Contract 0x648E8428e0104Ec7D08667866a3568a72Fe3898F 4

 
Txn Hash
Method
Block
From
To
Value
0x63377207a30ad0671d88cd27555030a00e6e750f1661c90cf9e3452b3fe682faSet Approval For...153558452022-08-17 1:36:377 hrs 4 mins ago0xd68271879bd3d957432af5d1b8a6687584c217aa IN  Dysto Apez Official: DYSTO Token0 Ether0.‍0008004 17.‍29103636
0xa2912ada7909e4b2657b865d1892ee859b39d0099f6c1a4643a0cdba5f1de03dSet Approval For...153551662022-08-16 23:00:439 hrs 40 mins agoENS Name senzat.eth IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00036028 7.‍78329434
0x533a734f75ee69e686126aad5d6637aed17fb5d2552392fe87391e4bf4e572cbSet Approval For...153550522022-08-16 22:36:4310 hrs 4 mins agoENS Name anthonyjay.eth IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00047552 10.‍27263339
0x12ffb120e8b59c4f0f952c5577ae45042750d559e49ce3f47b63d33663138d51Safe Transfer Fr...153550452022-08-16 22:35:0210 hrs 6 mins ago0x7ca28b71895ce20d66fd41d1eabae6677dbca51e IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00102072 11.‍58080777
0xc136ec47d9cd68c180094d8693b74b2fca7de2bb5feac3dc9d68fc2851cb66c0Safe Transfer Fr...153550362022-08-16 22:33:3410 hrs 7 mins ago0x6c5326e11ba87caaed6f4980a6c721b130a131ee IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00159753 15.‍17992355
0xeca5ebf4886aa274e2adca84fe37c4cf1b7e2a4379135de151b4a8068da55d3cSafe Transfer Fr...153550312022-08-16 22:32:0210 hrs 9 mins ago0x6c5326e11ba87caaed6f4980a6c721b130a131ee IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00132438 13.‍4161464
0xaca1db8c8b65143a1222907d189c257d359e2a580a86cc9f3d5f1510eb2837a9Set Approval For...153548742022-08-16 21:55:3510 hrs 45 mins agoENS Name akcam7.eth IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00077138 16.‍6642039
0x3fd705f9b19698d968b216fc4814ecb4308c6e0f0450cfeafd1f989efb3cd668Set Approval For...153534082022-08-16 16:28:0616 hrs 13 mins ago0x3b5234f45cf800c773ddcded6f8de60112efe725 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00084357 18.‍22374357
0x4eee2c5134cef7b51b93f918a0d613fda6bb6926c7e2e11557921411509e81d0Set Approval For...153533612022-08-16 16:16:1616 hrs 24 mins ago0xc3ea29da4a7bde2912c9b18e30c6d099f78c972e IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00103045 22.‍26095278
0xd2f4c9356925a6ec1db6d50a28c38552eac5ec114055b4fa975e7d414c0d8b4aSet Approval For...153533492022-08-16 16:12:1916 hrs 28 mins ago0x6b6943e356dacb5a19321a1a5dda3fcfdb8e34e0 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00122943 26.‍55946682
0x7319e57a07650742c2026eb986db14db831c553a11ff4f39d10e5865536412bcSet Approval For...153532352022-08-16 15:45:0816 hrs 56 mins ago0x9e6b64040350b60a3e922867cf99697167692328 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00065473 14.‍14411404
0x934dc54e5576ca84f0ffadad97b97ded4c71e16da60ab4a4167a52a1be7c1f9eSet Approval For...153531672022-08-16 15:29:5517 hrs 11 mins ago0x6e8c0dd97ab7070cb8fd661122d3d0532cc79d33 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00075375 16.‍28331518
0xa17b5a3ba4eac5bdb554072e8627f4ea6c2c71f3dbb569b6db5f44f8265ecfc2Set Approval For...153531182022-08-16 15:19:2217 hrs 21 mins ago0xe63a05572ffbfc67f22252bd6345416564cf64f3 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00057487 12.‍41890768
0xe97e6e68e72339d0d57f24dee744025104930047200fc0722000bbc9608c20d4Set Approval For...153528712022-08-16 14:26:0918 hrs 15 mins ago0x1407665ee916997ba7f15e29565e98c38fe41316 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00076445 16.‍51452214
0x0a2db55be87f067ddc2633e2726370f3af55eca41cc28ff41ce7b4321ebbb4a0Set Approval For...153519972022-08-16 11:05:4121 hrs 35 mins agoENS Name outsidecloser.eth IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00117821 25.‍45287298
0x7f9649d8e17ee75db9ab1dc463e10782554b60d7fcfb3bda286705766af2f51dSet Approval For...153507902022-08-16 6:33:271 day 2 hrs ago0xdbc7896d3a938199965bac54eb1804a6fb4c2e73 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00034796 14.‍32303952
0x9dbb78a51e4913a13a5b5ce6abc17612f3aa036863f97c13e33818c129a7a44bSet Approval For...153495982022-08-16 1:57:331 day 6 hrs ago0xe4d310c71ea8fec7b9d8dc4ba94eb83e86f08fff IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00055156 11.‍91537832
0x1173068937e1769cc85952d5ee7b2de8611e1dff7f226ca86b2c218f66bcd36fTransfer From153495782022-08-16 1:53:541 day 6 hrs ago0xc8ce573be4a1594158c383f695f53fecc3166a55 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00148833 12.‍74927794
0x26d500c079c640a2e93b9f9499f3f71801d3c9c3b6be2f239ef1ad57da457cd7Set Approval For...153493772022-08-16 1:09:241 day 7 hrs ago0x778754b7f910ee9093f7f7a949061853e35f596c IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00058281 12.‍5904978
0x714b0f4ddbbb99781d048775e673c8e2015f6b5b9e14b6b6d3d30ac6923004cbSet Approval For...153491852022-08-16 0:28:061 day 8 hrs agoENS Name 7amza.eth IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00052674 11.‍37918962
0x7a802cf897df825b8e2f757b781c5fcae4d106238516b2ee0fb081931fb95272Set Approval For...153487392022-08-15 22:52:401 day 9 hrs ago0x58e5981593a25ea79823aaeec437cb09c7438f0a IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00114532 24.‍74243963
0x97d70590a3b4b821af051881810e0f1d3cd3f4029fc94dc8084ee15d97c1f140Set Approval For...153485752022-08-15 22:14:231 day 10 hrs ago0x4b2426f8a66f8426cab9752c2f455e4367af94f2 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00263624 56.‍95053053
0x7a3e3ee7e2e5ac1f4e17fe6659b273afb24093d62cd829b8c93f48ed13b5027dSet Approval For...153483902022-08-15 21:33:231 day 11 hrs ago0x78272d01168dcbccd0f610df27141883f1bce7f0 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00081754 17.‍66127047
0x25071c5ad01c14881e33e6874a176c68deae9748a57a7311cf2b8a5b7b3a11c7Transfer From153480112022-08-15 20:04:001 day 12 hrs ago0x16b83c6346af6e876586683b15b9ebce3a2032ec IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00267333 22.‍90011446
0x2d1363fa9fcadbdfe939d5bafadacfa69857bee0ed2043ec3ce70282b8aca9b8Set Approval For...153480062022-08-15 20:03:311 day 12 hrs ago0x861d4d0d553ca4c316d426b12faeee95d0113d09 IN  Dysto Apez Official: DYSTO Token0 Ether0.‍00151529 32.‍73472967
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OVERVIEW

