Function Selector LookupCompute a 4-byte selector from a Solidity signature, or reverse-lookup a selector against a local database of common functions.Signature → SelectorSelector → SignatureClearSignature to SelectorFunction signatureAccepts canonical form, Solidity declarations (with parameter names and modifiers), or the full function ... line.Local database (63 signatures)Covers ERC-20, ERC-721, ERC-1155, Uniswap V2, Proxy / EIP-1967, and OpenZeppelin Ownable / AccessControl.