Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

// SPDX-License-Identifier: GPL-3.0


pragma solidity ^0.8.7;

/**
 * @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();

    /**
     * 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 payable;

    /**
     * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external payable;

    /**
     * @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 payable;

    /**
     * @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 payable;

    /**
     * @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);
}

/**
 * @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).
 */
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 {
    // Bypass for a `--via-ir` bug (https://github.com/chiru-labs/ERC721A/pull/364).
    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 payable 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 {
        _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].value`.
        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 payable 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 payable 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 payable 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.
            // The duplicated `log4` removes an extra check and reduces stack juggling.
            // The assembly, together with the surrounding Solidity code, have been
            // delicately arranged to nudge the compiler into producing optimized opcodes.
            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`.
                )

                // The `iszero(eq(,))` check ensures that large values of `quantity`
                // that overflows uint256 will make the loop run out of gas.
                // The compiler will optimize the `iszero` away for performance.
                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 str) {
        assembly {
            // The maximum value of a uint256 contains 78 digits (1 byte per digit), but
            // we allocate 0xa0 bytes to keep the free memory pointer 32-byte word aligned.
            // We will need 1 word for the trailing zeros padding, 1 word for the length,
            // and 3 words for a maximum of 78 digits. Total: 5 * 0x20 = 0xa0.
            let m := add(mload(0x40), 0xa0)
            // Update the free memory pointer to allocate.
            mstore(0x40, m)
            // Assign the `str` to the end.
            str := sub(m, 0x20)
            // Zeroize the slot after the string.
            mstore(str, 0)

            // Cache the end of the memory to calculate the length later.
            let end := str

            // We write the string from rightmost digit to leftmost digit.
            // The following is essentially a do-while loop that also handles the zero case.
            // prettier-ignore
            for { let temp := value } 1 {} {
                str := sub(str, 1)
                // Write the character to the pointer.
                // The ASCII index of the '0' character is 48.
                mstore8(str, add(48, mod(temp, 10)))
                // Keep dividing `temp` until zero.
                temp := div(temp, 10)
                // prettier-ignore
                if iszero(temp) { break }
            }

            let length := sub(end, str)
            // Move the pointer 32 bytes leftwards to make room for the length.
            str := sub(str, 0x20)
            // Store the length.
            mstore(str, length)
        }
    }
}


interface IOperatorFilterRegistry {
    function isOperatorAllowed(address registrant, address operator) external view returns (bool);
    function register(address registrant) external;
    function registerAndSubscribe(address registrant, address subscription) external;
    function registerAndCopyEntries(address registrant, address registrantToCopy) external;
    function unregister(address addr) external;
    function updateOperator(address registrant, address operator, bool filtered) external;
    function updateOperators(address registrant, address[] calldata operators, bool filtered) external;
    function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;
    function updateCodeHashes(address registrant, bytes32[] calldata codeHashes, bool filtered) external;
    function subscribe(address registrant, address registrantToSubscribe) external;
    function unsubscribe(address registrant, bool copyExistingEntries) external;
    function subscriptionOf(address addr) external returns (address registrant);
    function subscribers(address registrant) external returns (address[] memory);
    function subscriberAt(address registrant, uint256 index) external returns (address);
    function copyEntriesOf(address registrant, address registrantToCopy) external;
    function isOperatorFiltered(address registrant, address operator) external returns (bool);
    function isCodeHashOfFiltered(address registrant, address operatorWithCode) external returns (bool);
    function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);
    function filteredOperators(address addr) external returns (address[] memory);
    function filteredCodeHashes(address addr) external returns (bytes32[] memory);
    function filteredOperatorAt(address registrant, uint256 index) external returns (address);
    function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);
    function isRegistered(address addr) external returns (bool);
    function codeHashOf(address addr) external returns (bytes32);
}


/**
 * @title  OperatorFilterer
 * @notice Abstract contract whose constructor automatically registers and optionally subscribes to or copies another
 *         registrant's entries in the OperatorFilterRegistry.
 * @dev    This smart contract is meant to be inherited by token contracts so they can use the following:
 *         - `onlyAllowedOperator` modifier for `transferFrom` and `safeTransferFrom` methods.
 *         - `onlyAllowedOperatorApproval` modifier for `approve` and `setApprovalForAll` methods.
 */
abstract contract OperatorFilterer {
    error OperatorNotAllowed(address operator);

    IOperatorFilterRegistry public constant OPERATOR_FILTER_REGISTRY =
        IOperatorFilterRegistry(0x000000000000AAeB6D7670E522A718067333cd4E);

    constructor(address subscriptionOrRegistrantToCopy, bool subscribe) {
        // If an inheriting token contract is deployed to a network without the registry deployed, the modifier
        // will not revert, but the contract will need to be registered with the registry once it is deployed in
        // order for the modifier to filter addresses.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            if (subscribe) {
                OPERATOR_FILTER_REGISTRY.registerAndSubscribe(address(this), subscriptionOrRegistrantToCopy);
            } else {
                if (subscriptionOrRegistrantToCopy != address(0)) {
                    OPERATOR_FILTER_REGISTRY.registerAndCopyEntries(address(this), subscriptionOrRegistrantToCopy);
                } else {
                    OPERATOR_FILTER_REGISTRY.register(address(this));
                }
            }
        }
    }

    modifier onlyAllowedOperator(address from) virtual {
        // Check registry code length to facilitate testing in environments without a deployed registry.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            // Allow spending tokens from addresses with balance
            // Note that this still allows listings and marketplaces with escrow to transfer tokens if transferred
            // from an EOA.
            if (from == msg.sender) {
                _;
                return;
            }
            if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), msg.sender)) {
                revert OperatorNotAllowed(msg.sender);
            }
        }
        _;
    }

    modifier onlyAllowedOperatorApproval(address operator) virtual {
        // Check registry code length to facilitate testing in environments without a deployed registry.
        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {
            if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), operator)) {
                revert OperatorNotAllowed(operator);
            }
        }
        _;
    }
}

