Contract 0xebfbfd7c41b123500fb16b71c43b400c12b08be0

 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xee64e089c1f844d635c146e7c35178c4d27b52b3990b14364b6c0ec95f7bca60Set Approval For...131562912021-12-03 10:10:5256 mins ago0x4f0aa84f1ab4bea46822ce93c9dc843210a5c109 IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000228385
0xf5fc3de2d225c45c0c5e96fced2158e2cf9ec263a7573d9af68818e1cc1ac832Set Approval For...131547222021-12-03 8:50:582 hrs 16 mins ago0x010de182b4ea17b77de34d930bbf1beacdf0a7cc IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000228385
0xaf98c78cca3759315d5fb0bd3907af0bc56fe8902e6bb21b45509c66e4ea734cSet Approval For...131541482021-12-03 8:21:032 hrs 46 mins ago0x2f0cc2b84da16477056225b5a687a0f440466adc IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000228385
0xcefd8e63d906251b3d90323d0fffa97200c3b29869cbf6f741c858c0552e0c0aSet Approval For...131512822021-12-03 5:56:495 hrs 10 mins ago0x073b136b964249cb46aebdccfcf1d2a7c66f710c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000228385
0xb832bfeea981b13dfc3df34814984da24815c222a4d775a3ee7a2fb1cbe59212Transfer From131509452021-12-03 5:39:575 hrs 27 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0x3703de4602de2c9b1da87cff478e2ffd46224076a2828987e77ef7a7d10f8bffTransfer From131509422021-12-03 5:39:485 hrs 27 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0xa8fe9be00ea92a171b61677df6f4449816a665e962d5f81a612ba73165936062Transfer From131509372021-12-03 5:39:335 hrs 28 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0x9864ce0b2b8754c16a5912a837171848a877028e3609fc9bdefb74a6985bec32Transfer From131509332021-12-03 5:39:215 hrs 28 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0xe95b0eeeb8d64915017f2585ca0ee151d1bfd0832c8ac04c16ad3ca134272014Transfer From131508762021-12-03 5:36:305 hrs 31 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0x7b5f6ec555a2fc64e39c1a906ae0bea37261649682076348837439ba6dac1d35Transfer From131508682021-12-03 5:36:065 hrs 31 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0xe35445285c240fdde995050dc455e3d00a38a8509cb35e738933ba18a9c7009aTransfer From131508622021-12-03 5:35:485 hrs 31 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0xd6c1101f923aba4bf429d841eedc451d773eab6fb5041d6182adeafe26b98cf3Transfer From131508532021-12-03 5:35:215 hrs 32 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0xf1c761948cd255a5d7aa8a840c9ef2abfa9e129f06f7861beec82420b78fe3fbTransfer From131508342021-12-03 5:34:245 hrs 33 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0x8d92d606c0ee5d3cfe04eb29f370c4fa38140d903c36ba73d71af0281c86b5eaTransfer From131508112021-12-03 5:33:135 hrs 34 mins ago0x6b285c5e458f30a33dbc91169f0651bf08813feb IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.00049419
0xcabda5883a6e8e98d383536a4e05e0c4bb595c352c4a3c91068d6e2d28b65040Safe Transfer Fr...131507892021-12-03 5:32:005 hrs 35 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000353565
0x329d0caa3d18ffe0ccee92f65b3738cb90e9b33d0727a9363538b168088e02acSafe Transfer Fr...131507852021-12-03 5:31:485 hrs 35 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000409035
0x95c1959e7874b2bf6c4b091fd8f1803809b2c5694d7b97863beebeea45b5d73eSafe Transfer Fr...131507812021-12-03 5:31:345 hrs 36 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000409035
0x7908a0d08fda1f91dfbe22e79845382ea866ac4987565de44fad72a1d85d17d1Safe Transfer Fr...131507762021-12-03 5:31:165 hrs 36 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000409035
0x2247a992f8a24fb092b17b13977399102472bbac2b55d10c80f304d9baf8ad29Safe Transfer Fr...131507652021-12-03 5:30:425 hrs 36 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000409035
0xd18bce6a93b64aa75ce44afc51f059a3f76012ebfb6c0503b464c5a66b2c9886Safe Transfer Fr...131507612021-12-03 5:30:275 hrs 37 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000409035
0x27ad096855c0ecbcefdb594670cbcd73b0cc16e2f88e9b9b4ccb011d9237f8e6Safe Transfer Fr...131507572021-12-03 5:30:155 hrs 37 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000409035
0x39c415146722773c981c1af7be8e140a9b840bbab44e6f1801b5bbada8dcfbbdSafe Transfer Fr...131507542021-12-03 5:30:065 hrs 37 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000409035
0x11c55a86f27657d90c27730b1e186df8951dde71a92d46e13c1b9660f790726bSafe Transfer Fr...131507462021-12-03 5:29:395 hrs 37 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000388035
