Contract 0xB798E45a2B090cfFf44d20178673b438566E1722 2

 
 
Txn Hash
Method
Block
From
To
Value
0x14b209361080964a50c760a6c4a6cf12c797f6deab564a2df3a6459419f584caSafe Transfer Fr...160239872022-11-22 7:13:475 days 12 hrs ago0x68adf76d674e278cc7fdfc5648d54e36302bcc4d IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00046812 11.51759949
0xf40c739d13ed15f403b9ef6dea4a7135f4151c6df49d9f460d3fcef57a8b5efeSet Approval For...160122942022-11-20 16:03:237 days 3 hrs agoENS Name cryptogordongekko.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00076242 16.50842513
0x73860c4069b338d30ce192ec9b3b458e9068a1edba8b34e7123000ad6436a0c9Set Approval For...159949912022-11-18 6:05:239 days 13 hrs ago0x50fa08c981cb70e2cdc5a031617675a790f5cdf5 IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00059175 12.81300535
0x4bad77b67d2494726cfa5302d63eabebb8b845efc41e1d172336cb29e82b532dSafe Transfer Fr...159589612022-11-13 5:18:1114 days 14 hrs agoENS Name klentslogan.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00052146 12.82994687
0xa007049b32213749bfb8e96446ca82919bcb284b8116b56e7baab48912ef8f24Set Approval For...159069042022-11-05 22:49:4721 days 20 hrs ago0x2f6ae53bad3afe554a0ae52b69b4e335acb0f8eb IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00054875 11.88183374
0x86212ee4459d88e5cfcbcd6407a68b0a86b5c1e03034c22e8fe0df0e43d419c0Safe Transfer Fr...158904882022-11-03 15:48:4724 days 3 hrs ago0x39682c4c221de87e0f20d153b6a8f6ed8e08d1ef IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00108605 26.72105324
0xb85c52cfd8a50db53cfe5178888b188c7b9a8112548bbdcbcc5c25a4a6e5eff6Transfer From158768622022-11-01 18:07:1126 days 1 hr agoENS Name kandle.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00067686 17.8922738
0xafe6389a08822f4f4a4f570472438f2bc39d8965ce1c9d1d489f9f11d5320998Transfer From158281662022-10-25 22:48:2332 days 20 hrs agoENS Name cryptokass.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00072716 19.22202439
0x0b676677c7bf1c9fbb3dbd2a050fae2b86d3f84a7e05b117ce84912e9efb6090Safe Transfer Fr...157989622022-10-21 20:47:3536 days 22 hrs ago0x7d179437fe0fb508a054c1d593c6b6e7f6cceb48 IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00102884 25.3136043
0xb8f24583adcd4e153cb4836ec1efef08f0d1f1b7c0f449b7d3a474bb9241e563Set Approval For...157516702022-10-15 6:17:2343 days 13 hrs ago0xd8af4e148f8a0e703a152afe1842a0010c6f63d7 IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00035557 14.64941011
0x81eb0a5e4db388c340311a8bb4e79e0958e2543a9206a9f1852532e670bf27ecSet Approval For...157344902022-10-12 20:43:3545 days 22 hrs ago0x5c15e2815a7cf1ef8f506a0a4657f98462bbb19b IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00076355 16.53280134
0x5e0233f7c5007acb54980d2be38b24d2763cc47bcc0b559f27817ea63bb3cff3Safe Transfer Fr...157277702022-10-11 22:11:5946 days 21 hrs agoENS Name kelmat.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00119552 29.42314483
0x68989c0e38a76a5bcb0e04c84427444632ced8708cdc28368b088345ec29328bSet Approval For...156917402022-10-06 21:27:2351 days 21 hrs ago0x7d179437fe0fb508a054c1d593c6b6e7f6cceb48 IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00046888 10.15260372
0xe05d58aa994de181830c5347ae2ab1aa043dd564800bdbb4f9b87d382f340126Set Approval For...156905432022-10-06 17:27:1152 days 1 hr agoENS Name canklefark.q00t.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00085382 18.45382385
