ERC-721
NFT
Overview
Max Total Supply
4,004 NOTDITTO
Holders
1,542
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
1 NOTDITTOLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
NotDitto
Compiler Version
v0.8.14+commit.80d49f37
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.14; import "erc721a/contracts/extensions/ERC721AQueryable.sol"; import "@openzeppelin/contracts/interfaces/IERC2981.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "./IMetadata.sol"; // @title: NOT DITTO //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// /////////////////////////@@///////////////////////////@@//////////////////////// /////////////////////////@@//////////////////////////@@@//////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// ////////////@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@/////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// contract NotDitto is ERC721AQueryable, Ownable, ReentrancyGuard, IERC2981 { // ._. Errors ._. error SoldOut(); error SaleInactive(); error MintAllowanceSurpassed(); error TransferPaused(); error TransferControlRevoked(); error NotOwner(); error TokenIdHasMorphed(); error MorphDataClaimed(); error MorphInactive(); error UnmorphInactive(); error MorphCooldown(); error SenderNotMorpher(); error TokenHasNotMorphed(); // ._. Events ._. event Morphed( uint32 indexed tokenId, address indexed morphAddress, uint32 indexed morphId ); event MorphedSol(uint32 indexed tokenId, string indexed morphAddressSol); event Unmorphed(uint32 indexed tokenId); // ._. Metadata ._. string public baseTokenURI; address public metadataAddress; // ._. Sale Status ._. uint256 public maxSupply = 4444; uint256 public teamSupply = 444; uint256 public maxPerTransaction = 3; bool public isSaleActive = false; // ._. Transfer Status ._. bool public isTransferPaused = false; bool public isTransferControlRevoked = false; // ._. Royalties ._. address public royaltyAddress; uint256 public royaltyPercent = 0; // ._. Morph ._. enum Chains { ETH, SOL } struct MorphData { uint32 morphId; address morphAddress; string morphAddressSol; uint256 morphTimestamp; Chains morphChain; } mapping(uint32 => MorphData) public tokenIdToMorphData; mapping(bytes32 => uint32) public morphHashToTokenId; uint256 public morphCooldown = 172800; bool public isMorphActive = true; bool public isUnmorphActive = true; address public morpherAddress; modifier onlyMorpher() { if (msg.sender != morpherAddress) revert SenderNotMorpher(); _; } // ._. Constructors ._. constructor(string memory _baseTokenURI) ERC721A("NOT DITTO", "NOTDITTO") { baseTokenURI = _baseTokenURI; royaltyAddress = msg.sender; } function _baseURI() internal view virtual override returns (string memory) { return baseTokenURI; } // ._. Mint ._. function mint(uint256 _amount) external nonReentrant { if (!isSaleActive) revert SaleInactive(); if (totalSupply() + _amount > maxSupply - teamSupply) revert SoldOut(); if (_amount > maxPerTransaction) revert MintAllowanceSurpassed(); _safeMint(msg.sender, _amount); } function mintTeam(address _to, uint256 _amount) external onlyOwner { if (_amount > teamSupply) revert SoldOut(); teamSupply -= _amount; _safeMint(_to, _amount); } function setMaxPerTransaction(uint256 _maxPerTransaction) external onlyOwner { maxPerTransaction = _maxPerTransaction; } function setTeamSupply(uint256 _teamSupply) external onlyOwner { teamSupply = _teamSupply; } function toggleSale() external onlyOwner { isSaleActive = !isSaleActive; } // ._. Morph ._. function morph( uint32 _tokenId, address _morphAddress, uint32 _morphId ) external { if (!isMorphActive) revert MorphInactive(); if (ownerOf(_tokenId) != msg.sender) revert NotOwner(); bytes32 morphHash = keccak256(abi.encodePacked(_morphAddress, _morphId)); if (morphHashToTokenId[morphHash] != 0) revert MorphDataClaimed(); if (address(tokenIdToMorphData[_tokenId].morphAddress) != address(0)) revert TokenIdHasMorphed(); if (bytes(tokenIdToMorphData[_tokenId].morphAddressSol).length != 0) revert TokenIdHasMorphed(); morphHashToTokenId[morphHash] = _tokenId; tokenIdToMorphData[_tokenId] = MorphData({ morphId: _morphId, morphAddress: _morphAddress, morphAddressSol: "", morphTimestamp: block.timestamp, morphChain: Chains.ETH }); emit Morphed(_tokenId, _morphAddress, _morphId); } function morphSol(uint32 _tokenId, string memory _morphAddressSol) external { if (!isMorphActive) revert MorphInactive(); if (ownerOf(_tokenId) != msg.sender) revert NotOwner(); bytes32 morphHash = keccak256(abi.encodePacked(_morphAddressSol)); if (morphHashToTokenId[morphHash] != 0) revert MorphDataClaimed(); if (address(tokenIdToMorphData[_tokenId].morphAddress) != address(0)) revert TokenIdHasMorphed(); if (bytes(tokenIdToMorphData[_tokenId].morphAddressSol).length != 0) revert TokenIdHasMorphed(); morphHashToTokenId[morphHash] = _tokenId; tokenIdToMorphData[_tokenId] = MorphData({ morphId: 0, morphAddress: address(0), morphAddressSol: _morphAddressSol, morphTimestamp: block.timestamp, morphChain: Chains.SOL }); emit MorphedSol(_tokenId, _morphAddressSol); } function unmorph(uint32 _tokenId) external { if (!isUnmorphActive) revert UnmorphInactive(); if (ownerOf(_tokenId) != msg.sender) revert NotOwner(); if ( block.timestamp < tokenIdToMorphData[_tokenId].morphTimestamp + morphCooldown ) revert MorphCooldown(); bytes32 morphHash = keccak256( abi.encodePacked( tokenIdToMorphData[_tokenId].morphAddress, tokenIdToMorphData[_tokenId].morphId ) ); if (morphHashToTokenId[morphHash] == 0) revert TokenHasNotMorphed(); delete morphHashToTokenId[morphHash]; delete tokenIdToMorphData[_tokenId]; emit Unmorphed(_tokenId); } function unmorphSol(uint32 _tokenId) external { if (!isUnmorphActive) revert UnmorphInactive(); if (ownerOf(_tokenId) != msg.sender) revert NotOwner(); if ( block.timestamp < tokenIdToMorphData[_tokenId].morphTimestamp + morphCooldown ) revert MorphCooldown(); bytes32 morphHash = keccak256( abi.encodePacked(tokenIdToMorphData[_tokenId].morphAddressSol) ); if (morphHashToTokenId[morphHash] == 0) revert TokenHasNotMorphed(); delete morphHashToTokenId[morphHash]; delete tokenIdToMorphData[_tokenId]; emit Unmorphed(_tokenId); } function toggleMorph() external onlyOwner { isMorphActive = !isMorphActive; } function toggleUnmorph() external onlyOwner { isUnmorphActive = !isUnmorphActive; } function setTokenIdToMorphData( uint32 _tokenId, address _morphAddress, uint32 _morphId, string memory _morphAddressSol, Chains _morphChain ) external onlyMorpher { tokenIdToMorphData[_tokenId] = MorphData({ morphId: _morphId, morphAddress: _morphAddress, morphAddressSol: _morphAddressSol, morphTimestamp: block.timestamp, morphChain: _morphChain }); } function setMorphHashToTokenId(bytes32 _morphHash, uint32 _tokenId) external onlyMorpher { morphHashToTokenId[_morphHash] = _tokenId; } function setMorphCooldown(uint256 _morphCooldown) external onlyOwner { morphCooldown = _morphCooldown; } function setMorpher(address _morpherAddress) external onlyOwner { morpherAddress = _morpherAddress; } // ._. Metadata ._. function tokenURI(uint256 _tokenId) public view virtual override(ERC721A, IERC721A) returns (string memory) { if (address(metadataAddress) != address(0)) { if (!