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Gas: 1 Gwei

Contract

0xB45D21DC0c1cf275F790B668c3ae09Ac5677B740
 

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From
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Set Approval For...202389392024-07-05 7:53:4743 hrs ago1720166027IN
TheCryptomasksProject: MASK Token
0 ETH0.0008212917.80324195
Transfer From201713352024-06-25 21:18:5911 days ago1719350339IN
TheCryptomasksProject: MASK Token
0 ETH0.000446367.74017374
Set Approval For...201470852024-06-22 11:56:2314 days ago1719057383IN
TheCryptomasksProject: MASK Token
0 ETH0.000152713.30442815
Set Approval For...201058992024-06-16 17:39:2320 days ago1718559563IN
TheCryptomasksProject: MASK Token
0 ETH0.000101434.1880112
Transfer From200969862024-06-15 11:46:4721 days ago1718452007IN
TheCryptomasksProject: MASK Token
0 ETH0.000218773.79276193
Safe Transfer Fr...200920492024-06-14 19:10:2322 days ago1718392223IN
TheCryptomasksProject: MASK Token
0 ETH0.0006619510.93837092
Set Approval For...200170182024-06-04 7:38:4732 days ago1717486727IN
TheCryptomasksProject: MASK Token
0 ETH0.000134285.54448525
Set Approval For...200028022024-06-02 7:59:5934 days ago1717315199IN
TheCryptomasksProject: MASK Token
0 ETH0.000234685.08735156
Set Approval For...199885072024-05-31 8:04:4736 days ago1717142687IN
TheCryptomasksProject: MASK Token
0 ETH0.000318716.9087043
Set Approval For...199633502024-05-27 19:39:5940 days ago1716838799IN
TheCryptomasksProject: MASK Token
0 ETH0.0012455627
Set Approval For...199613052024-05-27 12:47:1140 days ago1716814031IN
TheCryptomasksProject: MASK Token
0 ETH0.0006603414.31423539
Set Approval For...199599062024-05-27 8:06:2340 days ago1716797183IN
TheCryptomasksProject: MASK Token
0 ETH0.000438219.48196923
Safe Transfer Fr...199546082024-05-26 14:20:5941 days ago1716733259IN
TheCryptomasksProject: MASK Token
0 ETH0.00044327.25459934
Set Approval For...198321832024-05-09 11:27:3558 days ago1715254055IN
TheCryptomasksProject: MASK Token
0 ETH0.000180343.90226419
Set Approval For...198320852024-05-09 11:07:4758 days ago1715252867IN
TheCryptomasksProject: MASK Token
0 ETH0.000197524.28180635
Set Approval For...198095992024-05-06 7:37:5961 days ago1714981079IN
TheCryptomasksProject: MASK Token
0 ETH0.000255625.54125209
Set Approval For...197854612024-05-02 22:38:1165 days ago1714689491IN
TheCryptomasksProject: MASK Token
0 ETH0.000117374.84127533
Set Approval For...197850012024-05-02 21:05:1165 days ago1714683911IN
TheCryptomasksProject: MASK Token
0 ETH0.000299586.49407986
Set Approval For...197751552024-05-01 12:03:3566 days ago1714565015IN
TheCryptomasksProject: MASK Token
0 ETH0.000456229.87153768
Set Approval For...197684342024-04-30 13:30:4767 days ago1714483847IN
TheCryptomasksProject: MASK Token
0 ETH0.0008808519.06443452
Set Approval For...197364862024-04-26 2:13:5972 days ago1714097639IN
TheCryptomasksProject: MASK Token
0 ETH0.000251145.44396392
Safe Transfer Fr...197103252024-04-22 10:25:2375 days ago1713781523IN
TheCryptomasksProject: MASK Token
0 ETH0.000522448
Set Approval For...197093892024-04-22 7:17:1175 days ago1713770231IN
TheCryptomasksProject: MASK Token
0 ETH0.000336127.27287774
Safe Transfer Fr...197093272024-04-22 7:04:3575 days ago1713769475IN
TheCryptomasksProject: MASK Token
0 ETH0.000547349.04452044
Safe Transfer Fr...197003492024-04-21 0:57:2377 days ago1713661043IN
TheCryptomasksProject: MASK Token
0 ETH0.000377786.24257758
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TheCryptomasksProject: MASK Token
14.25 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
TheCryptomasksProject

