ERC-721
Overview
Max Total Supply
5,000 MOODFLIPPERS
Holders
2,430
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
0 MOODFLIPPERSLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|
Contract Name:
MoodFlippers
Compiler Version
v0.8.9+commit.e5eed63a
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.9; /** :+*****+- :+*****+- -%+: .=%==%+: .=%+ *#. *#. *% :@. +@@%: . =@@@- %= -@ *@@@: *@@@+ #+ %+ . -+ .:. -@. .#*: .+%##: .+%: :-==++++++++++++++++#@%*+++*%@%++#@%*+++*%@%++++++++++++++++==-:. .=*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#=. -#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%= -%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@- *@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@# #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@# +@@@@@@@@@@@@@@@@@@@@@@@@@@@@+==#@@@@@@@@@@@@@@@@@@@@@@@@*=-+@@@@@@@@@@@@@@@@@@@@@@@@@@* @@@@@@@@@@@@@@@@@@@@@@@@@@@@. *@@@@@@@@@@@@@@@@@@@@@@+ :@@@@@@@@@@@@@@@@@@@@@@@@@@. :@@@@@@@@@@@@@@@@@@@@@@@@@@@@- #@@@@@@@@@@@@@@@@@@@@# +@@@@@@@@@@@@@@@@@@@@@@@@@@- -@@@@@@@@@@@@@@@@@@@@@@@@@@@@@: =@@@@@@@@@@@@@@@@@@+ -@@@@@@@@@@@@@@@@@@@@@@@@@@@- -@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@+ -*@@@@@@@@@@@@%+. =@@@@@@@@@@@@@@@@@@@@@@@@@@@@- .@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%- .-=+++++=: :#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@: %@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%=. -#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@% :@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%+-. :=*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@- -@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%#####%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@= :%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%: =%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@= -*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*- :=*#@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%*=: XXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXX */ import "erc721a/contracts/ERC721A.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol"; import "@openzeppelin/contracts/utils/Strings.sol"; import "@openzeppelin/contracts/token/common/ERC2981.sol"; contract MoodFlippers is ERC721A, ERC2981, Ownable { using Strings for uint256; error ContractMintDisallowedError(); error EarlyAccessClosedError(); error ExceedsMaxSupplyError(); error IncorrectAmountError(); error InsufficientEarlyAccessSpotsError(); error InvalidProofError(); error PublicSaleClosedError(); string public PROVENANCE_HASH; uint256 constant MAX_SUPPLY = 5000; enum SaleState { Closed, Stage1, Stage2, Public } SaleState public saleState = SaleState.Closed; mapping(SaleState => uint256) private _prices; address payable public beneficiary; bytes32 public merkleRoot; mapping(address => uint256) private _earlyAccessSpotsUsed; string public baseURI; string private _contractURI; constructor( address payable _beneficiary, address payable royaltiesReceiver, string memory _initialBaseURI, string memory _initialContractURI ) ERC721A("Mood Flippers", "MOODFLIPPERS") { _prices[SaleState.Stage1] = 0.075 ether; _prices[SaleState.Stage2] = 0.12 ether; _prices[SaleState.Public] = 0.16 ether; beneficiary = _beneficiary; setRoyaltyInfo(royaltiesReceiver, 500); baseURI = _initialBaseURI; _contractURI = _initialContractURI; } // Accessors function setProvenanceHash(string calldata hash) public onlyOwner { PROVENANCE_HASH = hash; } function setSaleState(SaleState _saleState) public onlyOwner { saleState = _saleState; } function setMerkleRoot(bytes32 _merkleRoot) public onlyOwner { merkleRoot = _merkleRoot; } function setBeneficiary(address payable _beneficiary) public onlyOwner { beneficiary = _beneficiary; } function earlyAccessSpotsUsed(address addr) public view returns (uint256) { return _earlyAccessSpotsUsed[addr]; } // Metadata function setBaseURI(string calldata uri) public onlyOwner { baseURI = uri; } function setContractURI(string calldata uri) public onlyOwner { _contractURI = uri; } function _baseURI() internal view override returns (string memory) { return baseURI; } function contractURI() public view returns (string memory) { return _contractURI; } // Minting function mintListed( uint256 amount, bytes32[] calldata merkleProof, uint256 maxAmount ) public payable { if (saleState != SaleState.Stage1 && saleState != SaleState.Stage2) revert EarlyAccessClosedError(); if (amount > maxAmount - _earlyAccessSpotsUsed[msg.sender]) revert InsufficientEarlyAccessSpotsError(); if (msg.value != _prices[saleState] * amount) revert IncorrectAmountError(); if (!