_exists(_tokenId)) revert URIQueryForNonexistentToken(); return IMetadata(metadataAddress).tokenURI(_tokenId); } return super.tokenURI(_tokenId); } function dittoURI(uint256 _tokenId) public view virtual returns (string memory) { MorphData memory morphData = tokenIdToMorphData[uint32(_tokenId)]; if ( address(morphData.morphAddress) != address(0) && morphData.morphChain == Chains.ETH ) { if (!_exists(_tokenId)) revert URIQueryForNonexistentToken(); return IMetadata(morphData.morphAddress).tokenURI(morphData.morphId); } else if ( bytes(morphData.morphAddressSol).length != 0 && morphData.morphChain == Chains.SOL ) { if (!_exists(_tokenId)) revert URIQueryForNonexistentToken(); return morphData.morphAddressSol; } return super.tokenURI(_tokenId); } function setMetadataAddress(address _metadataAddress) external onlyOwner { metadataAddress = _metadataAddress; } function setBaseURI(string memory _baseTokenURI) external onlyOwner { baseTokenURI = _baseTokenURI; } // ._. Transfer Control ._. function _beforeTokenTransfers( address, address, uint256 startTokenId, uint256 quantity ) internal view override { if (isTransferPaused) revert TransferPaused(); } function toggleTransfer() external onlyOwner { if (isTransferControlRevoked) revert TransferControlRevoked(); isTransferPaused = !isTransferPaused; } function revokeTransferControl() external onlyOwner { isTransferPaused = false; isTransferControlRevoked = true; } // ._. Misc ._. function royaltyInfo(uint256 tokenId, uint256 salePrice) external view override returns (address receiver, uint256 royaltyAmount) { if (!_exists(tokenId)) revert URIQueryForNonexistentToken(); return (royaltyAddress, (salePrice * royaltyPercent) / 100); } function setRoyaltyAddress(address _royaltyAddress) external onlyOwner { royaltyAddress = _royaltyAddress; } function setRoyaltyPercent(uint256 _royaltyPercent) external onlyOwner { royaltyPercent = _royaltyPercent; } function _startTokenId() internal view virtual override returns (uint256) { return 1; } function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721A, IERC721A, IERC165) returns (bool) { return interfaceId == 0x01ffc9a7 || // ERC165 interface ID for ERC165. interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721. interfaceId == 0x5b5e139f; // ERC165 interface ID for ERC721Metadata. } }
// SPDX-License-Identifier: MIT // ERC721A Contracts v4.2.0 // Creator: Chiru Labs pragma solidity ^0.8.4; import './IERC721AQueryable.sol'; import '../ERC721A.sol'; /** * @title ERC721AQueryable. * * @dev ERC721A subclass with convenience query functions. */ abstract contract ERC721AQueryable is ERC721A, IERC721AQueryable { /** * @dev Returns the `TokenOwnership` struct at `tokenId` without reverting. * * If the `tokenId` is out of bounds: * * - `addr = address(0)` * - `startTimestamp = 0` * - `burned = false` * - `extraData = 0` * * If the `tokenId` is burned: * * - `addr = <Address of owner before token was burned>` * - `startTimestamp = <Timestamp when token was burned>` * - `burned = true` * - `extraData = <Extra data when token was burned>` * * Otherwise: * * - `addr = <Address of owner>` * - `startTimestamp = <Timestamp of start of ownership>` * - `burned = false` * - `extraData = <Extra data at start of ownership>` */ function explicitOwnershipOf(uint256 tokenId) public view virtual override returns (TokenOwnership memory) { TokenOwnership memory ownership; if (tokenId < _startTokenId() || tokenId >= _nextTokenId()) { return ownership; } ownership = _ownershipAt(tokenId); if (ownership.burned) { return ownership; } return _ownershipOf(tokenId); } /** * @dev Returns an array of `TokenOwnership` structs at `tokenIds` in order. * See {ERC721AQueryable-explicitOwnershipOf} */ function explicitOwnershipsOf(uint256[] calldata tokenIds) external view virtual override returns (TokenOwnership[] memory) { unchecked { uint256 tokenIdsLength = tokenIds.length; TokenOwnership[] memory ownerships = new TokenOwnership[](tokenIdsLength); for (uint256 i; i != tokenIdsLength; ++i) { ownerships[i] = explicitOwnershipOf(tokenIds[i]); } return ownerships; } } /** * @dev Returns an array of token IDs owned by `owner`, * in the range [`start`, `stop`) * (i.e. `start <= tokenId < stop`). * * This function allows for tokens to be queried if the collection * grows too big for a single call of {ERC721AQueryable-tokensOfOwner}. * * Requirements: * * - `start < stop` */ function tokensOfOwnerIn( address owner, uint256 start, uint256 stop ) external view virtual override returns (uint256[] memory) { unchecked { if (start >= stop) revert InvalidQueryRange(); uint256 tokenIdsIdx; uint256 stopLimit = _nextTokenId(); // Set `start = max(start, _startTokenId())`. if (start < _startTokenId()) { start = _startTokenId(); } // Set `stop = min(stop, stopLimit)`. if (stop > stopLimit) { stop = stopLimit; } uint256 tokenIdsMaxLength = balanceOf(owner); // Set `tokenIdsMaxLength = min(balanceOf(owner), stop - start)`, // to cater for cases where `balanceOf(owner)` is too big. if (start < stop) { uint256 rangeLength = stop - start; if (rangeLength < tokenIdsMaxLength) { tokenIdsMaxLength = rangeLength; } } else { tokenIdsMaxLength = 0; } uint256[] memory tokenIds = new uint256[](tokenIdsMaxLength); if (tokenIdsMaxLength == 0) { return tokenIds; } // We need to call `explicitOwnershipOf(start)`, // because the slot at `start` may not be initialized. TokenOwnership memory ownership = explicitOwnershipOf(start); address currOwnershipAddr; // If the starting slot exists (i.e. not burned), initialize `currOwnershipAddr`. // `ownership.address` will not be zero, as `start` is clamped to the valid token ID range. if (!ownership.burned) { currOwnershipAddr = ownership.addr; } for (uint256 i = start; i != stop && tokenIdsIdx != tokenIdsMaxLength; ++i) { ownership = _ownershipAt(i); if (ownership.burned) { continue; } if (ownership.addr != address(0)) { currOwnershipAddr = ownership.addr; } if (currOwnershipAddr == owner) { tokenIds[tokenIdsIdx++] = i; } } // Downsize the array to fit. assembly { mstore(tokenIds, tokenIdsIdx) } return tokenIds; } } /** * @dev Returns an array of token IDs owned by `owner`. * * This function scans the ownership mapping and is O(`totalSupply`) in complexity. * It is meant to be called off-chain. * * See {ERC721AQueryable-tokensOfOwnerIn} for splitting the scan into * multiple smaller scans if the collection is large enough to cause * an out-of-gas error (10K collections should be fine). */ function tokensOfOwner(address owner) external view virtual override returns (uint256[] memory) { unchecked { uint256 tokenIdsIdx; address currOwnershipAddr; uint256 tokenIdsLength = balanceOf(owner); uint256[] memory tokenIds = new uint256[](tokenIdsLength); TokenOwnership memory ownership; for (uint256 i = _startTokenId(); tokenIdsIdx != tokenIdsLength; ++i) { ownership = _ownershipAt(i); if (ownership.burned) { continue; } if (ownership.addr != address(0)) { currOwnershipAddr = ownership.addr; } if (currOwnershipAddr == owner) { tokenIds[tokenIdsIdx++] = i; } } return tokenIds; } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol) pragma solidity ^0.8.0; import "../utils/introspection/IERC165.sol"; /** * @dev Interface for the NFT Royalty Standard. * * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal * support for royalty payments across all NFT marketplaces and ecosystem participants. * * _Available since v4.5._ */ interface IERC2981 is IERC165 { /** * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of * exchange. The royalty amount is denominated and should be paid in that same unit of exchange. */ function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/Ownable.sol) 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() { _transferOwnership(_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 { _transferOwnership(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"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.14; abstract contract IMetadata { function tokenURI(uint256 tokenId) external view virtual returns (string memory); }
// SPDX-License-Identifier: MIT // ERC721A Contracts v4.2.0 // Creator: Chiru Labs pragma solidity ^0.8.4; import '../IERC721A.sol'; /** * @dev Interface of ERC721AQueryable. */ interface IERC721AQueryable is IERC721A { /** * Invalid query range (`start` >= `stop`). */ error InvalidQueryRange(); /** * @dev Returns the `TokenOwnership` struct at `tokenId` without reverting. * * If the `tokenId` is out of bounds: * * - `addr = address(0)` * - `startTimestamp = 0` * - `burned = false` * - `extraData = 0` * * If the `tokenId` is burned: * * - `addr = <Address of owner before token was burned>` * - `startTimestamp = <Timestamp when token was burned>` * - `burned = true` * - `extraData = <Extra data when token was burned>` * * Otherwise: * * - `addr = <Address of owner>` * - `startTimestamp = <Timestamp of start of ownership>` * - `burned = false` * - `extraData = <Extra data at start of ownership>` */ function explicitOwnershipOf(uint256 tokenId) external view returns (TokenOwnership memory); /** * @dev Returns an array of `TokenOwnership` structs at `tokenIds` in order. * See {ERC721AQueryable-explicitOwnershipOf} */ function explicitOwnershipsOf(uint256[] memory tokenIds) external view returns (TokenOwnership[] memory); /** * @dev Returns an array of token IDs owned by `owner`, * in the range [`start`, `stop`) * (i.e. `start <= tokenId < stop`). * * This function allows for tokens to be queried if the collection * grows too big for a single call of {ERC721AQueryable-tokensOfOwner}. * * Requirements: * * - `start < stop` */ function tokensOfOwnerIn( address owner, uint256 start, uint256 stop ) external view returns (uint256[] memory); /** * @dev Returns an array of token IDs owned by `owner`. * * This function scans the ownership mapping and is O(`totalSupply`) in complexity. * It is meant to be called off-chain. * * See {ERC721AQueryable-tokensOfOwnerIn} for splitting the scan into * multiple smaller scans if the collection is large enough to cause * an out-of-gas error (10K collections should be fine). */ function tokensOfOwner(address owner) external view returns (uint256[] memory); }
// SPDX-License-Identifier: MIT // ERC721A Contracts v4.2.0 // Creator: Chiru Labs pragma solidity ^0.8.4; import './IERC721A.sol'; /** * @dev Interface of ERC721 token receiver. */ interface ERC721A__IERC721Receiver { function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); } /** * @title ERC721A * * @dev Implementation of the [ERC721](https://eips.ethereum.org/EIPS/eip-721) * Non-Fungible Token Standard, including the Metadata extension. * Optimized for lower gas during batch mints. * * Token IDs are minted in sequential order (e.g. 0, 1, 2, 3, ...) * starting from `_startTokenId()`. * * Assumptions: * * - An owner cannot have more than 2**64 - 1 (max value of uint64) of supply. * - The maximum token ID cannot exceed 2**256 - 1 (max value of uint256). */ contract ERC721A is IERC721A { // Reference type for token approval. struct TokenApprovalRef { address value; } // ============================================================= // CONSTANTS // ============================================================= // Mask of an entry in packed address data. uint256 private constant _BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1; // The bit position of `numberMinted` in packed address data. uint256 private constant _BITPOS_NUMBER_MINTED = 64; // The bit position of `numberBurned` in packed address data. uint256 private constant _BITPOS_NUMBER_BURNED = 128; // The bit position of `aux` in packed address data. uint256 private constant _BITPOS_AUX = 192; // Mask of all 256 bits in packed address data except the 64 bits for `aux`. uint256 private constant _BITMASK_AUX_COMPLEMENT = (1 << 192) - 1; // The bit position of `startTimestamp` in packed ownership. uint256 private constant _BITPOS_START_TIMESTAMP = 160; // The bit mask of the `burned` bit in packed ownership. uint256 private constant _BITMASK_BURNED = 1 << 224; // The bit position of the `nextInitialized` bit in packed ownership. uint256 private constant _BITPOS_NEXT_INITIALIZED = 225; // The bit mask of the `nextInitialized` bit in packed ownership. uint256 private constant _BITMASK_NEXT_INITIALIZED = 1 << 225; // The bit position of `extraData` in packed ownership. uint256 private constant _BITPOS_EXTRA_DATA = 232; // Mask of all 256 bits in a packed ownership