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ERC-721
NFT
Overview
Max Total Supply
1,230 NOUN
Holders
348
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
1 NOUNLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
NounsToken
Compiler Version
v0.8.6+commit.11564f7e
Optimization Enabled:
Yes with 10000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0 /// @title The Nouns ERC-721 token /********************************* * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * *********************************/ pragma solidity ^0.8.6; import { Ownable } from '@openzeppelin/contracts/access/Ownable.sol'; import { ERC721Checkpointable } from './base/ERC721Checkpointable.sol'; import { INounsDescriptor } from './interfaces/INounsDescriptor.sol'; import { INounsSeeder } from './interfaces/INounsSeeder.sol'; import { INounsToken } from './interfaces/INounsToken.sol'; import { ERC721 } from './base/ERC721.sol'; import { IERC721 } from '@openzeppelin/contracts/token/ERC721/IERC721.sol'; import { IProxyRegistry } from './external/opensea/IProxyRegistry.sol'; contract NounsToken is INounsToken, Ownable, ERC721Checkpointable { // The nounders DAO address (creators org) address public noundersDAO; // An address who has permissions to mint Nouns address public minter; // The Nouns token URI descriptor INounsDescriptor public descriptor; // The Nouns token seeder INounsSeeder public seeder; // Whether the minter can be updated bool public isMinterLocked; // Whether the descriptor can be updated bool public isDescriptorLocked; // Whether the seeder can be updated bool public isSeederLocked; // The noun seeds mapping(uint256 => INounsSeeder.Seed) public seeds; // The internal noun ID tracker uint256 private _currentNounId; // IPFS content hash of contract-level metadata string private _contractURIHash = 'QmZi1n79FqWt2tTLwCqiy6nLM6xLGRsEPQ5JmReJQKNNzX'; // OpenSea's Proxy Registry IProxyRegistry public immutable proxyRegistry; /** * @notice Require that the minter has not been locked. */ modifier whenMinterNotLocked() { require(!isMinterLocked, 'Minter is locked'); _; } /** * @notice Require that the descriptor has not been locked. */ modifier whenDescriptorNotLocked() { require(!isDescriptorLocked, 'Descriptor is locked'); _; } /** * @notice Require that the seeder has not been locked. */ modifier whenSeederNotLocked() { require(!isSeederLocked, 'Seeder is locked'); _; } /** * @notice Require that the sender is the nounders DAO. */ modifier onlyNoundersDAO() { require(msg.sender == noundersDAO, 'Sender is not the nounders DAO'); _; } /** * @notice Require that the sender is the minter. */ modifier onlyMinter() { require(msg.sender == minter, 'Sender is not the minter'); _; } constructor( address _noundersDAO, address _minter, INounsDescriptor _descriptor, INounsSeeder _seeder, IProxyRegistry _proxyRegistry ) ERC721('Nouns', 'NOUN') { noundersDAO = _noundersDAO; minter = _minter; descriptor = _descriptor; seeder = _seeder; proxyRegistry = _proxyRegistry; } /** * @notice The IPFS URI of contract-level metadata. */ function contractURI() public view returns (string memory) { return string(abi.encodePacked('ipfs://', _contractURIHash)); } /** * @notice Set the _contractURIHash. * @dev Only callable by the owner. */ function setContractURIHash(string memory newContractURIHash) external onlyOwner { _contractURIHash = newContractURIHash; } /** * @notice Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-less listings. */ function isApprovedForAll(address owner, address operator) public view override(IERC721, ERC721) returns (bool) { // Whitelist OpenSea proxy contract for easy trading. if (proxyRegistry.proxies(owner) == operator) { return true; } return super.isApprovedForAll(owner, operator); } /** * @notice Mint a Noun to the minter, along with a possible nounders reward * Noun. Nounders reward Nouns are minted every 10 Nouns, starting at 0, * until 183 nounder Nouns have been minted (5 years w/ 24 hour auctions). * @dev Call _mintTo with the to address(es). */ function mint() public override onlyMinter returns (uint256) { if (_currentNounId <= 1820 && _currentNounId % 10 == 0) { _mintTo(noundersDAO, _currentNounId++); } return _mintTo(minter, _currentNounId++); } /** * @notice Burn a noun. */ function burn(uint256 nounId) public override onlyMinter { _burn(nounId); emit NounBurned(nounId); } /** * @notice A distinct Uniform Resource Identifier (URI) for a given asset. * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view override returns (string memory) { require(_exists(tokenId), 'NounsToken: URI query for nonexistent token'); return descriptor.tokenURI(tokenId, seeds[tokenId]); } /** * @notice Similar to `tokenURI`, but always serves a base64 encoded data URI * with the JSON contents directly inlined. */ function dataURI(uint256 tokenId) public view override returns (string memory) { require(_exists(tokenId), 'NounsToken: URI query for nonexistent token'); return descriptor.dataURI(tokenId, seeds[tokenId]); } /** * @notice Set the nounders DAO. * @dev Only callable by the nounders DAO when not locked. */ function setNoundersDAO(address _noundersDAO) external override onlyNoundersDAO { noundersDAO = _noundersDAO; emit NoundersDAOUpdated(_noundersDAO); } /** * @notice Set the token minter. * @dev Only callable by the owner when not locked. */ function setMinter(address _minter) external override onlyOwner whenMinterNotLocked { minter = _minter; emit MinterUpdated(_minter); } /** * @notice Lock the minter. * @dev This cannot be reversed and is only callable by the owner when not locked. */ function lockMinter() external override onlyOwner whenMinterNotLocked { isMinterLocked = true; emit MinterLocked(); } /** * @notice Set the token URI descriptor. * @dev Only callable by the owner when not locked. */ function setDescriptor(INounsDescriptor _descriptor) external override onlyOwner whenDescriptorNotLocked { descriptor = _descriptor; emit DescriptorUpdated(_descriptor); } /** * @notice Lock the descriptor. * @dev This cannot be reversed and is only callable by the owner when not locked. */ function lockDescriptor() external override onlyOwner whenDescriptorNotLocked { isDescriptorLocked = true; emit DescriptorLocked(); } /** * @notice Set the token seeder. * @dev Only callable by the owner when not locked. */ function setSeeder(INounsSeeder _seeder) external override onlyOwner whenSeederNotLocked { seeder = _seeder; emit SeederUpdated(_seeder); } /** * @notice Lock the seeder. * @dev This cannot be reversed and is only callable by the owner when not locked. */ function lockSeeder() external override onlyOwner whenSeederNotLocked { isSeederLocked = true; emit SeederLocked(); } /** * @notice Mint a Noun with `nounId` to the provided `to` address. */ function _mintTo(address to, uint256 nounId) internal returns (uint256) { INounsSeeder.Seed memory seed = seeds[nounId] = seeder.generateSeed(nounId, descriptor); _mint(owner(), to, nounId); emit NounCreated(nounId, seed); return nounId; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _setOwner(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _setOwner(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: BSD-3-Clause /// @title Vote checkpointing for an ERC-721 token /********************************* * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * *********************************/ // LICENSE // ERC721Checkpointable.sol uses and modifies part of Compound Lab's Comp.sol: // https://github.com/compound-finance/compound-protocol/blob/ae4388e780a8d596d97619d9704a931a2752c2bc/contracts/Governance/Comp.sol // // Comp.sol source code Copyright 2020 Compound Labs, Inc. licensed under the BSD-3-Clause license. // With modifications by Nounders DAO. // // Additional conditions of BSD-3-Clause can be found here: https://opensource.org/licenses/BSD-3-Clause // // MODIFICATIONS // Checkpointing logic from Comp.sol has been used with the following modifications: // - `delegates` is renamed to `_delegates` and is set to private // - `delegates` is a public function that uses the `_delegates` mapping look-up, but unlike // Comp.sol, returns the delegator's own address if there is no delegate. // This avoids the delegator needing to "delegate to self" with an additional transaction // - `_transferTokens()` is renamed `_beforeTokenTransfer()` and adapted to hook into OpenZeppelin's ERC721 hooks. pragma solidity ^0.8.6; import './ERC721Enumerable.sol'; abstract contract ERC721Checkpointable is ERC721Enumerable { /// @notice Defines decimals as per ERC-20 convention to make integrations with 3rd party governance platforms easier uint8 public constant decimals = 0; /// @notice A record of each accounts delegate mapping(address => address) private _delegates; /// @notice A checkpoint for marking number of votes from a given block struct Checkpoint { uint32 fromBlock; uint96 votes; } /// @notice A record of votes checkpoints for each account, by index mapping(address => mapping(uint32 => Checkpoint)) public checkpoints; /// @notice The number of checkpoints for each account mapping(address => uint32) public numCheckpoints; /// @notice The EIP-712 typehash for the contract's domain bytes32 public constant DOMAIN_TYPEHASH = keccak256('EIP712Domain(string name,uint256 chainId,address verifyingContract)'); /// @notice The EIP-712 typehash for the delegation struct used by the contract bytes32 public constant DELEGATION_TYPEHASH = keccak256('Delegation(address delegatee,uint256 nonce,uint256 expiry)'); /// @notice A record of states for signing / validating signatures mapping(address => uint256) public nonces; /// @notice An event thats emitted when an account changes its delegate event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate); /// @notice An event thats emitted when a delegate account's vote balance changes event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance); /** * @notice The votes a delegator can delegate, which is the current balance of the delegator. * @dev Used when calling `_delegate()` */ function votesToDelegate(address delegator) public view returns (uint96) { return safe96(balanceOf(delegator), 'ERC721Checkpointable::votesToDelegate: amount exceeds 96 bits'); } /** * @notice Overrides the standard `Comp.sol` delegates mapping to return * the delegator's own address if they haven't delegated. * This avoids having to delegate to oneself. */ function delegates(address delegator) public view returns (address) { address current = _delegates[delegator]; return current == address(0) ? delegator : current; } /** * @notice Adapted from `_transferTokens()` in `Comp.sol` to update delegate votes. * @dev hooks into OpenZeppelin's `ERC721._transfer` */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal override { super._beforeTokenTransfer(from, to, tokenId); /// @notice Differs from `_transferTokens()` to use `delegates` override method to simulate auto-delegation _moveDelegates(delegates(from), delegates(to), 1); } /** * @notice Delegate votes from `msg.sender` to `delegatee` * @param delegatee The address to delegate votes to */ function delegate(address delegatee) public { if (delegatee == address(0)) delegatee = msg.sender; return _delegate(msg.sender, delegatee); } /** * @notice Delegates votes from signatory to `delegatee` * @param delegatee The address to delegate votes to * @param nonce The contract state required to match the signature * @param expiry The time at which to expire the signature * @param v The recovery byte of the signature * @param r Half of the ECDSA signature pair * @param s Half of the ECDSA signature pair */ function delegateBySig( address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s ) public { bytes32 domainSeparator = keccak256( abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name())), getChainId(), address(this)) ); bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry)); bytes32 digest = keccak256(abi.encodePacked('\x19\x01', domainSeparator, structHash)); address signatory = ecrecover(digest, v, r, s); require(signatory != address(0), 'ERC721Checkpointable::delegateBySig: invalid signature'); require(nonce == nonces[signatory]++, 'ERC721Checkpointable::delegateBySig: invalid nonce'); require(block.timestamp <= expiry, 'ERC721Checkpointable::delegateBySig: signature expired'); return _delegate(signatory, delegatee); } /** * @notice Gets the current votes balance for `account` * @param account The address to get votes balance * @return The number of current votes for `account` */ function getCurrentVotes(address account) external view returns (uint96) { uint32 nCheckpoints = numCheckpoints[account]; return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0; } /** * @notice Determine the prior number of votes for an account as of a block number * @dev Block number must be a finalized block or else this function will revert to prevent misinformation. * @param account The address of the account to check * @param blockNumber The block number to get the vote balance at * @return The number of votes the account had as of the given block */ function getPriorVotes(address account, uint256 blockNumber) public view returns (uint96) { require(blockNumber < block.number, 'ERC721Checkpointable::getPriorVotes: not yet determined'); uint32 nCheckpoints = numCheckpoints[account]; if (nCheckpoints == 0) { return 0; } // First check most recent balance if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) { return checkpoints[account][nCheckpoints - 1].votes; } // Next check implicit zero balance if (checkpoints[account][0].fromBlock > blockNumber) { return 0; } uint32 lower = 0; uint32 upper = nCheckpoints - 1; while (upper > lower) { uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow Checkpoint memory cp = checkpoints[account][center]; if (cp.fromBlock == blockNumber) { return cp.votes; } else if (cp.fromBlock < blockNumber) { lower = center; } else { upper = center - 1; } } return checkpoints[account][lower].votes; } function _delegate(address delegator, address delegatee) internal { /// @notice differs from `_delegate()` in `Comp.sol` to use `delegates` override method to simulate auto-delegation address currentDelegate = delegates(delegator); _delegates[delegator] = delegatee; emit DelegateChanged(delegator, currentDelegate, delegatee); uint96 amount = votesToDelegate(delegator); _moveDelegates(currentDelegate, delegatee, amount); } function _moveDelegates( address srcRep, address dstRep, uint96 amount ) internal { if (srcRep != dstRep && amount > 0) { if (srcRep != address(0)) { uint32 srcRepNum = numCheckpoints[srcRep]; uint96 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0; uint96 srcRepNew = sub96(srcRepOld, amount, 'ERC721Checkpointable::_moveDelegates: amount underflows'); _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew); } if (dstRep != address(0)) { uint32 dstRepNum = numCheckpoints[dstRep]; uint96 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0; uint96 dstRepNew = add96(dstRepOld, amount, 'ERC721Checkpointable::_moveDelegates: amount overflows'); _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew); } } } function _writeCheckpoint( address delegatee, uint32 nCheckpoints, uint96 oldVotes, uint96 newVotes ) internal { uint32 blockNumber = safe32( block.number, 'ERC721Checkpointable::_writeCheckpoint: block number exceeds 32 bits' ); if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) { checkpoints[delegatee][nCheckpoints - 1].votes = newVotes; } else { checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes); numCheckpoints[delegatee] = nCheckpoints + 1; } emit DelegateVotesChanged(delegatee, oldVotes, newVotes); } function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) { require(n < 2**32, errorMessage); return uint32(n); } function safe96(uint256 n, string memory errorMessage) internal pure returns (uint96) { require(n < 2**96, errorMessage); return uint96(n); } function add96( uint96 a, uint96 b, string memory errorMessage ) internal pure returns (uint96) { uint96 c = a + b; require(c >= a, errorMessage); return c; } function sub96( uint96 a, uint96 b, string memory errorMessage ) internal pure returns (uint96) { require(b <= a, errorMessage); return a - b; } function getChainId() internal view returns (uint256) { uint256 chainId; assembly { chainId := chainid() } return chainId; } }
// SPDX-License-Identifier: GPL-3.0 /// @title Interface for NounsDescriptor /********************************* * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * *********************************/ pragma solidity ^0.8.6; import { INounsSeeder } from './INounsSeeder.sol'; interface INounsDescriptor { event PartsLocked(); event DataURIToggled(bool enabled); event BaseURIUpdated(string baseURI); function arePartsLocked() external returns (bool); function isDataURIEnabled() external returns (bool); function baseURI() external returns (string memory); function palettes(uint8 paletteIndex, uint256 colorIndex) external view returns (string memory); function backgrounds(uint256 index) external view returns (string memory); function bodies(uint256 index) external view returns (bytes memory); function accessories(uint256 index) external view returns (bytes memory); function heads(uint256 index) external view returns (bytes memory); function glasses(uint256 index) external view returns (bytes memory); function backgroundCount() external view returns (uint256); function bodyCount() external view returns (uint256); function accessoryCount() external view returns (uint256); function headCount() external view returns (uint256); function glassesCount() external view returns (uint256); function addManyColorsToPalette(uint8 paletteIndex, string[] calldata newColors) external; function addManyBackgrounds(string[] calldata backgrounds) external; function addManyBodies(bytes[] calldata bodies) external; function addManyAccessories(bytes[] calldata accessories) external; function addManyHeads(bytes[] calldata heads) external; function addManyGlasses(bytes[] calldata glasses) external; function addColorToPalette(uint8 paletteIndex, string calldata color) external; function addBackground(string calldata background) external; function addBody(bytes calldata body) external; function addAccessory(bytes calldata accessory) external; function addHead(bytes calldata head) external; function addGlasses(bytes calldata glasses) external; function lockParts() external; function toggleDataURIEnabled() external; function setBaseURI(string calldata baseURI) external; function tokenURI(uint256 tokenId, INounsSeeder.Seed memory seed) external view returns (string memory); function dataURI(uint256 tokenId, INounsSeeder.Seed memory seed) external view returns (string memory); function genericDataURI( string calldata name, string calldata description, INounsSeeder.Seed memory seed ) external view returns (string memory); function generateSVGImage(INounsSeeder.Seed memory seed) external view returns (string memory); }
