Contract 0xa2DbD9e7e2969db08B6A8C6cbC9D002663E70147 2

 
Txn Hash
Method
Block
From
To
Value
0x6d7e3e8992ce6da710b97334de3f053b8bf88afc7b49f7cc1268b1f80e8cf397Set Approval For...152323862022-07-28 17:38:0513 days 20 hrs ago0xa655335b71c6db61d81991c5e6076a59d8d6660a IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00083479 31.‍1085922
0x8d178d7077e8e530c28587ae32317df6cc0e27cd38d7c2afa05dddfa746faf3aSet Approval For...152323852022-07-28 17:36:2613 days 20 hrs ago0xa655335b71c6db61d81991c5e6076a59d8d6660a IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00130531 27.‍93021086
0xfaa2b930c829f319432cff5c5b8a27e4f7762be4bedf6b90d4be0fbad61bbf3eSet Approval For...152078102022-07-24 21:44:5617 days 16 hrs agoENS Name cryptotaku.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00038674 8.‍28797546
0x1d708423064286248a9c2ea88b8e2d421b409fecc50eadb33da0de96bc1c13b9Set Approval For...151771872022-07-20 3:41:5322 days 10 hrs ago0x4090748e91d07e43ba44efb6613ef9004b4ab25c IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00069999 14.‍97421636
0xbf555aaaa8f8ccc857bb20a9ab1b000b4d92253e031cbd6da9dfda1b53049935Set Approval For...150088742022-06-22 18:05:0149 days 20 hrs ago0x71180189b226b2e4019afe1633346b7c98c3d163 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00239469 51.‍31889251
0x4000f9d7de6229f569ee41e181f27fb088f1ddce3a988a29b6c368bece827705Set Approval For...150058982022-06-22 4:51:4250 days 9 hrs ago0xaaedd6ed3c301d3985d5edd4f0e548d69d94dbe3 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00134857 28.‍85576795
0xc3d3656031af49bd51a93da767fb7340e4f656c446839873ca6f1951c5fecdb9Transfer From145494912022-04-09 4:47:25124 days 9 hrs ago0x2bc80f227d1a01264b55bdf9b1e76f0d1cef4850 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00354174 40.‍63267301
0x5f72232cd9b25ffc14a7ca356bc19d6eaed80a95536ad2fc10e8126f1ae41529Set Approval For...145214532022-04-04 19:41:56128 days 18 hrs agoENS Name pumkin.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00236841 50.‍66445466
0x726ccf0eaa0baeb9bb4c83cce96ac84d54bc8d743049ed0dd1e151aae41d7f3fSet Approval For...143222332022-03-04 18:49:22159 days 19 hrs agoENS Name godsm.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00179391 38.‍37504021
0x65c11729a62cf922f6d59d6c90f50dd4c556c54829a371efc840af11be4f52beSet Approval For...142293972022-02-18 9:59:47174 days 4 hrs ago0xaaedd6ed3c301d3985d5edd4f0e548d69d94dbe3 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00442692 94.‍69968339
0x2a92e16d999d8c3db92894aa7d80f7c5406a232fdb6827eef610312c9518cb4dSet Approval For...142248342022-02-17 16:57:25174 days 21 hrs agoENS Name rohshambo.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00229626 49.‍12113783
0xa9ba004ce056f46739a0a0d89263dc362db8facec8908647f08c21bbe31711a2Set Approval For...142235422022-02-17 12:05:07175 days 2 hrs ago0xa48ddadde4a32da2b185bffafb54c94642655e64 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00227097 48.‍58006676
0x3fad555927ed72f66c238e7cdede1fad9f5e6e6679c065d0ddf7c27011466462Set Approval For...142204082022-02-17 0:31:59175 days 13 hrs ago0x82629d45b413afbae1f488968ec1143a663227c2 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00279181 59.‍72182998
0xfb6892ffa101c9f4e83babbb18a34919153afcd8346dcee6c929f4fc70015821Set Approval For...142166912022-02-16 10:51:45176 days 3 hrs ago0x765eb49301d502cb077b677f42e0cdc8f9537274 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00192257 41.‍12732587
0x55e4e5f027dd4d348f816136bd286968639bd0811931d59f47572fa759e601b1Set Approval For...142166132022-02-16 10:34:48176 days 3 hrs agoENS Name trademarc.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00226836 48.‍52422461
0x6bb374d66cba3b6c7fc746058ac7efbc230f0115e7e00543d086146781aa874eSet Approval For...142162072022-02-16 9:01:02176 days 5 hrs ago0x48150ffbd42a7195e29cd65940a63653bcb529c1 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍0021576 46.‍15491666
0xba5d04e9a137366a100797112a5a276a945e8fc6f8137440c10ac983f73b93a6Set Approval For...142141212022-02-16 1:00:55176 days 13 hrs agoENS Name ttvwraith.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00547468 117.‍11317286
0x1bc30ea008216acac59d68fa3b190a723cf84a2b85ff38dc0c6d091878119c87Set Approval For...142140702022-02-16 0:51:21176 days 13 hrs agoENS Name crimsbot.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00724578155
0x27247a47263e7166f142450142c7d65878374c3d4ce5b8d0f122c05465c42751Set Approval For...142140262022-02-16 0:42:08176 days 13 hrs agoENS Name socious.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00804977 172.‍19875159
0xc004a621f79b1d0055733308786aa861856e955c063855f570e2aad8fa928ab0Set Approval For...142137482022-02-15 23:37:58176 days 14 hrs agoENS Name sammydsalmon.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00393801 84.‍24098162