except the 24 bits for `extraData`. uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1; // The mask of the lower 160 bits for addresses. uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1; // The maximum `quantity` that can be minted with {_mintERC2309}. // This limit is to prevent overflows on the address data entries. // For a limit of 5000, a total of 3.689e15 calls to {_mintERC2309} // is required to cause an overflow, which is unrealistic. uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000; // The `Transfer` event signature is given by: // `keccak256(bytes("Transfer(address,address,uint256)"))`. bytes32 private constant _TRANSFER_EVENT_SIGNATURE = 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef; // ============================================================= // STORAGE // ============================================================= // The next token ID to be minted. uint256 private _currentIndex; // The number of tokens burned. uint256 private _burnCounter; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to ownership details // An empty struct value does not necessarily mean the token is unowned. // See {_packedOwnershipOf} implementation for details. // // Bits Layout: // - [0..159] `addr` // - [160..223] `startTimestamp` // - [224] `burned` // - [225] `nextInitialized` // - [232..255] `extraData` mapping(uint256 => uint256) private _packedOwnerships; // Mapping owner address to address data. // // Bits Layout: // - [0..63] `balance` // - [64..127] `numberMinted` // - [128..191] `numberBurned` // - [192..255] `aux` mapping(address => uint256) private _packedAddressData; // Mapping from token ID to approved address. mapping(uint256 => TokenApprovalRef) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; // ============================================================= // CONSTRUCTOR // ============================================================= constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; _currentIndex = _startTokenId(); } // ============================================================= // TOKEN COUNTING OPERATIONS // ============================================================= /** * @dev Returns the starting token ID. * To change the starting token ID, please override this function. */ function _startTokenId() internal view virtual returns (uint256) { return 0; } /** * @dev Returns the next token ID to be minted. */ function _nextTokenId() internal view virtual returns (uint256) { return _currentIndex; } /** * @dev Returns the total number of tokens in existence. * Burned tokens will reduce the count. * To get the total number of tokens minted, please see {_totalMinted}. */ function totalSupply() public view virtual override returns (uint256) { // Counter underflow is impossible as _burnCounter cannot be incremented // more than `_currentIndex - _startTokenId()` times. unchecked { return _currentIndex - _burnCounter - _startTokenId(); } } /** * @dev Returns the total amount of tokens minted in the contract. */ function _totalMinted() internal view virtual returns (uint256) { // Counter underflow is impossible as `_currentIndex` does not decrement, // and it is initialized to `_startTokenId()`. unchecked { return _currentIndex - _startTokenId(); } } /** * @dev Returns the total number of tokens burned. */ function _totalBurned() internal view virtual returns (uint256) { return _burnCounter; } // ============================================================= // ADDRESS DATA OPERATIONS // ============================================================= /** * @dev Returns the number of tokens in `owner`'s account. */ function balanceOf(address owner) public view virtual override returns (uint256) { if (owner == address(0)) revert BalanceQueryForZeroAddress(); return _packedAddressData[owner] & _BITMASK_ADDRESS_DATA_ENTRY; } /** * Returns the number of tokens minted by `owner`. */ function _numberMinted(address owner) internal view returns (uint256) { return (_packedAddressData[owner] >> _BITPOS_NUMBER_MINTED) & _BITMASK_ADDRESS_DATA_ENTRY; } /** * Returns the number of tokens burned by or on behalf of `owner`. */ function _numberBurned(address owner) internal view returns (uint256) { return (_packedAddressData[owner] >> _BITPOS_NUMBER_BURNED) & _BITMASK_ADDRESS_DATA_ENTRY; } /** * Returns the auxiliary data for `owner`. (e.g. number of whitelist mint slots used). */ function _getAux(address owner) internal view returns (uint64) { return uint64(_packedAddressData[owner] >> _BITPOS_AUX); } /** * Sets the auxiliary data for `owner`. (e.g. number of whitelist mint slots used). * If there are multiple variables, please pack them into a uint64. */ function _setAux(address owner, uint64 aux) internal virtual { uint256 packed = _packedAddressData[owner]; uint256 auxCasted; // Cast `aux` with assembly to avoid redundant masking. assembly { auxCasted := aux } packed = (packed & _BITMASK_AUX_COMPLEMENT) | (auxCasted << _BITPOS_AUX); _packedAddressData[owner] = packed; } // ============================================================= // IERC165 // ============================================================= /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified) * to learn more about how these ids are created. * * This function call must use less than 30000 gas. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { // The interface IDs are constants representing the first 4 bytes // of the XOR of all function selectors in the interface. // See: [ERC165](https://eips.ethereum.org/EIPS/eip-165) // (e.g. `bytes4(i.functionA.selector ^ i.functionB.selector ^ ...)`) return interfaceId == 0x01ffc9a7 || // ERC165 interface ID for ERC165. interfaceId == 0x80ac58cd || // ERC165 interface ID for ERC721. interfaceId == 0x5b5e139f; // ERC165 interface ID for ERC721Metadata. } // ============================================================= // IERC721Metadata // ============================================================= /** * @dev Returns the token collection name. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the token collection symbol. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { if (!