Contract 0xe8f88d16f24255FcFab25959705D724406D67D9d

 
 
Txn Hash
Method
Block
From
To
Value
0xe28914f6218eef4ee726153beb8f0d6679bb9320a7cf56f18677a99512f03c99Set Approval For...156380482022-09-29 9:16:111 day 19 hrs agoENS Name vault.robertclarke.eth IN  NFTiff: NFTiff Token0 Ether0.00019504 8
0xd726935a21ec123161ad119b739822350812802a0daead888b739898fd266afcSet Approval For...156380482022-09-29 9:16:111 day 19 hrs agoENS Name vault.robertclarke.eth IN  NFTiff: NFTiff Token0 Ether0.00019437 8
0x4f78bc5703c56f85fd3102553af46161d8bdc22969062165cb86d5cdb12257c5Set Approval For...156380482022-09-29 9:16:111 day 19 hrs agoENS Name vault.robertclarke.eth IN  NFTiff: NFTiff Token0 Ether0.00019504 8
0xfbb4bddbe5bf322191dd93f5f41ca1d3e92d2cc3f6ae2e11cf9e3de5b9ef0a0cSet Approval For...156380482022-09-29 9:16:111 day 19 hrs agoENS Name vault.robertclarke.eth IN  NFTiff: NFTiff Token0 Ether0.00019504 8
0x4d3ad6dcc5e1ebc98438825c6624eb433629558021cfe7c5b2ad5fb737de5b42Set Approval For...155780502022-09-20 23:46:1110 days 4 hrs agoENS Name vault.robertclarke.eth IN  NFTiff: NFTiff Token0 Ether0.0001219 5
0xab08edc192dbee4d61a997c5611b87553666d597d5cb5e544853c33f792db80eSet Approval For...155641932022-09-19 1:08:3512 days 3 hrs agoENS Name tomx.eth IN  NFTiff: NFTiff Token0 Ether0.00016603 6.81003721
0x2737bf41a1854082ff973f95052fe6b9ad89f9ee44820d6f15accea2ba46e527Safe Transfer Fr...155535962022-09-17 13:27:5913 days 15 hrs agoENS Name whom.eth IN  NFTiff: NFTiff Token0 Ether0.000777099
0xc25b44c5245c4ccbfe928bc525739eccc6106c491c326ec6b645c9e51bcdda45Set Approval For...155353022022-09-14 22:04:3316 days 6 hrs agoENS Name skee.eth IN  NFTiff: NFTiff Token0 Ether0.00052933 11.4553171
0x2a0c797865e1a17e533aa04ab67efafea8fc6af8cadfb1d651119a001e2a2bf7Safe Transfer Fr...154606992022-09-02 18:22:1728 days 10 hrs ago0x0503ed50534614193fcd085c5de01728a4824822 IN  NFTiff: NFTiff Token0 Ether0.00131943 15.28115531
0xf372377e0c1d4cf8d19976a7daff2b19bbd93500a3a34087cbd6006b55559ea1Set Approval For...154411332022-08-30 15:26:4631 days 13 hrs ago0xe4bb5b561d23313c89f53d80f049545f1afd2caf IN  NFTiff: NFTiff Token0 Ether0.00130185 28.12210747
0x143965b4bd253a32a727a19e0702f8259b35bc16be87f103daa9d35964e983feSafe Transfer Fr...154149062022-08-26 10:47:2135 days 17 hrs agoENS Name cryptokaiser.eth IN  NFTiff: NFTiff Token0 Ether0.00095508 10.7154031
0x5140e8136d140844c0b8c63ce49448fbbc5347620e6396fbdc418f3e282d20f8Safe Transfer Fr...154148912022-08-26 10:42:1235 days 17 hrs agoENS Name cryptokaiser.eth IN  NFTiff: NFTiff Token0 Ether0.0007421 8.32588386
0x3b19bfc370dd9f38e85a89eb79c9aaa01a6a52f8acefed4cefdb48f81243fc8dSafe Transfer Fr...154044402022-08-24 18:21:5937 days 10 hrs ago0x498840b48e9814a20069103c9d89bd3f618db28c IN  NFTiff: NFTiff Token0 Ether0.00118802 13.76107435
