from the same lookup, so the product-facing method and
-	/// in-core callers cannot disagree about what the host serves.
-	#[test]
-	fn chain_info_agrees_with_the_lookup() {
-		let set = set();
-		for chain in [ChainIdentifier::AssetHub, ChainIdentifier::People] {
-			let request = RemoteChainInfoRequest { chain };
-			assert_eq!(
-				chain_info(&set, &request).ok().map(|info| info.genesis_hash),
-				genesis_for(&set, chain),
-			);
-		}
-	}
-}
diff --git a/rust/crates/truapi/src/host_logic/features/tests.rs b/rust/crates/truapi/src/host_logic/features/tests.rs
index f9b9c68a63..8d907ab56c 100644
--- a/rust/crates/truapi/src/host_logic/features/tests.rs
+++ b/rust/crates/truapi/src/host_logic/features/tests.rs
@@ -1,16 +1,4 @@
 use super::*;
-use crate::platform::HostChainEntry;
-use truapi::latest::ChainIdentifier;
-
-fn paseo_set() -> HostChainSet {
-	HostChainSet {
-		network: "paseo".to_string(),
-		chains: vec![
-			HostChainEntry { identifier: ChainIdentifier::AssetHub, genesis_hash: [0xaa; 32] },
-			HostChainEntry { identifier: ChainIdentifier::People, genesis_hash: [0xbb; 32] },
-		],
-	}
-}
 
 struct AlwaysSupported;
 
@@ -23,10 +11,6 @@ impl Features for AlwaysSupported {
 		assert!(matches!(request, HostFeatureSupportedRequest::Chain { .. }));
 		Ok(HostFeatureSupportedResponse { supported: true })
 	}
-
-	async fn supported_chains(&self) -> Result<HostChainSet, GenericError> {
-		Ok(paseo_set())
-	}
 }
 
 struct AlwaysUnsupported;
@@ -40,10 +24,6 @@ impl Features for AlwaysUnsupported {
 		assert!(matches!(request, HostFeatureSupportedRequest::Chain { .. }));
 		Ok(HostFeatureSupportedResponse { supported: false })
 	}
-
-	async fn supported_chains(&self) -> Result<HostChainSet, GenericError> {
-		Err(GenericError { reason: "no chains".to_string() })
-	}
 }
 
 fn req() -> HostFeatureSupportedRequest {
@@ -61,31 +41,3 @@ fn delegates_unsupported_to_platform() {
 	let resp = futures::executor::block_on(feature_supported(&AlwaysUnsupported, req())).unwrap();
 	assert!(!resp.supported);
 }
-
-#[test]
-fn delegates_supported_chains_to_platform() {
-	let set = futures::executor::block_on(supported_chains(&AlwaysSupported)).unwrap();
-	assert_eq!(set, paseo_set());
-}
-
-#[test]
-fn surfaces_supported_chains_platform_error() {
-	let err = futures::executor::block_on(supported_chains(&AlwaysUnsupported)).unwrap_err();
-	assert_eq!(err.reason, "no chains");
-}
-
-#[test]
-fn resolves_identifier_and_echoes_it() {
-	let request = RemoteChainInfoRequest { chain: ChainIdentifier::People };
-	let response = chain_info(&paseo_set(), &request).unwrap();
-	assert_eq!(response.network, "paseo");
-	assert_eq!(response.chain, ChainIdentifier::People);
-	assert_eq!(response.genesis_hash, [0xbb; 32]);
-}
-
-#[test]
-fn unserved_identifier_is_not_supported() {
-	let request = RemoteChainInfoRequest { chain: ChainIdentifier::Bulletin };
-	let err = chain_info(&paseo_set(), &request).unwrap_err();
-	assert_eq!(err, RemoteChainInfoError::NotSupported);
-}
diff --git a/rust/crates/truapi/src/host_logic/product_account.rs b/rust/crates/truapi/src/host_logic/product_account.rs
index 1f8a535c7f..3254d12f22 100644
--- a/rust/crates/truapi/src/host_logic/product_account.rs
+++ b/rust/crates/truapi/src/host_logic/product_account.rs
@@ -6,7 +6,7 @@
 //! Reserved built-ins additionally pin the `uid.<suffix>` identity account and
 //! the `peopl.<suffix>` full/lite ring-VRF keyed-hash paths used by pairing
 //! attestation, where `<suffix>` is the network's dotNS TLD (`dot`, `paseo`,
-//! `testnet`) from [`crate::platform::SigningHostConfig::network_suffix`]. The
+//! `testnet`) from [`crate::platform::Stack::tld`]. The
 //! People chain scopes its proof contexts with the same suffix, so one
 //! network has one person per seed. RFC-0024 operational key selection comes
 //! from the registry.
diff --git a/rust/crates/truapi/src/host_logic/sso/pairing/tests.rs b/rust/crates/truapi/src/host_logic/sso/pairing/tests.rs
index 62c6c7c540..c5041dec7a 100644
--- a/rust/crates/truapi/src/host_logic/sso/pairing/tests.rs
+++ b/rust/crates/truapi/src/host_logic/sso/pairing/tests.rs
@@ -23,9 +23,7 @@ fn runtime_config() -> PairingHostConfig {
 			platform: truapi::latest::HostPlatform::Web,
 		},
 		PlatformInfo { kind: Some("Firefox".to_string()), version: Some("192.32".to_string()) },
-		[0; 32],
-		[0xbb; 32],
-		[0xcc; 32],
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 		"polkadotapp".to_string(),
 	)
 	.expect("test runtime config is valid")
diff --git a/rust/crates/truapi/src/image_loader/tests.rs b/rust/crates/truapi/src/image_loader/tests.rs
index 6971cbdfa5..7c0abc18f5 100644
--- a/rust/crates/truapi/src/image_loader/tests.rs
+++ b/rust/crates/truapi/src/image_loader/tests.rs
@@ -40,9 +40,7 @@ fn image_loader(platform: Arc<StubPlatform>, timer: Arc<ManualTimer>) -> ImageLo
 			version: None,
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
-		[1; 32],
-		BULLETIN_GENESIS,
-		[3; 32],
+		crate::test_support::test_stack("paseo", [1; 32], BULLETIN_GENESIS, Some([3; 32])),
 		test_spawner(),
 	);
 	ImageLoader::new(services, timer)
diff --git a/rust/crates/truapi/src/lib.rs b/rust/crates/truapi/src/lib.rs
index e25661378d..ad14f4a67b 100644
--- a/rust/crates/truapi/src/lib.rs
+++ b/rust/crates/truapi/src/lib.rs
@@ -871,6 +871,8 @@ mod runtime;
 #[cfg(feature = "runtime")]
 mod session_usernames;
 #[cfg(feature = "runtime")]
+mod stack;
+#[cfg(feature = "runtime")]
 mod stream_extensions;
 #[cfg(feature = "runtime")]
 pub mod subscription;
diff --git a/rust/crates/truapi/src/markers.rs b/rust/crates/truapi/src/markers.rs
index 3c856c2ccf..0a56e76d36 100644
--- a/rust/crates/truapi/src/markers.rs
+++ b/rust/crates/truapi/src/markers.rs
@@ -143,9 +143,6 @@ markers! {
 	/// The host was asked whether it supports a feature. Detail names it.
 	NATIVE_FEATURE_SUPPORTED = "truapi.native.callback.feature_supported" => Local;
 
-	/// The host was asked which chains it supports.
-	NATIVE_SUPPORTED_CHAINS = "truapi.native.callback.supported_chains" => Local;
-
 	/// The host was asked for a chain's transaction extension versions.
 	NATIVE_TRANSACTION_EXTENSION_VERSIONS = "truapi.native.callback.transaction_extension_versions" => Local;
 
diff --git a/rust/crates/truapi/src/native.rs b/rust/crates/truapi/src/native.rs
index 3773f4e0cc..173e323ec1 100644
--- a/rust/crates/truapi/src/native.rs
+++ b/rust/crates/truapi/src/native.rs
@@ -42,7 +42,9 @@ pub use callbacks::{
 	NativeFundingCallbacks, NativeGameCallbacks, NativePaymentCallbacks, NativeScannerCallbacks,
 	NativeTopUpCallbacks,
 };
-pub use config::{HostRuntimeConfig, NativeRuntimeConfigError, ProductExecutionConfig};
+pub use config::{
+	BundledStack, HostRuntimeConfig, NativeRuntimeConfigError, ProductExecutionConfig,
+};
 pub use errors::{
 	HostRejection, NativeChatFieldError, NativeCoreDatabaseError, NativeRendererError,
 };
diff --git a/rust/crates/truapi/src/native/callbacks.rs b/rust/crates/truapi/src/native/callbacks.rs
index 798b24c036..b0fa7472ea 100644
--- a/rust/crates/truapi/src/native/callbacks.rs
+++ b/rust/crates/truapi/src/native/callbacks.rs
@@ -153,11 +153,6 @@ pub trait HostCallbacks: Send + Sync {
 		request: latest::HostFeatureSupportedRequest,
 	) -> Result<bool, HostRejection>;
 
-	/// Enumerate the chains this host serves (RFC 0026): its environment plus
-	/// one entry per chain role. Invoked on the dispatcher thread; must return
-	/// promptly.
-	fn supported_chains(&self) -> Result<crate::platform::HostChainSet, HostRejection>;
-
 	/// The chains the host builds as V5 general transactions, each with its
 	/// transaction extension pipeline. A chain not listed is built as V4.
 	async fn transaction_extension_versions(
diff --git a/rust/crates/truapi/src/native/config.rs b/rust/crates/truapi/src/native/config.rs
index dcad20f825..562ef0f760 100644
--- a/rust/crates/truapi/src/native/config.rs
+++ b/rust/crates/truapi/src/native/config.rs
@@ -3,7 +3,7 @@ use std::path::PathBuf;
 use crate::{
 	platform::{
 		ExecutableKind, HostInfo, PlatformInfo, ProductContext, ProductId,
-		RuntimeConfigValidationError, SigningHostConfig,
+		RuntimeConfigValidationError, SigningHostConfig, Stack,
 	},
 	pocket_cards::PinnedPocketCard,
 };
@@ -26,25 +26,10 @@ pub struct HostRuntimeConfig {
 	/// Optional platform/browser version shown by the wallet during SSO pairing.
 	#[uniffi(default)]
 	pub platform_version: Option<String>,
-	/// People-chain genesis hash. Must be exactly 32 bytes.
-	pub people_chain_genesis_hash: Vec<u8>,
-	/// Bulletin-chain genesis hash. Must be exactly 32 bytes.
-	pub bulletin_chain_genesis_hash: Vec<u8>,
-	/// Asset Hub genesis hash, where the dotNS contracts are deployed. Must be
-	/// exactly 32 bytes.
-	///
-	/// Product manifests are read from dotNS, so this is what makes a
-	/// `trustedProducts` grant resolvable. 32 zero bytes says this host has no
-	/// Asset Hub; grants already in the manifest cache stay honoured until they
-	/// expire.
-	pub asset_hub_chain_genesis_hash: Vec<u8>,
-	/// The network's dotNS TLD without the leading dot (`dot`, `paseo`,
-	/// `testnet`). The wallet's reserved identities are derived under it:
-	/// `uid.<suffix>` for the identity account, `peopl.<suffix>` for the person
-	/// ring-VRF keys. Read it from the network the host is configured for, the
-	/// way the host's own onboarding does; a wrong value derives a different
-	/// person from the same seed.
-	pub network_suffix: String,
+	/// The stack the host build runs, which every chain the core uses, the
+	/// network `get_chain_info` reports, and the TLD the wallet's reserved
+	/// identities derive under all come from.
+	pub stack: BundledStack,
 	/// Existing, writable directory for core-owned databases, kept out of
 	/// device backups. The runtime opens its database there at startup.
 	pub database_directory: String,
@@ -61,6 +46,21 @@ pub struct HostRuntimeConfig {
 	pub local_session_lite_username: Option<String>,
 }
 
+/// The stack a host build ships: its pointer, the descriptor copy the build
+/// verified, and whether the build lets it use Polkadot's reserved values.
+#[derive(Clone, uniffi::Record)]
+pub struct BundledStack {
+	/// The stack's link, `polkadotapp://stack?key=0x…&url=…`. It must carry a
+	/// key.
+	pub pointer: String,
+	/// The bundled descriptor's bytes, as served: a signed envelope that
+	/// verifies under the pointer's key.
+	pub descriptor: Vec<u8>,
+	/// Whether this build may run a stack that uses Polkadot's genesis hashes
+	/// or the `dot` TLD. Only a Polkadot or Polkadot-fork build sets it.
+	pub allows_reserved_values: bool,
+}
+
 /// Trusted identity attached by a native host to one executable connection.
 #[derive(Clone, uniffi::Record)]
 pub struct ProductExecutionConfig {
@@ -120,13 +120,6 @@ impl From<RuntimeConfigValidationError> for NativeRuntimeConfigError {
 	}
 }
 
-/// A 32-byte genesis hash handed over as bytes, or the error naming `field`.
-fn genesis_hash(field: &str, bytes: &[u8]) -> Result<[u8; 32], NativeRuntimeConfigError> {
-	bytes.try_into().map_err(|_| NativeRuntimeConfigError::Invalid {
-		reason: format!("{field} must be exactly 32 bytes, got {}", bytes.len()),
-	})
-}
-
 /// The platform products see in `System::host_info`. The native library ships
 /// only inside iOS and Android apps, so the target decides it.
 pub fn native_host_platform() -> HostPlatform {
@@ -143,12 +136,9 @@ impl TryFrom<HostRuntimeConfig> for NativeResolvedHostRuntimeConfig {
 	type Error = NativeRuntimeConfigError;
 
 	fn try_from(config: HostRuntimeConfig) -> Result<Self, Self::Error> {
-		let people_chain_genesis_hash =
-			genesis_hash("people_chain_genesis_hash", &config.people_chain_genesis_hash)?;
-		let bulletin_chain_genesis_hash =
-			genesis_hash("bulletin_chain_genesis_hash", &config.bulletin_chain_genesis_hash)?;
-		let asset_hub_chain_genesis_hash =
-			genesis_hash("asset_hub_chain_genesis_hash", &config.asset_hub_chain_genesis_hash)?;
+		let BundledStack { pointer, descriptor, allows_reserved_values } = config.stack;
+		let stack = Stack::bundled(&pointer, &descriptor, allows_reserved_values)
+			.map_err(|error| NativeRuntimeConfigError::Invalid { reason: error.to_string() })?;
 		let signing = SigningHostConfig::new(
 			HostInfo {
 				name: config.host_name,
@@ -157,10 +147,7 @@ impl TryFrom<HostRuntimeConfig> for NativeResolvedHostRuntimeConfig {
 				platform: native_host_platform(),
 			},
 			PlatformInfo { kind: config.platform_type, version: config.platform_version },
-			people_chain_genesis_hash,
-			bulletin_chain_genesis_hash,
-			asset_hub_chain_genesis_hash,
-			config.network_suffix,
+			stack,
 		)?;
 		Ok(Self {
 			signing,
diff --git a/rust/crates/truapi/src/native/platform.rs b/rust/crates/truapi/src/native/platform.rs
index 6e46150919..8053934aa4 100644
--- a/rust/crates/truapi/src/native/platform.rs
+++ b/rust/crates/truapi/src/native/platform.rs
@@ -268,13 +268,6 @@ impl Features for CallbackPlatform {
 		let supported = self.callbacks.feature_supported(request).await?;
 		Ok(v01::HostFeatureSupportedResponse { supported })
 	}
-
-	async fn supported_chains(&self) -> Result<crate::platform::HostChainSet, v01::GenericError> {
-		self.callbacks
-			.on_core_log(markers::NATIVE_SUPPORTED_CHAINS.target.to_string(), String::new());
-
-		self.callbacks.supported_chains().map_err(v01::GenericError::from)
-	}
 }
 