_exists(tokenId)) revert URIQueryForNonexistentToken(); string memory baseURI = _baseURI(); return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, _toString(tokenId))) : ''; } /** * @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, it can be overridden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ''; } // ============================================================= // OWNERSHIPS OPERATIONS // ============================================================= /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { return address(uint160(_packedOwnershipOf(tokenId))); } /** * @dev Gas spent here starts off proportional to the maximum mint batch size. * It gradually moves to O(1) as tokens get transferred around over time. */ function _ownershipOf(uint256 tokenId) internal view virtual returns (TokenOwnership memory) { return _unpackedOwnership(_packedOwnershipOf(tokenId)); } /** * @dev Returns the unpacked `TokenOwnership` struct at `index`. */ function _ownershipAt(uint256 index) internal view virtual returns (TokenOwnership memory) { return _unpackedOwnership(_packedOwnerships[index]); } /** * @dev Initializes the ownership slot minted at `index` for efficiency purposes. */ function _initializeOwnershipAt(uint256 index) internal virtual { if (_packedOwnerships[index] == 0) { _packedOwnerships[index] = _packedOwnershipOf(index); } } /** * Returns the packed ownership data of `tokenId`. */ function _packedOwnershipOf(uint256 tokenId) private view returns (uint256) { uint256 curr = tokenId; unchecked { if (_startTokenId() <= curr) if (curr < _currentIndex) { uint256 packed = _packedOwnerships[curr]; // If not burned. if (packed & _BITMASK_BURNED == 0) { // Invariant: // There will always be an initialized ownership slot // (i.e. `ownership.addr != address(0) && ownership.burned == false`) // before an unintialized ownership slot // (i.e. `ownership.addr == address(0) && ownership.burned == false`) // Hence, `curr` will not underflow. // // We can directly compare the packed value. // If the address is zero, packed will be zero. while (packed == 0) { packed = _packedOwnerships[--curr]; } return packed; } } } revert OwnerQueryForNonexistentToken(); } /** * @dev Returns the unpacked `TokenOwnership` struct from `packed`. */ function _unpackedOwnership(uint256 packed) private pure returns (TokenOwnership memory ownership) { ownership.addr = address(uint160(packed)); ownership.startTimestamp = uint64(packed >> _BITPOS_START_TIMESTAMP); ownership.burned = packed & _BITMASK_BURNED != 0; ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA); } /** * @dev Packs ownership data into a single uint256. */ function _packOwnershipData(address owner, uint256 flags) private view returns (uint256 result) { assembly { // Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean. owner := and(owner, _BITMASK_ADDRESS) // `owner | (block.timestamp << _BITPOS_START_TIMESTAMP) | flags`. result := or(owner, or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags)) } } /** * @dev Returns the `nextInitialized` flag set if `quantity` equals 1. */ function _nextInitializedFlag(uint256 quantity) private pure returns (uint256 result) { // For branchless setting of the `nextInitialized` flag. assembly { // `(quantity == 1) << _BITPOS_NEXT_INITIALIZED`. result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1)) } } // ============================================================= // APPROVAL OPERATIONS // ============================================================= /** * @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) public virtual override { address owner = ownerOf(tokenId); if (_msgSenderERC721A() != owner) if (!isApprovedForAll(owner, _msgSenderERC721A())) { revert ApprovalCallerNotOwnerNorApproved(); } _tokenApprovals[tokenId].value = to; emit Approval(owner, to, tokenId); } /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken(); return _tokenApprovals[tokenId].value; } /** * @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) public virtual override { if (operator == _msgSenderERC721A()) revert ApproveToCaller(); _operatorApprovals[_msgSenderERC721A()][operator] = approved; emit ApprovalForAll(_msgSenderERC721A(), operator, approved); } /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @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. See {_mint}. */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _startTokenId() <= tokenId && tokenId < _currentIndex && // If within bounds, _packedOwnerships[tokenId] & _BITMASK_BURNED == 0; // and not burned. } /** * @dev Returns whether `msgSender` is equal to `approvedAddress` or `owner`. */ function _isSenderApprovedOrOwner( address approvedAddress, address owner, address msgSender ) private pure returns (bool result) { assembly { // Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean. owner := and(owner, _BITMASK_ADDRESS) // Mask `msgSender` to the lower 160 bits, in case the upper bits somehow aren't clean. msgSender := and(msgSender, _BITMASK_ADDRESS) // `msgSender == owner || msgSender == approvedAddress`. result := or(eq(msgSender, owner), eq(msgSender, approvedAddress)) } } /** * @dev Returns the storage slot and value for the approved address of `tokenId`. */ function _getApprovedSlotAndAddress(uint256 tokenId) private view returns (uint256 approvedAddressSlot, address approvedAddress) { TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId]; // The following is equivalent to `approvedAddress = _tokenApprovals[tokenId]`. assembly { approvedAddressSlot := tokenApproval.slot approvedAddress := sload(approvedAddressSlot) } } // ============================================================= // TRANSFER OPERATIONS // ============================================================= /** * @dev Transfers `tokenId` from `from` to `to`. * * 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 ) public virtual override { uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId); if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner(); (uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId); // The nested ifs save around 20+ gas over a compound boolean condition. if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A())) if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved(); if (to == address(0)) revert TransferToZeroAddress(); _beforeTokenTransfers(from, to, tokenId, 1); // Clear approvals from the previous owner. assembly { if approvedAddress { // This is equivalent to `delete _tokenApprovals[tokenId]`. sstore(approvedAddressSlot, 0) } } // Underflow of the sender's balance is impossible because we check for // ownership above and the recipient's balance can't realistically overflow. // Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256. unchecked { // We can directly increment and decrement the balances. --_packedAddressData[from]; // Updates: `balance -= 1`. ++_packedAddressData[to]; // Updates: `balance += 