4444 Genesis Dysto Apez living on the Ethereum blockchain. $SCRAP is king in this dystopian universe with one goal in mind. Metaverse domination.

Latest 12 internal transactions
Parent Txn Hash Block From To Value
0x915e620f40f215fb4f19eeebd46db145e9c2390279717c22681c4108d272cc1b139093022021-12-30 22:06:34229 days 10 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer51.‍36 Ether
0x0c6e5e1d970036a5c8d82f28e7e8bc7b5d914e68b997f97a2513220fd3ac72e8139092902021-12-30 22:04:04229 days 10 hrs ago 0x8f79bcf8957f3fa7a83679fd1cc70183ca1b6e42 Dysto Apez Official: DYSTO Token0.‍35 Ether
0xf0f00dcc1eeba33b81cfdadfda6fe5df8f8f48bcc4bc23177982bcbf22245a7e139061852021-12-30 10:41:14229 days 21 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer15 Ether
0xc63d511a98893e6ef81b0759ae161770885e5e0d4430b8d4c1e26e36c84258f7139055262021-12-30 8:07:54230 days 33 mins ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer10.‍02 Ether
0x8ad1bd98c0da7e01839a99e5be166799e4cda52b0266e9dc5c5d4afe6dd783c8139049982021-12-30 6:03:31230 days 2 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer11.‍16 Ether
0xaaca68bfd582a4578c022a8aa77c11caccdd1c112c8f9db35629adcfda08558d139045782021-12-30 4:26:55230 days 4 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer13.‍26 Ether
0xc93335f20615abc332e8210865f1beb751c0cf445440b6f1934040db66c926aa139041442021-12-30 2:51:49230 days 5 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer16.‍02 Ether
0xd5811539e2c095ffae87437b98f8ab4ca9267e440de6d3721d38d6c1aecc89bf139038922021-12-30 1:58:26230 days 6 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer38.‍04 Ether
0x54cda094804d810397eaab1768b92ebc9a702ab064a454cbcd1e85463d52093f139033982021-12-30 0:12:10230 days 8 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer22.‍86 Ether
0x6d9745e32716a27eb870f9e6993fb94f7597eff4ac4e2602142b638a9dba6780139031032021-12-29 23:04:40230 days 9 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer23.‍82 Ether
0x4c159967dc0a12b266d13eb55f802d2f8ef8d519be71e6a63549396cfc17b814139029522021-12-29 22:30:19230 days 10 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer54.‍78 Ether
0x63db7840fb175d0a0283d820502fad737f71e12555646e8c4f8d162daddfa530138979012021-12-29 3:56:19231 days 4 hrs ago Dysto Apez Official: DYSTO TokenDysto Apez Official: Deployer0.‍47 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
DystoApez

