ERC-5008: ERC-721 Nonce Extension

Add a `nonce` function to ERC-721.

Metadata

Status: Last CallStandards Track: ERCCreated: 2022-04-10

Authors

Anders (@0xanders), Lance (@LanceSnow), Shrug (shrug@emojidao.org)

Requires

EIP-165, EIP-721

Links

GitHub page Discussion on Ethereum Magicians

Abstract

This standard is an extension of ERC-721. It proposes adding a nonce function to ERC-721 tokens.

Motivation

Some orders of NFT marketplaces have been attacked and the NFTs sold at a lower price than the current market floor price. This can happen when users transfer an NFT to another wallet and, later, back to the original wallet. This reactivates the order, which may list the token at a much lower price than the owner would have intended.

This EIP proposes adding a nonce property to ERC-721 tokens, and the nonce will be changed when a token is transferred. If a nonce is added to an order, the order can be checked to avoid attacks.

Specification

The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY" and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

The nonce(uint256 tokenId) function MUST be implemented as view.

The supportsInterface method MUST return true when called with 0xce03fdab.

Rationale

At first transferCount was considered as function name, but there may some case to change the nonce besides transfer, such as important properties changed, then we changed transferCount to nonce.

Backwards Compatibility

This standard is compatible with ERC-721.

Test Cases

Test cases are included in test.js.

Run:

Reference Implementation

See ERC5008.sol.

Security Considerations

No security issues found.