0xb1c73e3dda150a6e2b39d15056e721cf2912ab097f0e823959ac05314263afd4Set Approval For...142135852022-02-15 23:03:41176 days 15 hrs agoENS Name *🤷.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00530982 113.‍58649468
0xed7a2f957628368b81e1636a7e8dac20237dc213f8d36332c5060ed8cbc7371aSet Approval For...142135812022-02-15 23:02:30176 days 15 hrs agoENS Name papaclarky.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00509734 109.‍04117322
0x91ee3a09cb589f60e364f8ecee759d2703e4c98e22c7c9ccf69b02dd30ce2142Set Approval For...139991642022-01-13 19:57:50209 days 18 hrs ago0x253a1e3f78e0966956b75ec32bd4a52b9a564cfc IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00611174 130.‍74099464
0xc143f5049f971c550746d28dda040a3c969645e1efc8ce1e59ec502cb57e2410Set Approval For...139956122022-01-13 6:39:34210 days 7 hrs ago0xfbdd3db5aa4c0fd5629789a4c570cc19bc68f795 IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍0057775 123.‍59099057
0x19a3d4a6d934cc1d4f344548319b87bb58fe16cd3e52c97abf1526bfe8fa725fSet Approval For...139888092022-01-12 5:18:11211 days 9 hrs agoENS Name tatsuni.eth IN 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470 Ether0.‍00894624 191.‍37590374
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Latest 25 internal transaction
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0xf51e9e1ae3d39c24f5d8977f3baa73293ab345ea288a1aa3a368f48520c6d4c4131286992021-08-30 19:12:21345 days 19 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xc13081bb2d16d83a7e839a575e8ef6b34e028da81.‍62 Ether
0x0567b02e001a2bf2cea43fb5d9bd9949f50fbaa6c180f34b325ec178655c5420131088262021-08-27 17:32:07348 days 20 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x2f605a73133e7f27d30b176de378f0d24638a1370.‍0855 Ether
0x5dff8ae6a14b4574a6789375201ed562a2321cb9770b32653bbb1ac1d08a2796131088112021-08-27 17:29:56348 days 20 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xd1b9ffcae0f24e2919e9dbc76538b2fac7f8d5e20.‍0855 Ether
0x5dff8ae6a14b4574a6789375201ed562a2321cb9770b32653bbb1ac1d08a2796131088112021-08-27 17:29:56348 days 20 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x49acaea16ad70df840a293be694b58259a4afac06b8c71097f6cf969c543d1f3131086622021-08-27 16:55:21348 days 21 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x77d74a7611db43241e25c65888e6a26fa69019a10.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xa29e5482cbe29f396827c9f1cdc492f821b92ffc0.‍0855 Ether
0x264d58ffc2a809c77106fbaa3d644892591f7f084e576cbf09b333207971158c131084302021-08-27 16:12:01348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xa29e5482cbe29f396827c9f1cdc492f821b92ffc0.‍0855 Ether
0xcfa3a967d217c062e115fc117fa1494592da88f50f9dae072d552ddef7031336131084282021-08-27 16:11:27348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xa29e5482cbe29f396827c9f1cdc492f821b92ffc0.‍0855 Ether
0xcfa3a967d217c062e115fc117fa1494592da88f50f9dae072d552ddef7031336131084282021-08-27 16:11:27348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xa29e5482cbe29f396827c9f1cdc492f821b92ffc0.‍0855 Ether
0xd911900ee82eb08caf558ee178a86f0a9b5e4ee1334f60032e86f78ae3d67055131083502021-08-27 15:57:44348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xa29e5482cbe29f396827c9f1cdc492f821b92ffc0.‍0855 Ether
0xd911900ee82eb08caf558ee178a86f0a9b5e4ee1334f60032e86f78ae3d67055131083502021-08-27 15:57:44348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xbd2619d58dc96449dc5126ada71ec249cd1794da0.‍0855 Ether
0x440429fa6686156a79e7221cf7023ac010c5378ccf951a786c9930ddad1ff521131083472021-08-27 15:57:24348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470xbd2619d58dc96449dc5126ada71ec249cd1794da0.‍0855 Ether
0xc739d59765dbd11133378acc6a16bfaf593b6cb5d0ccbbb6827fc5509becc6f1131082632021-08-27 15:37:03348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x9928169569b3f4ce25a2dfac7306cb6b9f2df6c00.‍0855 Ether
0xc739d59765dbd11133378acc6a16bfaf593b6cb5d0ccbbb6827fc5509becc6f1131082632021-08-27 15:37:03348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x9928169569b3f4ce25a2dfac7306cb6b9f2df6c00.‍0855 Ether
0xc739d59765dbd11133378acc6a16bfaf593b6cb5d0ccbbb6827fc5509becc6f1131082632021-08-27 15:37:03348 days 22 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x9928169569b3f4ce25a2dfac7306cb6b9f2df6c00.‍0855 Ether
0x549da5747518a31ffa91d1142ead07861f9993faca30314f90957a9cc61574e6131081382021-08-27 15:08:31348 days 23 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x9928169569b3f4ce25a2dfac7306cb6b9f2df6c00.‍0855 Ether
0xce19ae81f75c20eb3d2ff376db676dec96487b38507b48d831fcd4e3e339408c131080622021-08-27 14:53:30348 days 23 hrs ago 0xa2dbd9e7e2969db08b6a8c6cbc9d002663e701470x9928169569b3f4ce25a2dfac7306cb6b9f2df6c00.‍0855 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
MandelNFT