_verify(merkleProof, msg.sender, maxAmount)) revert InvalidProofError(); _earlyAccessSpotsUsed[msg.sender] += amount; _internalMint(msg.sender, amount); } function mintPublic(uint256 amount) public payable { if (saleState != SaleState.Public) revert PublicSaleClosedError(); if (msg.value != _prices[saleState] * amount) revert IncorrectAmountError(); if (msg.sender != tx.origin) revert ContractMintDisallowedError(); _internalMint(msg.sender, amount); } function ownerMint(address to, uint256 amount) public onlyOwner { _internalMint(to, amount); } function withdraw() public onlyOwner { beneficiary.transfer(address(this).balance); } // Private function _internalMint(address to, uint256 amount) private { if (totalSupply() + amount > MAX_SUPPLY) revert ExceedsMaxSupplyError(); _mint(to, amount); } function _verify( bytes32[] calldata merkleProof, address sender, uint256 maxAmount ) private view returns (bool) { bytes32 leaf = keccak256(abi.encodePacked(sender, maxAmount.toString())); return MerkleProof.verify(merkleProof, merkleRoot, leaf); } // ERC721A function _startTokenId() internal view virtual override returns (uint256) { return 1; } // IERC2981 function setRoyaltyInfo(address payable receiver, uint96 numerator) public onlyOwner { _setDefaultRoyalty(receiver, numerator); } // ERC165 function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721A, ERC2981) returns (bool) { return ERC721A.supportsInterface(interfaceId) || ERC2981.supportsInterface(interfaceId); } }
// SPDX-License-Identifier: MIT // ERC721A Contracts v4.0.0 // Creator: Chiru Labs pragma solidity ^0.8.4; import './IERC721A.sol'; /** * @dev ERC721 token receiver interface. */ interface ERC721A__IERC721Receiver { function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); } /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension. Built to optimize for lower gas during batch mints. * * Assumes serials are sequentially minted starting at _startTokenId() (defaults to 0, e.g. 0, 1, 2, 3..). * * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply. * * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256). */ contract ERC721A is IERC721A { // 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 tokenId of the next token 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` 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 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; _currentIndex = _startTokenId(); } /** * @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 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 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 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 returns (uint256) { return _burnCounter; } /** * @dev See {IERC165-supportsInterface}. */ 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: 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. } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view 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 auxillary 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 auxillary 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 { uint256 packed = _packedAddressData[owner]; uint256 auxCasted; assembly { // Cast aux without masking. auxCasted := aux } packed = (packed & BITMASK_AUX_COMPLEMENT) | (auxCasted << BITPOS_AUX); _packedAddressData[owner] = packed; } /** * 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 ownership that has an address and is not burned // before an ownership that does not have an address and is not burned. // Hence, curr will not underflow. // // We can directly compare the packed value. // If the address is zero, packed is zero. while (packed == 0) { packed = _packedOwnerships[--curr]; } return packed; } } } revert OwnerQueryForNonexistentToken(); } /** * 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; } /** * Returns the unpacked `TokenOwnership` struct at `index`. */ function _ownershipAt(uint256 index) internal view returns (TokenOwnership memory) { return _unpackedOwnership(_packedOwnerships[index]); } /** * @dev Initializes the ownership slot minted at `index` for efficiency purposes. */ function _initializeOwnershipAt(uint256 index) internal { if (_packedOwnerships[index] == 0) { _packedOwnerships[index] = _packedOwnershipOf(index); } } /** * Gas spent here starts off proportional to the maximum mint batch size. * It gradually moves to O(1) as tokens get transferred around in the collection over time. */ function _ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) { return _unpackedOwnership(_packedOwnershipOf(tokenId)); } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view