Compiler Version
v0.8.13+commit.abaa5c0e

Optimization Enabled:
Yes with 555 runs

Other Settings:
default evmVersion
File 1 of 14 : TheCryptomasksProject.sol
// SPDX-License-Identifier: MIT

// The Cryptomasks Project
// author: sadat.eth

pragma solidity ^0.8.12;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/interfaces/IERC2981.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";

contract TheCryptomasksProject is ERC721, IERC2981, ReentrancyGuard, Ownable {
    using Strings for uint256;

    // Sale status
    bool private phase1 = false;
    bool private phase2 = false;
    bool private phase3 = false;
    bool public paused = true;

    // Sale configuration
    uint256 public priceCommon = 0.02 ether;
    uint256 public priceRare = 0.04 ether;
    uint256 public priceEpic = 0.06 ether;
    uint256 public priceLegendary = 0.12 ether;
    uint256 public priceMythic = 0.25 ether;
    uint256 public pricePublicSale = 0.03 ether;
    
    // Token allocation 
    uint256 public maxSupply = 555;
    uint256 private mythicCounter = 1;
    uint256 private legendaryCounter = 5;
    uint256 private epicCounter = 30;
    uint256 private rareCounter = 115;
    uint256 private commonCounter = 270;
    
    // Marketplace configuration
    string public baseURI = "ipfs://Qmbpnw4zHg3XvhPz2QyUuHPMWgxfT3SstQUv9Z1bEgmTS8/";
    string private collectionURI = "ipfs://QmQwYkbVj7TcamQa3NsuGvFVpEGTKWks8RPkSm19sEktVS/";
    address private proxyAddr = 0xa5409ec958C83C3f309868babACA7c86DCB077c1;

    // Funds distribution
    address private projectWallet;
    address private royaltyReceiver;
    uint256 private royaltyPercentBps;
    
    // Sale records
    bytes32 private whitelist;
    uint256 private limit = 5;
    mapping(address => bool) public claimed;
    mapping(address => bool) public minted;
    mapping(address => uint256) public mints;
    mapping(address => bool) private partners;

    constructor() ERC721("TheCryptomasksProject", "MASK") {}

    // Custom functions public

    function claim(uint256 rank, bytes32[] calldata proof) public payable canMint() {
        require(phase1, "phase 1 not started");
        require(!claimed[msg.sender], "already claimed");
        require(_verify(_leaf(msg.sender, rank), proof), "invalid proof");
        uint256 tokenId = _getTokenId(rank);
        _mint(msg.sender, tokenId);
        _updateCounter(tokenId);
        claimed[msg.sender] = true;
    }

    function presaleMint(uint256 rank, bytes32[] calldata proof) public payable canMint() {
        require(phase2, "phase 2 not started");
        require(!minted[msg.sender], "already minted");
        require(_verify(_leaf(msg.sender, rank), proof), "invalid proof");
        uint256 tokenId = _getTokenId(rank);
        require(msg.value >= getPrice(tokenId), "funds n/a");
        _mint(msg.sender, tokenId);
        _updateCounter(tokenId);
        minted[msg.sender] = true;
    }

    function publicMint() public payable canMint() {
        require(phase3, "phase 3 not started");
        require(mints[msg.sender] < limit, "minted max");
        uint256 tokenId = _getTokenIdRandom();
        require(msg.value >= pricePublicSale, "funds n/a");
        _mint(msg.sender, tokenId);
        _updateCounter(tokenId);
        mints[msg.sender] += 1;