 #[async_trait::async_trait]
diff --git a/rust/crates/truapi/src/native/tests.rs b/rust/crates/truapi/src/native/tests.rs
index 7066ad1861..78e7285f99 100644
--- a/rust/crates/truapi/src/native/tests.rs
+++ b/rust/crates/truapi/src/native/tests.rs
@@ -342,9 +342,6 @@ impl HostCallbacks for EventCallbacks {
 	) -> Result<bool, HostRejection> {
 		Ok(false)
 	}
-	fn supported_chains(&self) -> Result<crate::platform::HostChainSet, HostRejection> {
-		Ok(crate::platform::HostChainSet { network: "paseo".to_string(), chains: Vec::new() })
-	}
 
 	async fn transaction_extension_versions(
 		&self,
@@ -505,10 +502,12 @@ pub fn native_host_runtime_config() -> HostRuntimeConfig {
 		host_version: None,
 		platform_type: None,
 		platform_version: None,
-		people_chain_genesis_hash: vec![0xa2; 32],
-		bulletin_chain_genesis_hash: vec![0xbb; 32],
-		asset_hub_chain_genesis_hash: vec![0xcc; 32],
-		network_suffix: "paseo".to_string(),
+		stack: native_bundled_stack(&crate::test_support::test_descriptor(
+			"paseo",
+			[0xa2; 32],
+			[0xbb; 32],
+			Some([0xcc; 32]),
+		)),
 		// Every runtime opens its own database; the directory is left for the
 		// OS to clean so the fixture can stay a plain value.
 		database_directory: tempfile::tempdir().unwrap().keep().to_string_lossy().into_owned(),
@@ -518,6 +517,12 @@ pub fn native_host_runtime_config() -> HostRuntimeConfig {
 	}
 }
 
+/// `descriptor` signed, as a native host bundles it.
+fn native_bundled_stack(descriptor: &serde_json::Value) -> crate::native::BundledStack {
+	let (pointer, descriptor) = crate::test_support::sign_test_descriptor(descriptor);
+	crate::native::BundledStack { pointer, descriptor, allows_reserved_values: false }
+}
+
 pub fn native_execution_config(
 	product_id: &str,
 	execution_kind: ExecutableKind,
@@ -1776,80 +1781,76 @@ fn runtime_config_reports_the_platform_the_library_was_built_for() {
 }
 
 #[test]
-fn runtime_config_rejects_wrong_size_genesis_hash() {
-	let err = NativeResolvedHostRuntimeConfig::try_from(HostRuntimeConfig {
-		people_chain_genesis_hash: vec![0; 31],
-		..native_host_runtime_config()
-	})
-	.unwrap_err();
-
-	assert_eq!(
-		err,
-		NativeRuntimeConfigError::Invalid {
-			reason: "people_chain_genesis_hash must be exactly 32 bytes, got 31".to_string(),
-		}
-	);
-}
-
-#[test]
-fn each_configured_genesis_hash_reaches_its_own_field() {
-	// Three adjacent `Vec<u8>` feeding a positional constructor:
-	// transposing any two compiles and, without this, passes.
+fn each_descriptor_chain_reaches_its_own_role() {
 	let resolved = NativeResolvedHostRuntimeConfig::try_from(HostRuntimeConfig {
-		people_chain_genesis_hash: vec![0xa1; 32],
-		bulletin_chain_genesis_hash: vec![0xb2; 32],
-		asset_hub_chain_genesis_hash: vec![0xc3; 32],
+		stack: native_bundled_stack(&crate::test_support::test_descriptor(
+			"paseo",
+			[0xa1; 32],
+			[0xb2; 32],
+			Some([0xc3; 32]),
+		)),
 		..native_host_runtime_config()
 	})
 	.expect("config is valid");
 
 	assert_eq!(
-		(
-			resolved.signing.people_chain_genesis_hash,
-			resolved.signing.bulletin_chain_genesis_hash,
-			resolved.signing.asset_hub_chain_genesis_hash,
-		),
-		([0xa1; 32], [0xb2; 32], [0xc3; 32]),
+		resolved.signing.stack.chains(),
+		&crate::platform::StackChains {
+			relay: Some([0x01; 32]),
+			asset_hub: Some([0xc3; 32]),
+			people: [0xa1; 32],
+			bulletin: [0xb2; 32],
+		},
 	);
 }
 
 #[test]
-fn a_wrong_size_asset_hub_genesis_hash_is_rejected_as_its_own_field() {
-	// An empty vec must be an error, never a silent all-zero "no Asset
-	// Hub".
-	for len in [0usize, 31, 33] {
-		let err = NativeResolvedHostRuntimeConfig::try_from(HostRuntimeConfig {
-			asset_hub_chain_genesis_hash: vec![0; len],
-			..native_host_runtime_config()
-		})
-		.unwrap_err();
-
-		assert_eq!(
-			err,
-			NativeRuntimeConfigError::Invalid {
-				reason: format!("asset_hub_chain_genesis_hash must be exactly 32 bytes, got {len}"),
-			}
-		);
-	}
-}
-
-#[test]
-fn runtime_config_rejects_a_network_suffix_that_is_not_a_bare_tld() {
-	// The suffix ends every reserved derivation (`peopl.<suffix>`), so a
-	// shell passing the dotted form would silently derive a stranger.
+fn runtime_config_refuses_a_stack_pointer_without_a_key() {
+	// The host refreshes its stack unseen, so only a signed stack may start.
+	let mut stack = native_host_runtime_config().stack;
+	stack.pointer = "polkadotapp://stack?url=https%3A%2F%2Fstack.test.invalid%2Fstack.json".into();
 	let err = NativeResolvedHostRuntimeConfig::try_from(HostRuntimeConfig {
-		network_suffix: ".paseo".to_string(),
+		stack,
 		..native_host_runtime_config()
 	})
 	.unwrap_err();
+
 	assert_eq!(
 		err,
 		NativeRuntimeConfigError::Invalid {
-			reason: r#"network_suffix must be a supported dotNS TLD, got ".paseo""#.to_string(),
+			reason: crate::platform::StackError::Unsigned.to_string()
 		}
 	);
 }
 
+#[test]
+fn runtime_config_passes_the_reserved_values_flag_through() {
+	// A testnet build must not run a stack on `dot`; a Polkadot build may.
+	let mut stack = native_bundled_stack(&crate::test_support::test_descriptor(
+		"dot", [0xa1; 32], [0xb2; 32], None,
+	));
+	let refused = NativeResolvedHostRuntimeConfig::try_from(HostRuntimeConfig {
+		stack: stack.clone(),
+		..native_host_runtime_config()
+	});
+	stack.allows_reserved_values = true;
+	let allowed = NativeResolvedHostRuntimeConfig::try_from(HostRuntimeConfig {
+		stack,
+		..native_host_runtime_config()
+	});
+
+	assert_eq!(
+		(refused.err(), allowed.map(|resolved| resolved.signing.stack.tld().to_owned()).ok()),
+		(
+			Some(NativeRuntimeConfigError::Invalid {
+				reason: "stack uses Polkadot's reserved tld dot, which this build does not allow"
+					.to_string(),
+			}),
+			Some("dot".to_string()),
+		),
+	);
+}
+
 /// The app passes a product id as a string, and UniFFI parses it while
 /// converting the call's arguments, so an execution can only open under a
 /// valid id.
@@ -2023,9 +2024,6 @@ fn start_ws_bridge_twice_returns_already_running() {
 		) -> Result<bool, HostRejection> {
 			Ok(false)
 		}
-		fn supported_chains(&self) -> Result<crate::platform::HostChainSet, HostRejection> {
-			Ok(crate::platform::HostChainSet { network: "paseo".to_string(), chains: Vec::new() })
-		}
 
 		async fn transaction_extension_versions(
 			&self,
@@ -2215,9 +2213,6 @@ fn pending_permission_decision_does_not_stall_bridge() {
 		) -> Result<bool, HostRejection> {
 			Ok(true)
 		}
-		fn supported_chains(&self) -> Result<crate::platform::HostChainSet, HostRejection> {
-			Ok(crate::platform::HostChainSet { network: "paseo".to_string(), chains: Vec::new() })
-		}
 
 		async fn transaction_extension_versions(
 			&self,
diff --git a/rust/crates/truapi/src/native/ws_bridge/tests.rs b/rust/crates/truapi/src/native/ws_bridge/tests.rs
index c666dd48a4..4b0e0ffe09 100644
--- a/rust/crates/truapi/src/native/ws_bridge/tests.rs
+++ b/rust/crates/truapi/src/native/ws_bridge/tests.rs
@@ -26,10 +26,7 @@ fn runtime_factory_for(platform: Arc<StubPlatform>) -> Arc<dyn WsProductRuntimeF
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		[0xcc; 32],
-		"paseo".to_string(),
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 	)
 	.expect("test signing host config is valid");
 	let runtime = Arc::new(SigningHostRuntime::new(platform, config, test_spawner()));
diff --git a/rust/crates/truapi/src/platform.rs b/rust/crates/truapi/src/platform.rs
index d205353e8d..89e81935f0 100644
--- a/rust/crates/truapi/src/platform.rs
+++ b/rust/crates/truapi/src/platform.rs
@@ -31,26 +31,26 @@ pub use crate::{
 	product_id::{
 		PRODUCT_ID_MAX_BYTES, ProductId, ProductIdError, REMOTE_PERMISSION_TRUSTED_LABELS,
 	},
+	stack::{Stack, StackChains, StackError},
 };
 
 use truapi::{
 	latest::{
-		AllocatableResource, ChainIdentifier, ChatAction, ChatActions, ChatCustomMessage, ChatFile,
-		ChatMedia, ChatMessageContent, ChatReaction, ChatRichText, CodeFormat, FundingDirection,
-		FundingQuote, FundingQuoteRefusal, GenericError, HostChatCreateRoomError,
-		HostChatCreateRoomRequest, HostChatCreateRoomResponse, HostChatListSubscribeItem,
-		HostChatPostMessageError, HostChatPostMessageRequest, HostChatPostMessageResponse,
-		HostChatRegisterBotError, HostChatRegisterBotRequest, HostChatRegisterBotResponse,
-		HostChatSetRoomFooterRequest, HostDevicePermissionRequest, HostFeatureSupportedRequest,
-		HostFeatureSupportedResponse, HostFundingStatusSubscribeItem, HostLocalStorageChangeItem,
-		HostLocaleSubscribeItem, HostNavigateToError, HostPaymentBalanceSubscribeError,
-		HostPaymentBalanceSubscribeItem, HostPaymentError, HostPaymentRequest,
-		HostPaymentStatusSubscribeError, HostPaymentStatusSubscribeItem, HostPaymentTopUpError,
-		HostPaymentTopUpRequest, HostPaymentTopUpStatusSubscribeError,
-		HostPaymentTopUpStatusSubscribeItem, HostPlatform, HostPocketListSubscribeItem,
-		HostPocketRemoveCardError, HostPocketRemoveCardRequest, HostPushNotificationRequest,
-		HostPushNotificationResponse, HostScannerScanRequest, HostSignPayloadRequest,
-		HostSignPayloadWithLegacyAccountRequest, HostSignRawRequest,
+		AllocatableResource, ChatAction, ChatActions, ChatCustomMessage, ChatFile, ChatMedia,
+		ChatMessageContent, ChatReaction, ChatRichText, CodeFormat, FundingDirection, FundingQuote,
+		FundingQuoteRefusal, GenericError, HostChatCreateRoomError, HostChatCreateRoomRequest,
+		HostChatCreateRoomResponse, HostChatListSubscribeItem, HostChatPostMessageError,
+		HostChatPostMessageRequest, HostChatPostMessageResponse, HostChatRegisterBotError,
+		HostChatRegisterBotRequest, HostChatRegisterBotResponse, HostChatSetRoomFooterRequest,
+		HostDevicePermissionRequest, HostFeatureSupportedRequest, HostFeatureSupportedResponse,
+		HostFundingStatusSubscribeItem, HostLocalStorageChangeItem, HostLocaleSubscribeItem,
+		HostNavigateToError, HostPaymentBalanceSubscribeError, HostPaymentBalanceSubscribeItem,
+		HostPaymentError, HostPaymentRequest, HostPaymentStatusSubscribeError,
+		HostPaymentStatusSubscribeItem, HostPaymentTopUpError, HostPaymentTopUpRequest,
+		HostPaymentTopUpStatusSubscribeError, HostPaymentTopUpStatusSubscribeItem, HostPlatform,
+		HostPocketListSubscribeItem, HostPocketRemoveCardError, HostPocketRemoveCardRequest,
+		HostPushNotificationRequest, HostPushNotificationResponse, HostScannerScanRequest,
+		HostSignPayloadRequest, HostSignPayloadWithLegacyAccountRequest, HostSignRawRequest,
 		HostSignRawWithLegacyAccountRequest, HostThemeSubscribeItem,
 		HostWorkerBeginOperationResponse, HostWorkerOperationError, LegacyAccountTxPayload,
 		NftPurseOwner, ProductAccountId, ProductAccountTxPayload, ProductProofContext,
@@ -79,17 +79,12 @@ pub struct PairingHostConfig {
 	/// Host-spec B.1.3 defines the host metadata consumed by the signing host:
 	/// <https://github.com/paritytech/host-spec/blob/adb3989208ae1c2107dbf0159611353e6989422c/spec/B-inter-host.md?plain=1#L48-L60>
 	pub host: HostIdentity,
-	/// People-chain genesis hash used for statement-store SSO.
-	pub people_chain_genesis_hash: [u8; 32],
-	/// Bulletin-chain genesis hash used for in-core preimage submission.
-	pub bulletin_chain_genesis_hash: [u8; 32],
-	/// Asset Hub genesis hash. Session usernames and product manifests are
-	/// both read from the dotNS contracts deployed there, so without a usable
-	/// value no manifest resolves and every cross-product `trustedProducts`
-	/// grant not already cached is refused, indistinguishably from the other
-	/// product having granted nothing. All-zero says this host has no Asset
-	/// Hub.
-	pub asset_hub_chain_genesis_hash: [u8; 32],
+	/// The stack the host runs: People for statement-store SSO, Bulletin for
+	/// in-core preimage submission, and Asset Hub, whose dotNS contracts hold
+	/// session usernames and product manifests. Without an Asset Hub no
+	/// manifest resolves, and every cross-product `trustedProducts` grant not
+	/// already cached is refused.
+	pub stack: Stack,
 	/// Deeplink URI scheme used in pairing QR payloads, without `://`.
 	///
 	/// Host-spec L.2-L.3 define the `polkadotapp://pair` route and construction
@@ -106,22 +101,11 @@ pub struct SigningHostConfig {
 	/// parity with [`PairingHostConfig`] and for the future signer-side SSO
 	/// responder, which advertises host identity in handshake responses.
 	pub host: HostIdentity,
-	/// People-chain genesis hash used for statement-store product calls.
-	pub people_chain_genesis_hash: [u8; 32],
-	/// Bulletin-chain genesis hash used for in-core preimage submission.
-	pub bulletin_chain_genesis_hash: [u8; 32],
-	/// Asset Hub genesis hash the dotNS contracts are deployed on, used to
-	/// resolve the product manifests that carry `trustedProducts` grants.
-	///
-	/// All-zero says this host has no Asset Hub, which refuses every grant not
-	/// already in the manifest cache.
-	pub asset_hub_chain_genesis_hash: [u8; 32],
-	/// The network's dotNS TLD without the leading dot: `dot`, `paseo`,
-	/// `testnet`. Every reserved RFC-0022 identity the wallet derives ends in
-	/// it: the `uid.<suffix>` identity account and the `peopl.<suffix>` person
-	/// ring-VRF keys. Must match the People chain's
-	/// `NetworkSuffix.NetworkSuffix` value used for proof contexts.
-	pub network_suffix: String,
+	/// The stack the host runs. Its TLD must match the People chain's
+	/// `NetworkSuffix.NetworkSuffix`: every reserved RFC-0022 identity the
+	/// wallet derives ends in it, so a wrong one derives a different person
+	/// from the same seed.
+	pub stack: Stack,
 }
 
