Contract 0x18487D2CaC946c7Fe800855c4039aAC210f68bAa 2

 
Txn Hash
Method
Block
From
To
Value
0x1b28490d6be83718fe743747e1b5dd1ae45235c24e4d229d7889fe8eb9b454a7Set Approval For...153571242022-08-17 6:28:431 hr 8 mins ago0xbf2764c45df0b453f371cce6b100521533117c2f IN  Generative Dungeon: GENDUN Token0 Ether0.‍00053168 11.‍50106967
0x43c1d6aacb7fdb331bb20ba1d67e40de9e0037b9f2a90121cf19562284b1bb55Set Approval For...153569342022-08-17 5:43:391 hr 53 mins agoENS Name killakoins.eth IN  Generative Dungeon: GENDUN Token0 Ether0.‍00034864 7.‍52797491
0xc98300895f12c0a038763853245477fb4d32095f45f31677eb4e246c61963265Set Approval For...153565712022-08-17 4:24:353 hrs 12 mins ago0xad94b8d28b6058e8f0db4d3dcc70f539ec7acafc IN  Generative Dungeon: GENDUN Token0 Ether0.‍00013743 5.‍6323103
0xa100cee690191eb1f604a12115571b0caa9943b4b12e14598b9bb80ef2aead56Set Approval For...153565662022-08-17 4:23:243 hrs 13 mins ago0xcf52402af809021bf4e485fc1bc9d97edd148439 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00020503 4.‍42706085
0x96b1c5151dc1b0fdc9183277d07ec4492bcf406d3ebb4653ef64799fd1318717Set Approval For...153565082022-08-17 4:12:053 hrs 25 mins ago0xbe99d033e30dfc3c13f1a704507fdba4d6d7524a IN  Generative Dungeon: GENDUN Token0 Ether0.‍00018138 7.‍43345678
0xf25b2ddffecefe2cb910a99748fb7a054e233ebb1d68f92bc89cddd6afc3fb50Set Approval For...153563092022-08-17 3:27:574 hrs 9 mins ago0xcedb877e0ea6806c7bba3bae5447402503d63f73 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00051553 11.‍13145311
0x8bc9ab42afcacf5d2c08f6e67836391630c3e8325f180e554248abd7d9fad527Set Approval For...153561722022-08-17 2:57:134 hrs 39 mins ago0x1433dc20d255fcf1d0e77c56ce1764c505ba126e IN  Generative Dungeon: GENDUN Token0 Ether0.‍00044234 9.‍55115489
0xfa5ec1e3c63a851fb67862b9430e23042ad0837155066b062f6d4b942c844f3eSet Approval For...153559742022-08-17 2:07:355 hrs 29 mins agoENS Name jankybum.eth IN  Generative Dungeon: GENDUN Token0 Ether0.‍00028682 6.‍19309457
0x8b8ee93ade130e9726069fbe90052efe105fa08d145553403895888433c93cdaSet Approval For...153557052022-08-17 1:02:186 hrs 34 mins ago0xdaaa26d030bb8c289c585f574555883d880dc279 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00046373 10.‍01300449
0x64241971c7045a1127af3028e82217fcbe1d1ee556916d0d6a17388218b0dd24Set Approval For...153553072022-08-16 23:33:508 hrs 3 mins ago0x00fb029f0d5e44d3098b425fc9e95b108278feba IN  Generative Dungeon: GENDUN Token0 Ether0.‍00044231 9.‍56787787
0xb6902170d2395037da3f89cbabd5e80aaad4bb14931e9f1bb2708ad6847830f2Safe Transfer Fr...153552122022-08-16 23:12:258 hrs 24 mins ago0xf242ae56395063d1f8ba8eeaf19b699c56a5d824 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00109278 12.‍63274244
0x1e1c7f1e7d336a8758948ca79b3713ec89e4a0533ca5585dcfa4450385d60f07Safe Transfer Fr...153552102022-08-16 23:11:118 hrs 25 mins ago0xf242ae56395063d1f8ba8eeaf19b699c56a5d824 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00099714 11.‍1642358
0x21310816ce1d0be76891fd72d2be8b8460719002656ef5102cbd04c372e58435Safe Transfer Fr...153552062022-08-16 23:09:268 hrs 27 mins ago0xf242ae56395063d1f8ba8eeaf19b699c56a5d824 IN  Generative Dungeon: GENDUN Token0 Ether0.‍0009033 9.‍33299702