0x2a0bbf273e590434a261ad2e205596bbb357e286468c62ebcde1b9038a51e754Set Approval For...156905432022-10-06 17:27:1152 days 1 hr agoENS Name canklefark.q00t.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00085227 18.45382385
0x7a9e2da53545be0b4ae4add620c0854b6b5930a2603c31e98cb47594c60e7559Set Approval For...156618402022-10-02 17:04:2356 days 2 hrs agoENS Name artemisgroup.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00025243 5.46588424
0xe6ac496087719ba3c9d1c83d6d80a9a1740e064eb96ea0ad13e21452dae43cacSet Approval For...156590832022-10-02 7:51:4756 days 11 hrs ago0x103fc03c2c7348e434ab226c8c855b3c778ddc9d IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00021605 4.67814665
0xa264fb7cf559700f23c1543729b6d681028df3871d044b9e0b74bb7f2d33dcfcSet Approval For...156581532022-10-02 4:45:1156 days 14 hrs ago0x39a519f0ad74a5a2ae4d8293132d6edcaa808aab IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00022717 4.9189398
0x07d84a9c814959e050eb16da991ecfea84c4de71f2e24c6debda36c74d7031fcSet Approval For...156515822022-10-01 6:41:1157 days 12 hrs ago0xf0de0642380c16c7a341cace6daf4400c481d7bf IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00029492 6.38579181
0x5742e9aa9722f15686c77f8af6f3aefdc5ce376a5c6631401450d2d5afed4697Set Approval For...156252622022-09-27 14:23:1161 days 4 hrs ago0x7581ac51a4198e62369d75ef0f50ddf6e157916b IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00080294 17.38583185
0x883efcdf0925aa189219e2c2fb3cfee2b082e75a8712aac8917d85bc562673b2Safe Transfer Fr...155782002022-09-21 0:16:2367 days 19 hrs ago0xbeab0f031a10c56134c17b1c3efca7c44e6d47c2 IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00048207 11.86101238
0x2cee94010df97ff7b47db99a56a2f27088fe161edec7adf216cfa7cf234b6a97Set Approval For...155212632022-09-12 14:07:5376 days 5 hrs ago0xbd5e6a4e2fdf620f00575116a91b7d0d06903257 IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00153343 33.20281305
0xe81a0bfe6c9a7820fdaf89bfd4e25301807bd620c24f1d3167c2b2b75d27b49dSet Approval For...155200272022-09-12 8:58:2076 days 10 hrs ago0x157a8fde864e9622b9344b6293fa67b414459e5c IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00041469 8.97925724
0x64f999d24447a03da44ac6fafdd3beef5ec21dd7b1a0d0f0c3bea5c00ede3327Set Approval For...155182162022-09-12 1:44:0576 days 17 hrs agoENS Name mcclute.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00031468 6.81372655
0x91b955d0c355b6ad7c4a3fc322d345b0b0564c62e63e886adccadf5ffcaac69eSet Approval For...155079622022-09-10 9:05:5978 days 10 hrs agoENS Name devking.eth IN  0xb798e45a2b090cfff44d20178673b438566e17220 Ether0.00017923 7.3588564
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0x0467f5d8702d9e2b8b0e4c7b7b9ad05ecf6dd530d6ef9d58343fca76a8f1e8d1146390062022-04-23 4:40:02218 days 14 hrs ago 0xb798e45a2b090cfff44d20178673b438566e17220x6e37d65d20ec3842358fb326a03e5e0ca47a0fa511.705 Ether
0xfa0ce486c899a06eb3737fc7dc1dfdbf4887906efdf201e0cc2bf59796fc6b97146379152022-04-23 0:33:52218 days 18 hrs ago 0x747eca7ac49fed246c43c5cbfb0c8a3d70c35b04 0xb798e45a2b090cfff44d20178673b438566e17222.5 Ether
0x8ed5b8a888f1302d9daf9db39a727ba566e369c3dff5ca671fe33ddbde3b8f61146034342022-04-17 14:52:19224 days 4 hrs ago 0xb798e45a2b090cfff44d20178673b438566e17220x6e37d65d20ec3842358fb326a03e5e0ca47a0fa562.995 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
LambDuhsPX