 /// Product identity attached to one product-facing TrUAPI connection.
@@ -222,9 +206,7 @@ impl PairingHostConfig {
 	pub fn new(
 		host_info: HostInfo,
 		platform_info: PlatformInfo,
-		people_chain_genesis_hash: [u8; 32],
-		bulletin_chain_genesis_hash: [u8; 32],
-		asset_hub_chain_genesis_hash: [u8; 32],
+		stack: Stack,
 		pairing_deeplink_scheme: String,
 	) -> Result<Self, RuntimeConfigValidationError> {
 		require_non_empty("pairing_deeplink_scheme", &pairing_deeplink_scheme)?;
@@ -235,9 +217,7 @@ impl PairingHostConfig {
 		}
 		let config = Self {
 			host: HostIdentity::new(host_info, platform_info)?,
-			people_chain_genesis_hash,
-			bulletin_chain_genesis_hash,
-			asset_hub_chain_genesis_hash,
+			stack,
 			pairing_deeplink_scheme,
 		};
 		Ok(config)
@@ -250,32 +230,12 @@ impl SigningHostConfig {
 	pub fn new(
 		host_info: HostInfo,
 		platform_info: PlatformInfo,
-		people_chain_genesis_hash: [u8; 32],
-		bulletin_chain_genesis_hash: [u8; 32],
-		asset_hub_chain_genesis_hash: [u8; 32],
-		network_suffix: String,
+		stack: Stack,
 	) -> Result<Self, RuntimeConfigValidationError> {
-		validate_network_suffix(&network_suffix)?;
-		Ok(Self {
-			host: HostIdentity::new(host_info, platform_info)?,
-			people_chain_genesis_hash,
-			bulletin_chain_genesis_hash,
-			asset_hub_chain_genesis_hash,
-			network_suffix,
-		})
+		Ok(Self { host: HostIdentity::new(host_info, platform_info)?, stack })
 	}
 }
 
-fn validate_network_suffix(network_suffix: &str) -> Result<(), RuntimeConfigValidationError> {
-	require_non_empty("network_suffix", network_suffix)?;
-	if !DOTNS_TLDS.contains(&network_suffix) {
-		return Err(RuntimeConfigValidationError::InvalidNetworkSuffix {
-			network_suffix: network_suffix.to_string(),
-		});
-	}
-	Ok(())
-}
-
 impl ProductContext {
 	/// A product context for an app.
 	pub fn new(product_id: ProductId) -> Self {
@@ -778,12 +738,6 @@ pub enum RuntimeConfigValidationError {
 	#[display("{_0}")]
 	#[from]
 	InvalidProductId(#[error(not(source))] ProductIdError),
-	/// Network suffix was not a supported dotNS TLD.
-	#[display("network_suffix must be a supported dotNS TLD, got {network_suffix:?}")]
-	InvalidNetworkSuffix {
-		/// Actual network suffix value.
-		network_suffix: String,
-	},
 }
 
 const PRODUCT_STORAGE_KEY_PREFIX: &str = "truapi:product-storage:v1:";
@@ -1130,27 +1084,6 @@ pub trait PairingHostAdmin: Send + Sync {
 	fn notify_session_store_changed(&self);
 }
 
-/// One chain a host serves: a protocol chain role mapped to the concrete
-/// chain of the host's configured environment.
-#[derive(Debug, Clone, PartialEq, Eq, Encode, Decode)]
-#[cfg_attr(not(target_arch = "wasm32"), derive(uniffi::Record))]
-pub struct HostChainEntry {
-	/// Protocol role this entry answers for.
-	pub identifier: ChainIdentifier,
-	/// Genesis hash identifying the chain in all chain-scoped calls.
-	pub genesis_hash: Bytes32,
-}
-
-/// The chain set a host serves: its environment plus one entry per chain role.
-#[derive(Debug, Clone, PartialEq, Eq, Encode, Decode)]
-#[cfg_attr(not(target_arch = "wasm32"), derive(uniffi::Record))]
-pub struct HostChainSet {
-	/// Ecosystem the host is configured for, e.g. "polkadot", "paseo".
-	pub network: String,
-	/// Chains this host serves, keyed by protocol role.
-	pub chains: Vec<HostChainEntry>,
-}
-
 /// Feature-support probing. The host answers whether it can service a given
 /// capability (currently scoped to per-chain support).
 #[async_trait::async_trait]
@@ -1160,10 +1093,6 @@ pub trait Features: Send + Sync {
 		&self,
 		request: HostFeatureSupportedRequest,
 	) -> Result<HostFeatureSupportedResponse, GenericError>;
-
-	/// Enumerate the chains this host serves (RFC 0026). The core resolves
-	/// `get_chain_info` requests against the returned set.
-	async fn supported_chains(&self) -> Result<HostChainSet, GenericError>;
 }
 
 /// A chain the host builds as V5 general transactions, and the transaction
diff --git a/rust/crates/truapi/src/platform/mock.rs b/rust/crates/truapi/src/platform/mock.rs
index 896a29d6c7..59363872ca 100644
--- a/rust/crates/truapi/src/platform/mock.rs
+++ b/rust/crates/truapi/src/platform/mock.rs
@@ -214,7 +214,7 @@ pub struct MockFaults {
 	pub confirmation_error: Option<String>,
 	/// Device and remote permission prompts fail with this reason.
 	pub permission_error: Option<String>,
-	/// `feature_supported` and `supported_chains` fail with this reason.
+	/// `feature_supported` fails with this reason.
 	pub feature_error: Option<String>,
 	/// Chat room, bot, and message calls fail with this reason.
 	pub chat_error: Option<String>,
@@ -229,7 +229,7 @@ pub struct MockConfig {
 	pub remote_permissions: PermissionPolicy,
 	/// Whether `feature_supported` reports support.
 	pub feature_supported: bool,
-	/// When set, `feature_supported` answers from `supported_chains`, as a real
+	/// When set, `feature_supported` answers from `served_chains`, as a real
 	/// host does, so a chain outside that set is unsupported. It becomes the
 	/// default in a later breaking release. The JS mock's `onlyServedChains` is
 	/// the same option.
@@ -241,13 +241,12 @@ pub struct MockConfig {
 	/// Whether `confirm_user_action` confirms reviewed actions.
 	/// [`MockPlatform::set_confirm_user_actions`] changes it for one test.
 	pub confirm_user_actions: bool,
-	/// Chains the mock reports serving (RFC 0026).
+	/// Genesis hashes of the chains the mock serves RPC for.
 	///
-	/// Defaults to the three [`mock_genesis`] chains, the same set the
-	/// TypeScript mock declares, so a suite written against either one is
-	/// answered the same way. Replace it to exercise a host serving fewer
-	/// chains, declaring each with the genesis hash its runtime config carries.
-	pub supported_chains: crate::platform::HostChainSet,
+	/// Defaults to the three [`mock_genesis`] chains, the ones
+	/// [`mock_genesis::stack`] names and the TypeScript mock serves, so a suite
+	/// written against either one is answered the same way.
+	pub served_chains: Vec<truapi::Bytes32>,
 	/// Chain connection behavior.
 	pub chain: ChainBehavior,
 	/// Error injection.
@@ -264,7 +263,11 @@ impl Default for MockConfig {
 			theme: latest::ThemeVariant::Dark,
 			language_tag: "en".to_string(),
 			confirm_user_actions: true,
-			supported_chains: mock_genesis::chain_set(),
+			served_chains: vec![
+				mock_genesis::PEOPLE,
+				mock_genesis::BULLETIN,
+				mock_genesis::ASSET_HUB,
+			],
 			chain: ChainBehavior::Silent,
 			faults: MockFaults::default(),
 		}
@@ -981,6 +984,18 @@ impl Notifications for MockPlatform {
 	}
 }
 
+/// A stack for tests that need particular genesis hashes: network `mock`
+/// under the `paseo` TLD, without a relay.
+pub fn mock_stack(
+	people: truapi::Bytes32,
+	bulletin: truapi::Bytes32,
+	asset_hub: Option<truapi::Bytes32>,
+) -> crate::platform::Stack {
+	let chains = crate::platform::StackChains { relay: None, asset_hub, people, bulletin };
+	crate::platform::Stack::new("mock".to_string(), "paseo".to_string(), chains, false)
+		.expect("a mock stack names no reserved value")
+}
+
 /// Placeholder genesis hashes for the chains a mock host serves.
 ///
 /// The TypeScript mock exports the same three under `MOCK_GENESIS`, byte for
@@ -994,26 +1009,10 @@ pub mod mock_genesis {
 	/// Genesis hash the mock reports for the asset hub chain.
 	pub const ASSET_HUB: truapi::Bytes32 = [0x33; 32];
 
-	/// The chain set a mock host serves by default.
-	pub fn chain_set() -> crate::platform::HostChainSet {
-		use truapi::latest::ChainIdentifier;
-		crate::platform::HostChainSet {
-			network: "mock".to_string(),
-			chains: vec![
-				crate::platform::HostChainEntry {
-					identifier: ChainIdentifier::People,
-					genesis_hash: PEOPLE,
-				},
-				crate::platform::HostChainEntry {
-					identifier: ChainIdentifier::Bulletin,
-					genesis_hash: BULLETIN,
-				},
-				crate::platform::HostChainEntry {
-					identifier: ChainIdentifier::AssetHub,
-					genesis_hash: ASSET_HUB,
-				},
-			],
-		}
+	/// The stack a mock host runs: [`super::mock_stack`] over the three mock
+	/// chains.
+	pub fn stack() -> crate::platform::Stack {
+		super::mock_stack(PEOPLE, BULLETIN, Some(ASSET_HUB))
 	}
 }
 
@@ -1064,15 +1063,6 @@ impl crate::platform::ExtrinsicVersionHost for MockPlatform {}
 
 #[async_trait::async_trait]
 impl Features for MockPlatform {
-	async fn supported_chains(
-		&self,
-	) -> Result<crate::platform::HostChainSet, latest::GenericError> {
-		if let Some(reason) = &self.config.faults.feature_error {
-			return Err(latest::GenericError { reason: reason.clone() });
-		}
-		Ok(self.config.supported_chains.clone())
-	}
-
 	async fn feature_supported(
 		&self,
 		request: latest::HostFeatureSupportedRequest,
@@ -1083,10 +1073,9 @@ impl Features for MockPlatform {
 		let latest::HostFeatureSupportedRequest::Chain { genesis_hash } = request;
 		let served = !self.config.only_served_chains ||
 			self.config
-				.supported_chains
-				.chains
+				.served_chains
 				.iter()
-				.any(|entry| entry.genesis_hash.as_slice() == genesis_hash.as_slice());
+				.any(|served| served.as_slice() == genesis_hash.as_slice());
 		Ok(latest::HostFeatureSupportedResponse {
 			supported: self.config.feature_supported && served,
 		})
diff --git a/rust/crates/truapi/src/platform/mock/tests.rs b/rust/crates/truapi/src/platform/mock/tests.rs
index 7d1f1ad15f..1ddeb60a54 100644
--- a/rust/crates/truapi/src/platform/mock/tests.rs
+++ b/rust/crates/truapi/src/platform/mock/tests.rs
@@ -302,7 +302,7 @@ fn feature_supported_reports_unserved_chains_only_when_asked() {
 	assert!(supported(&MockPlatform::new(), unserved.clone()));
 	let strict =
 		MockPlatform::with_config(MockConfig { only_served_chains: true, ..Default::default() });
-	let served = strict.config.supported_chains.chains[0].genesis_hash.to_vec();
+	let served = strict.config.served_chains[0].to_vec();
 	assert!(supported(&strict, served));
 	assert!(!supported(&strict, unserved));
 }
@@ -910,47 +910,30 @@ fn injected_permission_and_feature_faults_surface_as_errors() {
 		))
 		.is_err()
 	);
-	assert!(block_on(p.supported_chains()).is_err());
 	// A failed prompt is not a recorded decision.
 	assert!(p.permission_log().is_empty());
 }
 
 #[test]
-fn declared_supported_chains_are_what_the_mock_reports() {
-	// The default set is spelled out rather than compared against
-	// `mock_genesis::chain_set()`, because the TypeScript mock declares
-	// these same three and a suite written against either has to be
-	// answered the same way.
-	let p = MockPlatform::new();
-	let default_set = block_on(p.supported_chains()).expect("default set");
-	assert_eq!(default_set.network, "mock");
+fn the_mock_stack_names_the_chains_the_mock_serves() {
+	// Spelled out rather than compared against `mock_genesis`, because the
+	// TypeScript mock declares these same three and a suite written against
+	// either has to be answered the same way.
+	let stack = mock_genesis::stack();
 	assert_eq!(
-		default_set
-			.chains
-			.iter()
-			.map(|entry| (entry.identifier, entry.genesis_hash))
-			.collect::<Vec<_>>(),
-		vec![
-			(latest::ChainIdentifier::People, [0x11; 32]),
-			(latest::ChainIdentifier::Bulletin, [0x22; 32]),
-			(latest::ChainIdentifier::AssetHub, [0x33; 32]),
-		]
+		(stack.network(), stack.tld(), stack.chains().clone()),
+		(
+			"mock",
+			"paseo",
+			crate::platform::StackChains {
+				relay: None,
+				asset_hub: Some([0x33; 32]),
+				people: [0x11; 32],
+				bulletin: [0x22; 32],
+			}
+		)
 	);
-
-	let p = MockPlatform::with_config(MockConfig {
-		supported_chains: crate::platform::HostChainSet {
-			network: "paseo".to_string(),
-			chains: vec![crate::platform::HostChainEntry {
-				identifier: latest::ChainIdentifier::AssetHub,
-				genesis_hash: [0xaa; 32],
-			}],
-		},
-		..MockConfig::default()
-	});
-	let set = block_on(p.supported_chains()).expect("declared set");
-	assert_eq!(set.network, "paseo");
-	assert_eq!(set.chains.len(), 1);
-	assert_eq!(set.chains[0].genesis_hash, [0xaa; 32]);
+	assert_eq!(MockConfig::default().served_chains, vec![[0x11; 32], [0x22; 32], [0x33; 32]]);
 }
 
 #[test]
diff --git a/rust/crates/truapi/src/platform/tests.rs b/rust/crates/truapi/src/platform/tests.rs
index 235a0145b0..0b733bbe99 100644
--- a/rust/crates/truapi/src/platform/tests.rs
+++ b/rust/crates/truapi/src/platform/tests.rs
@@ -1,47 +1,5 @@
 use super::*;
 
-fn signing_host_config(
-	network_suffix: &str,
-) -> Result<SigningHostConfig, RuntimeConfigValidationError> {
-	SigningHostConfig::new(
-		HostInfo {
-			name: "Test host".to_string(),
-			icon: None,
-			version: None,
-			platform: HostPlatform::Unknown,
-		},
-		PlatformInfo::default(),
-		[0; 32],
-		[1; 32],
-		[2; 32],
-		network_suffix.to_string(),
-	)
-}
-
-#[test]
-fn a_signing_host_is_configured_for_one_dotns_tld() {
-	for tld in DOTNS_TLDS {
-		let config = signing_host_config(tld).expect("a known TLD is a valid suffix");
-		assert_eq!(config.network_suffix, *tld);
-	}
-
-	assert_eq!(
-		signing_host_config(""),
-		Err(RuntimeConfigValidationError::EmptyField { field: "network_suffix" })
-	);
-	for malformed in
-		["pasoe", "unknown", ".paseo", "peopl.paseo", "Paseo", "pas eo", "a-b", "abcdefghijklmnopq"]
-	{
-		assert_eq!(
-			signing_host_config(malformed),
-			Err(RuntimeConfigValidationError::InvalidNetworkSuffix {
-				network_suffix: malformed.to_string()
-			}),
-			"{malformed:?} must be rejected"
-		);
-	}
-}
-
 fn file_with_url(url: &str) -> ChatMessageContent {
 	ChatMessageContent::File(ChatFile {
 		url: url.to_string(),
diff --git a/rust/crates/truapi/src/runtime.rs b/rust/crates/truapi/src/runtime.rs
index 463e2d617e..e5c87c6cd5 100644
--- a/rust/crates/truapi/src/runtime.rs
+++ b/rust/crates/truapi/src/runtime.rs
@@ -772,9 +772,7 @@ impl ProductRuntimeHost {
 				platform: truapi::latest::HostPlatform::Web,
 			},
 			crate::platform::PlatformInfo::default(),
-			[0; 32],
-			[0xbb; 32],
-			[0xcc; 32],
+			crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 			"polkadotapp".to_string(),
 		)
 		.expect("compat runtime config is valid")
@@ -816,9 +814,7 @@ impl ProductRuntimeHost {
 		let services = RuntimeServices::new(
 			platform.clone(),
 			host_config.host.host_info.clone(),
-			host_config.people_chain_genesis_hash,
-			host_config.bulletin_chain_genesis_hash,
-			host_config.asset_hub_chain_genesis_hash,
+			host_config.stack.clone(),
 			spawner.clone(),
 		);
 		let pairing_host = PairingHost::new(services.clone(), host_config);
diff --git a/rust/crates/truapi/src/runtime/capabilities/chain.rs b/rust/crates/truapi/src/runtime/capabilities/chain.rs
index 3de75de48a..76bc6abebf 100644
--- a/rust/crates/truapi/src/runtime/capabilities/chain.rs
+++ b/rust/crates/truapi/src/runtime/capabilities/chain.rs
@@ -32,12 +32,9 @@ use truapi::{
 	},
 };
 
