From 46863bd5aea45736e3acce7d61a4c92408df9f2b Mon Sep 17 00:00:00 2001 From: 0xdagarn Date: Tue, 2 Sep 2025 11:11:07 +0900 Subject: [PATCH 1/5] Add ERC: Delegatable Utility Tokens for ERC-721 NFTs --- ERCS/erc-6884.md | 262 ++ assets/erc-6884/.gitignore | 3 + assets/erc-6884/contracts/ERC6884.sol | 130 + assets/erc-6884/contracts/IERC6884.sol | 116 + assets/erc-6884/contracts/mock/MockERC721.sol | 12 + assets/erc-6884/hardhat.config.ts | 17 + assets/erc-6884/package.json | 26 + assets/erc-6884/test/test.js | 212 ++ assets/erc-6884/yarn.lock | 2851 +++++++++++++++++ 9 files changed, 3629 insertions(+) create mode 100644 ERCS/erc-6884.md create mode 100644 assets/erc-6884/.gitignore create mode 100644 assets/erc-6884/contracts/ERC6884.sol create mode 100644 assets/erc-6884/contracts/IERC6884.sol create mode 100644 assets/erc-6884/contracts/mock/MockERC721.sol create mode 100644 assets/erc-6884/hardhat.config.ts create mode 100644 assets/erc-6884/package.json create mode 100644 assets/erc-6884/test/test.js create mode 100644 assets/erc-6884/yarn.lock diff --git a/ERCS/erc-6884.md b/ERCS/erc-6884.md new file mode 100644 index 00000000000..2cbc68b87cc --- /dev/null +++ b/ERCS/erc-6884.md @@ -0,0 +1,262 @@ +--- +eip: 6884 +title: Delegatable Utility Tokens for ERC-721 NFTs +description: Standard interface for delegation of utility usage rights bound to ERC-721 origin tokens. +author: Geonwoo Shin (@blgamann), Jongbeom Won (@enginism) +discussions-to: https://ethereum-magicians.org/t/eip-6884-delegatable-utility-tokens-derived-from-origin-nfts +status: Draft +type: Standards Track +category: ERC +created: 2023-04-10 +requires: 165, 712 +--- + +## Abstract + +This ERC specifies Delegatable Utility Tokens (DUT), which allow utility rights to be associated with ERC-721 origin tokens. Ownership of each utility remains tied to the origin token owner, while usage rights can be delegated to other addresses without transferring ownership. + +## Motivation + +Most ERC-721 NFTs provide limited or underutilized utility. These limitations become more apparent as NFTs accumulate multiple utilities and can be categorized as follows: + +1. **Supply-side limitation**: Utilities are typically provided only by the project team or a small subset of holders, restricting broader ecosystem participation. +2. **Demand-side limitation**: A single owner cannot fully utilize all available utilities, leaving potential value unrealized. +3. **Time limitation**: Even if many utilities are attached to an NFT, one holder has limited time and therefore cannot make use of them all. + +ERC-6884 addresses these limitations by defining Delegatable Utility Tokens (DUT). A DUT binds utility rights to an ERC-721 origin token while allowing usage rights to be delegated independently from ownership. DUTs remain tied to the current owner of the origin token, and when ownership of the origin token changes, all associated DUTs automatically transfer to the new owner without additional transactions. + +## 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. + +Every ERC-6884 compliant contract must implement the `IERC6884` and `IERC165` interfaces: + +```solidity +pragma solidity ^0.8.0; + +interface IERC6884 /* is IERC165 */ { + /// Event emitted when the approved address for a token usage right is + /// changed or reaffirmed. The zero address indicates that there is no + /// approved address. When a Transfer event is emitted, this also + /// signifies that the approved address for that token usage right + /// (if any) is reset to none. + event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); + + /// Event emitted when an operator is enabled or disabled. The operator + /// has the authority to delegate or restore the token usage rights. + event ApprovalForAll(address indexed owner, address indexed operator, bool approved); + + /// Event emitted when the owner delegates a token usage right to a user + /// for a specific period of time. At the end of the delegation period, + /// the owner can regain the token usage right, or the user can restore + /// it to the owner before the delegation period ends. + event Delegated(address indexed owner, address indexed user, uint256 indexed tokenId, uint256 duration); + + /// Event emitted when the owner regains a token usage right that was + /// delegated to a user. + event Regained(uint256 indexed tokenId); + + /// Event emitted when the user restores a token usage right that was + /// delegated. + event Restored(uint256 indexed tokenId); + + /// @notice Returns the address of the ERC-721 contract that this contract + /// is based on. + /// @return The address of the ERC-721 contract. + function origin() external view returns (address); + + /// @notice Returns the expiration date of a token usage right. + /// @dev The token id matches the id of the origin token. + /// @param tokenId The identifier for a token usage right. + /// @return The expiration date of the token usage right. + function expiration(uint256 tokenId) external view returns (uint256); + + /// @notice Returns the number of token usage rights owned by `owner`. + /// @dev Returns the balance of the origin token. Whether the token usage + /// right is delegated or not does not affect the balance at all. + /// @param owner The address of the owner. + /// @return The number of token usage rights that can be delegated, owned + /// by `owner`. + function balanceOf(address owner) external view returns (uint256); + + /// @notice Returns the address of the owner of the token usage right. + /// @dev Always the same as the owner of the origin token. + /// @param tokenId The identifier for a token usage right. + /// @return The address of the owner of the token usage right. + function ownerOf(uint256 tokenId) external view returns (address); + + /// @notice Returns the address of the user of the token usage right. + /// @dev The usage rights are non-transferable and can only be delegated. + /// @param tokenId The identifier for a token usage right. + /// @return The address of the