    }

    function getPrice(uint256 rank) public view returns (uint256 priceIs) {
        if (rank == 1) { return priceMythic; }
        if (rank == 2) { return priceLegendary; }
        if (rank == 3) { return priceEpic; }
        if (rank == 4) { return priceRare; }
        if (rank == 5) { return priceCommon; }
    }

    function getSaleStatus() public view returns (uint256 phaseIs) {
        if (phase1) { return 1; }
        if (phase2) { return 2; }
        if (phase3) { return 3; }
        else { return 0; }
    }

    // Custom functions internal

    modifier canMint() {
        require(tx.origin == msg.sender, "humans only");
        require(!paused, "contract paused");
        require(totalSupply() < maxSupply, "sold out");
        _;
    }

    function _getTokenId(uint256 rank) internal virtual returns (uint256 newToken) {
        require(0 < rank && rank < 6, "ranks are 1-5");
        if (rank == 1) {
            require(mythicCounter < 5, "supply n/a");
            return mythicCounter;
        }
        if (rank == 2) {
            require(legendaryCounter < 30, "supply n/a");
            return legendaryCounter;
        }
        if (rank == 3) {
            require(epicCounter < 115, "supply n/a");
            return epicCounter;
        }
        if (rank == 4) {
            require(rareCounter < 270, "supply n/a");
            return rareCounter;
        }
        if (rank == 5) {
            require(commonCounter < 555, "supply n/a");
            return commonCounter;
        }
    }

    function _random() internal view returns (uint256) {
        uint256 randomnumber = uint256(keccak256(abi.encodePacked(
            block.timestamp,
            msg.sender,
            totalSupply()
            ))) % 5;
            randomnumber = randomnumber + 1;
        return randomnumber;
    }

    function _getTokenIdRandom() internal view returns (uint256 newToken) {
        uint256 luck = _random();

        if (luck == 5) {
            if (mythicCounter < 5) { return mythicCounter; }
            if (legendaryCounter < 30) { return legendaryCounter; }
            if (epicCounter < 115) { return epicCounter; }
            if (rareCounter < 270) { return rareCounter; }
            if (commonCounter < 555) { return commonCounter; }
        }
        else if (luck == 4) {
            if (legendaryCounter < 30) { return legendaryCounter; }
            if (epicCounter < 115) { return epicCounter; }
            if (rareCounter < 270) { return rareCounter; }
            if (commonCounter < 555) { return commonCounter; }
            if (mythicCounter < 5) { return mythicCounter; }
        }
        else if (luck == 3) {
            if (epicCounter < 115) { return epicCounter; }
            if (rareCounter < 270) { return rareCounter; }
            if (commonCounter < 555) { return commonCounter; }
            if (mythicCounter < 5) { return mythicCounter; }
            if (legendaryCounter < 30) { return legendaryCounter; }
        }
        else if (luck == 2) {
            if (rareCounter < 270) { return rareCounter; }
            if (epicCounter < 115) { return epicCounter; }
            if (legendaryCounter < 30) { return legendaryCounter; }
            if (mythicCounter < 5) { return mythicCounter; }
            if (commonCounter < 555) { return commonCounter; }
        }
        else if (luck == 1) {
            if (commonCounter < 555) { return commonCounter; }
            if (rareCounter < 270) { return rareCounter; }
            if (epicCounter < 115) { return epicCounter; }
            if (legendaryCounter < 30) { return legendaryCounter; }
            if (mythicCounter < 5) { return mythicCounter; }
        }
    }

    function _updateCounter(uint256 tokenId) internal virtual {
        if (0 < tokenId && tokenId < 5) { mythicCounter++; }
        if (4 < tokenId && tokenId < 30) { legendaryCounter++; }
        if (29 < tokenId && tokenId < 115) { epicCounter++; }
        if (114 < tokenId && tokenId < 270) { rareCounter++; }
        if (269 < tokenId && tokenId < 556) { commonCounter++; }
    }

    function _leaf(address account, uint256 rank) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(account, rank));
    }

    function _verify(bytes32 _leafNode, bytes32[] memory proof) internal view returns (bool) {
        return MerkleProof.verify(proof, whitelist, _leafNode);
    }

