Web3 & Smart Contracts PUDO Checklist

1. PLAN (Architecture & Strategy)

• Protocol Design: Define contract architecture (e.g., Monolithic vs. Proxy/Upgradable vs. Diamond pattern).
• Tokenomics: Map out value flow, minting, burning, and pausing capabilities (ERC20/ERC721/ERC1155).
• Access Control: Plan roles (Owner, Admin, Minter) and multisig requirements.
• Gas Economics: Architect data structures to minimize storage operations (packing variables).

2. UNDERSTAND (Context & Auditing)

• Dependencies: Validate versions of inherited libraries (e.g., OpenZeppelin Contracts).
• External Interactions: Map all calls to external, untrusted contracts (risk of reentrancy).
• State Changes: Understand the lifecycle of state variables over the contract's active period.

3. DEVELOP (Implementation)

• CEI Pattern: STRICTLY adhere to Checks-Effects-Interactions pattern for all state-mutating functions.
• Modifiers: Use modifiers for access control and validation logically without bloating gas.
• Events: Emit events for all significant state changes for off-chain indexing.
• Testing: Achieve 100% branch test coverage using Foundry or Hardhat. Include fuzz testing and invariant testing.

4. OPTIMIZE (Performance & Review)

• Security Auditing: Run static analyzers (Slither, Aderyn) to catch common vulnerabilities (reentrancy, arithmetic overflows).
• Gas Optimization: Use calldata instead of memory for read-only external inputs. Pack structs to fit in 256-bit slots.
• Upgradability: If using proxies, ensure storage slots do not clash on upgrades (append-only storage).
• Documentation: Add NatSpec comments (@title, @notice, @param) to all public/external functions.