// SPDX-License-Identifier: GPL-3.0 /// @title Interface for NounsSeeder /********************************* * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * *********************************/ pragma solidity ^0.8.6; import { INounsDescriptor } from './INounsDescriptor.sol'; interface INounsSeeder { struct Seed { uint48 background; uint48 body; uint48 accessory; uint48 head; uint48 glasses; } function generateSeed(uint256 nounId, INounsDescriptor descriptor) external view returns (Seed memory); }
// SPDX-License-Identifier: GPL-3.0 /// @title Interface for NounsToken /********************************* * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * *********************************/ pragma solidity ^0.8.6; import { IERC721 } from '@openzeppelin/contracts/token/ERC721/IERC721.sol'; import { INounsDescriptor } from './INounsDescriptor.sol'; import { INounsSeeder } from './INounsSeeder.sol'; interface INounsToken is IERC721 { event NounCreated(uint256 indexed tokenId, INounsSeeder.Seed seed); event NounBurned(uint256 indexed tokenId); event NoundersDAOUpdated(address noundersDAO); event MinterUpdated(address minter); event MinterLocked(); event DescriptorUpdated(INounsDescriptor descriptor); event DescriptorLocked(); event SeederUpdated(INounsSeeder seeder); event SeederLocked(); function mint() external returns (uint256); function burn(uint256 tokenId) external; function dataURI(uint256 tokenId) external returns (string memory); function setNoundersDAO(address noundersDAO) external; function setMinter(address minter) external; function lockMinter() external; function setDescriptor(INounsDescriptor descriptor) external; function lockDescriptor() external; function setSeeder(INounsSeeder seeder) external; function lockSeeder() external; }
// SPDX-License-Identifier: MIT /// @title ERC721 Token Implementation /********************************* * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * *********************************/ // LICENSE // ERC721.sol modifies OpenZeppelin's ERC721.sol: // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/6618f9f18424ade44116d0221719f4c93be6a078/contracts/token/ERC721/ERC721.sol // // ERC721.sol source code copyright OpenZeppelin licensed under the MIT License. // With modifications by Nounders DAO. // // // MODIFICATIONS: // `_safeMint` and `_mint` contain an additional `creator` argument and // emit two `Transfer` logs, rather than one. The first log displays the // transfer (mint) from `address(0)` to the `creator`. The second displays the // transfer from the `creator` to the `to` address. This enables correct // attribution on various NFT marketplaces. pragma solidity ^0.8.6; import '@openzeppelin/contracts/token/ERC721/IERC721.sol'; import '@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol'; import '@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol'; import '@openzeppelin/contracts/utils/Address.sol'; import '@openzeppelin/contracts/utils/Context.sol'; import '@openzeppelin/contracts/utils/Strings.sol'; import '@openzeppelin/contracts/utils/introspection/ERC165.sol'; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), 'ERC721: balance query for the zero address'); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), 'ERC721: owner query for nonexistent token'); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), 'ERC721Metadata: URI query for nonexistent token'); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ''; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ''; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, 'ERC721: approval to current owner'); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), 'ERC721: approve caller is not owner nor approved for all' ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), 'ERC721: approved query for nonexistent token'); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { require(operator != _msgSender(), 'ERC721: approve to caller'); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), 'ERC721: transfer caller is not owner nor approved'); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ''); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), 'ERC721: transfer caller is not owner nor approved'); _safeTransfer(from, to, tokenId, _data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `_data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory _data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), 'ERC721: transfer to non ERC721Receiver implementer'); } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _owners[tokenId] != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), 'ERC721: operator query for nonexistent token'); address owner = ERC721.