0xfdc951bb4901396b5d28c0e5cae21fd58f2e9ec3bce71d382f136b94cae356bdSafe Transfer Fr...153552012022-08-16 23:07:398 hrs 29 mins ago0xf242ae56395063d1f8ba8eeaf19b699c56a5d824 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00078182 8.‍0758971
0x61ae2283892c22f7d5e43b14e2d97b39bae5a16957e871418400ad133bca0929Set Approval For...153549742022-08-16 22:19:269 hrs 17 mins agoENS Name chxrli3.eth IN  Generative Dungeon: GENDUN Token0 Ether0.‍00180413 38.‍95522922
0x542768d64d17e9c5ebc261d736406ecd402a9f301049ae62429d8ec2493438e6Set Approval For...153549452022-08-16 22:10:069 hrs 26 mins ago0xdd238ee51408774bce3f62750fe033828db2aa5b IN  Generative Dungeon: GENDUN Token0 Ether0.‍00052954 11.‍43406182
0xd98aad9ab6e698b6329c6ca2760197155e7c15c20e918a7a142c558a935305c0Set Approval For...153548912022-08-16 21:59:039 hrs 38 mins ago0x0ac957d69b1565614c23d5026f9df448b3ca3bc9 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00055565 12.‍01965219
0x74eb5e5039fd0a70e7557612e034ad4994496a4f3d18f057f28168a9acf1a6f4Set Approval For...153548682022-08-16 21:53:469 hrs 43 mins ago0x86e0b94c7d16a297e3310d03122005191978fd86 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00048706 18.‍44039424
0x4781795bbca87e7ae8fde152ae1e3d290afdad0c6edd810ca6d7950535e12022Safe Transfer Fr...153546242022-08-16 21:02:2410 hrs 34 mins ago0xb20e1c27dfffeb4adafd5bef7146d40e073e9791 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00133233 15.‍39981952
0x28175ed99dadebfd88c628deb6ec527f27551b908b7ac33d099387da043009cfSafe Transfer Fr...153546142022-08-16 21:00:4810 hrs 36 mins ago0xb20e1c27dfffeb4adafd5bef7146d40e073e9791 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00162534 18.‍19764597
0xebfbca1b8a5dd79e88e774c427640ad737ff6b4b010195bb2bf647e0f06afee0Safe Transfer Fr...153546092022-08-16 20:59:5310 hrs 37 mins ago0xb20e1c27dfffeb4adafd5bef7146d40e073e9791 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00204399 20.‍51996498
0x2d83a32599954bb50907df486e238155004a523df6760a8da1f2c9279079a5ccSafe Transfer Fr...153546052022-08-16 20:58:4510 hrs 38 mins ago0xb20e1c27dfffeb4adafd5bef7146d40e073e9791 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00178244 18.‍41179404
0xb787ed5b9aefc27c400a7800bb1951bf8a1f0f5a42aabb10debc3836d0d491a4Set Approval For...153543712022-08-16 20:06:0811 hrs 30 mins ago0xbcc951c95371c503d655af06f5902ac1e8f76308 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00190777 41.‍19307228
0x9bd2de8fbc223ee8c12c4e981717c6703cded385cb7e7dac927df32b48ae06ceSet Approval For...153535952022-08-16 17:10:3414 hrs 26 mins ago0x18f18a92a628e9099b604713b9674d62dbd271ba IN  Generative Dungeon: GENDUN Token0 Ether0.‍00071286 15.‍42020614
0x09cc082558a6cbedbeb256c450f4a628028f5d39ad4db5a1f979b877ef817602Set Approval For...153532742022-08-16 15:55:2415 hrs 41 mins ago0x6414b5a8c4dc6173cb345e491471708c34c3ae57 IN  Generative Dungeon: GENDUN Token0 Ether0.‍00081837 17.‍67053896
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OVERVIEW