user of the token usage right. + function userOf(uint256 tokenId) external view returns (address); + + /// @notice Returns the address of the approved user for this token + /// usage right. + /// @param tokenId The identifier for a token usage right. + /// @return The address of the approved user for this token usage right. + function getApproved(uint256 tokenId) external view returns (address); + + /// @notice Returns true if the operator is approved by the owner. + /// @param owner The address of the owner. + /// @param operator The address of the operator. + /// @return True if the operator is approved by the owner. + function isApprovedForAll(address owner, address operator) external view returns (bool); + + /// @notice Approves another address to use the token usage right + /// on behalf of the caller. + /// @param spender The address to be approved. + /// @param tokenId The identifier for a token usage right. + function approve(address spender, uint256 tokenId) external; + + /// @notice Approves or disapproves the operator. + /// @param operator The address of the operator. + /// @param approved True if the operator is approved, false to revoke + /// approval. + function setApprovalForAll(address operator, bool approved) external; + + /// @notice Delegates a token usage right from owner to new user. + /// @dev Only the owner of the token usage right can delegate it. + /// @param user The address of the new user. + /// @param tokenId The identifier for a token usage right. + /// @param duration The duration of the delegation in seconds. + function delegate(address user, uint256 tokenId, uint256 duration) external; + + /// @notice Regains a token usage right from user to owner. + /// @dev The token usage right can only be regained if the delegation + /// period has ended. + /// @param tokenId The identifier for a token usage right. + function regain(uint256 tokenId) external; + + /// @notice Restores a token usage right from user to owner. + /// @dev User can restore the token usage right before the delegation + /// period ends. + /// @param tokenId The identifier for a token usage right. + function restore(uint256 tokenId) external; +} + +interface IERC165 { + /// @notice Query if a contract implements an interface + /// @param interfaceID The interface identifier, as specified in ERC-165 + /// @dev Interface identification is specified in ERC-165. This function + /// uses less than 30,000 gas. + /// @return `true` if the contract implements `interfaceID` and + /// `interfaceID` is not 0xffffffff, `false` otherwise + function supportsInterface(bytes4 interfaceID) external view returns (bool); +} +``` + +### Metadata + +The metadata extension is OPTIONAL for ERC-6884 smart contracts. This allows your smart contract to be interrogated for its name and for details about the assets which your utility represent. + +```solidity +interface IERC6884Metadata /* is IERC6884 */ { + /// @notice A descriptive name for a collection of Tokens in this contract + function name() external view returns (string memory _name); + + /// @notice An abbreviated name for Tokens in this contract + function symbol() external view returns (string memory _symbol); + + /// @notice A distinct Uniform Resource Identifier (URI) for a given asset. + /// @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC + /// 3986. The URI may point to a JSON file that conforms to the "ERC-721 + /// Metadata JSON Schema". + function tokenURI(uint256 _tokenId) external view returns (string memory); +} +``` + +The EIP-6884 Metadata JSON schema follows the same specifications as the metadata schema used in ERC-721. + +```json +{ + "title": "Asset Metadata", + "type": "object", + "properties": { + "name": { + "type": "string", + "description": "Identifies the asset to which this Token represents" + }, + "description": { + "type": "string", + "description": "Describes the asset to which this Token represents" + }, + "image": { + "type": "string", + "description": "A URI pointing to a resource with mime type image/* representing the asset to which this NFT represents. Consider making any images at a width between 320 and 1080 pixels and aspect ratio between 1.91:1 and 4:5 inclusive." + } + } +} +``` + +## Rationale + +This ERC is designed to enhance NFT utility while preserving the integrity of the origin asset. + +NFTs are valuable assets, and requiring them to be transferred or locked into additional contracts introduces risk. By separating usage rights from ownership, this standard enables utility expansion without moving the origin NFT. + +### Why Delegatable but not Transferable + +Utility rights are **delegable** but not **transferable**. Allowing utilities to be freely transferred or sold would dilute the value of the origin NFT, since its worth is defined by the sum of its associated utilities. By limiting utilities to temporary delegation, this standard ensures that: + +- The aggregate value of an NFT remains tied to its ownership. +- Multiple users can benefit from utilities without fragmenting or redistributing ownership. +- Utility can be shared over time while ownership remains intact. + +### Relationship to ERC-721 + +This standard does not extend ERC-721. ERC-721 defines transferable ownership semantics, while Delegatable Utility Tokens are explicitly non-transferable and only delegable. Rather than inheriting ERC-721 and reverting transfer functions, a separate standard provides a clearer and simpler design. + +### Owners and Users + +Two roles are distinguished: + +- **Owner**: the holder of the origin ERC-721 token, and therefore the holder of the corresponding DUT. +- **User**: the account delegated to exercise the usage right. + +`ownerOf(tokenId)` always returns the current owner of the origin token. +`userOf(tokenId)` returns the delegated user if an active delegation exists; otherwise it returns the owner. + +### Balance + +`balanceOf(owner)` reflects the balance of the origin ERC-721 contract. Delegation state does not affect balances. This preserves