0x38c786e371cfbcc73244897f83b192e4b210b13e24ab8ed14bcf4735d727b699Safe Transfer Fr...131507382021-12-03 5:29:145 hrs 38 mins ago0x5be3b2b2b29f0d95646260fc7980e07444007e2c IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000388035
0x03da08d420bc75c5f2d8078f2a9b3e694a411ac581df304d721707775488ecccSet Approval For...131485922021-12-03 3:40:277 hrs 27 mins ago0x323f35754b81fcd338ab35dc452b134ab127a973 IN  0xebfbfd7c41b123500fb16b71c43b400c12b08be00 BNB0.000228385
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Latest 25 internal transaction
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0xcd8081e049617c0d0024833bd8044c51491ef4143e3ba75b77d979402bef909f126273742021-11-14 0:07:0919 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x249d9d2594ca341ac0e684fbceba36b69f6002b5027b6090fac154ac11f1bde0126273732021-11-14 0:07:0619 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x11e16886de4caa330ab35f4e1b8bbabf209440f58757beb86344513e170f332a126273692021-11-14 0:06:5419 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.314 BNB
0xa6bbd6082bea8ef8ec9eac304100987cfb5ea78773a6ee1112b275dd88248546126273622021-11-14 0:06:3319 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x5c3bf8137ed9ee17f26de1ffc2caced1ef20c6f92da2c72f3c7fee64da021497126273552021-11-14 0:06:1219 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x43c5f4bb597e8615d186bf7ec188053c95e34bb08198d8c35f07f71e3301b67f126273522021-11-14 0:06:0319 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x30dbed4e3b12860f5c6108efce28f1da574e1d34a68a74a1842d5903273d01e9126273472021-11-14 0:05:4819 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0xcb3e0fbf7e4116d11150772c2a8b03d57cea32358f98b913a1dab76c8583b1f9126273412021-11-14 0:05:3019 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x7f1513f7f529b9cf965dfcbab5ffc1a01c5da232046d7a740881785d1c4d502e126273362021-11-14 0:05:1519 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x244dc6a6312e9c2121dd30c47f3ea424069189ec9c7d9ad52886c5d17f1342b3126273082021-11-14 0:03:5119 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x24178d61dd70298628a2062d745bc92185eeaa7dc3d7b1fb04febf29e7aa4dad126273022021-11-14 0:03:3319 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x832c536c920310c15484f328df32691f8410668310c49efde316b1f6a33aee16126272892021-11-14 0:02:5419 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x33008700576afb6744ebd12e65167096aeb2fcacf9df9d7a3d1344fd07a8f01c126272862021-11-14 0:02:4519 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x422b6fb46776c495ddbe10dadb5699e9410e79b6b6bfc916b10d6f322a9f6bc0126272732021-11-14 0:02:0619 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x0945440bc10b62c6bca9e962582a62341ed5aa1b16057e81de029752d9af5f92126272612021-11-14 0:01:3019 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x31301f43fe1ccf5c401182955939279e8aa035ba23a0199d905c359069fb0ec6126272512021-11-14 0:01:0019 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.942 BNB
0x0d3fdb101cf9c50a7c8de41dfffbda539d98b3a5b4b411ac3a2bf7927625b56d126272472021-11-14 0:00:4819 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x19aa85b6bcf9cace66f2eb58b6ab01eb3ac5008f687c8a9a5a975ab2a174d02f126272322021-11-14 0:00:0319 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da31.413 BNB
0x0bf09fde50b9e589113ac05d4cbfd039c1ec2d527347832ae3483b47e5d35900126272272021-11-13 23:59:4819 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x57b84d0274dd16acb2706a5a5c08c1947ae167aa5fe045ff19b0f531078f2ad8126272242021-11-13 23:59:3919 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x321c9e44226e569c8d83738a5b7aedcf465f549fd76524ff8690ff20ebeb2cc0126272212021-11-13 23:59:3019 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x8d72552a04ae5b16fa22054d025eca3540ee05a15ad8b11bb30897835d8adb83126272162021-11-13 23:59:1519 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x6f3e02e87f23ae186b28a91f1431b4ef6394f1aa98d0c3f950878565b3f06bd9126272112021-11-13 23:59:0019 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0x7a246e7e91e62aea1a00820035e31f69425340f0bc68f28fa9216f3f3171f41b126272062021-11-13 23:58:4519 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
0xf4213ebf5f4a780b70d0ea72e9e8db3abf3d26af42bd3744f42bafd85848dddf126271962021-11-13 23:58:1519 days 11 hrs ago 0xebfbfd7c41b123500fb16b71c43b400c12b08be00x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da30.471 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
MonstaPartyNFTv2