Artwork you can play to earn. Generative Dungeon is a collection of unique, playable NFT dungeons that can be played in your browser directly on OpenSea and other marketplaces.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x0af961a9e7a78ff9adf35f9aa53d85e630460fff13ef6359c1fb79d059140f06141442552022-02-05 6:05:37193 days 1 hr ago Generative Dungeon: GENDUN TokenGenerative Dungeon: Deployer293.‍5 Ether
0x171d5e02407c8b7d9f22bebc569449f21155ac4dd6d5c5684fdf84a7fd5b3db7141418522022-02-04 20:56:12193 days 10 hrs ago 0xbf801e0bb3495993e7949d3352abfb2195073ca7 Generative Dungeon: GENDUN Token3 Ether
0xa74f786da16b8eba9f446379babbe53d8a95d4e8395871edb116cf64ca774b23141418522022-02-04 20:56:12193 days 10 hrs ago 0xbf801e0bb3495993e7949d3352abfb2195073ca7 Generative Dungeon: GENDUN Token3 Ether
0x9827ccc695b784e0eb5979e9856283cc94413c4c8d7f2b191ae1281e3b881082141418512022-02-04 20:55:51193 days 10 hrs ago 0xbf801e0bb3495993e7949d3352abfb2195073ca7 Generative Dungeon: GENDUN Token3 Ether
0xfea9819f6015ab7ca7f19bb3315eac6173513f9bc4059206e5fa81e292ae9227141418512022-02-04 20:55:51193 days 10 hrs ago 0xbf801e0bb3495993e7949d3352abfb2195073ca7 Generative Dungeon: GENDUN Token3 Ether
0x72f8a7769206be48c50433c65e90dd729d8dd6ac1ffb132bbfe88d704f3dac68141418512022-02-04 20:55:51193 days 10 hrs ago 0x874a24d01ce341b0e51073614b599079907b6d19 Generative Dungeon: GENDUN Token0.‍3 Ether
0x72f8a7769206be48c50433c65e90dd729d8dd6ac1ffb132bbfe88d704f3dac68141418512022-02-04 20:55:51193 days 10 hrs ago 0xd5df8a060887e3f4b48df2600ed7b065d801b654 Generative Dungeon: GENDUN Token0.‍3 Ether
0x72f8a7769206be48c50433c65e90dd729d8dd6ac1ffb132bbfe88d704f3dac68141418512022-02-04 20:55:51193 days 10 hrs ago 0x3dbed68ee7ef0f4905e057fdfb4511836fc5c88e Generative Dungeon: GENDUN Token0.‍3 Ether
0x72f8a7769206be48c50433c65e90dd729d8dd6ac1ffb132bbfe88d704f3dac68141418512022-02-04 20:55:51193 days 10 hrs ago 0xfa1e26c385a4b87a63f68f32eddca4e9abea734a Generative Dungeon: GENDUN Token0.‍3 Ether
0x72f8a7769206be48c50433c65e90dd729d8dd6ac1ffb132bbfe88d704f3dac68141418512022-02-04 20:55:51193 days 10 hrs ago 0x0d4cca0c4fb4c1f36cfd2197574d470585a3cb3f Generative Dungeon: GENDUN Token0.‍3 Ether
0x72f8a7769206be48c50433c65e90dd729d8dd6ac1ffb132bbfe88d704f3dac68141418512022-02-04 20:55:51193 days 10 hrs ago 0x90f75c53913b6d1a05f2e5cf39b2bf80c9c35d7d Generative Dungeon: GENDUN Token0.‍3 Ether
0x72f8a7769206be48c50433c65e90dd729d8dd6ac1ffb132bbfe88d704f3dac68141418512022-02-04 20:55:51193 days 10 hrs ago 0x3027fb9d04f927b880e1716c1732d1da61019f81 Generative Dungeon: GENDUN Token0.‍3 Ether
0xdd096c9f8bd8919b1c6debbad8f0c782da50e1c64f0a4cc1bcae125c7ad39fda141418512022-02-04 20:55:51193 days 10 hrs ago 0x60ce49f230fe32b777d4cdd7b77438ad604d9fb7 Generative Dungeon: GENDUN Token0.‍3 Ether
0xdd096c9f8bd8919b1c6debbad8f0c782da50e1c64f0a4cc1bcae125c7ad39fda141418512022-02-04 20:55:51193 days 10 hrs ago 0xbf4ecd6ff9d5c2758eeae2d61b3c0ae7dae90b36 Generative Dungeon: GENDUN Token0.‍3 Ether
0xdd096c9f8bd8919b1c6debbad8f0c782da50e1c64f0a4cc1bcae125c7ad39fda141418512022-02-04 20:55:51193 days 10 hrs ago 0xb97bd7627b669cde977d604b6dfd4657d70b0e04 Generative Dungeon: GENDUN Token0.‍3 Ether
0xdd096c9f8bd8919b1c6debbad8f0c782da50e1c64f0a4cc1bcae125c7ad39fda141418512022-02-04 20:55:51193 days 10 hrs ago 0x6bf244ed16f76062907153eac6256ba51914cb3d Generative Dungeon: GENDUN Token0.‍3 Ether
0xdd096c9f8bd8919b1c6debbad8f0c782da50e1c64f0a4cc1bcae125c7ad39fda141418512022-02-04 20:55:51193 days 10 hrs ago 0x3ddd7897b23a7d474b30fe08486090ceed14eb7a Generative Dungeon: GENDUN Token0.‍3 Ether
0xdd096c9f8bd8919b1c6debbad8f0c782da50e1c64f0a4cc1bcae125c7ad39fda141418512022-02-04 20:55:51193 days 10 hrs ago 0x348261baec65d6ef7e54c7809f081091efa21e8c Generative Dungeon: GENDUN Token0.‍3 Ether
0xdd096c9f8bd8919b1c6debbad8f0c782da50e1c64f0a4cc1bcae125c7ad39fda141418512022-02-04 20:55:51193 days 10 hrs ago 0xfa80ea81e9ebdfaf9c31bbc9ecbc169d902faec6 Generative Dungeon: GENDUN Token0.‍3 Ether
0xe599079cb70defef46d7594a2ed1d0df9f04e963b7816e4fa8d189e8520700cd141418512022-02-04 20:55:51193 days 10 hrs ago 0x70d0297de4fac4d8a055f61dcd62ef46b87bca66 Generative Dungeon: GENDUN Token0.‍3 Ether
0xe599079cb70defef46d7594a2ed1d0df9f04e963b7816e4fa8d189e8520700cd141418512022-02-04 20:55:51193 days 10 hrs ago 0xf1b73552fdbfbd48e3055ec6f164d95d8858a3b8 Generative Dungeon: GENDUN Token0.‍3 Ether
0xe599079cb70defef46d7594a2ed1d0df9f04e963b7816e4fa8d189e8520700cd141418512022-02-04 20:55:51193 days 10 hrs ago 0x405fc97d63584c3f5c8a6c98fa94dda76c5cc959 Generative Dungeon: GENDUN Token0.‍3 Ether
0xe599079cb70defef46d7594a2ed1d0df9f04e963b7816e4fa8d189e8520700cd141418512022-02-04 20:55:51193 days 10 hrs ago 0x400b1c8fdb5da1e0063050380c34cb2557bf200f Generative Dungeon: GENDUN Token0.‍3 Ether
0xe599079cb70defef46d7594a2ed1d0df9f04e963b7816e4fa8d189e8520700cd141418512022-02-04 20:55:51193 days 10 hrs ago 0x2d23a4cb0e9f40339dcdf5d201d8008db0d13b0f Generative Dungeon: GENDUN Token0.‍3 Ether
0xe599079cb70defef46d7594a2ed1d0df9f04e963b7816e4fa8d189e8520700cd141418512022-02-04 20:55:51193 days 10 hrs ago 0xdc4ec2399b5d58513421e8c56b2d583ea4f11be5 Generative Dungeon: GENDUN Token0.‍3 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
GenerativeDungeon

