Solidity — Smart Contract Development

A hands-on portfolio of Solidity smart contracts across the main Ethereum token standards and common contract patterns.

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Overview

A portfolio of Solidity smart contracts built while developing blockchain skills end to end: writing, compiling, testing, and deploying contracts that follow established standards and security patterns. The contracts use OpenZeppelin libraries and progress from basics to multi-token systems and a simple marketplace.

What's inside

• contracts/
  • Basics_01.sol, SmartContract_1.sol … SmartContract_23.sol — a progression of exercises with increasing complexity, from a minimal ERC-20 token to an ERC-1155 multi-token with custom errors and Ownable access control.
  • Tokens/ — ANTM_ERC20.sol, ANTM_NFT.sol (ERC-721), Marketplace.sol.
  • Otros/ — canonical examples: Storage, Owner, Ballot.
  • Otros_ConqueBlocks/ — bootcamp exercises (Bank, HotelRoom, Vending Machine, visibility and memory patterns).
• scripts/ — deployment scripts using ethers.js and web3.js.
• tests/ — unit tests (Solidity + JS / Mocha-Chai).

Standards & patterns covered

Standard / pattern	Where
ERC-20 (fungible tokens)	SmartContract_1.sol, Tokens/ANTM_ERC20.sol
ERC-721 (NFTs)	Tokens/ANTM_NFT.sol
ERC-1155 (multi-token)	SmartContract_20.sol
Marketplace	Tokens/Marketplace.sol
Access control / custom errors	Ownable, revert-based error handling

Tech Stack

Solidity ^0.8 · OpenZeppelin · Remix / Hardhat · ethers.js · web3.js.

Learning-focused repository: practice and reference implementations of ERC standards and common patterns, not audited production code.