Compiler Version
v0.8.0+commit.c7dfd78e

Optimization Enabled:
Yes with 1 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-11-10
*/

// Sources flattened with hardhat v2.1.1 https://hardhat.org

// File @openzeppelin/contracts/utils/introspection/[email protected]

// SPDX-License-Identifier: MIT

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/token/ERC721/[email protected]





/**
 * @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/[email protected]





/**
 * @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/token/ERC721/extensions/[email protected]





/**
 * @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/[email protected]





/**
 * @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/utils/[email protected]





/**
 * @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/utils/[email protected]





/**
 * @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/introspection/[email protected]





/**
 * @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/[email protected]











/**
 * @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 {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_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 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/[email protected]





/**
 * @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/[email protected]






/**
 * @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 @openzeppelin/contracts/token/ERC721/extensions/[email protected]






/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be irreversibly burned (destroyed).
 */
abstract contract ERC721Burnable is Context, ERC721 {
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
        _burn(tokenId);
    }
}


// File @openzeppelin/contracts/access/[email protected]





/**
 * @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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


// File @openzeppelin/contracts/utils/math/[email protected]





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

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

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

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

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

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

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

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

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

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

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

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

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

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


// File @chainlink/contracts/src/v0.8/interfaces/[email protected]




interface LinkTokenInterface {

  function allowance(
    address owner,
    address spender
  )
    external
    view
    returns (
      uint256 remaining
    );

  function approve(
    address spender,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function balanceOf(
    address owner
  )
    external
    view
    returns (
      uint256 balance
    );

  function decimals()
    external
    view
    returns (
      uint8 decimalPlaces
    );

  function decreaseApproval(
    address spender,
    uint256 addedValue
  )
    external
    returns (
      bool success
    );

  function increaseApproval(
    address spender,
    uint256 subtractedValue
  ) external;

  function name()
    external
    view
    returns (
      string memory tokenName
    );

  function symbol()
    external
    view
    returns (
      string memory tokenSymbol
    );

  function totalSupply()
    external
    view
    returns (
      uint256 totalTokensIssued
    );

  function transfer(
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  )
    external
    returns (
      bool success
    );

  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

}


// File @chainlink/contracts/src/v0.8/[email protected]




contract VRFRequestIDBase {

  /**
   * @notice returns the seed which is actually input to the VRF coordinator
   *
   * @dev To prevent repetition of VRF output due to repetition of the
   * @dev user-supplied seed, that seed is combined in a hash with the
   * @dev user-specific nonce, and the address of the consuming contract. The
   * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in
   * @dev the final seed, but the nonce does protect against repetition in
   * @dev requests which are included in a single block.
   *
   * @param _userSeed VRF seed input provided by user
   * @param _requester Address of the requesting contract
   * @param _nonce User-specific nonce at the time of the request
   */
  function makeVRFInputSeed(
    bytes32 _keyHash,
    uint256 _userSeed,
    address _requester,
    uint256 _nonce
  )
    internal
    pure
    returns (
      uint256
    )
  {
    return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce)));
  }

  /**
   * @notice Returns the id for this request
   * @param _keyHash The serviceAgreement ID to be used for this request
   * @param _vRFInputSeed The seed to be passed directly to the VRF
   * @return The id for this request
   *
   * @dev Note that _vRFInputSeed is not the seed passed by the consuming
   * @dev contract, but the one generated by makeVRFInputSeed
   */
  function makeRequestId(
    bytes32 _keyHash,
    uint256 _vRFInputSeed
  )
    internal
    pure
    returns (
      bytes32
    )
  {
    return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed));
  }
}