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-12-05
*/

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


// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

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


// OpenZeppelin Contracts v4.4.0 (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 v4.4.0 (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 Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

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


// OpenZeppelin Contracts v4.4.0 (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);
            }
        }
    }
}

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


// OpenZeppelin Contracts v4.4.0 (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 `IERC721.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 v4.4.0 (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 v4.4.0 (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 v4.4.0 (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`, 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;
}

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


// OpenZeppelin Contracts v4.4.0 (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 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);
}

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


// OpenZeppelin Contracts v4.4.0 (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 v4.4.0 (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: 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 {}
}

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


// OpenZeppelin Contracts v4.4.0 (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/GenerativeDungeon.sol



pragma solidity ^0.8.9;



/**
 * @title GenerativeDungeon contract
 * @dev Extends ERC721 Non-Fungible Token Standard basic implementation
 */
contract GenerativeDungeon is ERC721Enumerable, Ownable {
    string public NFT_PROVENANCE = "";

    string public BASE_METADATA_URI = "";
    string public CONTRACT_METADATA_URI = "";

    uint256 public startingIndexBlock;
    uint256 public startingIndex;

    uint256 public PRICE = 0.07 ether;
    uint256 public PRICE_WHITELIST = 0.05 ether;

    uint256 public MAX_NFTS_PLUS_1;