    // Custom functions owner

    function airdropRandom(address[] memory _addresses) public payable onlyOwner canMint() {
        require(_addresses.length + totalSupply() < maxSupply, "supply n/a");
        for (uint256 i; i < _addresses.length; i++) {
            uint256 tokenId = _getTokenIdRandom();
            _mint(_addresses[i], tokenId);
            _updateCounter(tokenId);
        }
    }

    function airdrop(address[] memory _addresses, uint256 rank) public payable onlyOwner canMint() {
        require(0 < rank && rank < 6, "ranks are 1-5");
        if (rank == 1) {
            require(_addresses.length + mythicCounter < 5, "supply n/a");
            for (uint256 i; i < _addresses.length; i++) {
                _mint(_addresses[i], mythicCounter);
                mythicCounter++;
            }
        }
        if (rank == 2) {
            require(_addresses.length + legendaryCounter < 30, "supply n/a");
            for (uint256 i; i < _addresses.length; i++) {
                _mint(_addresses[i], legendaryCounter);
                legendaryCounter++;
            }
        }
        if (rank == 3) {
            require(_addresses.length + epicCounter < 115, "supply n/a");
            for (uint256 i; i < _addresses.length; i++) {
                _mint(_addresses[i], epicCounter);
                epicCounter++;
            }
        }
        if (rank == 4) {
            require(_addresses.length + rareCounter < 270, "supply n/a");
            for (uint256 i; i < _addresses.length; i++) {
                _mint(_addresses[i], rareCounter);
                rareCounter++;
            }
        }
        if (rank == 5) {
            require(_addresses.length + commonCounter < 555, "supply n/a");
            for (uint256 i; i < _addresses.length; i++) {
                _mint(_addresses[i], commonCounter);
                commonCounter++;
            }
        }
    }

    function giveaway(address wallet, uint256 rank) public payable onlyOwner canMint() {
        require(wallet != address(0), "invalid address");
        require(0 < rank && rank < 6, "ranks are 1-5");
        if (rank == 1) {
            require(mythicCounter < 5, "supply n/a");
            _mint(wallet, mythicCounter);
            mythicCounter++;
        }
        if (rank == 2) {
            require(legendaryCounter < 30, "supply n/a");
            _mint(wallet, legendaryCounter);
            legendaryCounter++;
        }
        if (rank == 3) {
            require(epicCounter < 115, "supply n/a");
            _mint(wallet, epicCounter);
            epicCounter++;
        }
        if (rank == 4) {
            require(rareCounter < 270, "supply n/a");
            _mint(wallet, rareCounter);
            rareCounter++;
        }
        if (rank == 5) {
            require(commonCounter < 555, "supply n/a");
            _mint(wallet, commonCounter);
            commonCounter++;
        }
    }

    function setWhitelist(bytes32 whitelistRoot) public onlyOwner {
        whitelist = whitelistRoot;
    }

    function setPresaleConfig(uint256 _common, uint256 _rare, uint256 _epic, uint256 _legend, uint256 _mythic) public onlyOwner {
        priceCommon = _common;
        priceRare = _rare;
        priceEpic = _epic;
        priceLegendary = _legend;
        priceMythic = _mythic;
    }

    function setPublicSaleConfig(uint256 _publicPrice, uint256 _limitPerWallet) public onlyOwner {
        pricePublicSale = _publicPrice;
        limit = _limitPerWallet;
    }

    function setCollectionURI(string memory _collectionURI) public onlyOwner {
        collectionURI = _collectionURI;
    }

    function setOpenseaProxy(address _proxyAddr) public onlyOwner {
        proxyAddr = _proxyAddr;
    }

    function setPartner(address _partnerAddr) public onlyOwner {
        partners[_partnerAddr] = !partners[_partnerAddr];
    }

    function setPaused() public onlyOwner {
        paused = !paused;
    }

    function startPhase1() public onlyOwner {
        phase1 = true;
        phase2 = false;
        phase3 = false;
    }