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 10000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-12-29
*/

// File: IScrapToken.sol


/*
  _____   _____ _____ ___   _   ___ ___ ____
 |   \ \ / / __|_   _/ _ \ /_\ | _ \ __|_  /
 | |) \ V /\__ \ | || (_) / _ \|  _/ _| / /
 |___/ |_| |___/ |_| \___/_/ \_\_| |___/___|

*/

pragma solidity ^0.8.7;

interface IScrapToken {

    function updateReward(address _from, address _to, uint256 _tokenId) external;

    function getClaimableReward(address _account) external view returns(uint256);

    function claimReward() external;
}
// File: @openzeppelin/contracts/utils/Address.sol


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

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

// 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 v4.4.1 (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/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/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 v4.4.1 (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/security/Pausable.sol


// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

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


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

pragma solidity ^0.8.0;

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

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

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

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

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

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


// OpenZeppelin Contracts v4.4.1 (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.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

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

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

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


// OpenZeppelin Contracts v4.4.1 (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: DystoApez.sol


/*

  _____   _____ _____ ___   _   ___ ___ ____
 |   \ \ / / __|_   _/ _ \ /_\ | _ \ __|_  /
 | |) \ V /\__ \ | || (_) / _ \|  _/ _| / /
 |___/ |_| |___/ |_| \___/_/ \_\_| |___/___|


*/

pragma solidity ^0.8.7;







contract DystoApez is ERC721, Ownable, Pausable {
    using Strings for uint256;
    uint256 public constant MAX_SUPPLY = 4444;
    uint256 public constant MINT_PRICE = 0.06 ether;
    uint256 public constant MINT_PRICE_PUBLIC = 0.07 ether;
    uint256 public constant MAX_MINT_PER_TX = 5;
    uint256 constant public LEGENDARY_SUPPLY = 10;

    mapping(bytes32 => bool) private _usedHashes;

    bool public saleStarted = false;
    bool public preSaleStarted = false;
    bool public lock = false;
    address private _signerAddress;
    uint256 public totalSupply = 0;
    IScrapToken public scrapToken;

    string public prefixURI;
    string public commonURI;

    mapping(uint256 => string) public tokenURIs;

    constructor() ERC721("DystoApez", "DYSTO") { }

    function mintLegendary() external onlyOwner {
        require(totalSupply == 0, "MINT_ALREADY_STARTED");
        for (uint256 i = 1; i <= LEGENDARY_SUPPLY; i++) {
            _safeMint(msg.sender, totalSupply + i);
        }
        totalSupply += LEGENDARY_SUPPLY;
    }

    function mintAdmin(uint256 _count, address _account) external onlyOwner {
        require(totalSupply + _count <= MAX_SUPPLY, "MAX_SUPPLY_REACHED");
        require(totalSupply >= LEGENDARY_SUPPLY, "LEGENDARY_NOT_MINTED");
        for (uint256 i = 1; i <= _count; i++) {
            _safeMint(_account, totalSupply + i);
        }
        totalSupply += _count;
    }

    function mintWhitelist(
        uint256 _count,
        uint256 _maxCount,
        bytes memory _sig)
        external
        payable
    {
        require(preSaleStarted, "MINT_NOT_STARTED");
        require(_count > 0 && _count <= _maxCount, "COUNT_INVALID");
        require(totalSupply + _count <= MAX_SUPPLY, "MAX_SUPPLY_REACHED");
        require(totalSupply >= LEGENDARY_SUPPLY, "LEGENDARY_NOT_MINTED");
        require(msg.value == (_count * MINT_PRICE), "INVALID_ETH_SENT");

        bytes32 hash = keccak256(abi.encode(_msgSender(), _maxCount));
        require(!_usedHashes[hash], "HASH_ALREADY_USED");
        require(_matchSigner(hash, _sig), "INVALID_SIGNER");