1`. // Updates: // - `address` to the next owner. // - `startTimestamp` to the timestamp of transfering. // - `burned` to `false`. // - `nextInitialized` to `true`. _packedOwnerships[tokenId] = _packOwnershipData( to, _BITMASK_NEXT_INITIALIZED | _nextExtraData(from, to, prevOwnershipPacked) ); // If the next slot may not have been initialized (i.e. `nextInitialized == false`) . if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) { uint256 nextTokenId = tokenId + 1; // If the next slot's address is zero and not burned (i.e. packed value is zero). if (_packedOwnerships[nextTokenId] == 0) { // If the next slot is within bounds. if (nextTokenId != _currentIndex) { // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`. _packedOwnerships[nextTokenId] = prevOwnershipPacked; } } } } emit Transfer(from, to, tokenId); _afterTokenTransfers(from, to, tokenId, 1); } /** * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ''); } /** * @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 memory _data ) public virtual override { transferFrom(from, to, tokenId); if (to.code.length != 0) if (!_checkContractOnERC721Received(from, to, tokenId, _data)) { revert TransferToNonERC721ReceiverImplementer(); } } /** * @dev Hook that is called before a set of serially-ordered token IDs * are about to be transferred. This includes minting. * And also called before burning one token. * * `startTokenId` - the first token ID to be transferred. * `quantity` - the amount to be transferred. * * 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, `tokenId` will be burned by `from`. * - `from` and `to` are never both zero. */ function _beforeTokenTransfers( address from, address to, uint256 startTokenId, uint256 quantity ) internal virtual {} /** * @dev Hook that is called after a set of serially-ordered token IDs * have been transferred. This includes minting. * And also called after one token has been burned. * * `startTokenId` - the first token ID to be transferred. * `quantity` - the amount to be transferred. * * Calling conditions: * * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been * transferred to `to`. * - When `from` is zero, `tokenId` has been minted for `to`. * - When `to` is zero, `tokenId` has been burned by `from`. * - `from` and `to` are never both zero. */ function _afterTokenTransfers( address from, address to, uint256 startTokenId, uint256 quantity ) internal virtual {} /** * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target contract. * * `from` - Previous owner of the given token ID. * `to` - Target address that will receive the token. * `tokenId` - Token ID to be transferred. * `_data` - Optional data to send along with the call. * * Returns whether the call correctly returned the expected magic value. */ function _checkContractOnERC721Received( address from, address to, uint256 tokenId, bytes memory _data ) private returns (bool) { try ERC721A__IERC721Receiver(to).onERC721Received(_msgSenderERC721A(), from, tokenId, _data) returns ( bytes4 retval ) { return retval == ERC721A__IERC721Receiver(to).onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert TransferToNonERC721ReceiverImplementer(); } else { assembly { revert(add(32, reason), mload(reason)) } } } } // ============================================================= // MINT OPERATIONS // ============================================================= /** * @dev Mints `quantity` tokens and transfers them to `to`. * * Requirements: * * - `to` cannot be the zero address. * - `quantity` must be greater than 0. * * Emits a {Transfer} event for each mint. */ function _mint(address to, uint256 quantity) internal virtual { uint256 startTokenId = _currentIndex; if (quantity == 0) revert MintZeroQuantity(); _beforeTokenTransfers(address(0), to, startTokenId, quantity); // Overflows are incredibly unrealistic. // `balance` and `numberMinted` have a maximum limit of 2**64. // `tokenId` has a maximum limit of 2**256. unchecked { // Updates: // - `balance += quantity`. // - `numberMinted += quantity`. // // We can directly add to the `balance` and `numberMinted`. _packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1); // Updates: // - `address` to the owner. // - `startTimestamp` to the timestamp of minting. // - `burned` to `false`. // - `nextInitialized` to `quantity == 1`. _packedOwnerships[startTokenId] = _packOwnershipData( to, _nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0) ); uint256 toMasked; uint256 end = startTokenId + quantity; // Use assembly to loop and emit the `Transfer` event for gas savings. assembly { // Mask `to` to the lower 160 bits, in case the upper bits somehow aren't clean. toMasked := and(to, _BITMASK_ADDRESS) // Emit the `Transfer` event. log4( 0, // Start of data (0, since no data). 0, // End of data (0, since no data). _TRANSFER_EVENT_SIGNATURE, // Signature. 0, // `address(0)`. toMasked, // `to`. startTokenId // `tokenId`. ) for { let tokenId := add(startTokenId, 1) } iszero(eq(tokenId, end)) { tokenId := add(tokenId, 1) } { // Emit the `Transfer` event. Similar to above. log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId) } } if (toMasked == 0) revert MintToZeroAddress(); _currentIndex = end; } _afterTokenTransfers(address(0), to, startTokenId, quantity); } /** * @dev Mints `quantity` tokens and transfers them to `to`. * * This function is intended for efficient minting only during contract creation. * * It emits only one {ConsecutiveTransfer} as defined in * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309), * instead of a sequence of {Transfer} event(s). * * Calling this function outside of contract creation WILL make your contract * non-compliant with the ERC721 standard. * For full ERC721 compliance, substituting ERC721 {Transfer} event(s) with the ERC2309 * {ConsecutiveTransfer} event is only permissible during contract creation. * * Requirements: * * - `to` cannot be the zero address. * - `quantity` must be greater than 0. * * Emits a {ConsecutiveTransfer} event. */ function _mintERC2309(address to, uint256 quantity) internal virtual { uint256 startTokenId = _currentIndex; if (to == address(0)) revert MintToZeroAddress(); if (quantity == 0) revert MintZeroQuantity(); if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT) revert MintERC2309QuantityExceedsLimit(); _beforeTokenTransfers(address(0), to, startTokenId, quantity); // Overflows are unrealistic due to the above check for `quantity` to be below the limit. unchecked { // Updates: // - `balance += quantity`. // - `numberMinted += quantity`. // // We