Contract 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b8166 1

 
 
Txn Hash
Method
Block
From
To
Value [Txn Fee]
0x1f3ca10010d5cdb26272006aee4ac746cca4b2344cd0bca211b289500450f7a2Mint432586432023-05-28 18:17:514 hrs 13 mins ago0xe2aa2961990b4baf4194b080bf194aa1c1ab9850 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b816678.96887249 MATIC0.039726660709 162.166845093
0x127d4ff141c8f2f45648b94cd8a62fa5a6f743114296e977271687463510383fSet Approval For...432410662023-05-28 7:46:1414 hrs 44 mins ago0x3f5800a21460caee34c9f289ae56f6dd189de55c IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.006810030996 147.320360762
0x20873152e9c99e4dc1c3f4ee9860ba17be626cb23846322ebce55df9be2647d4Set Approval For...432387202023-05-28 6:23:0416 hrs 7 mins ago0x0fe344b395b8a77535b6a72789f36f72492a3014 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.006532801558 141.323098654
0x19e82e6bf3b790258a87c643184e2fd684e296975800363e16ea66ef49ad6db8Set Approval For...432112622023-05-27 13:29:301 day 9 hrs ago0xb28a72e16c8e74dc8a789f73d859263c163bd6ca IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.007881674155 170.5030536
0xab53f07a130bd98322d36526ed15b4a0f4b467aa801297de87a3a14d6ffbd16bSet Approval For...432074312023-05-27 11:12:241 day 11 hrs ago0xd578b8f33a0234e347efc59061acab02db771d35 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.00636902085 137.780055598
0x987765ee0996fe15a1d0225a570ad2e1759842a731be8fb3f73f1f4055fb953dSet Approval For...432054902023-05-27 10:02:341 day 12 hrs ago0x8b316e5d2bac7fc44dbdeff6b8106fcb95e281c7 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.006674517088 144.388809084
0x6177b066e28be4e846f5259b7edb75b44feb6ca4857e092f0004a268ed63f5cdSet Approval For...432037912023-05-27 8:59:391 day 13 hrs ago0xe760fad54df992e8c7b7d417ff40fadd4e1b0dc2 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.007100768601 153.609842978
0xc48a3081be3658d07f21c514246a5be74046aa14644284fdca0f6c5c8724d32cSet Approval For...432026582023-05-27 8:16:411 day 14 hrs ago0x79debdbde00857699e2eb45f12c6ec7335d0fa41 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.004755563002 180.641305252
0xd47c61f940cab7bcf43f416382550b1d715fd487368256de664bd9b665a6cd52Set Approval For...432026532023-05-27 8:16:291 day 14 hrs ago0x79debdbde00857699e2eb45f12c6ec7335d0fa41 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.008349263586 180.618344373
0x9cd180b2284b117acd99c6cc84faebebd33242f552e3ea6f6240d2a99b291a6dSet Approval For...431984332023-05-27 5:37:201 day 16 hrs ago0x91cc0a69f6181ea8ff81c8bac8af2525fe871738 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.007481289629 161.841596282
0xd62196dee7a1143eac22e8f7746e196e67ab4c288fb30b621b111f886fd9c7ccSet Approval For...431843822023-05-26 20:59:552 days 1 hr ago0x9a7080277dd161ed0a17e0cfd18d34633a3d0566 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.006216375832 134.47790924
0x9b94c864096a8962730eecd5085932dfe81822d00872a9f73e9c3d9856b2ef2aSet Approval For...431802242023-05-26 18:31:402 days 3 hrs ago0x342e29e3e3653240758499ea8dc688348ce0ed52 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.006301589143136.321315794
0x4aaaa5f68b3381ba96365e568a94c15966fc7b20111f41357e0eec7579475e24Set Approval For...431791502023-05-26 17:53:312 days 4 hrs ago0x42832aa0ebce9a371b9c7d3dc9a2e0c00af57a3c IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.00621455808 134.438586087
0xbce553f27914b3ff2466fa1595fef13d386b3f9653464a190293c9ab5e699ee9Set Approval For...431785672023-05-26 17:32:532 days 4 hrs ago0x517f1502fb7c2e25b80b20cee89c5820278642b8 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.006996555062151.355407404
0x6d553fdde2d39e682a4bf207b847a3ca111dc6d0bba94d32f36c9cda62491f6eSet Approval For...431774922023-05-26 16:53:442 days 5 hrs ago0xfe16d9bcb1502b35b302c622115da267e591661c IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.007971051392 172.436537707
0xea4d1b4ebf5194ceaf3c02f8b3a8c3483495939ad2e73abd6f07f8ac607993feSet Approval For...431760272023-05-26 16:00:052 days 6 hrs ago0x4cf855f3c1cda96d355eff7aeb18ee04b75e47f7 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.009259462214 200.308532314
0x4ade510f9344e81891e5ba380b4116670bea5c67692b8747f920a05f0b6ffd2eSet Approval For...431744312023-05-26 15:03:252 days 7 hrs ago0x9a627eb44883417dc1087855d5a90e091980a9e9 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.007229819816 156.401588202
0xb235aeb9817c2b3f6797f868298a7c3baf2ac17bd0ac2403106c315391850a21Set Approval For...431743662023-05-26 15:01:072 days 7 hrs ago0x36b1b9d25622cf512a827990b7ec49b508870a40 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.008929059616 193.160983354