Compiler Version
v0.8.13+commit.abaa5c0e

Optimization Enabled:
Yes with 1000 runs

Other Settings:
default evmVersion
File 1 of 2 : LambDuhsPX.sol
// SPDX-License-Identifier: MIT
//
/*
 *
 *      ||         .-:'"-._
 *     |  |      _(,       )
 *    |    |  ,'O"(         )>
 *     |  |   `-.-(        )
 *      ||        `-._._.-'
 *                 //   //
 *
 * ASTERIA LABS:
 * @Danny_One_
 *
 */

import "./ERC721_efficient.sol";

pragma solidity ^0.8.0;

interface ILambDuh {
    function balanceOf(address sender) external view returns (uint256);
}

contract LambDuhsPX is ERC721Enumerable, Ownable, nonReentrant {
    uint256 public pxPS_Price = 50000000000000000; // 0.050 ETH
    uint256 public pxLambPrice = 55000000000000000; // 0.055 ETH
    uint256 public constant maxPxLambPurchase = 10;
    uint256 public immutable MAX_PXLAMB = 8500; // 8.5k supply
    uint256 public immutable MAX_PRESALE = 6150; // total presale lambs allowed

    //Reserve PX Lamb for team - Giveaways/Prizes etc
    uint256 public immutable MAX_PXLAMBRESERVE = 100; // total team reserves allowed
    uint256 public immutable MAX_PXPORTALS = 1500; // total portal lambs allowed
    uint256 public immutable MAX_FREECLAIM = 20; // total free lambs allowed

    address public tokenDeposit = 0x2a6f3F959eb2cb0982B2dB5D4Cb2aEFb8B3cd4a3; // address to receive custom ERC20

    string public PXprovenance;

    uint256 public maxSaleMint = 10;
    uint256 public teamMints = 0;

    enum SaleState {
        Paused,
        Presale,
        Phase2,
        Open
    }
    SaleState public saleState;

    bytes32 public MerkleRoot =
        0x88e10a1c8b916fcfde160f7ab84e06107f52e258421fc3bf0b7f4d3a3e22c0b1;

    ILambDuh public LambContract =
        ILambDuh(0x1F0f72e6Dc2EA6FDe3A32A1B3fD47A26a3293Dc9);

    struct TPToken {
        uint64 MAX_TOKEN;
        uint64 tokenSupply;
        uint128 Cost;
        IERC20 Contract;
    }

    enum TokenName {
        BAMBOO,
        PIXL,
        ROOLAH,
        SEED,
        STAR,
        LAMEX,
        SPIT,
        ETH
    }

    mapping(TokenName => TPToken) public mintableTokens;

    address public proxyRegistryAddress;

    struct AddressInfo {
        uint64 ownerFreeClaims;
        uint64 ownerPresaleMints;
        bool[7] tokenMinted;
        bool projectProxy;
    }

    mapping(address => AddressInfo) public addressInfo;

    uint16[] public portalsIDs;

    constructor() ERC721("Lamb Duhs PX", "LDPX") {}

    // PUBLIC FUNCTIONS

    function mint(uint256 _mintAmount) public payable reentryLock {
        require(saleState > SaleState.Phase2, "public sale is not active");
        require(msg.sender == tx.origin, "no proxy transactions");

        uint256 supply = totalSupply();
        require(_mintAmount < maxSaleMint + 1, "max transaction exceeded");
        require(supply + _mintAmount < MAX_PXLAMB + 1, "max supply exceeded");

        require(msg.value >= _mintAmount * pxLambPrice, "not enough ETH sent");

        for (uint256 i = 0; i < _mintAmount; i++) {
            _safeMint(msg.sender, supply + i);
        }
    }

    function mintPresale(
        bytes32[] memory _proof,
        bytes2 _maxAmountKey,
        uint256 _mintAmount,
        TokenName _tokenName
    ) public payable reentryLock {
        require(
            MerkleRoot > 0x00 && saleState > SaleState.Paused,
            "presale period not open!"
        );

        uint256 supply = totalSupply();
        require(supply + _mintAmount < MAX_PXLAMB + 1, "max supply exceeded");

        require(
            MerkleProof.verify(
                _proof,
                MerkleRoot,
                keccak256(abi.encodePacked(msg.sender, _maxAmountKey))
            ),
            "invalid  proof-key combo"
        );
        uint8 allowed = uint8(uint16(_maxAmountKey));