override returns (address) { return address(uint160(_packedOwnershipOf(tokenId))); } /** * @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) { 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, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ''; } /** * @dev Casts the address to uint256 without masking. */ function _addressToUint256(address value) private pure returns (uint256 result) { assembly { result := value } } /** * @dev Casts the boolean to uint256 without branching. */ function _boolToUint256(bool value) private pure returns (uint256 result) { assembly { result := value } } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public override { address owner = address(uint160(_packedOwnershipOf(tokenId))); if (to == owner) revert ApprovalToCurrentOwner(); if (_msgSenderERC721A() != owner) if (!isApprovedForAll(owner, _msgSenderERC721A())) { revert ApprovalCallerNotOwnerNorApproved(); } _tokenApprovals[tokenId] = to; emit Approval(owner, to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view override returns (address) { if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken(); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { if (operator == _msgSenderERC721A()) revert ApproveToCaller(); _operatorApprovals[_msgSenderERC721A()][operator] = approved; emit ApprovalForAll(_msgSenderERC721A(), 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 { _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 { _transfer(from, to, tokenId); if (to.code.length != 0) if (!_checkContractOnERC721Received(from, to, tokenId, _data)) { revert TransferToNonERC721ReceiverImplementer(); } } /** * @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`), */ function _exists(uint256 tokenId) internal view returns (bool) { return _startTokenId() <= tokenId && tokenId < _currentIndex && // If within bounds, _packedOwnerships[tokenId] & BITMASK_BURNED == 0; // and not burned. } /** * @dev Equivalent to `_safeMint(to, quantity, '')`. */ function _safeMint(address to, uint256 quantity) internal { _safeMint(to, 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. * * Emits a {Transfer} event. */ function _safeMint( address to, uint256 quantity, bytes memory _data ) internal { uint256 startTokenId = _currentIndex; if (to == address(0)) revert MintToZeroAddress(); if (quantity == 0) revert MintZeroQuantity(); _beforeTokenTransfers(address(0), to, startTokenId, quantity); // Overflows are incredibly unrealistic. // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1 // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1 unchecked { // Updates: // - `balance += quantity`. // - `numberMinted += quantity`. // // We can directly add to the balance and number minted. _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] = _addressToUint256(to) | (block.timestamp << BITPOS_START_TIMESTAMP) | (_boolToUint256(quantity == 1) << BITPOS_NEXT_INITIALIZED); uint256 updatedIndex = startTokenId; uint256 end = updatedIndex + quantity; if (to.code.length != 0) { do { emit Transfer(address(0), to, updatedIndex); if (!_checkContractOnERC721Received(address(0), to, updatedIndex++, _data)) { revert TransferToNonERC721ReceiverImplementer(); } } while (updatedIndex < end); // Reentrancy protection if (_currentIndex != startTokenId) revert(); } else { do { emit Transfer(address(0), to, updatedIndex++); } while (updatedIndex < end); } _currentIndex = updatedIndex; } _afterTokenTransfers(address(0), to, startTokenId, quantity); } /** * @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. */ function _mint(address to, uint256 quantity) internal { uint256 startTokenId = _currentIndex; if (to == address(0)) revert MintToZeroAddress(); if (quantity == 0) revert MintZeroQuantity(); _beforeTokenTransfers(address(0), to, startTokenId, quantity); // Overflows are incredibly unrealistic. // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1 // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1 unchecked { // Updates: // - `balance += quantity`. // - `numberMinted += quantity`. // // We can directly add to the balance and number minted. _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] = _addressToUint256(to) | (block.timestamp << BITPOS_START_TIMESTAMP) | (_boolToUint256(quantity == 1) << BITPOS_NEXT_INITIALIZED); uint256 updatedIndex = startTokenId; uint256 end = updatedIndex + quantity; do { emit Transfer(address(0), to, updatedIndex++); } while (updatedIndex < end); _currentIndex = updatedIndex; } _afterTokenTransfers(address(0), to, startTokenId, quantity); } /** * @dev Transfers `tokenId` from `from` to `to`. * * 