0x3179566343f56fd136ec26df7103c3939c1ca9478555ee5f990555392fd4e7deSet Approval For...431743112023-05-26 14:59:112 days 7 hrs ago0xc15cace3b0e44de6486d0d79323b4a8d3cc0ead7 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.00756077365 163.561061961
0xd8654ba85b76bbc8976d2f57f7d3c38c8890c100ca0c78f52b65c9564a0c4d85Set Approval For...431742532023-05-26 14:57:072 days 7 hrs ago0x2b31a727c6b8a2f76e3b6413e6efcbc55352a3da IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.007244547651 156.720193204
0x464ec4bdacfcad7347e282811d99ed9da97158b238951c14cb7b1c3299588896Transfer From431741832023-05-26 14:54:392 days 7 hrs ago0xe4ac9b1dfc147c6c4be09f274b0338907c2366b1 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.014770899997 177.160094003
0xee2b54a771fbc77ac38fdd2fef15d0ec08d8efb646ecddf8cd4987b0e5db9dfeTransfer From431741582023-05-26 14:53:452 days 7 hrs ago0xe4ac9b1dfc147c6c4be09f274b0338907c2366b1 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.017404657599 201.966412913
0xc1f82050f1076f8f554b2ff0f7def121f0e872405940c23323db7d1f5dbfde55Transfer From431741312023-05-26 14:52:492 days 7 hrs ago0xe4ac9b1dfc147c6c4be09f274b0338907c2366b1 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.022944568586 237.871079506
0xb67a8aab644ce7c01afa6cba6cee1944d6bafe0c9af635958d982e4f2575ff01Set Approval For...431736782023-05-26 14:36:092 days 7 hrs ago0xe4ac9b1dfc147c6c4be09f274b0338907c2366b1 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.011342503864 245.370654272
0xb5ee815d4c71504d76175688c5f37874db3fac86a4ccbe2d15d2f874520d93deSet Approval For...431735782023-05-26 14:32:372 days 7 hrs ago0x861644c4723512d0ae9528a32919749f981b9466 IN  0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660 MATIC0.013799323674 298.5186621
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0x1f3ca10010d5cdb26272006aee4ac746cca4b2344cd0bca211b289500450f7a2432586432023-05-28 18:17:514 hrs 13 mins ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660x9a627eb44883417dc1087855d5a90e091980a9e978.96887249 MATIC
0x537bd71dd43f5e44605dcd5b8c8ec232a31ca979d012204749666e0ee69e5dc1423693142023-05-06 9:39:0422 days 12 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda102.78893962 MATIC
0x53b015b3fea454cf94976a38c1599abc4b5fdbd8cebb47d9329e53a048c53588308767232022-07-18 22:57:37313 days 23 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda148.65229091 MATIC
0xb1008f44e3fdc4a89f44a7b17145bd4ab2d285777874647c1300ed3ac03dd266308762352022-07-18 22:38:45313 days 23 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda1,486.52290909 MATIC
0x99b08b13ac2f227afaa00f7b0246075519550cd2b02c0f013446fa130a507c83306814722022-07-13 13:43:48319 days 8 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda92.90768182 MATIC
0x7e04af671ffe74eee2eb01b4e2f5d68fc2e136124fbff21d1ee21bc932b0ad14306101262022-07-11 17:08:00321 days 5 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda1,449.35983636 MATIC
0xab0b5a4f6bc3e81ece530d943b916c7218175822251f6240b77b4be387e3cd95302982282022-07-03 17:51:13329 days 4 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda74.87025129 MATIC
0x5f9249dc8eb5979168399bab3a917d4c97e049d9fa3760bc02dfdc28d99e7c4d302972782022-07-03 17:16:20329 days 5 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda119.79240207 MATIC
0x40b3c65523e2a8c32a4a6771a3ebe8dd22b21492de5b1b263c617b85749ac458302939612022-07-03 15:11:25329 days 7 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda74.87025129 MATIC
0x3130c6993e7cf1e9f860279040c47a503168d741eff99a2027b775fac48d485e299057632022-06-23 12:11:23339 days 10 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda119.79240207 MATIC
0x2a7dda99c7eb6f172e4e0574468441ad04c10e12cd179114c0e369735eddbca8292139112022-06-05 23:14:57356 days 23 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda74.87025129 MATIC
0x4239862bcae00645e1c65e43d333bbd1959b125180588373201c339951bc79b9292118402022-06-05 22:01:38357 days 29 mins ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda74.87025129 MATIC
0x17b6f1d3cb762c7e3f2fed0c642a2b54f500a0e61f4319cdc65f84066bdbabf1290105392022-05-31 23:17:42361 days 23 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda748.70251293 MATIC
0x7f9329b8a2a74821bce243895afe6792c461618d74f43b994a2ba68737d78d61284752662022-05-18 16:52:06375 days 5 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660xcedb29daa09fa7339b708d686e8834e9f02e0dda74.87025129 MATIC
0xa8535537bb17bab8c66b5fe0009faff5928d03155ffe7ab1a3033efc0371c5e4279950412022-05-06 14:42:25387 days 7 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660x92c8a2b4e36eca320909387b6eda9867a6fc214e224.61075388 MATIC
0xd9195bec4d26bde0fb00dc9ca6090a1f7ca5dea69227c156a00860b96c136311278769362022-05-03 14:00:41390 days 8 hrs ago 0x809faf2bf3c1c8c2dd64c5cdfef1ae6a524b81660x92c8a2b4e36eca320909387b6eda9867a6fc214e74.87025129 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
GrabCoinClub