        _usedHashes[hash] = true;
        for (uint256 i = 1; i <= _count; i++) {
            _safeMint(msg.sender, totalSupply + i);
        }
        totalSupply += _count;
    }

    function _matchSigner(bytes32 _hash, bytes memory _signature) private view returns(bool) {
        return _signerAddress == ECDSA.recover(ECDSA.toEthSignedMessageHash(_hash), _signature);
    }

    function isWhiteList(
        address _sender,
        uint256 _maxCount,
        bytes calldata _sig
    ) public view returns(bool) {
        bytes32 _hash = keccak256(abi.encode(_sender, _maxCount));
        if (!_matchSigner(_hash, _sig)) {
            return false;
        }
        if (_usedHashes[_hash]) {
            return false;
        }
        return true;
    }


    // Public Mint
    function mint(uint256 _count) public payable {
        require(saleStarted, "MINT_NOT_STARTED");
        require(_count > 0 && _count <= MAX_MINT_PER_TX, "COUNT_INVALID");
        require(totalSupply >= LEGENDARY_SUPPLY, "LEGENDARY_NOT_MINTED");
        require(totalSupply + _count <= MAX_SUPPLY, "MAX_SUPPLY_REACHED");
        require(msg.value == (_count * MINT_PRICE_PUBLIC), "INVALID_ETH_SENT");

        for (uint256 i = 1; i <= _count; i++) {
            _safeMint(msg.sender, totalSupply + i);
        }
        totalSupply += _count;
    }

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        if (bytes(tokenURIs[tokenId]).length != 0) {
            return tokenURIs[tokenId];
        }
        if (bytes(commonURI).length != 0) {
            return commonURI;
        }
        return string(abi.encodePacked(prefixURI, tokenId.toString()));
    }

    // ** Admin Fuctions ** //
    function withdraw(address payable _to) external onlyOwner {
        require(_to != address(0), "WITHDRAW_ADDRESS_ZERO");
        require(address(this).balance > 0, "EMPTY_BALANCE");
        _to.transfer(address(this).balance);
    }

    function setSaleStarted(bool _hasStarted) external onlyOwner {
        require(saleStarted != _hasStarted, "SALE_STARTED_ALREADY_SET");
        saleStarted = _hasStarted;
    }

    function setPreSaleStarted(bool _hasStarted) external onlyOwner {
        require(preSaleStarted != _hasStarted, "SALE_STARTED_ALREADY_SET");
        preSaleStarted = _hasStarted;
    }

    function setSignerAddress(address _signer) external onlyOwner {
        require(_signer != address(0), "SIGNER_ADDRESS_ZERO");
        _signerAddress = _signer;
    }

    function lockBaseURI() external onlyOwner {
        require(!lock, "ALREADY_LOCKED");
        lock = true;
    }

    function setPrefixURI(string calldata _uri) external onlyOwner {
        require(!lock, "ALREADY_LOCKED");
        prefixURI = _uri;
        commonURI = '';
    }

    function setCommonURI(string calldata _uri) external onlyOwner {
        require(!lock, "ALREADY_LOCKED");
        commonURI = _uri;
        prefixURI = '';
    }

    function setTokenURI(string calldata _uri, uint256 _tokenId) external onlyOwner {
        require(!lock, "ALREADY_LOCKED");
        tokenURIs[_tokenId] = _uri;
    }

    function setScrapToken(address _token) external onlyOwner {
        require(_token != address(scrapToken), "TOKEN_ALREADY_SET");
        require(_token != address(0), "TOKEN_ADDRESS_ZERO");
        scrapToken = IScrapToken(_token);
    }


    function pause() external onlyOwner {
        require(!paused(), "ALREADY_PAUSED");
        _pause();
    }

    function unpause() external onlyOwner {
        require(paused(), "ALREADY_UNPAUSED");
        _unpause();
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) override internal virtual {
        require(!paused(), "TRANSFER_PAUSED");
        scrapToken.updateReward(from, to, tokenId);
        super._beforeTokenTransfer(from, to, tokenId);
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://49fde380ae5136f4917fa7a7d01e3ba15e0d6c5a4a904d72d95b66a27d57c594
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.