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 ) private { uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId); if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner(); bool isApprovedOrOwner = (_msgSenderERC721A() == from || isApprovedForAll(from, _msgSenderERC721A()) || getApproved(tokenId) == _msgSenderERC721A()); if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved(); if (to == address(0)) revert TransferToZeroAddress(); _beforeTokenTransfers(from, to, tokenId, 1); // Clear approvals from the previous owner. delete _tokenApprovals[tokenId]; // 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] = _addressToUint256(to) | (block.timestamp << BITPOS_START_TIMESTAMP) | BITMASK_NEXT_INITIALIZED; // 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 `_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)); if (approvalCheck) { bool isApprovedOrOwner = (_msgSenderERC721A() == from || isApprovedForAll(from, _msgSenderERC721A()) || getApproved(tokenId) == _msgSenderERC721A()); if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved(); } _beforeTokenTransfers(from, address(0), tokenId, 1); // Clear approvals from the previous owner. delete _tokenApprovals[tokenId]; // 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] = _addressToUint256(from) | (block.timestamp << BITPOS_START_TIMESTAMP) | BITMASK_BURNED | BITMASK_NEXT_INITIALIZED; // 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++; } } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target 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 _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)) } } } } /** * @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 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 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. 48 is the ASCII index of '0'. 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 // 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 (last updated v4.6.0) (utils/cryptography/MerkleProof.sol) pragma solidity ^0.8.0; /** * @dev These functions deal with verification of Merkle Trees proofs. * * The proofs can be generated using the JavaScript library * https://github.com/miguelmota/merkletreejs[merkletreejs]. * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled. * * See `test/utils/cryptography/MerkleProof.test.js` for some examples. * * WARNING: You should avoid using leaf values that are 64 bytes long prior to * hashing, or use a hash function other than keccak256 for hashing leaves. * This is because the concatenation of a sorted pair of internal nodes in * the merkle tree could be reinterpreted as a leaf value. */ library MerkleProof { /** * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree * defined by `root`. For this, a `proof` must be provided, containing * sibling hashes on the branch from the leaf to the root of the tree. Each * pair of leaves and each pair of pre-images are assumed to be sorted. */ function verify( bytes32[] memory proof, bytes32 root, bytes32 leaf ) internal pure returns (bool) { return processProof(proof, leaf) == root; } /** * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt * hash matches the root of the tree. When processing the proof, the pairs * of leafs & pre-images are assumed to be sorted. * * _Available since v4.4._ */ function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { bytes32 proofElement = proof[i]; if (computedHash <= proofElement) { // Hash(current computed hash + current element of the proof) computedHash = _efficientHash(computedHash, proofElement); } else { // Hash(current element of the proof + current computed hash) computedHash = _efficientHash(proofElement, computedHash); } } return computedHash; } function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) { assembly { mstore(0x00, a) mstore(0x20, b) value := keccak256(0x00, 0x40) } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) 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 // OpenZeppelin Contracts (last updated v4.6.0) (token/common/ERC2981.sol) pragma solidity ^0.8.0; import "../../interfaces/IERC2981.