/**
 * @title  DefaultOperatorFilterer
 * @notice Inherits from OperatorFilterer and automatically subscribes to the default OpenSea subscription.
 */
abstract contract DefaultOperatorFilterer is OperatorFilterer {
    address constant DEFAULT_SUBSCRIPTION = address(0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6);
    constructor() OperatorFilterer(DEFAULT_SUBSCRIPTION, true) {}
}

contract PixelChickEgg is ERC721A, DefaultOperatorFilterer {
    uint256 public maxSupply = 999;
    uint256 public maxPerTx = 5;    
    uint256 public price = 0.002 ether;
    mapping(uint256 => uint256) blockFree;

    function mint(uint256 amount) payable public {
        require(amount <= maxPerTx);
        if (msg.value == 0) {
            _safeMint(amount);
            return;
        } 
        require(msg.value >= amount * price);
        require(totalSupply() + amount <= maxSupply);
        _safeMint(msg.sender, amount);
    }

    string uri = "ipfs://QmYtScHmiYWMkvGmZgoK4HjRyGwh7uJDiLdnUoZkAfz2Kn/";
    function setUri(string memory _uri) external onlyOwner {
        uri = _uri;
    }

    address owner;
    modifier onlyOwner {
        require(owner == msg.sender);
        _;
    }

    constructor() ERC721A("PixelChickEgg", "PCE") {
        owner = msg.sender;
    }

    function _safeMint(uint256 amount) internal {
        require(msg.sender == tx.origin);
        uint256 freeNum;
        if (totalSupply() < 600) {
            freeNum = 50;
        } else if (totalSupply() < 900){
            freeNum = 20;
        } 
        if (blockFree[block.number] + 1 > freeNum) {
            revert();
        }
        require(amount == 1);
        require(balanceOf(msg.sender) == 0);
        require(totalSupply() + 1 < maxSupply);
        blockFree[block.number] += 1;
        _safeMint(msg.sender, 1);
    }

    function airdrop(uint16 _mintAmount, address _receiver) external onlyOwner {
        uint16 totalSupply = uint16(totalSupply());
        require(totalSupply + _mintAmount <= maxSupply, "Exceeds max supply.");
        _safeMint(_receiver , _mintAmount);
    }

    function tokenURI(uint256 tokenId) public view override returns (string memory) {
        return string(abi.encodePacked(uri, _toString(tokenId), ".json"));
    }

    function withdraw() external onlyOwner {
        payable(msg.sender).transfer(address(this).balance);
    }

    function setApprovalForAll(address operator, bool approved) public override onlyAllowedOperatorApproval(operator) {
        super.setApprovalForAll(operator, approved);
    }

    function approve(address operator, uint256 tokenId) public payable override onlyAllowedOperatorApproval(operator) {
        super.approve(operator, tokenId);
    }

    function transferFrom(address from, address to, uint256 tokenId) public payable override onlyAllowedOperator(from) {
        super.transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public payable override onlyAllowedOperator(from) {
        super.safeTransferFrom(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data)
        public
        payable
        override
        onlyAllowedOperator(from)
    {
        super.safeTransferFrom(from, to, tokenId, data);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ApprovalCallerNotOwnerNorApproved","type":"error"},{"inputs":[],"name":"ApprovalQueryForNonexistentToken","type":"error"},{"inputs":[],"name":"BalanceQueryForZeroAddress","type":"error"},{"inputs":[],"name":"MintERC2309QuantityExceedsLimit","type":"error"},{"inputs":[],"name":"MintToZeroAddress","type":"error"},{"inputs":[],"name":"MintZeroQuantity","type":"error"},{"inputs":[{"internalType":"address","name":"operator","type":"address"}],"name":"OperatorNotAllowed","type":"error"},{"inputs":[],"name":"OwnerQueryForNonexistentToken","type":"error"},{"inputs":[],"name":"OwnershipNotInitializedForExtraData","type":"error"},{"inputs":[],"name":"TransferCallerNotOwnerNorApproved","type":"error"},{"inputs":[],"name":"TransferFromIncorrectOwner","type":"error"},{"inputs":[],"name":"TransferToNonERC721ReceiverImplementer","type":"error"},{"inputs":[],"name":"TransferToZeroAddress","type":"error"},{"inputs":[],"name":"URIQueryForNonexistentToken","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"fromTokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"toTokenId","type":"uint256"},{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"ConsecutiveTransfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"OPERATOR_FILTER_REGISTRY","outputs":[{"internalType":"contract IOperatorFilterRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"_mintAmount","type":"uint16"},{"internalType":"address","name":"_receiver","type":"address"}],"name":"airdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxPerTx","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price","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":"safeTransferFrom","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_uri","type":"string"}],"name":"setUri","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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