        if (_tokenName == TokenName.ETH) {
            require(saleState < SaleState.Open, "presale closed!");
            require(
                msg.value >= _mintAmount * pxPS_Price,
                "not enough ETH sent"
            );
            require(
                mintableTokens[_tokenName].tokenSupply + _mintAmount <
                    MAX_PRESALE + 1,
                "presale sold out"
            );

            if (saleState == SaleState.Presale) {
                require(
                    addressInfo[msg.sender].ownerPresaleMints + _mintAmount <
                        allowed + 1,
                    "max presale claims exceeded"
                );
            } else if (saleState == SaleState.Phase2) {
                require(
                    addressInfo[msg.sender].ownerPresaleMints + _mintAmount <
                        2 * allowed + 1,
                    "max phase 2 claims exceeded"
                );
            }

            mintableTokens[_tokenName].tokenSupply += uint64(_mintAmount);
            addressInfo[msg.sender].ownerPresaleMints += uint64(_mintAmount);
        } else {
            // LAMEX, SPIT
            require(_tokenName > TokenName.STAR, "invalid token");
            require(_mintAmount < 2, "only 1 allowed");
            require(
                addressInfo[msg.sender].tokenMinted[uint256(_tokenName)] ==
                    false,
                "tokenMint already claimed"
            );
            require(
                mintableTokens[_tokenName].tokenSupply <
                    mintableTokens[_tokenName].MAX_TOKEN,
                "max tokenMint exceeded"
            );

            mintableTokens[_tokenName].tokenSupply += uint64(_mintAmount);
            addressInfo[msg.sender].tokenMinted[uint256(_tokenName)] = true;
        }

        for (uint256 i = 0; i < uint256(_mintAmount); i++) {
            _safeMint(msg.sender, supply + i);
        }
    }

    // TokenName: BAMBOO, PIXL, ROOLAH, SEED, STAR
    function mintWithToken(TokenName _tokenName) public reentryLock {
        require(
            MerkleRoot > 0x00 && saleState > SaleState.Paused,
            "token mint not open!"
        );

        uint256 supply = totalSupply();
        require(supply < MAX_PXLAMB, "max supply exceeded");
        require(
            mintableTokens[_tokenName].tokenSupply <
                mintableTokens[_tokenName].MAX_TOKEN,
            "max tokenMint exceeded"
        );
        require(
            addressInfo[msg.sender].tokenMinted[uint256(_tokenName)] == false,
            "tokenMint already claimed"
        );
        require(_tokenName < TokenName.LAMEX, "invalid ERC20");

        bool success = mintableTokens[_tokenName].Contract.transferFrom(
            msg.sender,
            tokenDeposit,
            mintableTokens[_tokenName].Cost
        );
        require(success, "token transfer failed");

        mintableTokens[_tokenName].tokenSupply += 1;
        addressInfo[msg.sender].tokenMinted[uint256(_tokenName)] = true;

        _safeMint(msg.sender, supply);
    }

    function mintFreeClaim(
        bytes32[] memory _proof,
        bytes2 _maxAmountKey,
        uint256 _mintAmount
    ) public reentryLock {
        require(
            MerkleRoot > 0x00 && saleState > SaleState.Paused,
            "free claim period not open!"
        );

        uint256 supply = totalSupply();
        require(supply + _mintAmount < MAX_PXLAMB + 1, "max supply exceeded");
        uint256 portalSupply = supply - portalsIDs.length;
        require(
            portalSupply + _mintAmount < MAX_PXPORTALS + 1,
            "max portals exceeded"
        );

        require(
            MerkleProof.verify(
                _proof,
                MerkleRoot,
                keccak256(abi.encodePacked(msg.sender, _maxAmountKey))
            ),
            "invalid proof-key combo"
        );
        uint8 allowed = uint8(bytes1(_maxAmountKey));
        require(
            addressInfo[msg.sender].ownerFreeClaims + _mintAmount < allowed + 1,
            "max allowed claims exceeded"
        );
        require(
            addressInfo[msg.sender].ownerFreeClaims + _mintAmount <
                MAX_FREECLAIM + 1,
            "max free claims exceeded"
        );
        require(
            LambContract.balanceOf(msg.sender) >=
                3 * (_mintAmount + addressInfo[msg.sender].ownerFreeClaims),
            "insuffient OG Lamb balance"
        );

        addressInfo[msg.sender].ownerFreeClaims += uint64(_mintAmount);
        portalSupply += uint64(_mintAmount);