compatibility with other ERC standards and makes explicit that ownership of DUTs is derived directly from ownership of the origin NFTs. + +### No Minting Process + +DUTs are not minted. Their existence is implicit in the existence of the origin NFT. Ownership is automatically derived from the origin contract, and delegation state is tracked separately. As a result, no additional minting or burning operations are required, and DUT ownership automatically follows transfers of the origin NFT without additional transactions or gas costs. + +### Delegation Lifecycle + +Delegation is managed through three functions: + +- `delegate`: assigns usage rights to a user for a defined duration. +- `regain`: allows the owner to recover usage rights after expiration. +- `restore`: allows the user to return usage rights to the owner before expiration. + +### Approval + +An approval system, modeled on ERC-721, enables delegation to be mediated by approved operators. This allows external applications to build markets and coordination mechanisms for usage rights without altering the underlying ownership of the NFT. + +## Test Cases + +Test cases are included in `test.js`. + +To run: + +```bash +cd assets/erc-6884 +yarn install +yarn hardhat test test/test.js +``` + +## Reference Implementation + +See [ERC6884.sol](../assets/erc-6884/contracts/ERC6884.sol). + +## Security Considerations + +Delegation state may persist across NFT transfers. For example, a seller could delegate usage rights just before selling, leaving the buyer with impaired utility until expiration. Implementations SHOULD enforce proper expiration checks, restrict approvals to the owner or approved operators, and disallow sub-delegation. Marketplaces and wallets SHOULD surface delegation state (`userOf`, `expiration`) to ensure transparency during trades. + +## Copyright + +Copyright and related rights waived via CC0. diff --git a/assets/erc-6884/.gitignore b/assets/erc-6884/.gitignore new file mode 100644 index 00000000000..adb7fa33ce6 --- /dev/null +++ b/assets/erc-6884/.gitignore @@ -0,0 +1,3 @@ +artifacts +cache +node_modules \ No newline at end of file diff --git a/assets/erc-6884/contracts/ERC6884.sol b/assets/erc-6884/contracts/ERC6884.sol new file mode 100644 index 00000000000..2b5d866858c --- /dev/null +++ b/assets/erc-6884/contracts/ERC6884.sol @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: CC0-1.0 +pragma solidity ^0.8.0; + +import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; + +contract ERC6884 { + event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); + event ApprovalForAll(address indexed owner, address indexed operator, bool approved); + + event Delegated(address indexed from, address indexed to, uint256 indexed tokenId, uint256 duration); + event Regained(uint256 indexed tokenId); + event Restored(uint256 indexed tokenId); + + mapping(uint256 => address) private _users; + + mapping(uint256 => address) private _tokenApprovals; + mapping(address => mapping(address => bool)) private _operatorApprovals; + + address private _origin; + mapping(uint256 => uint256) private _expirations; + + function origin() public view returns (address) { + return _origin; + } + + function expiration(uint256 tokenId) public view returns (uint256) { + return _expirations[tokenId]; + } + + function balanceOf(address owner) public view virtual returns (uint256) { + return IERC721(_origin).balanceOf(owner); + } + + function ownerOf(uint256 tokenId) public view virtual returns (address) { + return IERC721(_origin).ownerOf(tokenId); + } + + function userOf(uint256 tokenId) public view virtual returns (address) { + return _expirations[tokenId] == 0 ? ownerOf(tokenId) : _users[tokenId]; + } + + constructor(address origin_) { + require( + IERC721(origin_).supportsInterface(type(IERC721).interfaceId), + "ERC6884: INVALID_ERC721" + ); + _origin = origin_; + } + + function approve(address spender, uint256 tokenId) public virtual { + address user = userOf(tokenId); + require( + msg.sender == user || _operatorApprovals[user][msg.sender], + "ERC6884: NOT_AUTHORIZED" + ); + + _tokenApprovals[tokenId] = spender; + emit Approval(user, spender, tokenId); + } + + function setApprovalForAll(address operator, bool approved) public virtual { + _operatorApprovals[msg.sender][operator] = approved; + + emit ApprovalForAll(msg.sender, operator, approved); + } + + function getApproved(uint256 tokenId) public view virtual returns (address) { + return _tokenApprovals[tokenId]; + } + + function isApprovedForAll(address owner, address operator) public view virtual returns (bool) { + return _operatorApprovals[owner][operator]; + } + + function delegate(address to, uint256 tokenId, uint256 duration) public virtual { + address owner = ownerOf(tokenId); + require( + msg.sender == owner || + _operatorApprovals[owner][msg.sender] || + _tokenApprovals[tokenId] == msg.sender, + "ERC6884: NOT_AUTHORIZED" + ); + + _transfer(owner, to, tokenId); + + uint256 expiration_ = block.timestamp + duration; + _expirations[tokenId] = expiration_; + emit Delegated(owner, to, tokenId, duration); + } + + function regain(uint256 tokenId) public virtual { + require(_expirations[tokenId] != 0, "ERC6884: NOT_REGAINABLE"); + require(_expirations[tokenId] < block.timestamp, "ERC6884: NOT_EXPIRED"); + + address user = userOf(tokenId); + address owner = ownerOf(tokenId); + _transfer(user, owner, tokenId); + + delete _expirations[tokenId]; + emit Regained(tokenId); + } + + function restore(uint256 tokenId) public virtual { + address user = userOf(tokenId); + require( + msg.sender == user || + _operatorApprovals[user][msg.sender] || + _tokenApprovals[tokenId] == msg.sender, + "ERC6884: NOT_AUTHORIZED" + ); + + address owner = ownerOf(tokenId); + _transfer(user, owner, tokenId); + + delete _expirations[tokenId]; + emit Restored(tokenId); + } + + function _transfer( + address from, + address to, + uint256 tokenId + ) internal virtual { + require(userOf(tokenId) == from, "ERC6884: INVALID_SENDER"); + require(to != address(0), "ERC6884: ZERO_ADDRESS"); + + delete _tokenApprovals[tokenId]; + _users[tokenId] = to; + } +} \ No newline at end of file diff --git a/assets/erc-6884/contracts/IERC6884.sol b/assets/erc-6884/contracts/IERC6884.sol new file mode 100644 index 00000000000..25bea69ba88 --- /dev/null +++ b/assets/erc-6884/contracts/IERC6884.sol @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: CC0-1.0 +pragma solidity ^0.8.0; + +interface IERC6884 /* is IERC165 */ { + /// Event emitted when a token usage right has been changed. + event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); + + /// Event emitted when the approved address for a token usage right is + /// changed or reaffirmed. The zero address indicates that there is no + /// approved address. When a Transfer event is emitted, this also + /// signifies that the approved address for that token usage right + /// (if any) is reset to none. + event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); + + /// Event emitted when an operator is enabled or disabled. The operator + /// has the authority to delegate or restore the token usage rights. + event ApprovalForAll(address indexed owner, address indexed operator, bool approved); + + /// Event emitted when the owner delegates a token usage right to a user + /// for a specific period of time. At the end of the delegation period, + /// the owner can regain the token usage right, or the user can restore + /// it to the owner before the delegation period ends. + event Delegated(address indexed owner, address indexed user, uint256 indexed tokenId, uint256 duration); + + /// Event emitted when the owner regains a token usage right that was + /// delegated to a user. + event Regained(uint256 indexed tokenId); + + /// Event emitted when the user restores a token usage right that was + /// delegated. + event Restored(uint256 indexed tokenId); + + /// @notice Returns the address of the ERC721 contract + /// that this contract is based on. + /// @return The address of the ERC721 contract. + function origin() external view returns (address); + + /// @notice Returns the expiration date of a token usage right. + /// @dev The token id matches the id of the origin token. + /// @param tokenId The identifier for a token usage right. + /// @return The expiration date of the token usage right. + function expiration(uint256 tokenId) external view returns (uint256); + + /// @notice Returns the number of token usage rights owned by `owner`. + /// @dev Returns the balance of the origin token. Whether the token usage + /// right is delegated or not does not affect the balance at all. + /// @param owner The address of the owner. + /// @return The number of token usage rights that can be delegated, owned + /// by `owner`. + function balanceOf(address owner) external view returns (uint256); + + /// @notice Returns the address of the owner of the token usage right. + /// @dev Always the same as the owner of the origin token. + /// @param tokenId The identifier for a token usage right. + /// @return The address of the owner of the token usage right. + function ownerOf(uint256 tokenId) external view returns (address); + + /// @notice Returns the address of the user of the token usage right. + /// @dev The usage rights are non-transferable and can only be delegated. + /// @param tokenId The identifier for a token usage right. + /// @return The address of the user of the token usage right. + function userOf(uint256 tokenId) external view returns (address); + + /// @notice Returns the address of the approved user for this token + /// usage right. + /// @param tokenId The identifier for a token usage right. + /// @return The address of the approved user for this token usage right. + function getApproved(uint256 tokenId) external view returns (address); + + /// @notice Returns true if the operator is approved by the owner. + /// @param owner The address of the owner. + /// @param operator The address of the operator. + /// @return True if the operator is approved by the owner. + function isApprovedForAll(address owner, address operator) external view returns (bool); + + /// @notice Approves another address to use the token usage right + /// on behalf of the caller. + /// @param spender The address to be approved. + /// @param tokenId The identifier for a token usage right. + function approve(address spender, uint256 tokenId) external; + + /// @notice Approves or disapproves the operator. + /// @param operator The address of the operator. + /// @param approved True if the operator is approved, false to revoke + /// approval. + function setApprovalForAll(address operator, bool approved) external; + + /// @notice Delegates a token usage right from owner to new user. + /// @dev Only the owner of the token usage right can delegate it. + /// @param user The address of the new user. + /// @param tokenId The identifier for a token usage right. + /// @param duration The duration of the delegation in seconds. + function delegate(address user, uint256 tokenId, uint256 duration) external; + + /// @notice Regains a token usage right from user to owner. + /// @dev The token usage right can only be regained if the delegation + /// period has ended. + /// @param tokenId The identifier for a token usage right. + function regain(uint256 tokenId) external; + + /// @notice Restores a token usage right from user to owner. + /// @dev User can restore the token usage right before the delegation + /// period ends. + /// @param tokenId The identifier for a token usage right. + function restore(uint256 tokenId) external; +} + +interface ERC165 { + /// @notice Query if a contract implements an interface + /// @param interfaceID The interface identifier, as specified in ERC-165 + /// @dev Interface identification is specified in ERC-165. This function + /// uses less than 30,000 gas. + /// @return `true` if the contract implements `interfaceID` and + /// `interfaceID` is not 0xffffffff, `false` otherwise + function supportsInterface(bytes4 interfaceID) external view returns (bool); +} \ No newline at end