ERC-7646: Metadata Management for NFTsw

ERC-7646 proposes a standard for managing NFT metadata, letting a token's owner and authorized addresses update its metadata after minting. The author, identified in the article as Kureev, says updatable metadata would support use cases such as provenance tracking and game assets, and dynamic NFTs tied to IP, real estate, or supply chains. The proposed MetadataManager contract stores metadata per token, lets owners authorize or revoke other addresses, and can be used with any ERC721 or ERC1155 contract. The article lists its test cases as TBD and notes that the contract relies on the NFT contract's ownerOf function, which could create security issues if implemented incorrectly.