// File @chainlink/contracts/src/v0.8/[email protected]




/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator, _link) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash), and have told you the minimum LINK
 * @dev price for VRF service. Make sure your contract has sufficient LINK, and
 * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you
 * @dev want to generate randomness from.
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomness method.
 *
 * @dev The randomness argument to fulfillRandomness is the actual random value
 * @dev generated from your seed.
 *
 * @dev The requestId argument is generated from the keyHash and the seed by
 * @dev makeRequestId(keyHash, seed). If your contract could have concurrent
 * @dev requests open, you can use the requestId to track which seed is
 * @dev associated with which randomness. See VRFRequestIDBase.sol for more
 * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.)
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ. (Which is critical to making unpredictable randomness! See the
 * @dev next section.)
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the ultimate input to the VRF is mixed with the block hash of the
 * @dev block in which the request is made, user-provided seeds have no impact
 * @dev on its economic security properties. They are only included for API
 * @dev compatability with previous versions of this contract.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request.
 */
abstract contract VRFConsumerBase is VRFRequestIDBase {

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBase expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomness the VRF output
   */
  function fulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    internal
    virtual;

  /**
   * @dev In order to keep backwards compatibility we have kept the user
   * seed field around. We remove the use of it because given that the blockhash
   * enters later, it overrides whatever randomness the used seed provides.
   * Given that it adds no security, and can easily lead to misunderstandings,
   * we have removed it from usage and can now provide a simpler API.
   */
  uint256 constant private USER_SEED_PLACEHOLDER = 0;

  /**
   * @notice requestRandomness initiates a request for VRF output given _seed
   *
   * @dev The fulfillRandomness method receives the output, once it's provided
   * @dev by the Oracle, and verified by the vrfCoordinator.
   *
   * @dev The _keyHash must already be registered with the VRFCoordinator, and
   * @dev the _fee must exceed the fee specified during registration of the
   * @dev _keyHash.
   *
   * @dev The _seed parameter is vestigial, and is kept only for API
   * @dev compatibility with older versions. It can't *hurt* to mix in some of
   * @dev your own randomness, here, but it's not necessary because the VRF
   * @dev oracle will mix the hash of the block containing your request into the
   * @dev VRF seed it ultimately uses.
   *
   * @param _keyHash ID of public key against which randomness is generated
   * @param _fee The amount of LINK to send with the request
   *
   * @return requestId unique ID for this request
   *
   * @dev The returned requestId can be used to distinguish responses to
   * @dev concurrent requests. It is passed as the first argument to
   * @dev fulfillRandomness.
   */
  function requestRandomness(
    bytes32 _keyHash,
    uint256 _fee
  )
    internal
    returns (
      bytes32 requestId
    )
  {
    LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER));
    // This is the seed passed to VRFCoordinator. The oracle will mix this with
    // the hash of the block containing this request to obtain the seed/input
    // which is finally passed to the VRF cryptographic machinery.
    uint256 vRFSeed  = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]);
    // nonces[_keyHash] must stay in sync with
    // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above
    // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest).
    // This provides protection against the user repeating their input seed,
    // which would result in a predictable/duplicate output, if multiple such
    // requests appeared in the same block.
    nonces[_keyHash] = nonces[_keyHash] + 1;
    return makeRequestId(_keyHash, vRFSeed);
  }

  LinkTokenInterface immutable internal LINK;
  address immutable private vrfCoordinator;

  // Nonces for each VRF key from which randomness has been requested.
  //
  // Must stay in sync with VRFCoordinator[_keyHash][this]
  mapping(bytes32 /* keyHash */ => uint256 /* nonce */) private nonces;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   * @param _link address of LINK token contract
   *
   * @dev https://docs.chain.link/docs/link-token-contracts
   */
  constructor(
    address _vrfCoordinator,
    address _link
  ) {
    vrfCoordinator = _vrfCoordinator;
    LINK = LinkTokenInterface(_link);
  }

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    external
  {
    require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill");
    fulfillRandomness(requestId, randomness);
  }
}


