⏩URI Extension Protocol

Upgradable Metadata.

The URI Extension Protocol extends a standard ERC721, to allow an NFT to extend it's URI metadata (tokenURI function) into another contract for the purpose of upgrading it's token URI return methodology at a later time.

URI Extension Interface

Function	Role	Description
setExtTokenURI(contract)	NFT Contract Admin (write)	Set a URI Extension on the NFT with extension's contract address. Set back to address zero to return original NFT tokenURI.
tokenURI(tokenId)	NFT Contract (read-only)	Implements ERC721 Standard tokenURI function for given tokenId. If URI Extension is set, the NFT tokenURI will be returned from the URI Extension contract. setExtTokenURI
tokenURI(tokenId)	URI Extension Contract (read-only)	Implements ERC721 Standard tokenURI function for given tokenId.