ERC-721 Multi-Metadata Extension

The five-minute read

One action, walked through

1. Open ERC 7160 and read the status line before the examples.
2. Write down the rule in one sentence. A fair version of that sentence is: An extension to the ERC-721 standard to support multiple metadata URIs per token.
3. Name the object that changes: URI, MUST, NOT.
4. Ask what an old client, an old contract, or an offline counterparty does. If the document is silent, the silence is part of the design.

The argument, unpacked

What has to be true

• You are implementing ERC 7160 at the status the text itself states: Final.
• The object that has to change is URI, MUST, NOT. A neighbouring document with a similar name is not this one.
• Wallet support is not the same as consensus validity.

What happened after the paper

The source marks this final. That is a statement about the text, not a promise that every wallet or node has shipped it. Later documents can narrow, replace, or ignore this one. Cite the number you mean.

What to check before you use the idea

• What is covered by the signed bytes in ERC-721 Multi-Metadata Extension?
• Can the same signature be replayed on another chain, account, or message?
• Which primitive does the text require: URI, MUST, NOT?

Terms

ERC 7160

The public text titled ERC-721 Multi-Metadata Extension.

Final

The document's own label for how finished the text is. It is not a market fact.

The problem the paper names

A signature that does not commit to what the user saw can be replayed into a different spend, a different chain, or a different message.

What the design proposes

• An extension to the ERC-721 standard to support multiple metadata URIs per token.
• It introduces a new interface, IERC721MultiMetadata, which provides methods for accessing the metadata URIs associated with a token, including a pinned URI index and a list of all metadata URIs.
• The extension is designed to be backward compatible with existing ERC721Metadata implementations.

How the mechanism is specified

• Taken from the specification, the next constraint is: It introduces a new interface, IERC721MultiMetadata, which provides methods for accessing the metadata URIs associated with a token, including a pinned URI index and a list of all metadata URIs.
• Locate URI, MUST, NOT in ERC 7160 and apply it to one transaction or call.
• Then check the failure the class of rule always has: a node that did not upgrade, a reverted call, a replayed signature, or a peer that does not speak the message.

What this page does not treat as proven

• A signature scheme is not a privacy system. It hides the signer only if the protocol says so.
• Wallet support is not the same as consensus validity.
• The source marks this final. That is a statement about the text, not a promise that every wallet or node has shipped it.

Why a venture studio still reads it

Use ERC 7160 when a pitch says 'ERC-721 Multi-Metadata Extension' without saying whether the rule is consensus, policy, or an interface. The number is the citation. The pitch is not.