0x6a3f4755c16b92b32877d72aa4447aee13fa94a91a04ab445ecca1ef48e560e7Set Approval For...154043402022-08-24 17:58:3137 days 10 hrs ago0x629000a9fa4abbdbf71b812513b416c2ecbd6c71 IN  NFTiff: NFTiff Token0 Ether0.00078982 17.09245656
0x8e516e6d0a97ab91c105dcbc629d2a86fdc4775173f47c6d97dde7a05dd08364Set Approval For...153921792022-08-22 19:46:0439 days 8 hrs ago0x636e4446ab95cbb51b87f6595db92f41af777ad9 IN  NFTiff: NFTiff Token0 Ether0.00102859 22.25963937
0xebd11eb2769feb45a97723644dae3dbe0a42b5afa9873b7803f04f254a52a176Set Approval For...153734592022-08-19 20:39:3542 days 8 hrs ago0xffb7b4e47c31a965466a2c9f71c4c97208565fdd IN  NFTiff: NFTiff Token0 Ether0.00064312 13.9178346
0xadcddcaa49f02439e4aebee17e32b7df3c53c49b9fae328f743bda9b9b9f5b2cSafe Transfer Fr...153558812022-08-17 1:47:3945 days 2 hrs agoENS Name 2yeah.eth IN  NFTiff: NFTiff Token0 Ether0.00158637 16.20664432
0xc447cc6f769281af27162293b38f11784ece30daa76aeafbbcf3d4f1872cd156Set Approval For...153554112022-08-16 23:55:1845 days 4 hrs ago0xc440e04f4849708f41971a754f003fe2fd2093a3 IN  NFTiff: NFTiff Token0 Ether0.00014692 5.56942187
0x565a1ac80d096921eb083994fe939aa66a4af9bf2690dcc974be5e826ed445b0Set Approval For...153553952022-08-16 23:52:1245 days 4 hrs ago0xc440e04f4849708f41971a754f003fe2fd2093a3 IN  NFTiff: NFTiff Token0 Ether0.00016915 6.93815231
0xf5a17a9b449ea4f73087f5544a47c2a26bdc9cb59cb7c4f8aac2a6a388b9d638Transfer From153542492022-08-16 19:35:4445 days 9 hrs ago0x38eaafa59624f218ce68b17871aaf27fdf3433ba IN  NFTiff: NFTiff Token0 Ether0.00124658 14.92791435
0xfd72c4b555ab7d15fc8034fb6221fe8007cfd5ccecd9b40dc7585a73ac638dccTransfer From153508202022-08-16 6:40:4445 days 22 hrs ago0xd13ef84862e24fe6d6fe00ca4cf7b51f7fae0416 IN  NFTiff: NFTiff Token0 Ether0.00096897 11.60520813
0x67894c15cb49015486e03e9267a1ad81b0b44ee3a4974140b9a2d01db1da1e2eTransfer From153479542022-08-15 19:53:1446 days 8 hrs agoENS Name curiousforge.eth IN  NFTiff: NFTiff Token0 Ether0.00113627 13.60888241
0x48987da1467ae6e7cb7a2501e39593b94fa08d989f8ac7a107e29973b84fa99fTransfer From153468272022-08-15 15:35:2546 days 13 hrs ago0x722ce15c62082948b71dd7c94e51a1a565903480 IN  NFTiff: NFTiff Token0 Ether0.00118455 14.18510547
0x262e38918a7acae6f0f190217be6e6d8faeab2fbb9a1c60b9c1ce3443340a00cSet Approval For...153462602022-08-15 13:27:0646 days 15 hrs agoENS Name dvdd.eth IN  NFTiff: NFTiff Token0 Ether0.00044329 18.24487006
0x0601adcceef89657548bf5bf534aa11c3e68525d3f45a95d7c4fd51d77a26dd8Transfer From153431982022-08-15 1:37:2547 days 3 hrs agoENS Name defianceworks.eth IN  NFTiff: NFTiff Token0 Ether0.00105818 12.67358276
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OVERVIEW

NFTiff is a collection of 250 custom NFTs designed to become a digital and physical pendant of the beholders CryptoPunk designed by Tiffany & Co.