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Safely mints `tokenId`, transfers it to `to`, and emits two log events - * 1. Credits the `minter` with the mint. * 2. Shows transfer from the `minter` to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint( address creator, address to, uint256 tokenId ) internal virtual { _safeMint(creator, to, tokenId, ''); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address creator, address to, uint256 tokenId, bytes memory _data ) internal virtual { _mint(creator, to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, _data), 'ERC721: transfer to non ERC721Receiver implementer' ); } /** * @dev Mints `tokenId`, transfers it to `to`, and emits two log events - * 1. Credits the `creator` with the mint. * 2. Shows transfer from the `creator` to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint( address creator, address to, uint256 tokenId ) internal virtual { require(to != address(0), 'ERC721: mint to the zero address'); require(!_exists(tokenId), 'ERC721: token already minted'); _beforeTokenTransfer(address(0), to, tokenId); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), creator, tokenId); emit Transfer(creator, to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer( address from, address to, uint256 tokenId ) internal virtual { require(ERC721.ownerOf(tokenId) == from, 'ERC721: transfer of token that is not own'); require(to != address(0), 'ERC721: transfer to the zero address'); _beforeTokenTransfer(from, to, tokenId); // Clear approvals from the previous owner _approve(address(0), tokenId); _balances[from] -= 1; _balances[to] += 1; _owners[tokenId] = to; emit Transfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits a {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes memory _data ) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721Receiver(to).onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert('ERC721: transfer to non ERC721Receiver implementer'); } else { assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes calldata data ) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; interface IProxyRegistry { function proxies(address) external view returns (address); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT /// @title ERC721 Enumerable Extension /********************************* * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * * βββββββββββββββββββββββββββββ * *********************************/ // LICENSE // ERC721.sol modifies OpenZeppelin's ERC721Enumerable.sol: // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/6618f9f18424ade44116d0221719f4c93be6a078/contracts/token/ERC721/extensions/ERC721Enumerable.sol // // ERC721Enumerable.sol source code copyright OpenZeppelin licensed under the MIT License. // With modifications by Nounders DAO. // // MODIFICATIONS: // Consumes modified `ERC721` contract. See notes in `ERC721.sol`. pragma solidity ^0.8.0; import './ERC721.sol'; import '@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol'; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), 'ERC721Enumerable: owner index out of bounds'); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), 'ERC721Enumerable: global index out of bounds'); return _allTokens[index]; } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) private pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
{ "optimizer": { "enabled": true, "runs": 10000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} }
Contract Security Audit
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INounsSeeder","name":"_seeder","type":"address"}],"name":"setSeeder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"delegator","type":"address"}],"name":"votesToDelegate","outputs":[{"internalType":"uint96","name":"","type":"uint96"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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2c30493f60c83bfab2fa64736f6c63430008060033
Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000002573c60a6d127755aa2dc85e342f7da2378a0cc5000000000000000000000000830bd73e4184cef73443c15111a1df14e495c7060000000000000000000000000cfdb3ba1694c2bb2cfacb0339ad7b1ae5932b63000000000000000000000000cc8a0fb5ab3c7132c1b2a0109142fb112c4ce515000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
-----Decoded View---------------
Arg [0] : _noundersDAO (address): 0x2573C60a6D127755aA2DC85e342F7da2378a0Cc5
Arg [1] : _minter (address): 0x830BD73E4184ceF73443C15111a1DF14e495C706
Arg [2] : _descriptor (address): 0x0Cfdb3Ba1694c2bb2CFACB0339ad7b1Ae5932B63
Arg [3] : _seeder (address): 0xCC8a0FB5ab3C7132c1b2A0109142Fb112c4Ce515
Arg [4] : _proxyRegistry (address): 0xa5409ec958C83C3f309868babACA7c86DCB077c1
-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000002573c60a6d127755aa2dc85e342f7da2378a0cc5
Arg [1] : 000000000000000000000000830bd73e4184cef73443c15111a1df14e495c706
Arg [2] : 0000000000000000000000000cfdb3ba1694c2bb2cfacb0339ad7b1ae5932b63
Arg [3] : 000000000000000000000000cc8a0fb5ab3c7132c1b2a0109142fb112c4ce515
Arg [4] : 000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
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