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information. * * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first. * * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the * fee is specified in basis points by default. * * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported. * * _Available since v4.5._ */ abstract contract ERC2981 is IERC2981, ERC165 { struct RoyaltyInfo { address receiver; uint96 royaltyFraction; } RoyaltyInfo private _defaultRoyaltyInfo; mapping(uint256 => RoyaltyInfo) private _tokenRoyaltyInfo; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC165) returns (bool) { return interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId); } /** * @inheritdoc IERC2981 */ function royaltyInfo(uint256 _tokenId, uint256 _salePrice) public view virtual override returns (address, uint256) { RoyaltyInfo memory royalty = _tokenRoyaltyInfo[_tokenId]; if (royalty.receiver == address(0)) { royalty = _defaultRoyaltyInfo; } uint256 royaltyAmount = (_salePrice * royalty.royaltyFraction) / _feeDenominator(); return (royalty.receiver, royaltyAmount); } /** * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an * override. */ function _feeDenominator() internal pure virtual returns (uint96) { return 10000; } /** * @dev Sets the royalty information that all ids in this contract will default to. * * Requirements: * * - `receiver` cannot be the zero address. * - `feeNumerator` cannot be greater than the fee denominator. */ function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual { require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice"); require(receiver != address(0), "ERC2981: invalid receiver"); _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator); } /** * @dev Removes default royalty information. */ function _deleteDefaultRoyalty() internal virtual { delete _defaultRoyaltyInfo; } /** * @dev Sets the royalty information for a specific token id, overriding the global default. * * Requirements: * * - `tokenId` must be already minted. * - `receiver` cannot be the zero address. * - `feeNumerator` cannot be greater than the fee denominator. */ function _setTokenRoyalty( uint256 tokenId, address receiver, uint96 feeNumerator ) internal virtual { require(feeNumerator <= _feeDenominator(), "ERC2981: royalty fee will exceed salePrice"); require(receiver != address(0), "ERC2981: Invalid parameters"); _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator); } /** * @dev Resets royalty information for the token id back to the global default. */ function _resetTokenRoyalty(uint256 tokenId) internal virtual { delete _tokenRoyaltyInfo[tokenId]; } }
// SPDX-License-Identifier: MIT // ERC721A Contracts v4.0.0 // Creator: Chiru Labs pragma solidity ^0.8.4; /** * @dev Interface of an ERC721A compliant contract. */ 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(); /** * The caller cannot approve to the current owner. */ error ApprovalToCurrentOwner(); /** * 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(); struct TokenOwnership { // The address of the owner. address addr; // Keeps track of the start time of ownership with minimal overhead for tokenomics. uint64 startTimestamp; // Whether the token has been burned. bool burned; } /** * @dev Returns the total amount of tokens stored by the contract. * * Burned tokens are calculated here, use `_totalMinted()` if you want to count just minted tokens. */ function totalSupply() external view returns (uint256); // ============================== // 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); // ============================== // 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`. * * 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; /** * @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 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); }
// 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; } }
// 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 (utils/introspection/ERC165.sol) 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 // 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); }
{ "optimizer": { "enabled": false, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : _beneficiary (address): 0xc8313AC324DA8AD99d3887FEd0c4fFfE9d41e813
Arg [1] : royaltiesReceiver (address): 0x5D684ce6Bb74543ffD83af2b7b66681Ec8558459
Arg [2] : _initialBaseURI (string): https://moodflippers.com/api/metadata/
Arg [3] : _initialContractURI (string): https://moodflippers.com/api/metadata/MoodFlippers
-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 000000000000000000000000c8313ac324da8ad99d3887fed0c4fffe9d41e813
Arg [1] : 0000000000000000000000005d684ce6bb74543ffd83af2b7b66681ec8558459
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000026
Arg [5] : 68747470733a2f2f6d6f6f64666c6970706572732e636f6d2f6170692f6d6574
Arg [6] : 61646174612f0000000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000032
Arg [8] : 68747470733a2f2f6d6f6f64666c6970706572732e636f6d2f6170692f6d6574
Arg [9] : 61646174612f4d6f6f64466c6970706572730000000000000000000000000000
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