of file diff --git a/assets/erc-6884/contracts/mock/MockERC721.sol b/assets/erc-6884/contracts/mock/MockERC721.sol new file mode 100644 index 00000000000..67037781e00 --- /dev/null +++ b/assets/erc-6884/contracts/mock/MockERC721.sol @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: CC0-1.0 +pragma solidity ^0.8.0; + +import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; + +contract MockERC721 is ERC721 { + constructor() ERC721("Mock", "MOCK") {} + + function mint(address to, uint256 tokenId) public { + _mint(to, tokenId); + } +} \ No newline at end of file diff --git a/assets/erc-6884/hardhat.config.ts b/assets/erc-6884/hardhat.config.ts new file mode 100644 index 00000000000..f1b6fdec458 --- /dev/null +++ b/assets/erc-6884/hardhat.config.ts @@ -0,0 +1,17 @@ +import { HardhatUserConfig } from "hardhat/config"; +import "@nomicfoundation/hardhat-chai-matchers"; +import "@typechain/hardhat"; + +const config: HardhatUserConfig = { + solidity: { + version: "0.8.16", + settings: { + optimizer: { + enabled: true, + runs: 200, + }, + }, + }, +}; + +export default config; diff --git a/assets/erc-6884/package.json b/assets/erc-6884/package.json new file mode 100644 index 00000000000..a6ccde6a026 --- /dev/null +++ b/assets/erc-6884/package.json @@ -0,0 +1,26 @@ +{ + "name": "delegatable-utility-tokens", + "scripts": { + "test": "hardhat test" + }, + "engines": { + "node": ">=16.0.0" + }, + "dependencies": { + "@openzeppelin/contracts": "^4.6.0" + }, + "devDependencies": { + "@nomicfoundation/hardhat-chai-matchers": "^1.0.1", + "@nomicfoundation/hardhat-network-helpers": "^1.0.3", + "@nomiclabs/hardhat-ethers": "^2.2.1", + "@typechain/ethers-v5": "^10.1.0", + "@typechain/hardhat": "^6.1.2", + "@types/chai": "^4.3.1", + "chai": "^4.3.6", + "ethers": "^5.6.9", + "hardhat": "^2.12.2", + "ts-node": "^10.8.2", + "typechain": "^8.1.0", + "typescript": "^4.7.4" + } +} diff --git a/assets/erc-6884/test/test.js b/assets/erc-6884/test/test.js new file mode 100644 index 00000000000..3dda182dc6f --- /dev/null +++ b/assets/erc-6884/test/test.js @@ -0,0 +1,212 @@ +const { expect } = require("chai"); +const { ethers } = require("hardhat"); +const { time } = require("@nomicfoundation/hardhat-network-helpers"); + +describe("ERC6884", () => { + let alice, bob, carl; + let erc721, erc6884; + + const tokenId = 1; + + const blockTimestamp = async () => await time.latest(); + + beforeEach(async () => { + [deployer, alice, bob, carl] = await ethers.getSigners(); + + const ERC721 = await ethers.getContractFactory("MockERC721"); + const ERC6884 = await ethers.getContractFactory("ERC6884"); + + erc721 = await ERC721.deploy(); + erc6884 = await ERC6884.deploy(erc721.address); + + await erc721.mint(alice.address, tokenId); + }); + + it("correctly constructs an ERC6884", async () => { + expect(await erc6884.origin()).to.equal(erc721.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.userOf(tokenId)).to.equal(alice.address); + }); + + describe("approve", () => { + it("sets token approval", async () => { + await erc6884.connect(alice).approve(bob.address, tokenId); + expect(await erc6884.getApproved(tokenId)).to.equal(bob.address); + }); + + it("sets token approval from operator", async () => { + await erc6884.connect(alice).setApprovalForAll(bob.address, true); + await erc6884.connect(bob).approve(carl.address, tokenId); + expect(await erc6884.getApproved(tokenId)).to.equal(carl.address); + }); + + it("reverts if the sender is an unauthorized account", async () => { + await expect( + erc6884.connect(bob).approve(carl.address, tokenId) + ).to.be.revertedWith("ERC6884: NOT_AUTHORIZED"); + }); + }); + + describe("setApprovalForAll", () => { + it("sets operator approval", async () => { + await erc6884.connect(alice).setApprovalForAll(bob.address, true); + expect(await erc6884.isApprovedForAll(alice.address, bob.address)).to.be + .true; + }); + }); + + describe("delegate", () => { + const duration = 86400; + + it("delegates token use right from the owner", async () => { + await erc6884.connect(alice).delegate(bob.address, tokenId, duration); + + // The use right is changed. + expect(await erc6884.userOf(tokenId)).to.equal(bob.address); + expect(await erc6884.expiration(tokenId)).to.equal( + (await blockTimestamp()) + duration + ); + + // But, the ownership is not changed. + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + }); + + it("delegates token use right from the operator", async () => { + await erc6884.connect(alice).setApprovalForAll(bob.address, true); + await erc6884.connect(bob).delegate(carl.address, tokenId, duration); + + // The use right is changed. + expect(await erc6884.userOf(tokenId)).to.equal(carl.address); + expect(await erc6884.expiration(tokenId)).to.equal( + (await blockTimestamp()) + duration + ); + + // But, the ownership is not changed. + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + }); + + it("delegates token use right from the approved account", async () => { + await erc6884.connect(alice).approve(bob.address, tokenId); + await erc6884.connect(bob).delegate(carl.address, tokenId, duration); + + // The use right is changed. + expect(await erc6884.userOf(tokenId)).to.equal(carl.address); + expect(await erc6884.expiration(tokenId)).to.equal( + (await blockTimestamp()) + duration + ); + + // But, the ownership is not changed. + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + }); + + it("reverts if the origin token does not exist", async () => { + const nonExistentTokenId = 2; + await expect( + erc6884 + .connect(alice) + .delegate(bob.address, nonExistentTokenId, duration) + ).to.be.reverted; + }); + + it("reverts if the sender is an unauthorized account", async () => { + await expect( + erc6884.connect(carl).delegate(bob.address, tokenId, duration) + ).to.be.revertedWith("ERC6884: NOT_AUTHORIZED"); + }); + }); + + describe("regain", () => { + const duration = 86400; + + const makeBlockTimeAfterExpiration = async (duration) => { + await time.increase(duration); + }; + + beforeEach(async () => { + await