-use crate::{
-	host_logic::features::{chain_info, supported_chains},
-	runtime::{
-		AUTHORITY_CANCEL_UNWIND_GRACE, PERMISSION_DENIED_REASON, ProductConnection,
-		ProductRuntimeHost, runtime_failure_to_call_error, versioning::version,
-	},
+use crate::runtime::{
+	AUTHORITY_CANCEL_UNWIND_GRACE, PERMISSION_DENIED_REASON, ProductConnection, ProductRuntimeHost,
+	runtime_failure_to_call_error, versioning::version,
 };
 
 impl ProductConnection {
@@ -336,10 +333,7 @@ impl Chain for ProductRuntimeHost {
 	) -> Result<RemoteChainInfoResponse, CallError<RemoteChainInfoError>> {
 		version(request)
 			.exec(|inner| async move {
-				let set = supported_chains(self.connection.services.platform.as_ref())
-					.await
-					.map_err(|err| CallError::Domain(latest::RemoteChainInfoError::Unknown(err)))?;
-				chain_info(&set, &inner).map_err(CallError::Domain)
+				self.connection.services.stack().chain_info(&inner).map_err(CallError::Domain)
 			})
 			.await
 	}
diff --git a/rust/crates/truapi/src/runtime/identity.rs b/rust/crates/truapi/src/runtime/identity.rs
index 9fb744b266..42ceede79c 100644
--- a/rust/crates/truapi/src/runtime/identity.rs
+++ b/rust/crates/truapi/src/runtime/identity.rs
@@ -36,11 +36,12 @@ const LOOKUP_BUDGET: Duration = Duration::from_secs(45);
 
 /// Fills in missing usernames by querying the dotNS contracts on Asset Hub.
 /// Returns the session unchanged when it already carries a username. Also
-/// returns it unchanged when no Asset Hub is configured.
+/// returns it unchanged when `asset_hub_chain_genesis_hash` is `None`, for a
+/// stack that names no Asset Hub.
 #[instrument(skip_all, fields(runtime.method = "session.identity.resolve_with_chain"))]
 pub async fn resolve_session_identity_with_chain(
 	chain: &ChainRuntime,
-	asset_hub_chain_genesis_hash: [u8; 32],
+	asset_hub_chain_genesis_hash: Option<[u8; 32]>,
 	session: SessionInfo,
 ) -> SessionInfo {
 	if session.has_username() {
@@ -57,18 +58,16 @@ pub async fn resolve_session_identity_with_chain(
 
 /// Reads `session`'s usernames from the dotNS contracts on Asset Hub, whatever
 /// usernames it already carries. The identity account is tried first, then the
-/// root key when the identity account holds no username. Returns `None` when no
-/// Asset Hub is configured, neither account holds a username, or the lookup
-/// fails.
+/// root key when the identity account holds no username. Returns `None` when
+/// `asset_hub_chain_genesis_hash` is `None`, neither account holds a username,
+/// or the lookup fails.
 #[instrument(skip_all, fields(runtime.method = "session.identity.lookup_session"))]
 pub async fn lookup_session_identity(
 	chain: &ChainRuntime,
-	asset_hub_chain_genesis_hash: [u8; 32],
+	asset_hub_chain_genesis_hash: Option<[u8; 32]>,
 	session: &SessionInfo,
 ) -> Option<DotnsIdentity> {
-	if asset_hub_chain_genesis_hash == [0; 32] {
-		return None;
-	}
+	let asset_hub_chain_genesis_hash = asset_hub_chain_genesis_hash?;
 
 	let budget = futures_timer::Delay::new(LOOKUP_BUDGET).fuse();
 	pin_mut!(budget);
diff --git a/rust/crates/truapi/src/runtime/identity/tests.rs b/rust/crates/truapi/src/runtime/identity/tests.rs
index 5c480be826..f68d6575c6 100644
--- a/rust/crates/truapi/src/runtime/identity/tests.rs
+++ b/rust/crates/truapi/src/runtime/identity/tests.rs
@@ -280,7 +280,9 @@ fn in_core_lookup_resolves_usernames_over_one_runtime_follow() {
 	let session = session_without_usernames([0x11; 32], ACCOUNT);
 
 	let resolved = futures::executor::block_on(resolve_session_identity_with_chain(
-		&chain, [0xcc; 32], session,
+		&chain,
+		Some([0xcc; 32]),
+		session,
 	));
 
 	// The pending claim yields the lite name; the settled store yields the
@@ -319,7 +321,9 @@ fn root_key_resolves_when_identity_account_labels_are_unissued() {
 	let session = session_without_usernames(ACCOUNT, SQUATTER);
 
 	let resolved = futures::executor::block_on(resolve_session_identity_with_chain(
-		&chain, [0xcc; 32], session,
+		&chain,
+		Some([0xcc; 32]),
+		session,
 	));
 
 	assert_eq!(
diff --git a/rust/crates/truapi/src/runtime/pairing_host/tests.rs b/rust/crates/truapi/src/runtime/pairing_host/tests.rs
index 85b736e8fc..8ff21bfc21 100644
--- a/rust/crates/truapi/src/runtime/pairing_host/tests.rs
+++ b/rust/crates/truapi/src/runtime/pairing_host/tests.rs
@@ -46,9 +46,7 @@ fn a_withdrawn_request_already_published_is_cancelled_on_the_phone() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -103,9 +101,7 @@ fn a_request_that_times_out_is_not_withdrawn_from_the_phone() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -153,9 +149,7 @@ fn a_withdrawn_request_with_a_newer_one_behind_it_sends_no_cancel() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
diff --git a/rust/crates/truapi/src/runtime/product_manifest/tests.rs b/rust/crates/truapi/src/runtime/product_manifest/tests.rs
index a0e846c8af..0409a5f62e 100644
--- a/rust/crates/truapi/src/runtime/product_manifest/tests.rs
+++ b/rust/crates/truapi/src/runtime/product_manifest/tests.rs
@@ -57,7 +57,7 @@ fn a_worker_subname_is_the_namehash_of_its_full_name() {
 #[test]
 fn an_uncached_lookup_reports_why_it_read_no_manifest() {
 	let lookup = |platform: crate::test_support::StubPlatform,
-	              asset_hub_chain_genesis_hash: [u8; 32],
+	              asset_hub: Option<[u8; 32]>,
 	              ceiling: Duration| {
 		let platform = std::sync::Arc::new(platform);
 		let services = RuntimeServices::new(
@@ -68,9 +68,7 @@ fn an_uncached_lookup_reports_why_it_read_no_manifest() {
 				version: None,
 				platform: truapi::latest::HostPlatform::Unknown,
 			},
-			[0; 32],
-			[0xbb; 32],
-			asset_hub_chain_genesis_hash,
+			crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], asset_hub),
 			crate::test_support::test_spawner(),
 		);
 		futures::executor::block_on(root_manifest_within(
@@ -82,13 +80,13 @@ fn an_uncached_lookup_reports_why_it_read_no_manifest() {
 	};
 	assert_eq!(
 		[
-			lookup(Default::default(), [0; 32], MANIFEST_RESOLUTION_CEILING),
+			lookup(Default::default(), None, MANIFEST_RESOLUTION_CEILING),
 			lookup(
 				crate::test_support::StubPlatform {
 					chain_connect_error: Some("fixture serves no chain"),
 					..Default::default()
 				},
-				[0xcc; 32],
+				Some([0xcc; 32]),
 				MANIFEST_RESOLUTION_CEILING,
 			),
 			lookup(
@@ -96,7 +94,7 @@ fn an_uncached_lookup_reports_why_it_read_no_manifest() {
 					chain_connect_pending: true,
 					..Default::default()
 				},
-				[0xcc; 32],
+				Some([0xcc; 32]),
 				Duration::from_millis(10),
 			),
 		],
diff --git a/rust/crates/truapi/src/runtime/services.rs b/rust/crates/truapi/src/runtime/services.rs
index 6001d1649d..0c3654ee46 100644
--- a/rust/crates/truapi/src/runtime/services.rs
+++ b/rust/crates/truapi/src/runtime/services.rs
@@ -20,7 +20,7 @@ use crate::{
 	host_logic::worker::WorkerLedger,
 	platform::{
 		BalancePlatform, ChatPlatform, ContactsPlatform, GamePlatform, HostInfo, PaymentPlatform,
-		PermissionStatusHost, Platform, PocketPlatform, ScannerPlatform, TopUpPlatform,
+		PermissionStatusHost, Platform, PocketPlatform, ScannerPlatform, Stack, TopUpPlatform,
 	},
 	runtime::{
 		bulletin_rpc::BulletinRpc, sso_responder_service::DevicePairingObserver,
@@ -121,9 +121,8 @@ pub struct RuntimeServices {
 	/// recovery to whoever calls it.
 	#[cfg(not(target_arch = "wasm32"))]
 	durable_work_observer: OnceLock<Arc<dyn DurableWorkObserver>>,
-	/// Asset Hub the dotNS contracts are deployed on. All-zero says this host
-	/// has none, which leaves every manifest unresolvable.
-	asset_hub_chain_genesis_hash: [u8; 32],
+	/// The stack the host runs, fixed for the life of the runtime.
+	stack: Stack,
 	/// Reference counts per product worker.
 	pub worker_ledger: WorkerLedger,
 	/// Shared chainHead-v1 runtime behind the Chain surface.
@@ -159,39 +158,23 @@ pub struct RuntimeServices {
 
 impl RuntimeServices {
 	/// Build role-neutral runtime services from the platform, the host
-	/// identity reported to products, the People-chain genesis hash used by
-	/// statement-store backed protocols, the Bulletin-chain genesis hash used
-	/// for in-core preimage submission, and the Asset Hub genesis hash product
-	/// manifests are resolved from.
-	///
-	/// The three genesis hashes are adjacent and same-typed, so a transposition
-	/// compiles. Each call site is pinned by its own test.
+	/// identity reported to products, and the stack whose People chain backs
+	/// the statement store, whose Bulletin chain takes in-core preimage
+	/// submissions, and whose Asset Hub product manifests resolve from.
 	pub fn new(
 		platform: Arc<dyn Platform>,
 		host_info: HostInfo,
-		people_chain_genesis_hash: [u8; 32],
-		bulletin_chain_genesis_hash: [u8; 32],
-		asset_hub_chain_genesis_hash: [u8; 32],
+		stack: Stack,
 		spawner: Spawner,
 	) -> Arc<Self> {
-		Self::with_chat_platform(
-			platform,
-			host_info,
-			people_chain_genesis_hash,
-			bulletin_chain_genesis_hash,
-			asset_hub_chain_genesis_hash,
-			spawner,
-			None,
-		)
+		Self::with_chat_platform(platform, host_info, stack, spawner, None)
 	}
 
 	/// Same as [`Self::new`], with the host's chat adapter installed.
 	pub fn with_chat_platform(
 		platform: Arc<dyn Platform>,
 		host_info: HostInfo,
-		people_chain_genesis_hash: [u8; 32],
-		bulletin_chain_genesis_hash: [u8; 32],
-		asset_hub_chain_genesis_hash: [u8; 32],
+		stack: Stack,
 		spawner: Spawner,
 		chat_platform: Option<Arc<dyn ChatPlatform>>,
 	) -> Arc<Self> {
@@ -200,12 +183,11 @@ impl RuntimeServices {
 		let statement_store = StatementStoreRpc::new(
 			platform.clone(),
 			chain.clone(),
-			people_chain_genesis_hash,
+			stack.chains().people,
 			spawner.clone(),
 		);
 		let extrinsics = Arc::new(ExtrinsicService::over_chain(chain.clone(), platform.clone()));
-		let bulletin =
-			BulletinRpc::new(chain.clone(), extrinsics.clone(), bulletin_chain_genesis_hash);
+		let bulletin = BulletinRpc::new(chain.clone(), extrinsics.clone(), stack.chains().bulletin);
 		// The funding registry follows sessions through the services it
 		// belongs to, so it is built holding them.
 		Arc::new_cyclic(|services| Self {
@@ -242,7 +224,7 @@ impl RuntimeServices {
 			encrypted_storage: OnceLock::new(),
 			#[cfg(not(target_arch = "wasm32"))]
 			durable_work_observer: OnceLock::new(),
-			asset_hub_chain_genesis_hash,
+			stack,
 			worker_ledger: WorkerLedger::default(),
 			chain,
 			extrinsics,
@@ -267,20 +249,18 @@ impl RuntimeServices {
 		self.permission_status.set(host).is_ok()
 	}
 
-	/// The Asset Hub dotNS reads run against, when one is configured.
-	///
-	/// Taken by construction, so the chain a grant is adjudicated against
-	/// cannot move under a running product. It is deliberately not sourced from
-	/// `supported_chains()`, which is an uncached per-call host syscall
-	/// answering a different question, "which chains do I serve RPC for?", the
-	/// product-facing `get_chain_info` advertisement, rather than "which Asset
-	/// Hub is dotNS deployed on?". Taking it from there would let the anchor
-	/// change between two calls, at host discretion, with nothing recording it.
+	/// The stack the host runs.
+	pub fn stack(&self) -> &Stack {
+		&self.stack
+	}
+
+	/// The Asset Hub dotNS reads run against, when the stack has one.
 	///
-	/// An all-zero hash is how a host says it has no Asset Hub. `None` fails
-	/// every manifest lookup closed: grants are refused rather than assumed.
+	/// Fixed by construction, so the chain a grant is adjudicated against
+	/// cannot move under a running product. `None` fails every manifest lookup
+	/// closed: grants are refused rather than assumed.
 	pub fn asset_hub_chain_genesis_hash(&self) -> Option<[u8; 32]> {
-		Some(self.asset_hub_chain_genesis_hash).filter(|hash| *hash != [0u8; 32])
+		self.stack.chains().asset_hub
 	}
 