Latest 24 internal transactions
Parent Txn Hash Block From To Value
0x51747c9d6f5466ec5efd4926a3e62fa4c08ea12790fb12a10059565c99c13a1e152828572022-08-05 14:24:3056 days 14 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer450 Ether
0xc5c34640a5ea593fba7e7b1f497930852879bb2c4aecfe150bccc80d983bb99e152828332022-08-05 14:19:2356 days 14 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer390 Ether
0xc4c2c7c43c1cebe4de927ec47b527d6a41cde41301c8790ab667e2b82288c682152828132022-08-05 14:15:4456 days 14 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer1,650 Ether
0x6e2191a5ffa1d185acb1e16a166b654c946b58d5bb0ac90f68218bb1fb61a4e7152828032022-08-05 14:13:2456 days 14 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer1,080 Ether
0x0440bbac55496b3bc54307089e853e4b4fcc4d5f8c65b53355031b3bb1444d87152827902022-08-05 14:10:3356 days 14 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer930 Ether
0xb980631abfc6d30e089c60fd1ab73e20c1e64d9225143984d98ae484b91eac9b152731402022-08-04 2:10:2258 days 2 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer240 Ether
0x004a9c07cbd9a222a355aeb7e12a1d3a2de3a3f2a94a98a94da759f8ac274982152727282022-08-04 0:38:2858 days 4 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer60 Ether
0x3992dc2ab910c0b4a53176523a75d14df662752c6223885af2bdb69c35cf940e152725012022-08-03 23:45:3458 days 4 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer150 Ether
0x78feac0b3c313ba882437e62ade5e37d4e33fbcfca6691d879733eec1ff34df8152721512022-08-03 22:27:4458 days 6 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer180 Ether
0xfed24bf528d6574ba37ccaef4c07da5f17e06339f909dffdd5a15312018a427c152719152022-08-03 21:35:4258 days 7 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer210 Ether
0xe9c2c9c89ab4e7b858067127fc547db07dd1132d213cfb3553bea71e02ef102a152717792022-08-03 21:08:1358 days 7 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer60 Ether
0x3f4bc63a59bb01dc15555390e3861efa815350a70f85c47c2928044cf1d22345152716952022-08-03 20:48:5458 days 7 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer210 Ether
0x7fbc0406a06308fc570fca31412f8fb7f79317a48a3f308b6451bde8ee7058ad152712052022-08-03 19:05:2458 days 9 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer240 Ether
0x3577c586dec2581cd59f913f620dbcb2d0f9ef68d9bd8ac8201532c55d345013152709182022-08-03 17:52:3858 days 10 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer240 Ether
0x9d9a470415ce8fce8a5a8d71bf443a6bf550432de44738f6a3d5178fdf4ff318152706922022-08-03 17:07:3458 days 11 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer90 Ether
0x1216312ac3c8bf7de3b7d96f570839c207c911cf9941d59e58aa34e7e08a5f1b152705982022-08-03 16:46:5358 days 11 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer90 Ether
0xfa5600799b4c94a686def74469e0b920c12e517c27e5e3f60454e0e68fe765da152705102022-08-03 16:28:4858 days 12 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer240 Ether
0x94e72064e50ea5084bce60024b94fb64c1f520bbd3fd2ff632b01c2349a5f415152703012022-08-03 15:40:4158 days 13 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer360 Ether
0x5b4ae751662a83e6b18f4166fa38961d05c49076d084edfa4a6a5cdc7b99f935152702382022-08-03 15:28:3758 days 13 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer180 Ether
0x89ec4a39ba5183f7f1111e6defd70766f1682f80ad00d78b23d4b2b1311a8b35152701232022-08-03 14:59:2158 days 13 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer30 Ether
0x1bec7bfd2f372d2ba1697fcebda0524e39994903f65b851c06fee8e269a5f657152700802022-08-03 14:49:0858 days 13 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer120 Ether
0xa8fa689b610b8ccf7960487619aac450eb5c6fcced28fe74b00adc34401083f5152700552022-08-03 14:41:3458 days 14 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer240 Ether
0x6d2f190d955702531cb484e76c7916583252118bbbb8c2ba99f791779a961c10152697352022-08-03 13:27:3658 days 15 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer30 Ether
0x679baee66f3cedecc7678e81e1bab8ef846c63410e859f99f03dbae254b4959b152694652022-08-03 12:30:0258 days 16 hrs ago NFTiff: NFTiff TokenNFTiff: Deployer30 Ether
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
NFTiff