        for (uint256 i = 0; i < uint256(_mintAmount); i++) {
            portalsIDs.push(uint16(supply + i));
            _safeMint(msg.sender, supply + i);
        }
    }

    function checkProofWithKey(bytes32[] memory proof, bytes memory key)
        public
        view
        returns (bool)
    {
        return
            MerkleProof.verify(
                proof,
                MerkleRoot,
                keccak256(abi.encodePacked(msg.sender, key))
            );
    }

    function isApprovedForAll(address _owner, address operator)
        public
        view
        override(ERC721, IERC721)
        returns (bool)
    {
        MarketplaceProxyRegistry proxyRegistry = MarketplaceProxyRegistry(
            proxyRegistryAddress
        );
        if (
            address(proxyRegistry.proxies(_owner)) == operator ||
            addressInfo[operator].projectProxy
        ) return true;
        return super.isApprovedForAll(_owner, operator);
    }

    function getTokensMinted(address _sender)
        public
        view
        returns (bool[7] memory)
    {
        return addressInfo[_sender].tokenMinted;
    }

    function getPortalsIDs() public view returns (uint16[] memory) {
        return portalsIDs;
    }

    // ONLY OWNER FUNCTIONS

    function setBaseURI(string memory baseURI_) public onlyOwner {
        _setBaseURI(baseURI_);
    }

    function setMerkleRoot(bytes32 _MerkleRoot) public onlyOwner {
        MerkleRoot = _MerkleRoot;
    }

    function setSaleState(SaleState _state) public onlyOwner {
        saleState = _state;
    }

    function setProxyRegistry(address _proxyRegistryAddress) public onlyOwner {
        proxyRegistryAddress = _proxyRegistryAddress;
    }

    function withdraw() public onlyOwner {
        uint256 balance = address(this).balance;
        (bool success, ) = address(0x6e37d65D20Ec3842358fb326A03E5E0ca47A0fa5)
            .call{value: balance}("");
        require(success, "Transfer failed.");
    }

    function setPrice(uint256 _newPrice, uint256 _newPSPrice) public onlyOwner {
        pxLambPrice = _newPrice;
        pxPS_Price = _newPSPrice;
    }

    function setTokenConfig(
        TokenName _token,
        uint64 _MAX_TOKEN,
        uint128 _Cost,
        address _tokenAddress
    ) public onlyOwner {
        if (mintableTokens[_token].tokenSupply > 0) {
            require(
                mintableTokens[_token].tokenSupply >= _MAX_TOKEN,
                "supply already greater than max"
            );
        }
        mintableTokens[_token].MAX_TOKEN = _MAX_TOKEN;
        mintableTokens[_token].Cost = _Cost;
        mintableTokens[_token].Contract = IERC20(_tokenAddress);
    }

    function setLambContract(address _lambOG) external onlyOwner {
        if (address(LambContract) != _lambOG) {
            LambContract = ILambDuh(_lambOG);
        }
    }

    function setTokenDeposit(address _tokenDeposit) public onlyOwner {
        tokenDeposit = _tokenDeposit;
    }

    function setProvenance(string memory _provenance) public onlyOwner {
        PXprovenance = _provenance;
    }

    // reserve function for team mints (giveaways & payments)
    function teamMint(address _to, uint256 _reserveAmount) public onlyOwner {
        require(
            _reserveAmount + teamMints < MAX_PXLAMBRESERVE + 1,
            "Not enough reserve left for team"
        );
        uint256 supply = totalSupply();
        teamMints = teamMints + _reserveAmount;

        for (uint256 i = 0; i < _reserveAmount; i++) {
            _safeMint(_to, supply + i);
        }
    }
}

contract OwnableDelegateProxy {}

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

File 2 of 2 : ERC721_efficient.sol
/**
 * Flattened contract dependencies for ERC721 NFT projects
 * @Danny_One
 *
 *
 * Added Merkle Proof presale list
 * Improved Enumerable per new best practices to save gas
 *
 * Flattened from:
 *	MerkleProof.sol - Nuclear Nerds (2022-01-16)
 *   ERC721Enumerable.sol - Nuclear Nerds (2022-01-04)
 *   IERC721Enumerable.sol - Open Zeppelin (2022-01-04)
 * 	OpenZeppelin (on 2021-11-18):
 *		IERC20.sol (2022-04-13)
 * 		ERC721.sol **significantly modified
 * 		IERC721.sol
 * 		IERC721Receiver.sol
 * 		IERC721Metadata.sol
 * 		Address.sol
 * 		Context.sol
 * 		Ownable.sol
 * 		Strings.sol
 * 		Counters.sol
 * 		ERC165.sol
 * 		IERC165.sol
 * 	nonReentrant (custom)
 *
 **/