// File contracts/ERC2981/IERC2981Royalties.sol




/// @title IERC2981Royalties
/// @dev Interface for the ERC2981 - Token Royalty standard
interface IERC2981Royalties {
  /// @notice Called with the sale price to determine how much royalty
  //          is owed and to whom.
  /// @param _tokenId - the NFT asset queried for royalty information
  /// @param _value - the sale price of the NFT asset specified by _tokenId
  /// @return _receiver - address of who should be sent the royalty payment
  /// @return _royaltyAmount - the royalty payment amount for value sale price
  function royaltyInfo(uint256 _tokenId, uint256 _value)
    external
    view
    returns (address _receiver, uint256 _royaltyAmount);
}


// File contracts/ERC2981/ERC2981Base.sol




/// @dev This is a contract used to add ERC2981 support to ERC721 and 1155
abstract contract ERC2981Base is ERC165, IERC2981Royalties {
  struct RoyaltyInfo {
    address recipient;
    uint24 amount;
  }

  /// @inheritdoc	ERC165
  function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
    return
      interfaceId == type(IERC2981Royalties).interfaceId || super.supportsInterface(interfaceId);
  }
}


// File contracts/ERC2981/ERC2981ContractWideRoyalties.sol




/// @dev This is a contract used to add ERC2981 support to ERC721 and 1155
/// @dev This implementation has the same royalties for each and every tokens
abstract contract ERC2981ContractWideRoyalties is ERC2981Base {
  RoyaltyInfo private _royalties;

  /// @dev Sets token royalties
  /// @param recipient recipient of the royalties
  /// @param value percentage (using 2 decimals - 10000 = 100, 0 = 0)
  function _setRoyalties(address recipient, uint256 value) internal {
    require(value <= 10000, 'ERC2981Royalties: Too high');
    _royalties = RoyaltyInfo(recipient, uint24(value));
  }

  /// @inheritdoc	IERC2981Royalties
  function royaltyInfo(uint256, uint256 value)
    external
    view
    override
    returns (address receiver, uint256 royaltyAmount)
  {
    RoyaltyInfo memory royalties = _royalties;
    receiver = royalties.recipient;
    royaltyAmount = (value * royalties.amount) / 10000;
  }
}


// File contracts/MonstaPartyNFTv2.sol




/***
 * Monsta Party is a collection of 10,000 Play-2-Earn NFTs backed by the "Cake Monster" DeFi protocol.
 *
 * https://monsta.party
 *
 ***/





interface IMonstaPartyP2E {
  function canBuy(
    address minter,
    uint256 mintAmount,
    uint256 bnbValue
  ) external view returns (bool allow, string memory reason);
}

interface IERC20 {
  function balanceOf(address account) external view returns (uint256);

  function transfer(address recipient, uint256 amount) external returns (bool);
}

struct MintRequest {
  address mintAddress;
  uint256 amount;
  bool fulfilled;
}

contract MonstaPartyNFTv2 is
  ERC721,
  ERC721Enumerable,
  ERC721Burnable,
  Ownable,
  VRFConsumerBase,
  ERC2981ContractWideRoyalties
{
  /* PUBLIC */

  address public ADDRESS_MONSTA_PARTY_P2E;
  address public ADDRESS_MONSTA_PARTY_MIGRATOR;
  address public ADDRESS_MK_DEV;

  bool public manageable = true;

  string public baseURI;

  uint256 public minted = 0;
  uint256 public mintRequests = 0;

  mapping(uint256 => uint256) public randoms;
  mapping(address => uint256) public requests;
  mapping(uint256 => uint256) public hatchTimes;

  uint256 constant MAX_TOKENS = 10000;

  mapping(uint256 => uint256) public indices;
  mapping(bytes32 => MintRequest) public minters;

  /* PRIVATE */

  bytes32 private s_keyHash;
  uint256 private s_fee;

  bytes4 private constant _INTERFACE_ID_ERC721ROYALTIES = 0x263d4ef1;

  /* CONSTRUCTOR */

  constructor(
    address vrfCoordinator,
    address link,
    bytes32 keyHash,
    uint256 fee,
    address _ADDRESS_MK_DEV
  ) ERC721('Monsta Party', 'MPNFT') VRFConsumerBase(vrfCoordinator, link) {
    s_keyHash = keyHash;
    s_fee = fee;