 	/// The host's live OS permission-status adapter, when one is installed.
diff --git a/rust/crates/truapi/src/runtime/signing_host.rs b/rust/crates/truapi/src/runtime/signing_host.rs
index 0bba3eda5b..657235e401 100644
--- a/rust/crates/truapi/src/runtime/signing_host.rs
+++ b/rust/crates/truapi/src/runtime/signing_host.rs
@@ -8,7 +8,7 @@ mod sso_service;
 
 use std::sync::{Arc, Mutex};
 use truapi::latest::{
-	ChainIdentifier, DerivationIndex, HostAccountCreateProofRequest, HostAccountGetAliasRequest,
+	DerivationIndex, HostAccountCreateProofRequest, HostAccountGetAliasRequest,
 	HostAccountListRingVrfKeysRequest, HostAccountRegisterRingVrfKeyRequest,
 	HostAccountRingVrfSignRequest, ProductAccountId, RingLocation, RingLocationJunction,
 };
@@ -44,7 +44,6 @@ use crate::{
 	},
 	host_logic::{
 		entropy::derive_product_entropy,
-		features::genesis_for,
 		product_account::{
 			SR25519_SIGNING_CONTEXT, derivation_index_bytes, derive_full_person_ring_vrf_entropy,
 			derive_identity_keypair, derive_lite_person_ring_vrf_entropy, derive_product_keypair,
@@ -80,10 +79,6 @@ use zeroize::Zeroizing;
 pub struct SigningHost {
 	services: Arc<RuntimeServices>,
 	platform: Arc<dyn Platform>,
-	/// The dotNS TLD of the network this wallet serves, from
-	/// [`crate::platform::SigningHostConfig::network_suffix`]. Every reserved
-	/// RFC-0022 derivation (`uid.<suffix>`, `peopl.<suffix>`) ends in it.
-	network_suffix: String,
 	session_state: Arc<SessionState>,
 	auth_state: AuthStateMachine,
 	/// Account-access decisions and reviews for local and paired callers.
@@ -115,15 +110,14 @@ pub struct SigningHost {
 }
 
 impl SigningHost {
-	/// Build a locked signing host for the network's dotNS suffix.
-	pub fn new(services: Arc<RuntimeServices>, network_suffix: String) -> Arc<Self> {
+	/// Build a locked signing host for the stack `services` runs.
+	pub fn new(services: Arc<RuntimeServices>) -> Arc<Self> {
 		let platform = services.platform.clone();
 		let ring_resolver = ChainRingResolver::new(services.chain.clone());
 		let session_state = SessionState::new();
 		Arc::new(Self {
 			services,
 			platform: platform.clone(),
-			network_suffix,
 			#[cfg(feature = "test-host")]
 			resource_controls: Arc::default(),
 			#[cfg(feature = "test-host")]
@@ -197,16 +191,13 @@ impl SigningHost {
 				version: None,
 				platform: truapi::latest::HostPlatform::Unknown,
 			},
-			[0; 32],
-			[0xbb; 32],
-			[0xcc; 32],
+			crate::test_support::test_stack(network_suffix, [0; 32], [0xbb; 32], Some([0xcc; 32])),
 			crate::test_support::test_spawner(),
 		);
 		let session_state = SessionState::new();
 		Arc::new(Self {
 			services,
 			platform: platform.clone(),
-			network_suffix: network_suffix.to_string(),
 			#[cfg(feature = "test-host")]
 			resource_controls: Arc::default(),
 			#[cfg(feature = "test-host")]
@@ -229,10 +220,10 @@ impl SigningHost {
 		self.session_state.clone()
 	}
 
-	/// The dotNS TLD of the network this wallet serves: the suffix of every
+	/// The dotNS TLD of the stack this wallet serves: the suffix of every
 	/// reserved identity it derives.
 	pub fn network_suffix(&self) -> &str {
-		&self.network_suffix
+		self.services.stack().tld()
 	}
 
 	/// Current root entropy, or [`AuthorityError::Disconnected`] when no local
@@ -386,7 +377,7 @@ impl SigningHost {
 
 	fn identity_keypair(&self) -> Result<schnorrkel::Keypair, AuthorityError> {
 		let entropy = self.root_entropy()?;
-		derive_identity_keypair(&entropy, &self.network_suffix).map_err(Into::into)
+		derive_identity_keypair(&entropy, self.network_suffix()).map_err(Into::into)
 	}
 
 	fn identity_keypair_for(
@@ -486,11 +477,11 @@ impl SigningHost {
 		Ok(vec![
 			CollectionCandidate {
 				collection: PersonhoodCollection::People,
-				entropy: derive_full_person_ring_vrf_entropy(&root, &self.network_suffix),
+				entropy: derive_full_person_ring_vrf_entropy(&root, self.network_suffix()),
 			},
 			CollectionCandidate {
 				collection: PersonhoodCollection::LitePeople,
-				entropy: derive_lite_person_ring_vrf_entropy(&root, &self.network_suffix),
+				entropy: derive_lite_person_ring_vrf_entropy(&root, self.network_suffix()),
 			},
 		])
 	}
@@ -500,16 +491,10 @@ impl SigningHost {
 		session: &AuthoritySession,
 		owner: &ProductId,
 	) -> Result<(), RingVrfError> {
-		if owner != &personhood_product_id(&self.network_suffix) {
+		if owner != &personhood_product_id(self.network_suffix()) {
 			return Ok(());
 		}
-		let chains = self
-			.platform
-			.supported_chains()
-			.await
-			.map_err(|error| RingVrfError::Unknown { reason: error.reason })?;
-		let chain_id =
-			genesis_for(&chains, ChainIdentifier::People).ok_or(RingVrfError::RingNotFound)?;
+		let chain_id = self.services.stack().chains().people;
 		let entries = self.ring_vrf_registry.owner_entries(session.public_key, owner).await?;
 		let missing = [(PersonhoodCollection::People, 0), (PersonhoodCollection::LitePeople, 1)]
 			.into_iter()
diff --git a/rust/crates/truapi/src/runtime/signing_host/allowance.rs b/rust/crates/truapi/src/runtime/signing_host/allowance.rs
index bb6d458793..03705f254b 100644
--- a/rust/crates/truapi/src/runtime/signing_host/allowance.rs
+++ b/rust/crates/truapi/src/runtime/signing_host/allowance.rs
@@ -27,15 +27,12 @@ pub enum AllowanceAllocationError {
 	/// Signing host session or authority state was unavailable.
 	#[error("{0}")]
 	Authority(#[from] AuthorityError),
-	/// The host serves no chain for this role, so there is nothing to claim on.
-	#[error("host serves no {chain} chain")]
+	/// The stack has no chain for this role, so there is nothing to claim on.
+	#[error("the stack has no {chain} chain")]
 	ChainNotServed {
 		/// Role that could not be resolved.
 		chain: &'static str,
 	},
-	/// Reading the host's chain set failed.
-	#[error("supported chains: {0}")]
-	SupportedChains(String),
 	/// Product-account key derivation failed.
 	#[error("{0}")]
 	ProductAccount(#[from] ProductAccountError),
@@ -336,12 +333,7 @@ pub async fn allocate_smart_contract_allowance(
 	derivation_index: api::DerivationIndex,
 	policy: OnExistingAllowancePolicy,
 ) -> Result<(), AllowanceAllocationError> {
-	use truapi::latest::ChainIdentifier;
-
-	use crate::{
-		host_logic::features,
-		runtime::statement_allowance::{self, ChainClient, find_including_rings, pgas},
-	};
+	use crate::runtime::statement_allowance::{self, ChainClient, find_including_rings, pgas};
 
 	signing_host.require_current_session(session)?;
 
@@ -354,10 +346,8 @@ pub async fn allocate_smart_contract_allowance(
 		.public
 		.to_bytes();
 
-	let chains = features::supported_chains(services.platform.as_ref())
-		.await
-		.map_err(|err| AllowanceAllocationError::SupportedChains(err.reason))?;
-	let asset_hub_genesis = features::genesis_for(&chains, ChainIdentifier::AssetHub)
+	let asset_hub_genesis = services
+		.asset_hub_chain_genesis_hash()
 		.ok_or(AllowanceAllocationError::ChainNotServed { chain: "Asset Hub" })?;
 	let asset_hub_client = ChainClient::new(
 		statement_allowance::rpc::RpcClient::new(subxt_rpcs::RpcClient::new(
diff --git a/rust/crates/truapi/src/runtime/signing_host/local_activation.rs b/rust/crates/truapi/src/runtime/signing_host/local_activation.rs
index 955e8f16b8..7e51fee642 100644
--- a/rust/crates/truapi/src/runtime/signing_host/local_activation.rs
+++ b/rust/crates/truapi/src/runtime/signing_host/local_activation.rs
@@ -66,7 +66,7 @@ impl LocalActivation for SigningHost {
 		(self.services.spawner)(Box::pin(async move {
 			let Some(identity) = lookup_session_identity(
 				&services.chain,
-				services.asset_hub_chain_genesis_hash().unwrap_or_default(),
+				services.asset_hub_chain_genesis_hash(),
 				&session,
 			)
 			.await
diff --git a/rust/crates/truapi/src/runtime/signing_host/tests.rs b/rust/crates/truapi/src/runtime/signing_host/tests.rs
index d396ba6aee..772ec8f664 100644
--- a/rust/crates/truapi/src/runtime/signing_host/tests.rs
+++ b/rust/crates/truapi/src/runtime/signing_host/tests.rs
@@ -105,7 +105,7 @@ impl RingResolver for StubRingResolver {
 #[test]
 fn the_signing_role_adjudicates_grants_against_the_asset_hub_it_installed() {
 	let (services, _authority) =
-		signing_runtime_on_asset_hub(Arc::new(StubPlatform::default()), [0xcc; 32]);
+		signing_runtime_on_asset_hub(Arc::new(StubPlatform::default()), Some([0xcc; 32]));
 	assert_eq!(
 		services.asset_hub_chain_genesis_hash(),
 		Some([0xcc; 32]),
@@ -145,12 +145,12 @@ fn signing_runtime() -> (Arc<RuntimeServices>, Arc<SigningHostRole>) {
 fn signing_runtime_with_platform(
 	platform: Arc<dyn Platform>,
 ) -> (Arc<RuntimeServices>, Arc<SigningHostRole>) {
-	signing_runtime_on_asset_hub(platform, [0; 32])
+	signing_runtime_on_asset_hub(platform, None)
 }
 
 fn signing_runtime_on_asset_hub(
 	platform: Arc<dyn Platform>,
-	asset_hub_chain_genesis_hash: [u8; 32],
+	asset_hub_chain_genesis_hash: Option<[u8; 32]>,
 ) -> (Arc<RuntimeServices>, Arc<SigningHostRole>) {
 	let config = SigningHostConfig::new(
 		HostInfo {
@@ -160,21 +160,21 @@ fn signing_runtime_on_asset_hub(
 			platform: truapi::latest::HostPlatform::Ios,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		asset_hub_chain_genesis_hash,
-		TEST_NETWORK_SUFFIX.to_string(),
+		crate::test_support::test_stack(
+			TEST_NETWORK_SUFFIX,
+			[0; 32],
+			[0xbb; 32],
+			asset_hub_chain_genesis_hash,
+		),
 	)
 	.expect("signing host config is valid");
 	let services = RuntimeServices::new(
 		platform.clone(),
 		config.host.host_info.clone(),
-		config.people_chain_genesis_hash,
-		config.bulletin_chain_genesis_hash,
-		config.asset_hub_chain_genesis_hash,
+		config.stack.clone(),
 		test_spawner(),
 	);
-	let signing_host = SigningHostRole::new(services.clone(), config.network_suffix);
+	let signing_host = SigningHostRole::new(services.clone());
 	(services, signing_host)
 }
 
@@ -2619,7 +2619,7 @@ fn a_pgas_request_waits_on_the_asset_hub_connection() {
 
 	let platform =
 		Arc::new(StubPlatform { chain_connect_pending: true, ..StubPlatform::default() });
-	let (_services, authority) = signing_runtime_with_platform(platform);
+	let (_services, authority) = signing_runtime_on_asset_hub(platform, Some([0xcc; 32]));
 	futures::executor::block_on(authority.activate_local_session(ENTROPY.to_vec()))
 		.expect("activation");
 	let session = authority.current_session().expect("connected");
diff --git a/rust/crates/truapi/src/runtime/sso_request_service.rs b/rust/crates/truapi/src/runtime/sso_request_service.rs
index bdd32c76b8..6375e34036 100644
--- a/rust/crates/truapi/src/runtime/sso_request_service.rs
+++ b/rust/crates/truapi/src/runtime/sso_request_service.rs
@@ -283,7 +283,7 @@ impl SsoRequestService {
 		let activation_epoch = self.advance_session_lifecycle();
 		let resolved = resolve_session_identity_with_chain(
 			&self.chain,
-			self.host_config.asset_hub_chain_genesis_hash,
+			self.host_config.stack.chains().asset_hub,
 			session,
 		)
 		.await;
@@ -340,7 +340,7 @@ impl SsoRequestService {
 		};
 		let resolved = resolve_session_identity_with_chain(
 			&self.chain,
-			self.host_config.asset_hub_chain_genesis_hash,
+			self.host_config.stack.chains().asset_hub,
 			session,
 		)
 		.await;
@@ -568,13 +568,13 @@ impl SsoRequestService {
 
 	async fn refresh_current_session_identity(&self) -> Option<AuthoritySession> {
 		let current = self.session_state.current()?;
-		if current.has_username() || self.host_config.asset_hub_chain_genesis_hash == [0; 32] {
+		if current.has_username() || self.host_config.stack.chains().asset_hub.is_none() {
 			return Some(authority_session(&current));
 		}
 
 		let resolved = resolve_session_identity_with_chain(
 			&self.chain,
-			self.host_config.asset_hub_chain_genesis_hash,
+			self.host_config.stack.chains().asset_hub,
 			current.clone(),
 		)
 		.await;
diff --git a/rust/crates/truapi/src/runtime/sso_request_service/pairing.rs b/rust/crates/truapi/src/runtime/sso_request_service/pairing.rs
index 223e5b3b9f..3aefc68818 100644
--- a/rust/crates/truapi/src/runtime/sso_request_service/pairing.rs
+++ b/rust/crates/truapi/src/runtime/sso_request_service/pairing.rs
@@ -259,7 +259,7 @@ impl<'a> SsoPairingFlow<'a> {
 		};
 		let resolve_session = resolve_session_identity_with_chain(
 			&self.host.chain,
-			self.host.host_config.asset_hub_chain_genesis_hash,
+			self.host.host_config.stack.chains().asset_hub,
 			session,
 		)
 		.fuse();
diff --git a/rust/crates/truapi/src/runtime/sso_request_service/pairing/tests.rs b/rust/crates/truapi/src/runtime/sso_request_service/pairing/tests.rs
index 3f74f354ba..5fcc3bc263 100644
--- a/rust/crates/truapi/src/runtime/sso_request_service/pairing/tests.rs
+++ b/rust/crates/truapi/src/runtime/sso_request_service/pairing/tests.rs
@@ -497,8 +497,7 @@ fn request_login_accepts_pairing_statement_from_snapshot_query_page() {
 		..Default::default()
 	});
 	let connection =
-		futures::executor::block_on(platform.connect(host_config.people_chain_genesis_hash))
-			.unwrap();
+		futures::executor::block_on(platform.connect(host_config.stack.chains().people)).unwrap();
 	let rpc_client = RpcClient::new(HostRpcClient::new(Arc::from(connection), test_spawner()));
 	let progress = futures::executor::block_on(run_pairing_snapshot_query(
 		rpc_client,
diff --git a/rust/crates/truapi/src/runtime/sso_responder_service/tests.rs b/rust/crates/truapi/src/runtime/sso_responder_service/tests.rs
index 89fad92728..0fbdb6ee33 100644
--- a/rust/crates/truapi/src/runtime/sso_responder_service/tests.rs
+++ b/rust/crates/truapi/src/runtime/sso_responder_service/tests.rs
@@ -71,22 +71,16 @@ fn signing_fixture(platform: Arc<StubPlatform>) -> (Arc<RuntimeServices>, Arc<Si
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		// No dotNS Asset Hub, so activation looks up no username.
-		[0; 32],
-		NETWORK_SUFFIX.to_string(),
+		crate::test_support::test_stack(NETWORK_SUFFIX, [0; 32], [0xbb; 32], None),
 	)
 	.expect("signing host config is valid");
 	let services = RuntimeServices::new(
 		platform.clone(),
 		config.host.host_info.clone(),
-		config.people_chain_genesis_hash,
-		config.bulletin_chain_genesis_hash,
-		config.asset_hub_chain_genesis_hash,
+		config.stack.clone(),
 		test_spawner(),
 	);
-	let signing_host = SigningHost::new(services.clone(), config.network_suffix);
+	let signing_host = SigningHost::new(services.clone());
 	futures::executor::block_on(signing_host.activate_local_session(ENTROPY.to_vec()))
 		.expect("activation succeeds");
 	(services, signing_host)
diff --git a/rust/crates/truapi/src/runtime/statement_store/tests.rs b/rust/crates/truapi/src/runtime/statement_store/tests.rs
index 8d679349a1..2f91e00611 100644
--- a/rust/crates/truapi/src/runtime/statement_store/tests.rs
+++ b/rust/crates/truapi/src/runtime/statement_store/tests.rs
@@ -72,12 +72,10 @@ fn signing_host_runtime_on(
 			version: None,
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
-		[0; 32],
-		[0xbb; 32],
-		[0xcc; 32],
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 		test_spawner(),
 	);
-	let signing_host = SigningHostRole::new(services.clone(), "paseo".to_string());
+	let signing_host = SigningHostRole::new(services.clone());
 	futures::executor::block_on(signing_host.activate_local_session(ENTROPY.to_vec()))
 		.expect("activation succeeds");
 	let host = ProductRuntimeHost::from_services(
diff --git a/rust/crates/truapi/src/runtime/tests.rs b/rust/crates/truapi/src/runtime/tests.rs
index ea5c510e35..01a25080da 100644
--- a/rust/crates/truapi/src/runtime/tests.rs
+++ b/rust/crates/truapi/src/runtime/tests.rs
@@ -228,6 +228,7 @@ fn get_product_context_returns_the_runtime_canonical_product_id() {
 	}
 }
 