can directly add to the `balance` and `numberMinted`. _packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1); // Updates: // - `address` to the owner. // - `startTimestamp` to the timestamp of minting. // - `burned` to `false`. // - `nextInitialized` to `quantity == 1`. _packedOwnerships[startTokenId] = _packOwnershipData( to, _nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0) ); emit ConsecutiveTransfer(startTokenId, startTokenId + quantity - 1, address(0), to); _currentIndex = startTokenId + quantity; } _afterTokenTransfers(address(0), to, startTokenId, quantity); } /** * @dev Safely mints `quantity` tokens and transfers them to `to`. * * Requirements: * * - If `to` refers to a smart contract, it must implement * {IERC721Receiver-onERC721Received}, which is called for each safe transfer. * - `quantity` must be greater than 0. * * See {_mint}. * * Emits a {Transfer} event for each mint. */ function _safeMint( address to, uint256 quantity, bytes memory _data ) internal virtual { _mint(to, quantity); unchecked { if (to.code.length != 0) { uint256 end = _currentIndex; uint256 index = end - quantity; do { if (!_checkContractOnERC721Received(address(0), to, index++, _data)) { revert TransferToNonERC721ReceiverImplementer(); } } while (index < end); // Reentrancy protection. if (_currentIndex != end) revert(); } } } /** * @dev Equivalent to `_safeMint(to, quantity, '')`. */ function _safeMint(address to, uint256 quantity) internal virtual { _safeMint(to, quantity, ''); } // ============================================================= // BURN OPERATIONS // ============================================================= /** * @dev Equivalent to `_burn(tokenId, false)`. */ function _burn(uint256 tokenId) internal virtual { _burn(tokenId, false); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId, bool approvalCheck) internal virtual { uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId); address from = address(uint160(prevOwnershipPacked)); (uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId); if (approvalCheck) { // The nested ifs save around 20+ gas over a compound boolean condition. if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A())) if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved(); } _beforeTokenTransfers(from, address(0), tokenId, 1); // Clear approvals from the previous owner. assembly { if approvedAddress { // This is equivalent to `delete _tokenApprovals[tokenId]`. sstore(approvedAddressSlot, 0) } } // Underflow of the sender's balance is impossible because we check for // ownership above and the recipient's balance can't realistically overflow. // Counter overflow is incredibly unrealistic as `tokenId` would have to be 2**256. unchecked { // Updates: // - `balance -= 1`. // - `numberBurned += 1`. // // We can directly decrement the balance, and increment the number burned. // This is equivalent to `packed -= 1; packed += 1 << _BITPOS_NUMBER_BURNED;`. _packedAddressData[from] += (1 << _BITPOS_NUMBER_BURNED) - 1; // Updates: // - `address` to the last owner. // - `startTimestamp` to the timestamp of burning. // - `burned` to `true`. // - `nextInitialized` to `true`. _packedOwnerships[tokenId] = _packOwnershipData( from, (_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) | _nextExtraData(from, address(0), prevOwnershipPacked) ); // If the next slot may not have been initialized (i.e. `nextInitialized == false`) . if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) { uint256 nextTokenId = tokenId + 1; // If the next slot's address is zero and not burned (i.e. packed value is zero). if (_packedOwnerships[nextTokenId] == 0) { // If the next slot is within bounds. if (nextTokenId != _currentIndex) { // Initialize the next slot to maintain correctness for `ownerOf(tokenId + 1)`. _packedOwnerships[nextTokenId] = prevOwnershipPacked; } } } } emit Transfer(from, address(0), tokenId); _afterTokenTransfers(from, address(0), tokenId, 1); // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times. unchecked { _burnCounter++; } } // ============================================================= // EXTRA DATA OPERATIONS // ============================================================= /** * @dev Directly sets the extra data for the ownership data `index`. */ function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual { uint256 packed = _packedOwnerships[index]; if (packed == 0) revert OwnershipNotInitializedForExtraData(); uint256 extraDataCasted; // Cast `extraData` with assembly to avoid redundant masking. assembly { extraDataCasted := extraData } packed = (packed & _BITMASK_EXTRA_DATA_COMPLEMENT) | (extraDataCasted << _BITPOS_EXTRA_DATA); _packedOwnerships[index] = packed; } /** * @dev Called during each token transfer to set the 24bit `extraData` field. * Intended to be overridden by the cosumer contract. * * `previousExtraData` - the value of `extraData` before transfer. * * 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, `tokenId` will be burned by `from`. * - `from` and `to` are never both zero. */ function _extraData( address from, address to, uint24 previousExtraData ) internal view virtual returns (uint24) {} /** * @dev Returns the next extra data for the packed ownership data. * The returned result is shifted into position. */ function _nextExtraData( address from, address to, uint256 prevOwnershipPacked ) private view returns (uint256) { uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA); return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA; } // ============================================================= // OTHER OPERATIONS // ============================================================= /** * @dev Returns the message sender (defaults to `msg.sender`). * * If you are writing GSN compatible contracts, you need to override this function. */ function _msgSenderERC721A() internal view virtual returns (address) { return msg.sender; } /** * @dev Converts a uint256 to its ASCII string decimal representation. */ function _toString(uint256 value) internal pure virtual returns (string memory ptr) { assembly { // The maximum value of a uint256 contains 78 digits (1 byte per digit), // but we allocate 128 bytes to keep the free memory pointer 32-byte word aliged. // We will need 1 32-byte word to store the length, // and 3 32-byte words to store a maximum of 78 digits. Total: 32 + 3 * 32 = 128. ptr := add(mload(0x40), 128) // Update the free memory pointer to allocate. mstore(0x40, ptr) // Cache the end of the memory to calculate the length later. let end := ptr // We write the string from the rightmost digit to the leftmost digit. // The following is essentially a do-while loop that also handles the zero case. // Costs a bit more than early returning for the zero case, // but cheaper in terms of deployment and overall runtime costs. for { // Initialize and perform the first pass without check. let temp := value // Move the pointer 1 byte leftwards to point to an empty character slot. ptr := sub(ptr, 1) // Write the character to the pointer. // The ASCII index of the '0' character is 48. mstore8(ptr, add(48, mod(temp, 10))) temp := div(temp, 10) } temp { // Keep dividing `temp` until zero. temp := div(temp, 10) } { // Body of the for loop. ptr := sub(ptr, 1) mstore8(ptr, add(48, mod(temp, 10))) } let length := sub(end, ptr) // Move the pointer 32 bytes leftwards to make room for the length. ptr := sub(ptr, 32) // Store the length. mstore(ptr, length) } } }