// SPDX-License-Identifier: MIT

// OpenZeppelin Contracts v4.4.1 (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.
 */
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 Merklee 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)
        }
    }
}

// OpenZeppelin Contracts v4.3.2 (utils/introspection/IERC165.sol)

/**
 * @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);
}

// OpenZeppelin Contracts v4.3.2 (utils/introspection/ERC165.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;
    }
}

// OpenZeppelin Contracts v4.3.2 (utils/Strings.sol)

/**
 * @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);
    }
}

// OpenZeppelin Contracts v4.3.2 (utils/Context.sol)

/**
 * @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;
    }
}

// OpenZeppelin Contracts v4.3.2 (access/Ownable.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);
    }
}

// OpenZeppelin Contracts v4.3.2 (utils/Address.sol)

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @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);
            }
        }
    }
}

// OpenZeppelin Contracts v4.3.2 (token/ERC721/IERC721.sol)

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

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId)
        external
        view
        returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator)
        external
        view
        returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// OpenZeppelin Contracts v4.3.2 (token/ERC721/extensions/IERC721Metadata.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);
}

// OpenZeppelin Contracts v4.3.2 (token/ERC721/IERC721Receiver.sol)

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

// OpenZeppelin Contracts v4.3.2 (utils/Counters.sol)

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

/**
 * @title nonReentrant module to prevent recursive calling of functions
 * @dev See https://medium.com/coinmonks/protect-your-solidity-smart-contracts-from-reentrancy-attacks-9972c3af7c21
 * part of a flattened ERC721 dependency collection compiled by Danny_One
 */

abstract contract nonReentrant {
    bool private _reentryKey = false;
    modifier reentryLock() {
        require(!_reentryKey, "cannot reenter a locked function");
        _reentryKey = true;
        _;
        _reentryKey = false;
    }
}

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// OpenZeppelin Contracts v4.3.2 (token/ERC721/ERC721.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}.
 *
 * Modified from original OpenZeppelin version to improve gas performance
 *
 */
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;

    // Base URI
    string private _baseURI;

    // Owner array
    address[] internal _owners;

    // 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}.
     * updated for owner array
     */
    function balanceOf(address owner)
        public
        view
        virtual
        override
        returns (uint256)
    {
        require(
            owner != address(0),
            "ERC721: balance query for the zero address"
        );
        uint256 _ownerBalance = 0;
        for (uint256 i = 0; i < _owners.length; i++) {
            if (_owners[i] == owner) _ownerBalance++;
        }
        return _ownerBalance;
    }

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

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

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

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

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

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

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @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 tokenId < _owners.length && _owners[tokenId] != address(0);
    }

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

    /**
     * @dev Safely mints `tokenId` 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);

        _owners.push(to);

        emit Transfer(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);

        _owners[tokenId] = address(0);

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

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

    /**
     * @dev 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 {}
}

// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index)
        external
        view
        returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

/**
 * borrowed from Nuclear Nerds implementation
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account but rips out the core of the gas-wasting processing that comes from OpenZeppelin.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(IERC165, ERC721)
        returns (bool)
    {
        return
            interfaceId == type(IERC721Enumerable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _owners.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index)
        public
        view
        virtual
        override
        returns (uint256)
    {
        require(
            index < _owners.length,
            "ERC721Enumerable: global index out of bounds"
        );
        return index;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index)
        public
        view
        virtual
        override
        returns (uint256 tokenId)
    {
        require(
            index < balanceOf(owner),
            "ERC721Enumerable: owner index out of bounds"
        );

        uint256 count;
        for (uint256 i; i < _owners.length; i++) {
            if (owner == _owners[i]) {
                if (count == index) return i;
                else count++;
            }
        }

        revert("ERC721Enumerable: owner index out of bounds");
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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