+/// `get_chain_info` answers from the host's stack, not from a host callback.
 #[test]
 fn get_chain_info_round_trips_through_runtime() {
 	let host = ProductRuntimeHost::new_compat(stub_platform(), test_spawner());
@@ -236,10 +237,14 @@ fn get_chain_info_round_trips_through_runtime() {
 		chain: v01::ChainIdentifier::AssetHub,
 	});
 	let response = futures::executor::block_on(host.get_chain_info(&cx, request)).unwrap();
-	let RemoteChainInfoResponse::V1(inner) = response;
-	assert_eq!(inner.network, "paseo");
-	assert_eq!(inner.chain, v01::ChainIdentifier::AssetHub);
-	assert_eq!(inner.genesis_hash, [0xaa; 32]);
+	assert_eq!(
+		response,
+		RemoteChainInfoResponse::V1(v01::RemoteChainInfoResponse {
+			network: "paseo".to_string(),
+			chain: v01::ChainIdentifier::AssetHub,
+			genesis_hash: [0xcc; 32],
+		})
+	);
 }
 
 #[test]
@@ -692,12 +697,14 @@ fn a_proof_naming_the_caller_in_another_spelling_is_still_its_own() {
 	);
 }
 
+/// The compat stack has no relay, so a product asking for one is told the
+/// host does not serve it.
 #[test]
 fn get_chain_info_unserved_identifier_is_not_supported() {
 	let host = ProductRuntimeHost::new_compat(stub_platform(), test_spawner());
 	let cx = CallContext::default();
 	let request = RemoteChainInfoRequest::V1(v01::RemoteChainInfoRequest {
-		chain: v01::ChainIdentifier::Bulletin,
+		chain: v01::ChainIdentifier::Relay,
 	});
 	let error = futures::executor::block_on(host.get_chain_info(&cx, request)).unwrap_err();
 	assert_eq!(
@@ -808,9 +815,7 @@ fn contacts_host(
 	let services = RuntimeServices::with_chat_platform(
 		platform as Arc<dyn Platform>,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 		None,
 	);
@@ -880,9 +885,7 @@ fn a_host_that_only_resolves_contacts_reports_unsupported() {
 	let services = RuntimeServices::with_chat_platform(
 		stub_platform() as Arc<dyn Platform>,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 		None,
 	);
@@ -1202,9 +1205,7 @@ fn host_with_contacts(contacts: Arc<dyn crate::platform::ContactsPlatform>) -> P
 	let services = RuntimeServices::with_chat_platform(
 		stub_platform() as Arc<dyn Platform>,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 		None,
 	);
@@ -1503,9 +1504,7 @@ fn chat_post_message_screens_content_before_it_reaches_a_host() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner.clone(),
 	);
 	let chat_platform = Arc::new(RecordingChatPlatform::default());
@@ -1650,9 +1649,7 @@ fn a_room_footer_reaches_the_host_for_the_room_the_product_created() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner.clone(),
 	);
 	let chat_platform = Arc::new(RecordingChatPlatform {
@@ -1759,9 +1756,7 @@ fn chat_post_message_screens_the_alt_before_it_reaches_a_host() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner.clone(),
 	);
 	let chat_platform = Arc::new(RecordingChatPlatform::default());
@@ -1841,9 +1836,7 @@ fn chat_room_ids_agree_across_create_and_post() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner.clone(),
 	);
 	let chat_platform = Arc::new(RecordingChatPlatform::default());
@@ -1925,9 +1918,7 @@ fn chat_register_bot_rejects_unsafe_product_fields() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner.clone(),
 	);
 	let chat_platform = Arc::new(RecordingChatPlatform::default());
@@ -2014,9 +2005,7 @@ fn chat_register_bot_reaches_the_installed_adapter() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner.clone(),
 	);
 	let chat_platform = Arc::new(RecordingChatPlatform::default());
@@ -2116,9 +2105,7 @@ fn pocket_dot_host(
 	let services = RuntimeServices::new(
 		platform,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -2460,9 +2447,7 @@ fn game_host_for(
 	let services = RuntimeServices::new(
 		platform,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -2730,9 +2715,7 @@ fn funding_services_with(
 	let services = RuntimeServices::new(
 		platform,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner,
 	);
 	assert!(services.install_core_db(db.clone()));
@@ -3369,9 +3352,7 @@ fn chain_follow_ids_are_scoped_per_product_core() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner.clone(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -3479,9 +3460,7 @@ fn permission_prompts_name_the_requesting_product_and_execution_kind() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		spawner,
 	);
 	let adapters = crate::host_core::ConnectionAdapters::from_services(&services);
@@ -7079,9 +7058,7 @@ fn the_pairing_authority_refuses_a_foreign_ring_vrf_key_without_a_grant() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -7163,9 +7140,7 @@ fn the_pairing_authority_admits_a_context_only_its_product_granted() {
 		let services = RuntimeServices::new(
 			platform.clone(),
 			host_config.host.host_info.clone(),
-			host_config.people_chain_genesis_hash,
-			host_config.bulletin_chain_genesis_hash,
-			host_config.asset_hub_chain_genesis_hash,
+			host_config.stack.clone(),
 			test_spawner(),
 		);
 		let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -7232,9 +7207,7 @@ fn a_grant_lookup_obeys_the_callers_deadline() {
 	let services = RuntimeServices::new(
 		platform.clone(),
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -7286,7 +7259,7 @@ fn a_grant_lookup_obeys_the_callers_deadline() {
 /// say why.
 #[test]
 fn a_frontend_refusal_tells_the_host_what_it_judged_by() {
-	let host = dim2_with_a_pairing_session(stub_platform(), [0; 32]);
+	let host = dim2_with_a_pairing_session(stub_platform(), None);
 	let cx = CallContext::default();
 	let mut refusals = None;
 	let lines = crate::logging::testing::host_sink_lines(|| {
@@ -7326,7 +7299,7 @@ fn a_frontend_lookup_past_its_deadline_tells_the_host_it_timed_out() {
 	let proof_and_signature_lines = |cx: CallContext| {
 		let platform =
 			Arc::new(StubPlatform { chain_connect_pending: true, ..StubPlatform::default() });
-		let host = dim2_with_a_pairing_session(platform, [0xcc; 32]);
+		let host = dim2_with_a_pairing_session(platform, Some([0xcc; 32]));
 		crate::logging::testing::host_sink_lines(|| {
 			let _ = futures::executor::block_on(
 				host.create_account_proof(&cx, create_proof_request("peopl.dot")),
@@ -7356,7 +7329,7 @@ fn a_frontend_lookup_past_its_deadline_tells_the_host_it_timed_out() {
 fn a_refusal_past_the_frontend_is_warned_once() {
 	let platform = stub_platform();
 	cache_manifest(&platform, "peopl.dot", r#"{"dim2":["context"]}"#, 0);
-	let host = dim2_with_a_pairing_session(platform, [0; 32]);
+	let host = dim2_with_a_pairing_session(platform, None);
 	let HostAccountCreateProofRequest::V1(mut request) = create_proof_request("peopl.dot");
 	request.context.product_id = ProductId::for_test("dim2.paseo");
 	let lines = crate::logging::testing::host_sink_lines(|| {
@@ -7376,18 +7349,21 @@ fn a_refusal_past_the_frontend_is_warned_once() {
 }
 