erc6884.connect(alice).delegate(bob.address, tokenId, duration); + }); + + it("regains token use right after expiration by any account", async () => { + await makeBlockTimeAfterExpiration(duration); + await erc6884.connect(carl).regain(tokenId); + + // The use right is changed. + expect(await erc6884.userOf(tokenId)).to.equal(alice.address); + expect(await erc6884.expiration(tokenId)).to.equal(0); + + // But, the ownership is not changed. + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + }); + + it("reverts if the token has already been regained", async () => { + await makeBlockTimeAfterExpiration(duration); + await erc6884.connect(carl).regain(tokenId); + await expect(erc6884.connect(carl).regain(tokenId)).to.be.revertedWith( + "ERC6884: NOT_REGAINABLE" + ); + }); + + it("reverts if the token is not expired", async () => { + await expect(erc6884.connect(carl).regain(tokenId)).to.be.revertedWith( + "ERC6884: NOT_EXPIRED" + ); + }); + }); + + describe("restore", () => { + const duration = 86400; + + beforeEach(async () => { + await erc6884.connect(alice).delegate(bob.address, tokenId, duration); + }); + + it("restores token use right by the user", async () => { + await erc6884.connect(bob).restore(tokenId); + + // The use right is changed. + expect(await erc6884.userOf(tokenId)).to.equal(alice.address); + expect(await erc6884.expiration(tokenId)).to.equal(0); + + // But, the ownership is not changed. + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + }); + + it("restores token use right by the operator", async () => { + await erc6884.connect(bob).setApprovalForAll(carl.address, true); + await erc6884.connect(carl).restore(tokenId); + + // The use right is changed. + expect(await erc6884.userOf(tokenId)).to.equal(alice.address); + expect(await erc6884.expiration(tokenId)).to.equal(0); + + // But, the ownership is not changed. + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + }); + + it("restores token use right by the approved account", async () => { + await erc6884.connect(bob).approve(carl.address, tokenId); + await erc6884.connect(carl).restore(tokenId); + + // The use right is changed. + expect(await erc6884.userOf(tokenId)).to.equal(alice.address); + expect(await erc6884.expiration(tokenId)).to.equal(0); + + // But, the ownership is not changed. + expect(await erc6884.ownerOf(tokenId)).to.equal(alice.address); + expect(await erc6884.balanceOf(alice.address)).to.equal(tokenId); + }); + + it("reverts if the sender is an unauthorized account", async () => { + await expect(erc6884.connect(carl).restore(tokenId)).to.be.revertedWith( + "ERC6884: NOT_AUTHORIZED" + ); + }); + }); +}); diff --git a/assets/erc-6884/yarn.lock b/assets/erc-6884/yarn.lock new file mode 100644 index 00000000000..47b10613736 --- /dev/null +++ b/assets/erc-6884/yarn.lock @@ -0,0 +1,2851 @@ +# THIS IS AN AUTOGENERATED FILE. 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fc44d13f25fb286f06f15c8e89f493cb19d3332c Mon Sep 17 00:00:00 2001 From: 0xdagarn Date: Tue, 2 Sep 2025 11:59:11 +0900 Subject: [PATCH 2/5] Update ERCS/erc-6884.md --- ERCS/erc-6884.md | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/ERCS/erc-6884.md b/ERCS/erc-6884.md index 2cbc68b87cc..a8b9861bc76 100644 --- a/ERCS/erc-6884.md +++ b/ERCS/erc-6884.md @@ -1,7 +1,7 @@ --- eip: 6884 title: Delegatable Utility Tokens for ERC-721 NFTs -description: Standard interface for delegation of utility usage rights bound to ERC-721 origin tokens. +description: Standard for delegating non-transferable utility rights derived from ERC-721 NFTs. author: Geonwoo Shin (@blgamann), Jongbeom Won (@enginism) discussions-to: https://ethereum-magicians.org/t/eip-6884-delegatable-utility-tokens-derived-from-origin-nfts status: Draft @@ -13,23 +13,23 @@ requires: 165, 712 ## Abstract -This ERC specifies Delegatable Utility Tokens (DUT), which allow utility rights to be associated with ERC-721 origin tokens. Ownership of each utility remains tied to the origin token owner, while usage rights can be delegated to other addresses without transferring ownership. +This ERC specifies Delegatable Utility Tokens (DUT), which allow utility rights to be associated with [ERC-721](./erc-721.md) origin tokens. Ownership of each utility remains tied to the origin token owner, while usage rights can be delegated to other addresses without transferring ownership. ## Motivation -Most ERC-721 NFTs provide limited or underutilized utility. These limitations become more apparent as NFTs accumulate multiple utilities and can be categorized as follows: +Most [ERC-721](./erc-721.md) NFTs provide limited or underutilized utility. These limitations become more apparent as NFTs accumulate multiple utilities and can be categorized as follows: 1. **Supply-side limitation**: Utilities are typically provided only by the project team or a small subset of holders, restricting broader ecosystem participation. 2. **Demand-side limitation**: A single owner cannot fully utilize all available utilities, leaving potential value unrealized. 3. **Time limitation**: Even if many utilities are attached to an NFT, one holder has limited time and therefore cannot make use of them all. -ERC-6884 addresses these limitations by defining Delegatable Utility Tokens (DUT). A DUT binds utility rights to an ERC-721 origin token while allowing usage rights to be delegated independently from ownership. DUTs remain tied to the current owner of the origin token, and when ownership of the origin token changes, all associated DUTs automatically transfer to the new owner without additional transactions. +This standard addresses these limitations by defining Delegatable Utility Tokens (DUT). A DUT binds utility rights to an [ERC-721](./erc-721.md) origin token while allowing usage rights to be delegated independently from ownership. DUTs remain tied to the current owner of the origin token, and when ownership of the origin token changes, all associated DUTs automatically transfer to the new owner without additional transactions. ## 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. -Every