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2022-07-29
*/

// File: @openzeppelin/contracts/utils/Counters.sol


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

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol


// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// 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;
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol


// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @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);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol


// OpenZeppelin Contracts (last updated v4.7.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;


/**
 * @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.
            /// @solidity memory-safe-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.
            /// @solidity memory-safe-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 = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 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));
    }
}

// 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/utils/Address.sol


// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

// File: @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);
}

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol


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

pragma solidity ^0.8.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;


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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;


/**
 * @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);

    /**
     * @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);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol


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

pragma solidity ^0.8.0;


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

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

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

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol


// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;








/**
 * @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: address zero is not a valid owner");
        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: invalid token ID");
        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) {
        _requireMinted(tokenId);

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

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

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

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        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: caller is not token 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: caller is not token 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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {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 an {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 Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @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 {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

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

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

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol


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

pragma solidity ^0.8.0;



/**
 * @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();
    }
}

// File: contracts/NFTiff.sol



// @title: NFTiff
// @author: Tiffany Team

pragma solidity ^0.8.7;







interface ICryptoPunks {
    function punkIndexToAddress(uint256) external view returns (address);
}

contract NFTiff is ERC721Enumerable, Ownable, ReentrancyGuard {
    using Strings for uint256;
    using ECDSA for bytes32;

    string public notRevealedUri;
    mapping(uint256 => string) private _tokenURIs;

    uint256 public cost = 30 ether;
    uint256 public maxSupply = 500;
    uint256 public maxMintAmount = 3;
    uint256 public presaleSupply = 150;
    uint256 public presaleEndTimestamp;
    bool public presaleActive = false;
    bool public publicSaleActive = false;
    bool public paused = false;
    bool public revealed = false;
    bool public isKycRequired = true;
    address private signer; // signer to make signature
    mapping(address => uint256) public whitelistMinted; // address => amount
    mapping(address => bool) public whitelistedAddresses;
    mapping(address => bool) public blacklistedAddresses;
    address public immutable punksContract; // mainnet punks - 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB

    uint256 public totalClaimed;
    mapping(uint256 => ClaimInfo) public claimInfo; // claimId => ClaimInfo
    mapping(uint256 => uint256) public nftiffClaims; // nftiffId => claimId
    mapping(uint256 => uint256) public punkClaims; // punkId => claimId

    /** DATA STRUCTURE */
    struct ClaimInfo {
        uint256 punkId;
        uint256 nftiffId;
        uint256 timestamp;        
        address claimer;
    }