 /// `dim2.dot` with a live pairing session, resolving manifests against
-/// `asset_hub_chain_genesis_hash`.
+/// `asset_hub`.
 fn dim2_with_a_pairing_session(
 	platform: Arc<StubPlatform>,
-	asset_hub_chain_genesis_hash: [u8; 32],
+	asset_hub: Option<[u8; 32]>,
 ) -> ProductRuntimeHost {
 	let (host_config, product) = runtime_config("dim2.dot");
 	let services = RuntimeServices::new(
 		platform,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		asset_hub_chain_genesis_hash,
+		crate::test_support::test_stack(
+			"paseo",
+			host_config.stack.chains().people,
+			host_config.stack.chains().bulletin,
+			asset_hub,
+		),
 		test_spawner(),
 	);
 	let pairing_host = PairingHost::new(services.clone(), host_config);
@@ -7578,9 +7554,7 @@ fn scanner_host_for(
 	let services = RuntimeServices::with_chat_platform(
 		stub_platform() as Arc<dyn Platform>,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 		None,
 	);
@@ -7805,9 +7779,7 @@ fn payment_services_over(platform: Arc<dyn Platform>) -> Arc<RuntimeServices> {
 	RuntimeServices::new(
 		platform,
 		host_config.host.host_info.clone(),
-		host_config.people_chain_genesis_hash,
-		host_config.bulletin_chain_genesis_hash,
-		host_config.asset_hub_chain_genesis_hash,
+		host_config.stack.clone(),
 		test_spawner(),
 	)
 }
diff --git a/rust/crates/truapi/src/stack.rs b/rust/crates/truapi/src/stack.rs
new file mode 100644
index 0000000000..b8ba7ef073
--- /dev/null
+++ b/rust/crates/truapi/src/stack.rs
@@ -0,0 +1,215 @@
+//! The Trinity stack a host runs, the core's only source of chain
+//! configuration.
+//!
+//! A host build bundles a signed descriptor and hands it to
+//! [`Stack::bundled`] with the stack's pointer. The resolved [`Stack`] answers
+//! `get_chain_info`, names the People, Bulletin and Asset Hub chains the core
+//! talks to, and carries the TLD the signing role derives identities under.
+
+use trinity_stack::{Pointer, open};
+use truapi::latest::{
+	ChainIdentifier, RemoteChainInfoError, RemoteChainInfoRequest, RemoteChainInfoResponse,
+};
+
+use crate::dotns_name::DOTNS_TLDS;
+
+/// Polkadot's genesis hashes for the chain roles the core reads, Relay, Asset
+/// Hub, People and Bulletin, in lowercase hex as PCF's signed Polkadot
+/// descriptor lists them.
+const RESERVED_GENESIS_HASHES: [&str; 4] = [
+	"91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3",
+	"68d56f15f85d3136970ec16946040bc1752654e906147f7e43e9d539d7c3de2f",
+	"67fa177a097bfa18f77ea95ab56e9bcdfeb0e5b8a40e46298bb93e16b6fc5008",
+	"2761c95259d59e55ae3daf756c1413b46e45a5a2987299f8ef8e5d8e4776cbc4",
+];
+
+/// Polkadot's dotNS TLD.
+const RESERVED_TLDS: [&str; 1] = ["dot"];
+
+/// The stack a host runs: the network `get_chain_info` reports, the dotNS TLD,
+/// and the genesis hash of each chain role the core uses.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Stack {
+	network: String,
+	tld: String,
+	chains: StackChains,
+}
+
+/// The genesis hash of each chain role a stack names. People and Bulletin are
+/// required: the core runs SSO and its own preimage submission over them.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct StackChains {
+	/// The relay chain.
+	pub relay: Option<[u8; 32]>,
+	/// Asset Hub, where the dotNS contracts are deployed. Without one, product
+	/// manifests and session usernames do not resolve.
+	pub asset_hub: Option<[u8; 32]>,
+	/// The People chain.
+	pub people: [u8; 32],
+	/// The Bulletin chain.
+	pub bulletin: [u8; 32],
+}
+
+/// Why a stack was refused.
+#[derive(Debug, PartialEq, derive_more::Display, derive_more::Error)]
+pub enum StackError {
+	/// The pointer is not a stack link.
+	#[display("stack pointer is not a stack link: {_0}")]
+	Pointer(#[error(not(source))] trinity_stack::Error),
+	/// The pointer carries no key. A host refreshes its stack unseen, so the
+	/// stack must be signed.
+	#[display("stack pointer has no key; a host's stack must be signed")]
+	Unsigned,
+	/// The bundled descriptor breaks a rule or does not verify under the
+	/// pointer's key.
+	#[display("bundled stack descriptor refused ({}): {_0}", _0.code())]
+	Descriptor(#[error(not(source))] trinity_stack::Error),
+	/// The descriptor has no chain with this role.
+	#[display("stack has no {role} chain")]
+	MissingChain {
+		/// The missing role, as descriptors name it.
+		role: &'static str,
+	},
+	/// The TLD is not one the core serves dotNS names under.
+	#[display("stack tld {tld:?} is not one of {}", DOTNS_TLDS.join(", "))]
+	UnsupportedTld {
+		/// The descriptor's TLD.
+		tld: String,
+	},
+	/// The stack uses one of Polkadot's genesis hashes or its TLD, and the host
+	/// build does not allow this stack to.
+	#[display("stack uses Polkadot's reserved {value}, which this build does not allow")]
+	Reserved {
+		/// The reserved value, as `genesis hash 0x…` or `tld dot`.
+		value: String,
+	},
+}
+
+impl Stack {
+	/// The stack a host build bundles: `pointer` is the stack's link, such as
+	/// `polkadotapp://stack?key=0x…&url=…`, and `descriptor` the bytes of the
+	/// copy the build verified.
+	///
+	/// Fails when the pointer has no key, when the descriptor does not verify
+	/// under it, when it has no People or Bulletin chain, when its TLD is not a
+	/// dotNS TLD the core serves, or when it names a reserved value and
+	/// `allows_reserved_values` is false. Expiry is not checked: a copy past
+	/// `expiresAt` still starts, since nothing fetches a newer one yet.
+	pub fn bundled(
+		pointer: &str,
+		descriptor: &[u8],
+		allows_reserved_values: bool,
+	) -> Result<Self, StackError> {
+		let pointer = Pointer::from_link(pointer).map_err(StackError::Pointer)?;
+		if pointer.key().is_none() {
+			return Err(StackError::Unsigned);
+		}
+		let descriptor = open(descriptor, &pointer).map_err(StackError::Descriptor)?.descriptor;
+		let genesis_of =
+			|role: &str| descriptor.chain(role).map(|chain| genesis(&chain.genesis_hash));
+		if !allows_reserved_values {
+			for chain in &descriptor.chains {
+				refuse_reserved_genesis(genesis(&chain.genesis_hash))?;
+			}
+		}
+		let chains = StackChains {
+			relay: genesis_of("Relay"),
+			asset_hub: genesis_of("AssetHub"),
+			people: genesis_of("People").ok_or(StackError::MissingChain { role: "People" })?,
+			bulletin: genesis_of("Bulletin")
+				.ok_or(StackError::MissingChain { role: "Bulletin" })?,
+		};
+		Self::new(descriptor.network, descriptor.tld, chains, allows_reserved_values)
+	}
+
+	/// A stack from values a Rust host resolved itself, such as the CLI from a
+	/// local-network file. Native and browser hosts reach only
+	/// [`Self::bundled`].
+	///
+	/// Applies the same TLD and reserved-value rules as [`Self::bundled`].
+	pub fn new(
+		network: String,
+		tld: String,
+		chains: StackChains,
+		allows_reserved_values: bool,
+	) -> Result<Self, StackError> {
+		if !DOTNS_TLDS.contains(&tld.as_str()) {
+			return Err(StackError::UnsupportedTld { tld });
+		}
+		if !allows_reserved_values {
+			if RESERVED_TLDS.contains(&tld.as_str()) {
+				return Err(StackError::Reserved { value: format!("tld {tld}") });
+			}
+			let StackChains { relay, asset_hub, people, bulletin } = &chains;
+			for hash in [relay, asset_hub].into_iter().flatten().chain([people, bulletin]) {
+				refuse_reserved_genesis(*hash)?;
+			}
+		}
+		Ok(Self { network, tld, chains })
+	}
+
+	/// The ecosystem `get_chain_info` reports, such as `polkadot` or `paseo`.
+	pub fn network(&self) -> &str {
+		&self.network
+	}
+
+	/// The dotNS TLD without the leading dot. The signing role derives every
+	/// reserved RFC-0022 identity under it: `uid.<tld>` for the identity
+	/// account, `peopl.<tld>` for the person ring-VRF keys.
+	pub fn tld(&self) -> &str {
+		&self.tld
+	}
+
+	/// The stack's chains.
+	pub fn chains(&self) -> &StackChains {
+		&self.chains
+	}
+
+	/// The genesis hash of the chain with this role, or `None` when the stack
+	/// has no such chain.
+	pub fn genesis_hash(&self, chain: ChainIdentifier) -> Option<[u8; 32]> {
+		let StackChains { relay, asset_hub, people, bulletin } = self.chains;
+		match chain {
+			ChainIdentifier::Relay => relay,
+			ChainIdentifier::AssetHub => asset_hub,
+			ChainIdentifier::People => Some(people),
+			ChainIdentifier::Bulletin => Some(bulletin),
+		}
+	}
+
+	/// Answers `get_chain_info` (RFC 0026): the requested chain's genesis hash
+	/// and the stack's network, or `NotSupported` when the stack has no such
+	/// chain.
+	pub fn chain_info(
+		&self,
+		request: &RemoteChainInfoRequest,
+	) -> Result<RemoteChainInfoResponse, RemoteChainInfoError> {
+		self.genesis_hash(request.chain)
+			.map(|genesis_hash| RemoteChainInfoResponse {
+				network: self.network.clone(),
+				chain: request.chain,
+				genesis_hash,
+			})
+			.ok_or(RemoteChainInfoError::NotSupported)
+	}
+}
+
+fn refuse_reserved_genesis(hash: [u8; 32]) -> Result<(), StackError> {
+	let hex_hash = hex::encode(hash);
+	match RESERVED_GENESIS_HASHES.contains(&hex_hash.as_str()) {
+		true => Err(StackError::Reserved { value: format!("genesis hash 0x{hex_hash}") }),
+		false => Ok(()),
+	}
+}
+
+/// A genesis hash from a descriptor, which `trinity-stack` has already checked
+/// is 32 bytes of 0x-prefixed lowercase hex.
+fn genesis(hex_hash: &str) -> [u8; 32] {
+	let mut hash = [0; 32];
+	hex::decode_to_slice(hex_hash.trim_start_matches("0x"), &mut hash)
+		.expect("trinity-stack validated genesisHash as 32 bytes of hex");
+	hash
+}
+
+#[cfg(test)]
+mod tests;
diff --git a/rust/crates/truapi/src/stack/tests.rs b/rust/crates/truapi/src/stack/tests.rs
new file mode 100644
index 0000000000..23abc82bec
--- /dev/null
+++ b/rust/crates/truapi/src/stack/tests.rs
@@ -0,0 +1,158 @@
+use super::*;
+use crate::test_support::{sign_test_descriptor, test_descriptor, test_descriptor_chain};
+
+const POLKADOT_PEOPLE: [u8; 32] = [
+	0x67, 0xfa, 0x17, 0x7a, 0x09, 0x7b, 0xfa, 0x18, 0xf7, 0x7e, 0xa9, 0x5a, 0xb5, 0x6e, 0x9b, 0xcd,
+	0xfe, 0xb0, 0xe5, 0xb8, 0xa4, 0x0e, 0x46, 0x29, 0x8b, 0xb9, 0x3e, 0x16, 0xb6, 0xfc, 0x50, 0x08,
+];
+
+fn bundled(
+	descriptor: &serde_json::Value,
+	allows_reserved_values: bool,
+) -> Result<Stack, StackError> {
+	let (pointer, bytes) = sign_test_descriptor(descriptor);
+	Stack::bundled(&pointer, &bytes, allows_reserved_values)
+}
+
+fn info(
+	stack: &Stack,
+	chain: ChainIdentifier,
+) -> Result<RemoteChainInfoResponse, RemoteChainInfoError> {
+	stack.chain_info(&RemoteChainInfoRequest { chain })
+}
+
+/// `get_chain_info` answers from the descriptor, so every host reports the
+/// same chains and network for a stack.
+#[test]
+fn a_bundled_stack_answers_get_chain_info_from_its_descriptor() {
+	let stack = bundled(&test_descriptor("paseo", [0xa1; 32], [0xb2; 32], None), false)
+		.expect("stack is valid");
+
+	let response = |chain, genesis_hash| {
+		Ok(RemoteChainInfoResponse { network: "paseo".to_string(), chain, genesis_hash })
+	};
+	assert_eq!(
+		[
+			ChainIdentifier::Relay,
+			ChainIdentifier::People,
+			ChainIdentifier::Bulletin,
+			ChainIdentifier::AssetHub
+		]
+		.map(|chain| info(&stack, chain)),
+		[
+			response(ChainIdentifier::Relay, [0x01; 32]),
+			response(ChainIdentifier::People, [0xa1; 32]),
+			response(ChainIdentifier::Bulletin, [0xb2; 32]),
+			Err(RemoteChainInfoError::NotSupported),
+		]
+	);
+}
+
+/// A host refreshes its stack unseen, so a pointer with no key to check a
+/// refresh against is refused even when the bundled copy is signed.
+#[test]
+fn a_pointer_without_a_key_is_refused() {
+	let (_, bytes) = sign_test_descriptor(&test_descriptor("paseo", [0xa1; 32], [0xb2; 32], None));
+	let pointer = "polkadotapp://stack?url=https%3A%2F%2Fstack.test.invalid%2Fstack.json";
+
+	assert_eq!(Stack::bundled(pointer, &bytes, false), Err(StackError::Unsigned));
+}
+
+/// The pointer's key is the trust anchor: a copy signed by anyone else does
+/// not start, whatever it claims.
+#[test]
+fn a_copy_signed_by_another_key_is_refused() {
+	let (_, bytes) = sign_test_descriptor(&test_descriptor("paseo", [0xa1; 32], [0xb2; 32], None));
+	let other_key = format!("0x{}", hex::encode(trinity_stack::public_key(&[0x42; 32])));
+	let pointer = Pointer::new("https://stack.test.invalid/stack.json", Some(&other_key))
+		.expect("pointer is valid")
+		.to_link(trinity_stack::DEFAULT_LINK_BASE);
+
+	let refused = Stack::bundled(&pointer, &bytes, false).expect_err("another key's copy");
+	assert!(
+		matches!(&refused, StackError::Descriptor(error) if error.code() == "bad-signature"),
+		"{refused:?}"
+	);
+}
+
+/// SSO runs over People and in-core preimages go to Bulletin, so a stack
+/// without either cannot start a host.
+#[test]
+fn a_stack_without_people_or_bulletin_is_refused() {
+	let mut descriptor = test_descriptor("paseo", [0xa1; 32], [0xb2; 32], None);
+	descriptor["chains"] = serde_json::json!([
+		test_descriptor_chain("Relay", [0x01; 32], None),
+		test_descriptor_chain("People", [0xa1; 32], Some(1004))
+	]);
+
+	assert_eq!(bundled(&descriptor, false), Err(StackError::MissingChain { role: "Bulletin" }));
+}
+
+/// Products are named under the TLDs the core serves dotNS for. Until that
+/// list comes from the stack, a stack on any other TLD cannot host products.
+#[test]
+fn a_tld_the_core_does_not_serve_is_refused() {
+	let chains =
+		|| StackChains { relay: None, asset_hub: None, people: [0xa1; 32], bulletin: [0xb2; 32] };
+
+	assert_eq!(
+		["kusama", "", ".paseo", "Paseo"].map(|tld| Stack::new(
+			"paseo".into(),
+			tld.into(),
+			chains(),
+			true
+		)
+		.err()),
+		["kusama", "", ".paseo", "Paseo"]
+			.map(|tld| Some(StackError::UnsupportedTld { tld: tld.to_string() })),
+	);
+	assert_eq!(
+		bundled(&test_descriptor("kusama", [0xa1; 32], [0xb2; 32], None), false),
+		Err(StackError::UnsupportedTld { tld: "kusama".to_string() })
+	);
+}
+
+/// Only a build that vouches for a stack may give it Polkadot's names: the
+/// `dot` TLD, or a Polkadot genesis hash under any role, including ones the
+/// core never reads.
+#[test]
+fn reserved_values_need_the_builds_permission() {
+	let on_dot = test_descriptor("dot", [0xa1; 32], [0xb2; 32], None);
+	let mut polkadot_people_as_another_role =
+		test_descriptor("paseo", [0xa1; 32], [0xb2; 32], None);
+	polkadot_people_as_another_role["chains"]
+		.as_array_mut()
+		.expect("chains is an array")
+		.push(test_descriptor_chain("Collectives", POLKADOT_PEOPLE, Some(1001)));
+	let polkadot_people = format!("genesis hash 0x{}", hex::encode(POLKADOT_PEOPLE));
+
+	assert_eq!(
+		[&on_dot, &polkadot_people_as_another_role].map(|descriptor| {
+			(bundled(descriptor, false).err(), bundled(descriptor, true).is_ok())
+		}),
+		[
+			(Some(StackError::Reserved { value: "tld dot".to_string() }), true),
+			(Some(StackError::Reserved { value: polkadot_people }), true),
+		]
+	);
+}
+
+/// A stack a Rust host resolves itself meets the same reserved-value rule.
+#[test]
+fn a_stack_from_parts_is_held_to_the_reserved_values() {
+	let chains =
+		StackChains { relay: None, asset_hub: None, people: POLKADOT_PEOPLE, bulletin: [0xb2; 32] };
+
+	assert_eq!(
+		(
+			Stack::new("polkadot".into(), "paseo".into(), chains.clone(), false).err(),
+			Stack::new("polkadot".into(), "paseo".into(), chains, true).is_ok(),
+		),
+		(
+			Some(StackError::Reserved {
+				value: format!("genesis hash 0x{}", hex::encode(POLKADOT_PEOPLE))
+			}),
+			true,
+		)
+	);
+}
diff --git a/rust/crates/truapi/src/test_support.rs b/rust/crates/truapi/src/test_support.rs
index b0c1c91aec..1492d2dc84 100644
--- a/rust/crates/truapi/src/test_support.rs
+++ b/rust/crates/truapi/src/test_support.rs
@@ -343,6 +343,77 @@ pub fn stub_platform() -> Arc<StubPlatform> {
 	Arc::new(StubPlatform::default())
 }
 
+/// A stack on `tld` over these chains, without a relay. Reserved values are
+/// allowed, so a test may run on `dot`.
+pub fn test_stack(
+	tld: &str,
+	people: [u8; 32],
+	bulletin: [u8; 32],
+	asset_hub: Option<[u8; 32]>,
+) -> crate::platform::Stack {
+	let chains = crate::platform::StackChains { relay: None, asset_hub, people, bulletin };
+	crate::platform::Stack::new("paseo".to_string(), tld.to_string(), chains, true)
+		.expect("test stack is valid")
+}
+
+/// The key [`sign_test_descriptor`] signs with.
+pub const TEST_STACK_SECRET: [u8; 32] = [0x5e; 32];
+
+/// A descriptor for a stack on `tld` over a relay and these chains, ready for
+/// [`sign_test_descriptor`].
+pub fn test_descriptor(
+	tld: &str,
+	people: [u8; 32],
+	bulletin: [u8; 32],
+	asset_hub: Option<[u8; 32]>,
+) -> serde_json::Value {
+	let mut chains = vec![
+		test_descriptor_chain("Relay", [0x01; 32], None),
+		test_descriptor_chain("People", people, Some(1004)),
+		test_descriptor_chain("Bulletin", bulletin, Some(1010)),
+	];
+	chains.extend(asset_hub.map(|genesis| test_descriptor_chain("AssetHub", genesis, Some(1000))));
+	serde_json::json!({
+		"$v": 1,
+		"sequence": 1,
+		"generation": "test",
+		"id": "test",
+		"name": "Test",
+		"network": "paseo",
+		"tld": tld,
+		"chains": chains,
+		"services": [],
+	})
+}
+
+/// One `chains` entry of a test descriptor.
+pub fn test_descriptor_chain(
+	role: &str,
+	genesis: [u8; 32],
+	para_id: Option<u32>,
+) -> serde_json::Value {
+	let mut chain = serde_json::json!({
+		"role": role,
+		"genesisHash": format!("0x{}", hex::encode(genesis)),
+		"rpc": ["wss://rpc.test.invalid"],
+	});
+	if let Some(para_id) = para_id {
+		chain["paraId"] = para_id.into();
+	}
+	chain
+}
+
+/// `descriptor` signed with [`TEST_STACK_SECRET`], and the pointer link that
+/// verifies it.
+pub fn sign_test_descriptor(descriptor: &serde_json::Value) -> (String, Vec<u8>) {
+	let bytes = serde_json::to_vec(descriptor).expect("a JSON value serialises");
+	let signed = trinity_stack::sign(&bytes, &TEST_STACK_SECRET).expect("test descriptor is valid");
+	let key = format!("0x{}", hex::encode(trinity_stack::public_key(&TEST_STACK_SECRET)));
+	let pointer = trinity_stack::Pointer::new("https://stack.test.invalid/stack.json", Some(&key))
+		.expect("test pointer is valid");
+	(pointer.to_link(trinity_stack::DEFAULT_LINK_BASE), signed)
+}
+
 /// Runtime configuration used by platform-backed runtime tests.
 pub fn runtime_config(product_id: &str) -> (PairingHostConfig, ProductContext) {
 	(
@@ -354,9 +425,7 @@ pub fn runtime_config(product_id: &str) -> (PairingHostConfig, ProductContext) {
 				platform: truapi::latest::HostPlatform::Web,
 			},
 			PlatformInfo::default(),
-			[0; 32],
-			[0xbb; 32],
-			[0xcc; 32],
+			crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 			"polkadotapp".to_string(),
 		)
 		.expect("test host runtime config is valid"),
@@ -409,9 +478,7 @@ pub fn sso_host_and_responder_sessions() -> (SsoSessionInfo, SsoSessionInfo) {
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		[0xcc; 32],
+		crate::test_support::test_stack("paseo", [0; 32], [0xbb; 32], Some([0xcc; 32])),
 		"polkadotapp".to_string(),
 	)
 	.expect("test pairing config is valid");
@@ -1271,22 +1338,6 @@ impl PlatformFeatures for StubPlatform {
 	) -> Result<v01::HostFeatureSupportedResponse, v01::GenericError> {
 		Ok(v01::HostFeatureSupportedResponse { supported: true })
 	}
-
-	async fn supported_chains(&self) -> Result<crate::platform::HostChainSet, v01::GenericError> {
-		Ok(crate::platform::HostChainSet {
-			network: "paseo".to_string(),
-			chains: vec![
-				crate::platform::HostChainEntry {
-					identifier: v01::ChainIdentifier::AssetHub,
-					genesis_hash: [0xaa; 32],
-				},
-				crate::platform::HostChainEntry {
-					identifier: v01::ChainIdentifier::People,
-					genesis_hash: [0x22; 32],
-				},
-			],
-		})
-	}
 }
 
 struct RecordingConnection {
diff --git a/rust/crates/truapi/src/truapi_core.rs b/rust/crates/truapi/src/truapi_core.rs
index 86356537cc..916e362428 100644
--- a/rust/crates/truapi/src/truapi_core.rs
+++ b/rust/crates/truapi/src/truapi_core.rs
@@ -59,9 +59,7 @@ impl TrUApiCore {
 		let services = RuntimeServices::new(
 			platform,
 			host_config.host.host_info.clone(),
-			host_config.people_chain_genesis_hash,
-			host_config.bulletin_chain_genesis_hash,
-			host_config.asset_hub_chain_genesis_hash,
+			host_config.stack.clone(),
 			spawner.clone(),
 		);
 		let pairing_host = PairingHostRole::new(services.clone(), host_config);
diff --git a/rust/crates/truapi/src/wasm.rs b/rust/crates/truapi/src/wasm.rs
index 9f2d68d832..b8a2ef7bb8 100644
--- a/rust/crates/truapi/src/wasm.rs
+++ b/rust/crates/truapi/src/wasm.rs
@@ -24,11 +24,13 @@ use std::{
 