Compiler Version
v0.8.10+commit.fc410830

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2022-04-29
*/

// Dependency file: @openzeppelin/contracts/utils/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);
    }
}


// Dependency file: @openzeppelin/contracts/utils/cryptography/ECDSA.sol

// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/utils/Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}


// Dependency file: @openzeppelin/contracts/token/ERC20/IERC20.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

// pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}


// Dependency file: @openzeppelin/contracts/utils/introspection/IERC165.sol

// 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);
}


// Dependency file: @openzeppelin/contracts/token/ERC721/IERC721.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/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`, 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;
}


// Dependency file: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol

// OpenZeppelin Contracts v4.4.1 (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 `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}


// Dependency file: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/token/ERC721/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);
}


// Dependency file: @openzeppelin/contracts/utils/Address.sol

// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

// pragma solidity ^0.8.0;

/**
 * @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);
            }
        }
    }
}


// Dependency file: @openzeppelin/contracts/utils/Context.sol

// 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;
    }
}


// Dependency file: @openzeppelin/contracts/utils/introspection/ERC165.sol

// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/utils/introspection/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;
    }
}


// Dependency file: @openzeppelin/contracts/token/ERC721/ERC721.sol

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

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
// import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
// import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
// import "@openzeppelin/contracts/utils/Address.sol";
// import "@openzeppelin/contracts/utils/Context.sol";
// import "@openzeppelin/contracts/utils/Strings.sol";
// import "@openzeppelin/contracts/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 overriden 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 || 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);

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

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

        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);

        _balances[from] -= 1;
        _balances[to] += 1;
        _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 {}
}


// Dependency file: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol

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

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/token/ERC721/IERC721.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);
}


// Dependency file: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol

// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
// import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";

/**
 * @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.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @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-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

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

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

    /**
     * @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` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * 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 override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}


// Dependency file: @openzeppelin/contracts/security/ReentrancyGuard.sol

// 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;
    }
}


// Dependency file: @openzeppelin/contracts/access/Ownable.sol

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/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);
    }
}


// Root file: contracts/GrabCoinClub.sol

pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/utils/Strings.sol";
// import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
// import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
// import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
// import "@openzeppelin/contracts/access/Ownable.sol";

contract GrabCoinClub is ERC721, ERC721Enumerable, ReentrancyGuard, Ownable {
    using Strings for uint256;

    uint256 public constant maxSupply = 15555;
    uint256 public mintLimit = 5; // TODO
    uint256 public mintPresaleLimit = 1; // TODO
    mapping(uint256 => uint256) public mintedAt;
    mapping(address => mapping(uint256 => uint256)) public mintsOf;
    mapping(address => mapping(uint256 => uint256)) public mintsPresaleOf;
    mapping(address => uint256) public mintNonce;

    // Series
    struct Series {
        uint256 id;
        bool unlocked;
        uint256 next;
        uint256 last;
    }
    uint256 public constant seriesTotal = 15;
    Series[seriesTotal] public series;