ERC-6884 compliant contract must implement the `IERC6884` and `IERC165` interfaces: +Every contract compliant with this standard contract must implement the `IERC6884` and `IERC165` interfaces: ```solidity pragma solidity ^0.8.0; @@ -148,7 +148,7 @@ interface IERC165 { ### Metadata -The metadata extension is OPTIONAL for ERC-6884 smart contracts. This allows your smart contract to be interrogated for its name and for details about the assets which your utility represent. +The metadata extension is OPTIONAL for contracts implementing this standard. This allows your smart contract to be interrogated for its name and for details about the assets which your utility represent. ```solidity interface IERC6884Metadata /* is IERC6884 */ { @@ -166,7 +166,7 @@ interface IERC6884Metadata /* is IERC6884 */ { } ``` -The EIP-6884 Metadata JSON schema follows the same specifications as the metadata schema used in ERC-721. +The metadata JSON schema follows the same specifications as the metadata schema used in [ERC-721](./erc-721.md). ```json { @@ -203,15 +203,15 @@ Utility rights are **delegable** but not **transferable**. Allowing utilities to - Multiple users can benefit from utilities without fragmenting or redistributing ownership. - Utility can be shared over time while ownership remains intact. -### Relationship to ERC-721 +### Relationship to [ERC-721](./erc-721.md) -This standard does not extend ERC-721. ERC-721 defines transferable ownership semantics, while Delegatable Utility Tokens are explicitly non-transferable and only delegable. Rather than inheriting ERC-721 and reverting transfer functions, a separate standard provides a clearer and simpler design. +This standard does not extend [ERC-721](./erc-721.md). [ERC-721](./erc-721.md) defines transferable ownership semantics, while Delegatable Utility Tokens are explicitly non-transferable and only delegable. Rather than inheriting [ERC-721](./erc-721.md) and reverting transfer functions, a separate standard provides a clearer and simpler design. ### Owners and Users Two roles are distinguished: -- **Owner**: the holder of the origin ERC-721 token, and therefore the holder of the corresponding DUT. +- **Owner**: the holder of the origin [ERC-721](./erc-721.md) token, and therefore the holder of the corresponding DUT. - **User**: the account delegated to exercise the usage right. `ownerOf(tokenId)` always returns the current owner of the origin token. @@ -219,7 +219,7 @@ Two roles are distinguished: ### Balance -`balanceOf(owner)` reflects the balance of the origin ERC-721 contract. Delegation state does not affect balances. This preserves compatibility with other ERC standards and makes explicit that ownership of DUTs is derived directly from ownership of the origin NFTs. +`balanceOf(owner)` reflects the balance of the origin [ERC-721](./erc-721.md) contract. Delegation state does not affect balances. This preserves compatibility with other ERC standards and makes explicit that ownership of DUTs is derived directly from ownership of the origin NFTs. ### No Minting Process @@ -235,7 +235,7 @@ Delegation is managed through three functions: ### Approval -An approval system, modeled on ERC-721, enables delegation to be mediated by approved operators. This allows external applications to build markets and coordination mechanisms for usage rights without altering the underlying ownership of the NFT. +An approval system, modeled on [ERC-721](./erc-721.md), enables delegation to be mediated by approved operators. This allows external applications to build markets and coordination mechanisms for usage rights without altering the underlying ownership of the NFT. ## Test Cases @@ -259,4 +259,4 @@ Delegation state may persist across NFT transfers. For example, a seller could d ## Copyright -Copyright and related rights waived via CC0. +Copyright and related rights waived via [CC0](../LICENSE.md). From 0822887f44d49974a41ca974a2b73e036e7d393c Mon Sep 17 00:00:00 2001 From: 0xdagarn Date: Tue, 2 Sep 2025 12:12:04 +0900 Subject: [PATCH 3/5] Update ERCS/erc-6884.md --- ERCS/erc-6884.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/ERCS/erc-6884.md b/ERCS/erc-6884.md index a8b9861bc76..d5c71c4f143 100644 --- a/ERCS/erc-6884.md +++ b/ERCS/erc-6884.md @@ -1,9 +1,9 @@ --- eip: 6884 -title: Delegatable Utility Tokens for ERC-721 NFTs -description: Standard for delegating non-transferable utility rights derived from ERC-721 NFTs. +title: Delegatable Utility Tokens for NFTs +description: Delegate an NFT's utility without transferring ownership. author: Geonwoo Shin (@blgamann), Jongbeom Won (@enginism) -discussions-to: https://ethereum-magicians.org/t/eip-6884-delegatable-utility-tokens-derived-from-origin-nfts +discussions-to: https://ethereum-magicians.org/t/eip-6884-delegatable-utility-tokens-derived-from-origin-nfts/13837 status: Draft type: Standards Track category: ERC @@ -251,7 +251,7 @@ yarn hardhat test test/test.js ## Reference Implementation -See [ERC6884.sol](../assets/erc-6884/contracts/ERC6884.sol). +See [reference implementation](../assets/erc-6884/contracts/ERC6884.sol). ## Security Considerations From 98899ce0c42f5a230148f54ba94fcd94b0e01056 Mon Sep 17 00:00:00 2001 From: 0xdagarn Date: Tue, 2 Sep 2025 12:32:45 +0900 Subject: [PATCH 4/5] Update ERCS/erc-6884.md --- ERCS/erc-6884.md | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/ERCS/erc-6884.md b/ERCS/erc-6884.md index d5c71c4f143..91f13fe0996 100644 --- a/ERCS/erc-6884.md +++ b/ERCS/erc-6884.md @@ -13,17 +13,17 @@ requires: 165, 712 ## Abstract -This ERC specifies Delegatable Utility Tokens (DUT), which allow utility rights to be associated with [ERC-721](./erc-721.md) origin tokens. Ownership of each utility remains tied to the origin token owner, while usage rights can be delegated to other addresses without transferring ownership. +This ERC specifies Delegatable Utility Tokens (DUT), which allow utility rights to be associated with [ERC-721](./eip-721.md) origin tokens. Ownership of each utility remains tied to the origin token owner, while usage rights can be delegated to other addresses without transferring ownership. ## Motivation -Most [ERC-721](./erc-721.md) NFTs provide limited or underutilized utility. These limitations become more apparent as NFTs accumulate multiple utilities and can be categorized as follows: +Most [ERC-721](./eip-721.md) NFTs provide limited or underutilized utility. These limitations become more apparent as NFTs accumulate multiple utilities and can be categorized as follows: 1. **Supply-side limitation**: Utilities are typically provided only by the project team or a small subset of holders, restricting broader ecosystem participation. 