    uint256 public WALLET_LIMIT = 4; // compare will use < to save gas, so actually 3/wallet
    uint256 public WALLET_LIMIT_WHITELIST = 3; // compare will use < to save gas, so actually 2/wallet

    bool public saleIsActive = false;

    bool private locked; // for re-entrancy guard

    struct AccountInfo {
        uint256 mintedNFTs; // number of NFTs this wallet address has minted
    }

    mapping(address => AccountInfo) public accountInfoList;

    constructor() ERC721("GenerativeDungeon", "GENDUN") {
        // in max tokens, leave some space for those tokens created for giveaways after the sale, which will be minted via reserveNfts below
        MAX_NFTS_PLUS_1 = 9911; // also, to save gas during 3rd "require" in main mint below, use "plus 1" for the compare 
        BASE_METADATA_URI = "https://metadata.generativedungeon.com/"; 
        CONTRACT_METADATA_URI = "https://generativedungeon.com/storefront-metadata.json"; 
    }

    // from openzeppelin-contracts/contracts/security/ReentrancyGuard.sol
    modifier nonReentrant() {
        require(!locked, "Reentrant call");
        locked = true;
        _;
        locked = false;
    }

    // for whitelisted mint 
	modifier onlyWhitelisted(uint8 _v,
                    		bytes32 _r,
		                    bytes32 _s
	) {
		require (owner() == ecrecover(
				keccak256( abi.encodePacked('\x19Ethereum Signed Message:\n32', 
                                            keccak256( abi.encodePacked(address(this), msg.sender)))), 
                                    _v, _r, _s), 
                'Not whitelisted');
		_;
	}


    // to make OpenSea happy -  returns a URL for the storefront-level metadata 
	// https://docs.opensea.io/docs/contract-level-metadata
    function contractURI() public view returns (string memory) {
        return CONTRACT_METADATA_URI;
    }

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

    function setBaseURI(string memory _baseMetaDataURI) public onlyOwner {
        BASE_METADATA_URI = _baseMetaDataURI;
    }
    function setContractURI(string memory _contractMetaDataURI) public onlyOwner {
        CONTRACT_METADATA_URI = _contractMetaDataURI;
    }

    /*
    * in case market is volatile
    */
    function setMaxNfts(uint _maxNfts) public onlyOwner {
        MAX_NFTS_PLUS_1 = _maxNfts;
    }

    /*
    * in case Eth is volatile
    */
    function setPrice(uint256 _newPrice) public onlyOwner() {
        PRICE = _newPrice;
    }

    /*
    * in case Eth is volatile
    */
    function setPriceWhitelist(uint256 _newPrice) public onlyOwner() {
        PRICE_WHITELIST = _newPrice;
    }

    /*
     * in case we need to adjust the wallet limit 
     */
    function setWalletLimit(uint256 _newLimit) public onlyOwner() {
        WALLET_LIMIT = _newLimit;
    }

    /*
     * in case we need to adjust the wallet limit 
     */
    function setWhitelistWalletLimit(uint256 _newLimit) public onlyOwner() {
        WALLET_LIMIT_WHITELIST = _newLimit;
    }

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

    /**
     * Set some tokens aside for giveaways, etc
     */
    function reserveNfts(uint256 _amt) public onlyOwner {        
        uint256 supply = totalSupply();
        uint256 finalAmt = _amt+1;
        for (uint256 i=1; i < finalAmt; i++) { // start at Token #1
            _safeMint(msg.sender, supply+i);
        }
    }

    /* 
     * Returns all the tokenIds owned by a user in one transaction
     *
     * (backup function in case The Graph is down/unreachable)
     */
    function getNFTsByAddress(address _owner) public view returns (uint256[] memory) {
        uint256 totalItemCount = balanceOf(_owner);
        uint256[] memory tokenIds = new uint256[](totalItemCount);

        for (uint256 i; i < totalItemCount; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return tokenIds;
    }

    /*
    * Pause sale if active, make active if paused
    */
    function flipSaleState() public onlyOwner {
        saleIsActive = !saleIsActive;
    }


    /**
    * allows whitelisted addresses to mint NFTs
    */
    function mintWhitelist(uint256 _numberOfTokens, 
                            uint8 _v,
                    		bytes32 _r,
		                    bytes32 _s) public payable nonReentrant onlyWhitelisted(_v, _r, _s) {

        uint256 supply = totalSupply(); // store to save gas

        require((_numberOfTokens + accountInfoList[msg.sender].mintedNFTs) < WALLET_LIMIT_WHITELIST, "Exceeds wallet limit");