    /** EVENTS */
    event TokenURIUpdated(uint256 indexed tokenId, string uri);
    event BaseURISet(string baseURI);
    event NFTiffMinted(address indexed to, uint256 indexed tokenId);
    event Claimed(uint256 claimId, address indexed to, uint256 punkId, uint256 nftiffId, uint256 timestamp);
    event UsersWhitelisted(address[] users);
    event UsersBlacklisted(address[] users);
    event SignerChanged(address signer);
    event KycRequireChanged(bool kycRequired);
    event PublicSaleStatusChanged(bool isActive);
    event PresaleStatusChanged(bool isActive);
    event MaxSupplyChanged(uint256 maxSupply);
    event NotRevealedUriChanged(string uri);
    event MaxMintAmountChanged(uint256 amount);
    event PresaleSupplyChanged(uint256 amount);
    event PresaleEndTimestampChanged(uint256 timestamp);
    event CostChanged(uint256 cost);
    event Paused(bool isPaused);
    event Revealed();

    /** METHODS */
    constructor(string memory _initNotRevealedUri, address punksContract_) ERC721("NFTiff", "NFTiff") {
        setNotRevealedURI(_initNotRevealedUri);
        signer = msg.sender;
        punksContract = punksContract_;
    }
    
    //MODIFIERS
    modifier notPaused {
         require(!paused, "Contract paused");
         _;
    }

    modifier notBlacklisted(address user_) {
         require(!blacklistedAddresses[user_], "Blacklisted user");
         _;
    }

    // INTERNAL

    function kycValidations(bytes memory _signature) internal view {
        if(isKycRequired) {
            bytes32 hash = keccak256(abi.encodePacked("kyc-approved", msg.sender));
            address signer_ = hash.toEthSignedMessageHash().recover(_signature);
            require(signer_ == signer, "Kyc not approved");
        }
    }

    //MINT
    function mint1(uint256 _mintAmount, bytes memory _signature) public payable notPaused nonReentrant notBlacklisted(msg.sender) {
        require(presaleActive, "Sale has not started yet");
        require(block.timestamp < presaleEndTimestamp, "Presale ended");
        require(whitelistedAddresses[msg.sender], "Not whitelisted user");
        require(msg.value >= cost * _mintAmount, "Insufficient funds");
        require(_mintAmount > 0, "Need to mint at least 1 NFT");
        require(_mintAmount + whitelistMinted[msg.sender] <= maxMintAmount, "Max mint amount exceeded");
        uint256 supply = totalSupply();
        require(supply + _mintAmount <= presaleSupply, "Presale supply limit exceeded");

        kycValidations(_signature);

        whitelistMinted[msg.sender] += _mintAmount;
        for (uint256 i = 1; i <= _mintAmount; i++) {
            _safeMint(msg.sender, supply + i);
            emit NFTiffMinted(msg.sender, supply + i);
        }
    }
    
    function gift(uint256 _mintAmount, address destination) public onlyOwner {
        require(_mintAmount > 0, "Need to mint at least 1 NFT");
        uint256 supply = totalSupply();
        require(supply + _mintAmount <= maxSupply, "Max NFT limit exceeded");

        for (uint256 i = 1; i <= _mintAmount; i++) {
            _safeMint(destination, supply + i);
            emit NFTiffMinted(destination, supply + i);
        }
    }

    //MINT Public
    function mintPublic(uint256 _mintAmount, bytes memory _signature) public payable notPaused nonReentrant notBlacklisted(msg.sender) {
        require(publicSaleActive, "Sale has not started yet");
        require(msg.value >= cost * _mintAmount, "Insufficient funds");
        require(_mintAmount > 0, "Need to mint at least 1 NFT");
        require(_mintAmount + whitelistMinted[msg.sender] <= maxMintAmount, "Max mint amount exceeded");
        uint256 supply = totalSupply();
        require(supply + _mintAmount <= maxSupply, "Max NFT limit exceeded");

        kycValidations(_signature);

        whitelistMinted[msg.sender] += _mintAmount;
        for (uint256 i = 1; i <= _mintAmount; i++) {
            _safeMint(msg.sender, supply + i);
            emit NFTiffMinted(msg.sender, supply + i);
        }
    }