2. **Demand-side limitation**: A single owner cannot fully utilize all available utilities, leaving potential value unrealized. 3. **Time limitation**: Even if many utilities are attached to an NFT, one holder has limited time and therefore cannot make use of them all. -This standard addresses these limitations by defining Delegatable Utility Tokens (DUT). A DUT binds utility rights to an [ERC-721](./erc-721.md) origin token while allowing usage rights to be delegated independently from ownership. DUTs remain tied to the current owner of the origin token, and when ownership of the origin token changes, all associated DUTs automatically transfer to the new owner without additional transactions. +This standard addresses these limitations by defining Delegatable Utility Tokens (DUT). A DUT binds utility rights to an [ERC-721](./eip-721.md) origin token while allowing usage rights to be delegated independently from ownership. DUTs remain tied to the current owner of the origin token, and when ownership of the origin token changes, all associated DUTs automatically transfer to the new owner without additional transactions. ## Specification @@ -166,7 +166,7 @@ interface IERC6884Metadata /* is IERC6884 */ { } ``` -The metadata JSON schema follows the same specifications as the metadata schema used in [ERC-721](./erc-721.md). +The metadata JSON schema follows the same specifications as the metadata schema used in [ERC-721](./eip-721.md). ```json { @@ -203,15 +203,15 @@ Utility rights are **delegable** but not **transferable**. Allowing utilities to - Multiple users can benefit from utilities without fragmenting or redistributing ownership. - Utility can be shared over time while ownership remains intact. -### Relationship to [ERC-721](./erc-721.md) +### Relationship to [ERC-721](./eip-721.md) -This standard does not extend [ERC-721](./erc-721.md). [ERC-721](./erc-721.md) defines transferable ownership semantics, while Delegatable Utility Tokens are explicitly non-transferable and only delegable. Rather than inheriting [ERC-721](./erc-721.md) and reverting transfer functions, a separate standard provides a clearer and simpler design. +This standard does not extend [ERC-721](./eip-721.md). [ERC-721](./eip-721.md) defines transferable ownership semantics, while Delegatable Utility Tokens are explicitly non-transferable and only delegable. Rather than inheriting [ERC-721](./eip-721.md) and reverting transfer functions, a separate standard provides a clearer and simpler design. ### Owners and Users Two roles are distinguished: -- **Owner**: the holder of the origin [ERC-721](./erc-721.md) token, and therefore the holder of the corresponding DUT. +- **Owner**: the holder of the origin [ERC-721](./eip-721.md) token, and therefore the holder of the corresponding DUT. - **User**: the account delegated to exercise the usage right. `ownerOf(tokenId)` always returns the current owner of the origin token. @@ -219,7 +219,7 @@ Two roles are distinguished: ### Balance -`balanceOf(owner)` reflects the balance of the origin [ERC-721](./erc-721.md) contract. Delegation state does not affect balances. This preserves compatibility with other ERC standards and makes explicit that ownership of DUTs is derived directly from ownership of the origin NFTs. +`balanceOf(owner)` reflects the balance of the origin [ERC-721](./eip-721.md) contract. Delegation state does not affect balances. This preserves compatibility with other ERC standards and makes explicit that ownership of DUTs is derived directly from ownership of the origin NFTs. ### No Minting Process @@ -235,7 +235,7 @@ Delegation is managed through three functions: ### Approval -An approval system, modeled on [ERC-721](./erc-721.md), enables delegation to be mediated by approved operators. This allows external applications to build markets and coordination mechanisms for usage rights without altering the underlying ownership of the NFT. +An approval system, modeled on [ERC-721](./eip-721.md), enables delegation to be mediated by approved operators. This allows external applications to build markets and coordination mechanisms for usage rights without altering the underlying ownership of the NFT. ## Test Cases @@ -251,7 +251,7 @@ yarn hardhat test test/test.js ## Reference Implementation -See [reference implementation](../assets/erc-6884/contracts/ERC6884.sol). +See [reference implementation](../assets/eip-6884/contracts/ERC6884.sol). ## Security Considerations From 1e18ddbf3098b50eb13bec5d0912ce5caa019d7e Mon Sep 17 00:00:00 2001 From: blgamann <102012918+blgamann@users.noreply.github.com> Date: Thu, 11 Sep 2025 08:34:23 +0900 Subject: [PATCH 5/5] Update ERCS/erc-6884.md Co-authored-by: Mercy Boma Naps Nkari <96525594+bomanaps@users.noreply.github.com> --- ERCS/erc-6884.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ERCS/erc-6884.md b/ERCS/erc-6884.md index 91f13fe0996..a561cc11088 100644 --- a/ERCS/erc-6884.md +++ b/ERCS/erc-6884.md @@ -29,7 +29,7 @@ This standard addresses these limitations by defining Delegatable Utility Tokens 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. -Every contract compliant with this standard contract must implement the `IERC6884` and `IERC165` interfaces: +Every contract compliant with this standard contract MUST implement the `IERC6884` and `IERC165` interfaces: ```solidity pragma solidity ^0.8.0;