        // we hold the whitelist data off-chain and verify on-chain via onlyWhilelisted; 
        // still have to check against max nft supply in case people whitelist late
        require(supply + _numberOfTokens < MAX_NFTS_PLUS_1, "Exceeds max NFT supply"); //use < rather than <= to save gas

        require(msg.value >= PRICE_WHITELIST * _numberOfTokens, "Ether sent is not correct");
        
        _numberOfTokens++;  // +1 once for our for loop comparison here, to save gas
        for(uint256 i=1; i < _numberOfTokens; i++) { // start at Token #1 so IDs aren't zero-based
            accountInfoList[msg.sender].mintedNFTs++; // nonReentrant above prevents this from messing up
            _safeMint(msg.sender, supply+i);
        }
    }

    /**
    * Mints NFTs
    */
    function mint(uint256 _numberOfTokens) public payable nonReentrant {
        uint256 supply = totalSupply(); // store to save gas

        require(saleIsActive, "Sale paused");
        require((_numberOfTokens + accountInfoList[msg.sender].mintedNFTs) < WALLET_LIMIT, "Exceeds wallet limit");
        require(supply + _numberOfTokens < MAX_NFTS_PLUS_1, "Exceeds max NFT supply"); //use < rather than <= to save gas
        require(msg.value >= PRICE * _numberOfTokens, "Ether sent is not correct");
        
        _numberOfTokens++;  // +1 once for our for loop comparison here, to save gas
        for(uint256 i=1; i < _numberOfTokens; i++) { // start at Token #1 so IDs aren't zero-based
            accountInfoList[msg.sender].mintedNFTs++; // nonReentrant above prevents this from messing up
            _safeMint(msg.sender, supply+i);
        }

        // to save gas for minters, rather than automatically setting the starting block here, 
        // we'll manually set it by calling setStartingIndex when either 
        // 1) the last token has been sold, or 2) 9 days have passed since launch
    }

    /*
     * airdrops ignore wallet limits
     */
    function airDrop(address _addr, uint256 _numberOfTokens) public onlyOwner {
        uint256 supply = totalSupply(); // store to save gas
        require(supply + _numberOfTokens < MAX_NFTS_PLUS_1, "Exceeds max NFT supply"); //use < rather than <= to save gas

        _numberOfTokens++;  // +1 once for our for loop comparison here, to save gas
        for(uint256 i=1; i < _numberOfTokens; i++) { // start at Token #1 so IDs aren't zero-based
            _safeMint(_addr, supply+i);
        }
    }

    /**
     * Set the starting index for the collection after all tokens have sold or 9 days have passed since launch
     * we use that value to seed our deterministic random bit generator in the gaming code
     */
    function setStartingIndex() public onlyOwner {
        require(startingIndex == 0, "Starting index is already set");
        uint256 supply = totalSupply(); // store to save gas

        startingIndexBlock = block.number;

        startingIndex = uint256(blockhash(startingIndexBlock)) % supply;
        // Just a sanity case in the worst case if this function is called late (EVM only stores last 256 block hashes)
        if (block.number-startingIndexBlock > 255) {
            startingIndex = uint256(blockhash(block.number - 1)) % supply;
        }
        // Prevent default sequence
        if (startingIndex == 0) {
            startingIndex = startingIndex+1;
        }
    }

    /*     
    * Set overall provenance once it's calculated to prove we haven't touched the generated images+code
    */
    function setProvenanceHash(string memory _provenanceHash) public onlyOwner {
        NFT_PROVENANCE = _provenanceHash;
    }

}

Contract Security Audit

Contract ABI

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","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amt","type":"uint256"}],"name":"reserveNfts","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":[],"name":"saleIsActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","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":"_baseMetaDataURI","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_contractMetaDataURI","type":"string"}],"name":"setContractURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxNfts","type":"uint256"}],"name":"setMaxNfts","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newPrice","type":"uint256"}],"name":"setPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newPrice","type":"uint256"}],"name":"setPriceWhitelist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_provenanceHash","type":"string"}],"name":"setProvenanceHash","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"setStartingIndex","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newLimit","type":"uint256"}],"name":"setWalletLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newLimit","type":"uint256"}],"name":"setWhitelistWalletLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startingIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startingIndexBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":[],"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":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://667d81e5bbb7a6d5aa5fe5426cef86e36ad238a5d435a40984a67c996b625b0d
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.