    //CLAIM
    function claim(uint256 punk_, uint256 nftiff_, bytes memory _signature) public payable notPaused nonReentrant notBlacklisted(msg.sender) {
        require(nftiffClaims[nftiff_] == 0, "Already claimed nftiff");
        require(punkClaims[punk_] == 0, "Already claimed punk");
        require(ownerOf(nftiff_) == msg.sender, "Not nftiff owner");
        require(ICryptoPunks(punksContract).punkIndexToAddress(punk_) == msg.sender, "Not punks owner");

        bytes32 hash = keccak256(abi.encodePacked("shipping-verified", punk_, nftiff_, msg.sender));
        address signer_ = hash.toEthSignedMessageHash().recover(_signature);
        require(signer_ == signer, "Shipping not verified");

        totalClaimed++;
        nftiffClaims[nftiff_] = totalClaimed;
        punkClaims[punk_] = totalClaimed;

        claimInfo[totalClaimed] = ClaimInfo({
            punkId: punk_,
            nftiffId: nftiff_,
            timestamp: block.timestamp,
            claimer: msg.sender
        });
        emit Claimed(totalClaimed, msg.sender, punk_, nftiff_, block.timestamp);
    }

    // Cold Wallet Link
    function claimCold(uint256 punk_, uint256 nftiff_, address coldWallet_, bytes memory shipSignature_, bytes memory coldSignature_) public payable notPaused nonReentrant notBlacklisted(msg.sender) {
        require(nftiffClaims[nftiff_] == 0, "Already claimed nftiff");
        require(punkClaims[punk_] == 0, "Already claimed punk");
        require(ownerOf(nftiff_) == msg.sender, "Not nftiff owner");
        require(ICryptoPunks(punksContract).punkIndexToAddress(punk_) == coldWallet_, "Cold wallet not punks owner");

        bytes32 hash = keccak256(abi.encodePacked("shipping-verified", punk_, nftiff_, msg.sender));
        address signer_ = hash.toEthSignedMessageHash().recover(shipSignature_);
        require(signer_ == signer, "Shipping not verified");

        hash = keccak256(abi.encodePacked("cold-verified", punk_, nftiff_, msg.sender, coldWallet_));
        signer_ = hash.toEthSignedMessageHash().recover(coldSignature_);
        require(signer_ == signer, "Cold wallet not verified");

        totalClaimed++;
        nftiffClaims[nftiff_] = totalClaimed;
        punkClaims[punk_] = totalClaimed;

        claimInfo[totalClaimed] = ClaimInfo({
            punkId: punk_,
            nftiffId: nftiff_,
            timestamp: block.timestamp,
            claimer: msg.sender
        });
        emit Claimed(totalClaimed, msg.sender, punk_, nftiff_, block.timestamp);
    }

    //PUBLIC VIEWS

    function getSigner() public view returns (address) {
        return signer;
    }

    function walletOfOwner(address _owner) public view returns (uint256[] memory) {
        uint256 ownerTokenCount = balanceOf(_owner);
        uint256[] memory tokenIds = new uint256[](ownerTokenCount);
        for (uint256 i; i < ownerTokenCount; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return tokenIds;
    }

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

        string memory _tokenURI; 
        if (!revealed) {
            _tokenURI = notRevealedUri;
        } else {
            _tokenURI = _tokenURIs[tokenId];
        }

        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        // if baseURI exists and tokenURI not set, returns ""
        return ""; // super.tokenURI(tokenId);
    }

