ERC-6551 (Token-Bound Accounts)

An Ethereum standard that assigns a smart contract account (wallet) to every ERC-721 NFT, enabling NFTs to own other tokens, NFTs, and interact with protocols directly. Token-bound accounts (TBAs) are created through a permissionless registry using CREATE2 for deterministic addresses. Use cases include gaming inventories, bundled DeFi positions tradable as single NFTs, and identity-linked portfolios.