    function startPhase2() public onlyOwner {
        phase1 = false;
        phase2 = true;
        phase3 = false;
    }

    function startPhase3() public onlyOwner {
        phase1 = false;
        phase2 = false;
        phase3 = true;
    }

    function setBaseURI(string memory _baseURI) public onlyOwner {
        baseURI = _baseURI;
    }

    function setRoyalty(address _royaltyReceiver, uint256 _percentBPs) public onlyOwner {
        royaltyReceiver = _royaltyReceiver;
        royaltyPercentBps = _percentBPs;
    }

    function setProjectWallet(address _projectWallet) public onlyOwner {
        projectWallet = _projectWallet;
    }

    function withdrawETH() public onlyOwner nonReentrant {
        require(projectWallet != address(0), "no wallet found");
        (bool success, ) = payable(projectWallet).call{value: address(this).balance}("");
        require(success, "withdraw failed");
    }

    // Standard functions marketplaces

    function isApprovedForAll(address owner, address operator) public override view returns (bool) {
        OpenSeaProxyRegistry proxyRegistry = OpenSeaProxyRegistry(proxyAddr);
        if (address(proxyRegistry.proxies(owner)) == operator || partners[operator]) return true;
        return super.isApprovedForAll(owner, operator);
    }

    function royaltyInfo(uint256 _tokenId, uint256 _salePrice) external view returns (address receiver, uint256 royaltyAmount) {
        require(_exists(_tokenId), "Cannot query non-existent token");
        return (royaltyReceiver, (_salePrice * royaltyPercentBps) / 10000);
    }

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, IERC165) returns (bool) {
        return (interfaceId == type(IERC2981).interfaceId || super.supportsInterface(interfaceId));
    }

    function contractURI() public view returns (string memory) {
        return collectionURI;
    }

    function tokenURI(uint256 _tokenId) public view override returns (string memory) {
        require(_exists(_tokenId), "Token does not exist.");
        return string(abi.encodePacked(baseURI, Strings.toString(_tokenId)));
    }

    function totalSupply() public view returns (uint256) {
        // Since our distribution is complex
        uint256 m = mythicCounter - 1;
        uint256 l = legendaryCounter - 5;
        uint256 e = epicCounter - 30;
        uint256 r = rareCounter - 115;
        uint256 c = commonCounter - 270;
        uint256 totalMinted = m + l + e + r + c;
        return totalMinted;
    }

    function walletOfOwner(address _address) public virtual view returns (uint256[] memory) {
        uint256 _balance = balanceOf(_address);
        uint256[] memory _tokens = new uint256[] (_balance);
        uint256 _index;
        uint256 _loop = totalSupply();
        for (uint256 i = 0; i < _loop; i++) {
            bool _exists = _exists(i);
            if (_exists) {
                if (ownerOf(i) == _address) { _tokens[_index] = i; _index++; }
            }
            else if (!_exists && _tokens[_balance -1] == 0) { _loop++; }
        }
        return _tokens;
    }
}

contract OwnableDelegateProxy { }

contract OpenSeaProxyRegistry {
    mapping(address => OwnableDelegateProxy) public proxies;
}

File 2 of 14 : MerkleProof.sol
// 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)
        }
    }
}

File 3 of 14 : Ownable.sol
// 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);
    }
}

File 4 of 14 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 5 of 14 : IERC2981.sol
// 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);
}

File 6 of 14 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 7 of 14 : ERC165.sol
// 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;
    }
}

File 8 of 14 : Strings.sol
// 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);
    }
}

File 9 of 14 : Context.sol
// 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;
    }
}

File 10 of 14 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 11 of 14 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 12 of 14 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 13 of 14 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * 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);
}

File 14 of 14 : IERC165.sol
// 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);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 555
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

The Cryptomasks Project is a collection of 555 randomly generated NFTs on the Ethereum blockchain created by [The Cryptomath](https://twitter.com/TheCryptomath).Each Cryptomasks is uniquely generated from 24 different rarity traits hand-drawn by [8th Project](https://opensea.io/8thproject).

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.