ERC-6551: NFT ↔ account binding stored in a registry contract; NFT metadata unchanged.
NFAT: NFT metadata directly names the wallet address; validator enforces “current NFT holder == wallet signer”; wallet is tradable anywhere ERC-721 is supported.
The philosophy is to make the wallet address part of the NFT’s identity; use a minimal validator so the NFT is the key. Instead of relying on a central registry coordinates the mapping and NFT point to an account;