// SPDX-License-Identifier: MIT // ERC721A Contracts v4.2.0 // Creator: Chiru Labs pragma solidity ^0.8.4; /** * @dev Interface of ERC721A. */ interface IERC721A { /** * The caller must own the token or be an approved operator. */ error ApprovalCallerNotOwnerNorApproved(); /** * The token does not exist. */ error ApprovalQueryForNonexistentToken(); /** * The caller cannot approve to their own address. */ error ApproveToCaller(); /** * Cannot query the balance for the zero address. */ error BalanceQueryForZeroAddress(); /** * Cannot mint to the zero address. */ error MintToZeroAddress(); /** * The quantity of tokens minted must be more than zero. */ error MintZeroQuantity(); /** * The token does not exist. */ error OwnerQueryForNonexistentToken(); /** * The caller must own the token or be an approved operator. */ error TransferCallerNotOwnerNorApproved(); /** * The token must be owned by `from`. */ error TransferFromIncorrectOwner(); /** * Cannot safely transfer to a contract that does not implement the * ERC721Receiver interface. */ error TransferToNonERC721ReceiverImplementer(); /** * Cannot transfer to the zero address. */ error TransferToZeroAddress(); /** * The token does not exist. */ error URIQueryForNonexistentToken(); /** * The `quantity` minted with ERC2309 exceeds the safety limit. */ error MintERC2309QuantityExceedsLimit(); /** * The `extraData` cannot be set on an unintialized ownership slot. */ error OwnershipNotInitializedForExtraData(); // ============================================================= // STRUCTS // ============================================================= struct TokenOwnership { // The address of the owner. address addr; // Stores the start time of ownership with minimal overhead for tokenomics. uint64 startTimestamp; // Whether the token has been burned. bool burned; // Arbitrary data similar to `startTimestamp` that can be set via {_extraData}. uint24 extraData; } // ============================================================= // TOKEN COUNTERS // ============================================================= /** * @dev Returns the total number of tokens in existence. * Burned tokens will reduce the count. * To get the total number of tokens minted, please see {_totalMinted}. */ function totalSupply() external view returns (uint256); // ============================================================= // IERC165 // ============================================================= /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified) * to learn more about how these ids are created. * * This function call must use less than 30000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); // ============================================================= // IERC721 // ============================================================= /** * @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, bytes calldata data ) external; /** * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` 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 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 the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @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); // ============================================================= // IERC721Metadata // ============================================================= /** * @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); // ============================================================= // IERC2309 // ============================================================= /** * @dev Emitted when tokens in `fromTokenId` to `toTokenId` * (inclusive) is transferred from `from` to `to`, as defined in the * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309) standard. * * See {_mintERC2309} for more details. */ event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed from, address indexed to); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) 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; } }
{ "optimizer": { "enabled": true, "runs": 1000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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IERC721A.TokenOwnership","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"}],"name":"explicitOwnershipsOf","outputs":[{"components":[{"internalType":"address","name":"addr","type":"address"},{"internalType":"uint64","name":"startTimestamp","type":"uint64"},{"internalType":"bool","name":"burned","type":"bool"},{"internalType":"uint24","name":"extraData","type":"uint24"}],"internalType":"struct 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NotDitto.Chains","name":"morphChain","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"tokensOfOwner","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"start","type":"uint256"},{"internalType":"uint256","name":"stop","type":"uint256"}],"name":"tokensOfOwnerIn","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"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":"uint32","name":"_tokenId","type":"uint32"}],"name":"unmorph","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_tokenId","type":"uint32"}],"name":"unmorphSol","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001f68747470733a2f2f6e6f74646974746f2e78797a2f6170692f746f6b656e2f00
-----Decoded View---------------
Arg [0] : _baseTokenURI (string): https://notditto.xyz/api/token/
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [1] : 000000000000000000000000000000000000000000000000000000000000001f
Arg [2] : 68747470733a2f2f6e6f74646974746f2e78797a2f6170692f746f6b656e2f00
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