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-08-24
*/

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol

// 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/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/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/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/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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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


pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant alphabet = "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] = alphabet[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

}

// File: @openzeppelin/contracts/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/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;
    
    uint256 public NFT_PRICE = 30000000000000000; // 0.03 ETH
    string public PROVENANCE_HASH = "";
    uint256 public ROUND = 1; // price doubles each round
    
    bool public saleStarted = true;

    // 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(), '.json'))
            : '';
    }

    /**
     * @dev Base URI for computing {tokenURI}. 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 sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    
    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");   change this to accommodate autosell
       if (_exists(tokenId)) {  //autosell
                uint256 payment = 95 * ROUND * NFT_PRICE / 100;
                address previousOwner = _owners[tokenId];
                address payable wallet = payable(previousOwner);
                sendValue(wallet, payment);    // pay old owner
                _transfer2(_owners[tokenId], to, tokenId);           // transfer to new owner 
        } else
        {       //original minting          
        _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(saleStarted==false, "Main website sale not finished yet");
        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);
    }
    
   function _transfer2(address from, address to, uint256 tokenId) internal virtual {   // for main website buy from previous buyer who autosells at same position
        _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(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` 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 { }
}

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


pragma solidity ^0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

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


pragma solidity ^0.8.0;



/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

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

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

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

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId
            || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

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

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

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

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

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/MandelNFT.sol

pragma solidity ^0.8.0;


contract MandelNFT is ERC721Enumerable, Ownable {
    uint256 public constant MAX_NFT_SUPPLY = 1000;
    uint public constant MAX_PURCHASABLE = 30;
    
    uint256 public mintIndex = 0;


  
    constructor() ERC721("MandelNFT", "MANDELNFT") {
    }

    function contractURI() public view returns (string memory) {
        return "https://mandelnft.onrender.com/collection.json";
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return "https://mandelnft.onrender.com/";
    }

    function getTokenURI(uint256 tokenId) public view returns (string memory) {
        return tokenURI(tokenId);
    }

   function mint(uint256 amountToMint) public payable {
        require(saleStarted == true, "This sale has not started.");
        require(amountToMint > 0, "You must mint at least one.");
        require(amountToMint <= MAX_PURCHASABLE, "You cannot mint more than 30 at a time.");
        require(mintIndex + amountToMint <= MAX_NFT_SUPPLY, "The amount you are trying to mint exceeds the MAX_NFT_SUPPLY.");
        
        require(NFT_PRICE * amountToMint * ROUND == msg.value, "Incorrect Ether value.");

        for (uint256 i = 0; i < amountToMint; i++) {
            mintIndex++;
            _safeMint(msg.sender, mintIndex);
        }
        if (mintIndex == MAX_NFT_SUPPLY) {ROUND++; mintIndex=0;}
   }

    function startSale() public onlyOwner {
        saleStarted = true;
    }

    function pauseSale() public onlyOwner {
        saleStarted = false;
    }

    function setProvenanceHash(string memory _hash) public onlyOwner {
        PROVENANCE_HASH = _hash;
    }

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

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://37cbb6e415336b6be1e66b145692874d37dc701989ddb3a06cade578c8f44143
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.