    //ONLY OWNER SETTERS
    function setBaseURI(string calldata baseURI) external onlyOwner {
        _baseTokenURI = baseURI;
        emit BaseURISet(baseURI);
    }

    function setTokenURI(uint256 tokenId, string memory _tokenURI) public onlyOwner {
        require(_exists(tokenId), "URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
        emit TokenURIUpdated(tokenId, _tokenURI);
    }

    function reveal() public onlyOwner {
        revealed = true;
        emit Revealed();
    }

    function pause(bool _state) public onlyOwner {
        paused = _state;
        emit Paused(_state);
    }

    function setCost(uint256 _newCost) public onlyOwner {
        cost = _newCost;
        emit CostChanged(_newCost);
    }

    function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner {
        maxMintAmount = _newmaxMintAmount;
        emit MaxMintAmountChanged(_newmaxMintAmount);
    }

    function setPresaleSupply(uint256 _amount) public onlyOwner {
        require(_amount <= maxSupply, "Max supply limit exceeded");
        presaleSupply = _amount;
        emit PresaleSupplyChanged(_amount);
    }

    function setPresaleEndTimestamp(uint256 _timestamp) public onlyOwner {
        require(_timestamp > block.timestamp, "Invalid timestamp");
        presaleEndTimestamp = _timestamp;
        emit PresaleEndTimestampChanged(_timestamp);
    }

    function setNotRevealedURI(string memory _notRevealedURI) public onlyOwner {
        notRevealedUri = _notRevealedURI;
        emit NotRevealedUriChanged(_notRevealedURI);
    }

    function setMaxSupply(uint256 _maxSupply) public onlyOwner {
        require(_maxSupply >= totalSupply(), "Max supply should be greater");
        maxSupply = _maxSupply;
        emit MaxSupplyChanged(_maxSupply);
    }

    function setPresaleStatus(bool _saleActive) public onlyOwner {
        presaleActive = _saleActive;
        emit PresaleStatusChanged(_saleActive);
    }

    function setPublicSaleStatus(bool _saleActive) public onlyOwner {
        publicSaleActive = _saleActive;
        emit PublicSaleStatusChanged(_saleActive);
    }

    function setKycRequired(bool _required) public onlyOwner {
        isKycRequired = _required;
        emit KycRequireChanged(_required);
    }

    function setSigner(address signer_) public onlyOwner {
        signer = signer_;
        emit SignerChanged(signer_);
    }

    function whitelistUsers(address[] memory addresses) public onlyOwner {
        for (uint256 i = 0; i < addresses.length; i++) {
            whitelistedAddresses[addresses[i]] = true;
        }
        emit UsersWhitelisted(addresses);
    }

    function blacklistUsers(address[] memory addresses) public onlyOwner {
        for (uint256 i = 0; i < addresses.length; i++) {
            blacklistedAddresses[addresses[i]] = true;
        }
        emit UsersBlacklisted(addresses);
    }

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

    // metadata URI
    string private _baseTokenURI;

    function _baseURI() internal view virtual override returns (string memory) {
        return _baseTokenURI;
    }

}

Contract Security Audit

Contract ABI

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000b47e3cd837ddf8e4c57f05d70ab865de6e193bbb00000000000000000000000000000000000000000000000000000000000000522268747470733a2f2f676174657761792e70696e6174612e636c6f75642f697066732f516d626f4a774c3867755739426f5643773936555573774b4833565374703853766148567a377a54313946646155220000000000000000000000000000

-----Decoded View---------------
Arg [0] : _initNotRevealedUri (string): "https://gateway.pinata.cloud/ipfs/QmboJwL8guW9BoVCw96UUswKH3VStp8SvaHVz7zT19FdaU"
Arg [1] : punksContract_ (address): 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 000000000000000000000000b47e3cd837ddf8e4c57f05d70ab865de6e193bbb
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000052
Arg [3] : 2268747470733a2f2f676174657761792e70696e6174612e636c6f75642f6970
Arg [4] : 66732f516d626f4a774c3867755739426f5643773936555573774b4833565374
Arg [5] : 703853766148567a377a54313946646155220000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://9326ec9a4fbb4d14eedcd5eabdd9f07ec42216eb6006cdd6f4885e0178f30910
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.