Silent Payments - Phase1#1
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Reject non-int and reserved/out-of-range labels (m=0 is change), drop the non-standard str/bytes label support, correct swapped scan/spend keys in the network test, and apply black formatting.
- Subclass EmbitError so existing except EmbitError callers still catch malformed-address errors (e.g. script.address_to_scriptpubkey). - Restore the BIP-141 2-40 byte witness program limit in decode() and drop the sp/tsp special-casing; SP addresses are not witness programs. - Replace the 118 length cap with BIP-352's recommended 1023 so valid higher-version silent payment addresses decode; cite BIP-173/BIP-352. - Drop the no-placeholder f-string and the encode() try/except that masked the original Bech32DecodeError.
Drop the typing and collections imports (Counter/defaultdict, Tuple/List/Dict) and convert COutPoint from typing.NamedTuple to a plain class with positional int.to_bytes. Replace remaining f-strings with str.format and remove the now unused COutPoint import from bip352.
- Remove bech32_decode_long; the flexible bech32_decode (this branch) already
handles long strings, so decode SP keys and silent payment addresses through
it, converting Bech32DecodeError to the caller's error type.
- Drop the now-dead 'is None' guards (convertbits raises instead of returning
None) and wrap conversion to keep DescriptorError/ValueError consistent.
- Seek to an absolute offset after 'sp(' so parsing is robust to a short read.
- Raise a clear DescriptorError for unsupported address/derive/script_pubkey on
SilentPaymentDescriptor, and cover the Descriptor.from_string('sp(...)') path.
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This PR integrates PRs diybitcoinhardware#64, diybitcoinhardware#95, diybitcoinhardware#96 and diybitcoinhardware#130.
Each commit was sequentially rebased, reviewed and has, fixes, tightening to specs, merge conflicts and integration solved, DRY and older micropython syntax compatibility ensured.
Authorship from @kdmukai and @notTanveer preserved.