⚠️ This EIP is not recommended for general use or implementation as it is likely to change.

EIP-5507: Refundable NFTs Source

Adds refund functionality to EIP-721 and EIP-1155 NFTs

Authorelie222, Pandapip1
Discussions-Tohttps://ethereum-magicians.org/t/eip-5507-refundable-nfts/10451
StatusDraft
TypeStandards Track
CategoryERC
Created2022-08-19
Requires 165, 721, 1155

Table of Contents

Abstract

This EIP adds refund functionality for initial NFT offerings to EIP-721 and EIP-1155. Funds are held in escrow until a predetermined time before they are claimable. Until that predetermined time passes, users can receive a refund for NFTs they have purchased.

Motivation

The NFT space lacks accountability. For the health of the NFT ecosystem as a whole, better mechanisms to prevent rugpulls from happening are needed. Offering refunds provides greater protection for buyers and increases legitimacy for creators.

Specification

The key words “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.

EIP-721 Refund Extension 

// SPDX-License-Identifier: CC0-1.0

pragma solidity ^0.8.4;

import "IERC721.sol";
import "IERC165.sol";

/// @notice Refundable EIP-721 tokens
/// @dev    The EIP-165 identifier of this interface is `0xTODO`
interface IERC721Refund is ERC721, ERC165 {
    /// @notice           Emitted when a token is refunded
    /// @dev              Emitted by `refund`
    /// @param  _sender   The person that requested a refund
    /// @param  _tokenId  The `tokenId` that was refunded
    event Refund(
        address indexed _sender,
        uint256 indexed _tokenId
    );

    /// @notice         As long as the refund is active for the given `tokenId`, refunds the user
    /// @dev            Make sure to check that the user has the token, and be aware of potential re-entrancy vectors
    /// @param  tokenId The `tokenId` to refund
    function refund(uint256 calldata tokenId) external;

    /// @notice         Gets the refund price of the specific `tokenId`
    /// @param  tokenId The `tokenId` to query
    /// @return wei     The amount of ether (in wei) that would be refunded
    function refundOf(uint256 tokenId) external view returns (uint256 wei);
 
    /// @notice         Gets the first block for which the refund is not active for a given `tokenId`
    /// @param  tokenId The `tokenId` to query
    /// @return block   The block beyond which the token cannot be refunded
    function refundDeadlineOf(uint256 tokenId) external view returns (uint256 block);
}

EIP-1155 Refund Extension 

// SPDX-License-Identifier: CC0-1.0

pragma solidity ^0.8.4;

import "IERC1155.sol";
import "IERC165.sol";

/// @notice Refundable EIP-1155 tokens
/// @dev    The EIP-165 identifier of this interface is `0xTODO`
interface IERC1155Refund is IERC1155, IERC165 {
    /// @notice           Emitted when a token is refunded
    /// @dev              Emitted by `refund`
    /// @param  _sender   The person that requested a refund
    /// @param  _tokenId  The `tokenId` that was refunded
    /// @param  _amount   The amount of `tokenId` that was refunded
    event Refund(
        address indexed _sender,
        uint256 indexed _tokenId,
        uint256 _amount
    );

    /// @notice         As long as the refund is active for the given `tokenId`, refunds the user
    /// @dev            Make sure to check that the user has enough tokens, and be aware of potential re-entrancy vectors
    /// @param  tokenId The `tokenId` to refund
    /// @param  amount  The amount of `tokenId` to refund
    function refund(uint256 calldata tokenId, uint256 amount) external;

    /// @notice         Gets the refund price of the specific `tokenId`
    /// @param  tokenId The `tokenId` to query
    /// @return wei     The amount of ether (in wei) that would be refunded
    function refundOf(uint256 tokenId) external view returns (uint256 wei);

    /// @notice         Gets the first block for which the refund is not active for a given `tokenId`
    /// @param  tokenId The `tokenId` to query
    /// @return block   The block beyond which the token cannot be refunded
    function refundDeadlineOf(uint256 tokenId) external view returns (uint256 block);
}

Rationale

TODO

Backwards Compatibility

No backward compatibility issues were found.

Security Considerations

Needs discussion.

Copyright and related rights waived via CC0.

Citation

Please cite this document as:

elie222, Pandapip1, "EIP-5507: Refundable NFTs [DRAFT]," Ethereum Improvement Proposals, no. 5507, August 2022. [Online serial]. Available: https://eips.ethereum.org/EIPS/eip-5507.