ERC-722

This Solidity contract is a lightweight, self-contained implementation of an ERC-721-like NFT standard designed for AI-generated art with evolving metadata. Unlike typical NFT contracts, it avoids import statements and constructors, making it compact and deployment-friendly. Instead of a constructor, it uses an initialize() function, which must be called once after deployment by the contract deployer. This sets the caller as the contract’s owner (admin), ensuring secure ownership control.

The contract supports the essential ERC-721 features such as balanceOf, ownerOf, transferFrom, approve, and setApprovalForAll, along with the standard events Transfer, Approval, and ApprovalForAll. This ensures NFT ownership tracking, transfers, and approvals work as expected while remaining minimal.

A key feature is dynamic metadata. Each token can have its own mutable tokenURI stored directly on-chain. If a specific URI isn’t set, the contract falls back to using a global baseURI concatenated with the token ID. This design allows NFTs to evolve over time, which is especially suited for AI-generated art that can be updated or refined.

Minting is restricted to the contract owner, while both the token owner and contract owner can update a token’s metadata. This makes it flexible yet secure.