 #[cfg(feature = "wasm-signing-host")]
 use crate::platform::SigningHostConfig;
+#[cfg(feature = "test-host")]
+use crate::platform::StackChains;
 use crate::platform::{
 	ChainProvider, ChatPlatform, ContactsPlatform, ExecutableKind, GamePlatform, HostInfo,
 	JsonRpcConnection, PairingHostConfig, PermissionStatusHost, PlatformInfo, PocketPlatform,
 	ProductContext, ProductId, ProductIdError, ProviderError, RuntimeConfigValidationError,
-	ScannerPlatform,
+	ScannerPlatform, Stack,
 };
 use futures::{
 	channel::mpsc,
@@ -494,9 +496,6 @@ fn pairing_host_config_from_js(value: &JsValue) -> Result<PairingHostConfig, JsV
 
 	let host = get_required_object(value, "host", "runtimeConfig.host")?;
 	let platform = get_optional_object(value, "platform", "runtimeConfig.platform")?;
-	let people = get_required_object(value, "people", "runtimeConfig.people")?;
-	let bulletin = get_required_object(value, "bulletin", "runtimeConfig.bulletin")?;
-	let asset_hub = get_required_object(value, "assetHub", "runtimeConfig.assetHub")?;
 	let pairing = get_required_object(value, "pairing", "runtimeConfig.pairing")?;
 
 	PairingHostConfig::new(
@@ -522,9 +521,7 @@ fn pairing_host_config_from_js(value: &JsValue) -> Result<PairingHostConfig, JsV
 				.transpose()?
 				.flatten(),
 		},
-		get_required_bytes32_at(&people, "genesisHash", "runtimeConfig.people.genesisHash")?,
-		get_required_bytes32_at(&bulletin, "genesisHash", "runtimeConfig.bulletin.genesisHash")?,
-		get_required_bytes32_at(&asset_hub, "genesisHash", "runtimeConfig.assetHub.genesisHash")?,
+		stack_from_js(value)?,
 		get_required_string_at(&pairing, "deeplinkScheme", "runtimeConfig.pairing.deeplinkScheme")?,
 	)
 	.map_err(runtime_config_validation_to_js)
@@ -555,12 +552,6 @@ fn signing_host_config_from_js(value: &JsValue) -> Result<SigningHostConfig, JsV
 
 	let host = get_required_object(value, "host", "runtimeConfig.host")?;
 	let platform = get_optional_object(value, "platform", "runtimeConfig.platform")?;
-	let people = get_required_object(value, "people", "runtimeConfig.people")?;
-	let bulletin = get_required_object(value, "bulletin", "runtimeConfig.bulletin")?;
-	let asset_hub = get_required_object(value, "assetHub", "runtimeConfig.assetHub")?;
-	let network_suffix =
-		get_required_string_at(value, "networkSuffix", "runtimeConfig.networkSuffix")?;
-
 	SigningHostConfig::new(
 		HostInfo {
 			name: get_required_string_at(&host, "name", "runtimeConfig.host.name")?,
@@ -584,14 +575,73 @@ fn signing_host_config_from_js(value: &JsValue) -> Result<SigningHostConfig, JsV
 				.transpose()?
 				.flatten(),
 		},
-		get_required_bytes32_at(&people, "genesisHash", "runtimeConfig.people.genesisHash")?,
-		get_required_bytes32_at(&bulletin, "genesisHash", "runtimeConfig.bulletin.genesisHash")?,
-		get_required_bytes32_at(&asset_hub, "genesisHash", "runtimeConfig.assetHub.genesisHash")?,
-		network_suffix,
+		stack_from_js(value)?,
 	)
 	.map_err(runtime_config_validation_to_js)
 }
 
+/// The stack `runtimeConfig` names: `stack`, the pointer and descriptor copy a
+/// host build bundles, or, in a test-host build only, `testStack`, built from
+/// its parts because a test host has no descriptor to bundle.
+fn stack_from_js(value: &JsValue) -> Result<Stack, JsValue> {
+	#[cfg(feature = "test-host")]
+	if let Some(test_stack) = get_optional_object(value, "testStack", "runtimeConfig.testStack")? {
+		return test_stack_from_js(&test_stack);
+	}
+	let stack = get_required_object(value, "stack", "runtimeConfig.stack")?;
+	let pointer = get_required_string_at(&stack, "pointer", "runtimeConfig.stack.pointer")?;
+	let descriptor = Reflect::get(&stack, &JsValue::from_str("descriptor"))?
+		.dyn_into::<Uint8Array>()
+		.map_err(|_| JsValue::from_str("runtimeConfig.stack.descriptor must be a Uint8Array"))?
+		.to_vec();
+	let allows_reserved_values = get_optional_bool_at(
+		&stack,
+		"allowsReservedValues",
+		"runtimeConfig.stack.allowsReservedValues",
+	)?
+	.unwrap_or(false);
+	Stack::bundled(&pointer, &descriptor, allows_reserved_values)
+		.map_err(|error| JsValue::from_str(&format!("runtimeConfig.stack: {error}")))
+}
+
+/// `runtimeConfig.testStack`: `network`, `tld`, `people`, `bulletin` and the
+/// optional `assetHub` and `relay`, each `{ genesisHash }`, and
+/// `allowsReservedValues`, which defaults to false.
+#[cfg(feature = "test-host")]
+fn test_stack_from_js(stack: &JsValue) -> Result<Stack, JsValue> {
+	let genesis = |role: &str| {
+		let path = format!("runtimeConfig.testStack.{role}");
+		get_optional_object(stack, role, &path)?
+			.map(|chain| {
+				get_required_bytes32_at(&chain, "genesisHash", &format!("{path}.genesisHash"))
+			})
+			.transpose()
+	};
+	let required = |role: &str| {
+		genesis(role)?.ok_or_else(|| {
+			JsValue::from_str(&format!("runtimeConfig.testStack.{role} is required"))
+		})
+	};
+	let chains = StackChains {
+		relay: genesis("relay")?,
+		asset_hub: genesis("assetHub")?,
+		people: required("people")?,
+		bulletin: required("bulletin")?,
+	};
+	Stack::new(
+		get_required_string_at(stack, "network", "runtimeConfig.testStack.network")?,
+		get_required_string_at(stack, "tld", "runtimeConfig.testStack.tld")?,
+		chains,
+		get_optional_bool_at(
+			stack,
+			"allowsReservedValues",
+			"runtimeConfig.testStack.allowsReservedValues",
+		)?
+		.unwrap_or(false),
+	)
+	.map_err(|error| JsValue::from_str(&format!("runtimeConfig.testStack: {error}")))
+}
+
 fn product_context_from_js(value: &JsValue) -> Result<ProductContext, JsValue> {
 	if value.is_null() || value.is_undefined() {
 		return Err(JsValue::from_str("product is required"));
@@ -620,10 +670,6 @@ fn runtime_config_field_to_js(field: &str) -> &str {
 	match field {
 		"host_info.name" => "host.name",
 		"pairing_deeplink_scheme" => "pairing.deeplinkScheme",
-		"people_chain_genesis_hash" => "people.genesisHash",
-		"bulletin_chain_genesis_hash" => "bulletin.genesisHash",
-		"asset_hub_chain_genesis_hash" => "assetHub.genesisHash",
-		"network_suffix" => "networkSuffix",
 		other => other,
 	}
 }
@@ -659,11 +705,6 @@ fn runtime_config_validation_to_js(err: RuntimeConfigValidationError) -> JsValue
 		}) => JsValue::from_str(&format!(
 			"runtimeConfig.productId must be at most {limit} bytes, got {actual}"
 		)),
-		RuntimeConfigValidationError::InvalidNetworkSuffix { network_suffix } => {
-			JsValue::from_str(&format!(
-				"runtimeConfig.networkSuffix must be a supported dotNS TLD, got {network_suffix:?}"
-			))
-		},
 	}
 }
 
@@ -708,11 +749,23 @@ fn get_optional_string_at(
 		.ok_or_else(|| JsValue::from_str(&format!("{path} must be a string")))
 }
 
+fn get_optional_bool_at(value: &JsValue, name: &str, path: &str) -> Result<Option<bool>, JsValue> {
+	let property = Reflect::get(value, &JsValue::from_str(name))?;
+	if property.is_null() || property.is_undefined() {
+		return Ok(None);
+	}
+	property
+		.as_bool()
+		.map(Some)
+		.ok_or_else(|| JsValue::from_str(&format!("{path} must be a boolean")))
+}
+
 fn get_required_string_at(value: &JsValue, name: &str, path: &str) -> Result<String, JsValue> {
 	get_optional_string_at(value, name, path)?
 		.ok_or_else(|| JsValue::from_str(&format!("{path} is required")))
 }
 
+#[cfg(feature = "test-host")]
 fn get_optional_bytes32_at(
 	value: &JsValue,
 	name: &str,
@@ -736,11 +789,13 @@ fn get_optional_bytes32_at(
 	})
 }
 
+#[cfg(feature = "test-host")]
 fn get_required_bytes32_at(value: &JsValue, name: &str, path: &str) -> Result<[u8; 32], JsValue> {
 	get_optional_bytes32_at(value, name, path)?
 		.ok_or_else(|| JsValue::from_str(&format!("{path} is required")))
 }
 
+#[cfg(feature = "test-host")]
 fn parse_hex32(value: &str) -> Result<[u8; 32], String> {
 	let raw = value.strip_prefix("0x").unwrap_or(value);
 	if raw.len() != 64 {
diff --git a/rust/crates/truapi/tests/common/mod.rs b/rust/crates/truapi/tests/common/mod.rs
index 89a6d33005..201b332d47 100644
--- a/rust/crates/truapi/tests/common/mod.rs
+++ b/rust/crates/truapi/tests/common/mod.rs
@@ -24,9 +24,7 @@ pub fn test_runtime_config() -> (PairingHostConfig, ProductContext) {
 				platform: truapi::latest::HostPlatform::Web,
 			},
 			PlatformInfo::default(),
-			[0xa2; 32],
-			[0xbb; 32],
-			[0xcc; 32],
+			truapi::platform::mock::mock_stack([0xa2; 32], [0xbb; 32], Some([0xcc; 32])),
 			"polkadotapp".to_string(),
 		)
 		.expect("test host runtime config is valid"),
@@ -128,16 +126,6 @@ impl Features for WireShapePlatform {
 	) -> Result<v01::HostFeatureSupportedResponse, v01::GenericError> {
 		Ok(v01::HostFeatureSupportedResponse { supported: true })
 	}
-
-	async fn supported_chains(&self) -> Result<truapi::platform::HostChainSet, v01::GenericError> {
-		Ok(truapi::platform::HostChainSet {
-			network: "paseo".to_string(),
-			chains: vec![truapi::platform::HostChainEntry {
-				identifier: v01::ChainIdentifier::AssetHub,
-				genesis_hash: [0xaa; 32],
-			}],
-		})
-	}
 }
 
 struct DeadConnection;
diff --git a/rust/crates/truapi/tests/platform_bounds.rs b/rust/crates/truapi/tests/platform_bounds.rs
index cb4681aa88..ff7fe53dda 100644
--- a/rust/crates/truapi/tests/platform_bounds.rs
+++ b/rust/crates/truapi/tests/platform_bounds.rs
@@ -95,9 +95,7 @@ fn pairing_config_validation_cases() {
 				platform: truapi::latest::HostPlatform::Web,
 			},
 			PlatformInfo::default(),
-			[0xa2; 32],
-			[0xbb; 32],
-			[0xcc; 32],
+			truapi::platform::mock::mock_stack([0xa2; 32], [0xbb; 32], Some([0xcc; 32])),
 			case.pairing_deeplink_scheme.to_string(),
 		)
 		.map(|_| ());
diff --git a/rust/crates/truapi/tests/signing_host_mock_platform.rs b/rust/crates/truapi/tests/signing_host_mock_platform.rs
index ccb2abc215..19d5f11d44 100644
--- a/rust/crates/truapi/tests/signing_host_mock_platform.rs
+++ b/rust/crates/truapi/tests/signing_host_mock_platform.rs
@@ -97,11 +97,7 @@ fn signing_config() -> SigningHostConfig {
 			platform: truapi::latest::HostPlatform::Unknown,
 		},
 		PlatformInfo::default(),
-		[0; 32],
-		[0xbb; 32],
-		// No dotNS Asset Hub, so activation looks up no username.
-		[0; 32],
-		"paseo".to_string(),
+		truapi::platform::mock::mock_stack([0; 32], [0xbb; 32], None),
 	)
 	.expect("signing host config is valid")
 }
diff --git a/rust/crates/truapi/tests/wasm_crypto_vectors.rs b/rust/crates/truapi/tests/wasm_crypto_vectors.rs
index a670302349..a5d646d899 100644
--- a/rust/crates/truapi/tests/wasm_crypto_vectors.rs
+++ b/rust/crates/truapi/tests/wasm_crypto_vectors.rs
@@ -52,9 +52,7 @@ fn runtime_config() -> PairingHostConfig {
 			platform: truapi::latest::HostPlatform::Web,
 		},
 		PlatformInfo { kind: Some("Firefox".to_string()), version: Some("192.32".to_string()) },
-		[0xa2; 32],
-		[0xbb; 32],
-		[0xcc; 32],
+		truapi::platform::mock::mock_stack([0xa2; 32], [0xbb; 32], Some([0xcc; 32])),
 		"polkadotapp".to_string(),
 	)
 	.expect("test runtime config is valid")
diff --git a/rust/crates/truapi/tests/wire_result_shape.rs b/rust/crates/truapi/tests/wire_result_shape.rs
index faa419c899..de860d26bf 100644
--- a/rust/crates/truapi/tests/wire_result_shape.rs
+++ b/rust/crates/truapi/tests/wire_result_shape.rs
@@ -147,9 +147,9 @@ fn get_chain_info_ok_response_round_trips_over_the_wire() {
 		truapi::versioned::chain::RemoteChainInfoResponse,
 		CallError<truapi::versioned::chain::RemoteChainInfoError>,
 	> = Ok(truapi::versioned::chain::RemoteChainInfoResponse::V1(v01::RemoteChainInfoResponse {
-		network: "paseo".to_string(),
+		network: "mock".to_string(),
 		chain: v01::ChainIdentifier::AssetHub,
-		genesis_hash: [0xaa; 32],
+		genesis_hash: [0xcc; 32],
 	}));
 	assert_eq!(response.payload.value, expected.encode());
 }
@@ -157,7 +157,8 @@ fn get_chain_info_ok_response_round_trips_over_the_wire() {
 #[test]
 fn get_chain_info_unserved_chain_uses_err_discriminant() {
 	let core = make_core();
-	let request = v01::RemoteChainInfoRequest { chain: v01::ChainIdentifier::Bulletin };
+	// The test stack has no relay.
+	let request = v01::RemoteChainInfoRequest { chain: v01::ChainIdentifier::Relay };
 	let ids = request_ids("chain_get_chain_info").expect("known request method");
 	let frame = ProtocolMessage {
 		request_id: "p:10".into(),