    ADDRESS_MK_DEV = _ADDRESS_MK_DEV;

    _setRoyalties(_ADDRESS_MK_DEV, 1000);
  }

  /** ONLY OWNER */

  function setBaseURI(string memory uri) external onlyOwner {
    require(manageable, 'Contract is locked');

    baseURI = uri;
  }

  function disableManaging() external onlyOwner {
    require(manageable, 'Contract is locked');

    manageable = false;
  }

  function setP2E(address _ADDRESS_MONSTA_PARTY_P2E) external onlyOwner {
    require(manageable, 'Contract is locked');

    ADDRESS_MONSTA_PARTY_P2E = _ADDRESS_MONSTA_PARTY_P2E;
  }

  function setMigrator(address _ADDRESS_MONSTA_PARTY_MIGRATOR) external onlyOwner {
    require(manageable, 'Contract is locked');

    ADDRESS_MONSTA_PARTY_MIGRATOR = _ADDRESS_MONSTA_PARTY_MIGRATOR;
  }

  function setRoyalties(address recipient, uint256 value) external onlyOwner {
    require(value <= 2000, 'Royalty percentage too high');

    _setRoyalties(recipient, value);
  }

  // Allow withdrawal of stuck tokens
  function withdrawTokens(address _tokenAddress) external onlyOwner {
    uint256 amount = IERC20(_tokenAddress).balanceOf(address(this));

    IERC20(_tokenAddress).transfer(owner(), amount);
  }

  function migrateMint(
    address to,
    uint256 tokenId,
    uint256 random,
    uint256 hatchTime
  ) external {
    require(manageable, 'Contract is locked');
    require(_msgSender() == ADDRESS_MONSTA_PARTY_MIGRATOR, 'Access denied');
    require(minted < MAX_TOKENS, 'Mint limit reached');

    mintRequests++;
    requests[to]++;
    randoms[tokenId] = random;
    hatchTimes[tokenId] = hatchTime;

    minted++;

    setRandomTokenId(tokenId);

    _safeMint(to, tokenId);
  }

  function migrateRequest(address to, uint256 mintAmount) external {
    require(manageable, 'Contract is locked');
    require(_msgSender() == ADDRESS_MONSTA_PARTY_MIGRATOR, 'Access denied');
    require(mintRequests < MAX_TOKENS, 'Mint limit reached');
    require(mintRequests + mintAmount <= MAX_TOKENS, 'Amount exceeds mint limit');
    require(LINK.balanceOf(address(this)) >= s_fee, 'Not enough LINK to pay fee');

    if (mintAmount > 3) {
      require(LINK.balanceOf(address(this)) >= s_fee * 2, 'Not enough LINK to pay fee');

      bytes32 requestId1 = requestRandomness(s_keyHash, s_fee);
      minters[requestId1] = MintRequest({ mintAddress: to, amount: 3, fulfilled: false });

      bytes32 requestId2 = requestRandomness(s_keyHash, s_fee);
      minters[requestId2] = MintRequest({
        mintAddress: to,
        amount: mintAmount - 3,
        fulfilled: false
      });
    } else {
      bytes32 requestId = requestRandomness(s_keyHash, s_fee);
      minters[requestId] = MintRequest({ mintAddress: to, amount: mintAmount, fulfilled: false });
    }

    mintRequests += mintAmount;
    requests[_msgSender()] += mintAmount;
  }

  /** PUBLIC  */
  function buy(uint256 mintAmount) external payable {
    require(mintRequests < MAX_TOKENS, 'Mint limit reached');
    require(mintRequests + mintAmount <= MAX_TOKENS, 'Amount exceeds mint limit');
    require(mintAmount > 0 && mintAmount < 4, 'Invalid mint amount');
    require(LINK.balanceOf(address(this)) >= s_fee, 'Not enough LINK to pay fee');

    (bool allow, string memory reason) = IMonstaPartyP2E(ADDRESS_MONSTA_PARTY_P2E).canBuy(
      _msgSender(),
      mintAmount,
      msg.value
    );

    require(allow, reason);

    bytes32 requestId = requestRandomness(s_keyHash, s_fee);

    minters[requestId] = MintRequest({
      mintAddress: _msgSender(),
      amount: mintAmount,
      fulfilled: false
    });