    // Metadata
    string public contractURI; // TODO
    string public baseURI; // TODO
    string public baseExtension = ".json";

    // Addresses
    address public admin = 0x833A386DbF31b5CA853b418716ADD0F5511A365b; // TODO
    address public signer = 0x0E52Bee0EF46ed96F2CA50Ea22B5C1B5C750a1d4; // TODO
    address public wallet = 0x92c8a2B4E36eCa320909387B6EdA9867a6Fc214E; // TODO

    constructor() ERC721("GrabCoinClub", "GCC") {
        uint256[seriesTotal] memory series_ = [
            uint256(3000),
            uint256(2800),
            uint256(2300),
            uint256(2000),
            uint256(1700),
            uint256(1500),
            uint256(1000),
            uint256(550),
            uint256(300),
            uint256(200),
            uint256(100),
            uint256(50),
            uint256(25),
            uint256(20),
            uint256(10)
        ];
        uint256 last = 0;
        for (uint256 i = 0; i < series_.length; i++) {
            series[i] = Series(i, i < 7, last, last += series_[i]);
        }
    }

    // Mint
    function mintAdmin(uint256 series_, uint256 quantity_) public onlyAdmin {
        _internalMint(series_, quantity_, _msgSender());
    }

    function mintAirdrop(uint256 series_, address[] memory accounts_)
        public
        onlyAdmin
    {
        for (uint256 i = 0; i < accounts_.length; i++) {
            _internalMint(series_, 1, accounts_[i]);
        }
    }

    function mintPresale(
        uint256 series_,
        uint256 quantity_,
        address tokenAddress_,
        uint256 amount_,
        uint256 nonce_,
        bytes memory signature_
    ) public payable {
        _checkSignature(
            _msgSender(),
            series_,
            quantity_,
            tokenAddress_,
            amount_,
            nonce_,
            signature_
        );
        _distribute(_msgSender(), tokenAddress_, amount_);
        _internalMintWithLimit(
            series_,
            quantity_,
            _msgSender(),
            mintPresaleLimit,
            mintsPresaleOf[_msgSender()][series_]
        );
        mintsPresaleOf[_msgSender()][series_] += quantity_;
    }

    function mint(
        uint256 series_,
        uint256 quantity_,
        address tokenAddress_,
        uint256 amount_,
        uint256 nonce_,
        bytes memory signature_
    ) public payable {
        _checkSignature(
            _msgSender(),
            series_,
            quantity_,
            tokenAddress_,
            amount_,
            nonce_,
            signature_
        );
        _distribute(_msgSender(), tokenAddress_, amount_);
        _internalMintWithLimit(
            series_,
            quantity_,
            _msgSender(),
            mintLimit,
            mintsOf[_msgSender()][series_]
        );
        mintsOf[_msgSender()][series_] += quantity_;
    }

    function _internalMintWithLimit(
        uint256 series_,
        uint256 quantity_,
        address account_,
        uint256 mintLimit_,
        uint256 mints_
    ) private {
        require(mints_ + quantity_ <= mintLimit_, "Mint limit");
        _internalMint(series_, quantity_, account_);
    }

    function _internalMint(
        uint256 series_,
        uint256 quantity_,
        address account_
    ) private nonReentrant {
        require(series[series_].unlocked, "Series locked");
        require(
            series[series_].next + quantity_ <= series[series_].last,
            "Out of bounds"
        );

        for (uint256 i = 0; i < quantity_; i++) {
            uint256 tokenId = series[series_].next++;
            _safeMint(account_, tokenId);
            mintedAt[tokenId] = block.timestamp;
        }
    }

    function _distribute(
        address from_,
        address tokenAddress_,
        uint256 amount_
    ) private {
        if (tokenAddress_ == address(0) && amount_ > 0) {
            _sendEth(wallet, amount_);
        } else if (amount_ > 0) {
            IERC20(tokenAddress_).transferFrom(from_, address(this), amount_);
            _sendErc20(tokenAddress_, wallet, amount_);
        }
    }

    function setMintLimit(uint256 newMintLimit) public onlyOwner {
        mintLimit = newMintLimit;
    }

    function setMintPresaleLimit(uint256 newMintPresaleLimit) public onlyOwner {
        mintPresaleLimit = newMintPresaleLimit;
    }

    // Overrides
    function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );

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

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal override(ERC721, ERC721Enumerable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, ERC721Enumerable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    // Extra
    function rawOwnerOf(uint256 tokenId) public view returns (address) {
        if (_exists(tokenId)) return ownerOf(tokenId);
        return address(0);
    }

    function tokensOfOwner(address owner)
        public
        view
        returns (uint256[] memory)
    {
        uint256 balance = balanceOf(owner);
        require(0 < balance, "ERC721Enumerable: owner index out of bounds");
        uint256[] memory tokenIds = new uint256[](balance);
        for (uint256 i = 0; i < balance; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(owner, i);
        }
        return tokenIds;
    }

    // Metadata
    function setContractURI(string memory contractURI_) public onlyOwner {
        contractURI = contractURI_;
    }

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

    function setBaseExtension(string memory baseExtension_) public onlyOwner {
        baseExtension = baseExtension_;
    }

    // Series
    function seriesOf(uint256 tokenId) public view returns (uint256 seriesId) {
        require(tokenId < maxSupply, "Out of bounds");
        for (uint256 i = 0; i < series.length; i++) {
            if (tokenId < series[i].last) {
                return i;
            }
        }
    }

    function unlock(uint256 series_) public onlyOwner {
        series[series_].unlocked = true;
    }

    // Admin
    modifier onlyAdmin() {
        require(admin == _msgSender(), "Caller is not the admin");
        _;
    }

    function setAdmin(address newAdmin) public onlyOwner {
        admin = newAdmin;
    }

    // Signature
    function setSigner(address newSigner) public onlyOwner {
        signer = newSigner;
    }

    function signatureWallet(
        address wallet_,
        uint256 series_,
        uint256 quantity_,
        address tokenAddress_,
        uint256 amount_,
        uint256 nonce_,
        bytes memory signature_
    ) public pure returns (address) {
        return
            ECDSA.recover(
                keccak256(
                    abi.encode(
                        wallet_,
                        series_,
                        quantity_,
                        tokenAddress_,
                        amount_,
                        nonce_
                    )
                ),
                signature_
            );
    }

    function _checkSignature(
        address wallet_,
        uint256 series_,
        uint256 quantity_,
        address tokenAddress_,
        uint256 amount_,
        uint256 nonce_,
        bytes memory signature_
    ) private {
        require(
            mintNonce[wallet_] < nonce_,
            "Can not repeat a prior transaction!"
        );
        require(
            signatureWallet(
                wallet_,
                series_,
                quantity_,
                tokenAddress_,
                amount_,
                nonce_,
                signature_
            ) == signer,
            "Not authorized to mint"
        );
        mintNonce[wallet_] = nonce_;
    }

    // withdraw
    function setWallet(address newWallet) public onlyOwner {
        wallet = newWallet;
    }

    function withdraw(address to, uint256 amount) public onlyOwner {
        _sendEth(to, amount);
    }

    function withdrawErc20(
        address token,
        address to,
        uint256 amount
    ) public onlyOwner {
        _sendErc20(token, to, amount);
    }

    function _sendEth(address recipient, uint256 amount) private {
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "ETH_TRANSFER_FAILED");
    }

    function _sendErc20(
        address tokenAddress,
        address recipient,
        uint256 amount
    ) private {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = tokenAddress.call(
            abi.encodeWithSelector(0xa9059cbb, recipient, amount)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "ERC20_TRANSFER_FAILED"
        );
    }
}

Contract Security Audit

Contract ABI

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tateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"mintsPresaleOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"rawOwnerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"series","outputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"bool","name":"unlocked","type":"bool"},{"internalType":"uint256","name":"next","type":"uint256"},{"internalType":"uint256","name":"last","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"seriesOf","outputs":[{"internalType":"uint256","name":"seriesId","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"seriesTotal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newAdmin","type":"address"}],"name":"setAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"baseExtension_","type":"string"}],"name":"setBaseExtension","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"baseURI_","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"contractURI_","type":"string"}],"name":"setContractURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newMintLimit","type":"uint256"}],"name":"setMintLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newMintPresaleLimit","type":"uint256"}],"name":"setMintPresaleLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSigner","type":"address"}],"name":"setSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newWallet","type":"address"}],"name":"setWallet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"wallet_","type":"address"},{"internalType":"uint256","name":"series_","type":"uint256"},{"internalType":"uint256","name":"quantity_","type":"uint256"},{"internalType":"address","name":"tokenAddress_","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"},{"internalType":"uint256","name":"nonce_","type":"uint256"},{"internalType":"bytes","name":"signature_","type":"bytes"}],"name":"signatureWallet","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"signer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"tokensOfOwner","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"series_","type":"uint256"}],"name":"unlock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"wallet","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawErc20","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://b13963a407986e67540720be8b879fb4804ea06e1abb5e8d11cb37f5fdd5ca5d
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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