    // Send BNB to MK/DEV
    (bool success, ) = ADDRESS_MK_DEV.call{ value: msg.value }('');

    require(success, 'Failed to send BNB');

    mintRequests += mintAmount;
    requests[_msgSender()] += mintAmount;
  }

  function getRandom(uint256 tokenId) external view returns (uint256) {
    return randoms[tokenId];
  }

  function getHatchTime(uint256 tokenId) external view returns (uint256) {
    return hatchTimes[tokenId];
  }

  function getRequestCount(address minter) external view returns (uint256) {
    return requests[minter];
  }

  /** PRIVATE/INTERNAL/OVERRIDES **/

  function fulfillRandomness(bytes32 requestId, uint256 randomness) internal override {
    MintRequest storage minter = minters[requestId];

    require(minted + minter.amount <= MAX_TOKENS, 'Mint limit reached');
    require(!minter.fulfilled, 'Request already fulfilled');

    for (uint256 i = 0; i < minter.amount; i++) {
      uint256 rnd = uint256(keccak256(abi.encode(randomness, i)));
      uint256 tokenId = getRandomTokenId(rnd);

      require(tokenId < MAX_TOKENS, 'Invalid tokenId');

      _safeMint(minter.mintAddress, tokenId);

      randoms[tokenId] = rnd;
      hatchTimes[tokenId] = block.timestamp + ((rnd % (107)) * 1 hours);

      minted++;
    }

    minter.fulfilled = true;
  }

  function getRandomTokenId(uint256 random) private returns (uint256) {
    uint256 totalSize = MAX_TOKENS - minted;
    uint256 index = random % totalSize;
    uint256 tokenId;

    if (indices[index] == 0) {
      tokenId = index;
    } else {
      tokenId = indices[index];
    }

    if (indices[totalSize - 1] == 0) {
      indices[index] = totalSize - 1;
    } else {
      indices[index] = indices[totalSize - 1];
    }

    return tokenId;
  }

  function setRandomTokenId(uint256 tokenId) private {
    uint256 totalSize = MAX_TOKENS - minted;

    require(indices[tokenId] == 0, 'Indices should be 0');

    if (indices[totalSize - 1] == 0) {
      indices[tokenId] = totalSize - 1;
    } else {
      indices[tokenId] = indices[totalSize - 1];
    }
  }

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

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

  function supportsInterface(bytes4 interfaceId)
    public
    view
    override(ERC721, ERC721Enumerable, ERC2981Base)
    returns (bool)
  {
    return super.supportsInterface(interfaceId);
  }
}

Contract Security Audit

Contract ABI

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

000000000000000000000000747973a5a2a4ae1d3a8fdf5479f1514f65db9c31000000000000000000000000404460c6a5ede2d891e8297795264fde62adbb75c251acd21ec4fb7f31bb8868288bfdbaeb4fbfec2df3735ddbd4f7dc8d60103c00000000000000000000000000000000000000000000000002c68af0bb14000000000000000000000000000000a10b1adb5a5a3635c5fdc6adb654a71f3f5da3

-----Decoded View---------------
Arg [0] : vrfCoordinator (address): 0x747973a5a2a4ae1d3a8fdf5479f1514f65db9c31
Arg [1] : link (address): 0x404460c6a5ede2d891e8297795264fde62adbb75
Arg [2] : keyHash (bytes32): 0xc251acd21ec4fb7f31bb8868288bfdbaeb4fbfec2df3735ddbd4f7dc8d60103c
Arg [3] : fee (uint256): 200000000000000000
Arg [4] : _ADDRESS_MK_DEV (address): 0x00a10b1adb5a5a3635c5fdc6adb654a71f3f5da3

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000747973a5a2a4ae1d3a8fdf5479f1514f65db9c31
Arg [1] : 000000000000000000000000404460c6a5ede2d891e8297795264fde62adbb75
Arg [2] : c251acd21ec4fb7f31bb8868288bfdbaeb4fbfec2df3735ddbd4f7dc8d60103c
Arg [3] : 00000000000000000000000000000000000000000000000002c68af0bb140000
Arg [4] : 00000000000000000000000000a10b1adb5a5a3635c5fdc6adb654a71f3f5da3


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://e4b5bb78ceb6accd42c00c7349464fe6cb63d9c918a3a4add724f50b4f1bc80a
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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