Contract 0x7aA48E3212f56c388b35281E4f205418d1db3d68 1

Token Contract 
 
 
Txn Hash
Method
Block
From
To
Value
0x7a13fe3601fdaf18a7e4402cf86bc7f36c14b6ec05e98de840ce018696091d8fSet Approval For...164832462023-01-25 10:29:473 days 3 hrs ago0x40b0483aa80d0c4f87d02daf2c7ce7e894a824df IN  United Metaverse Nation: UMN Token0 Ether0.00064558 14
0x09d5fa4a0251225dec707c67c1ae00be938a85c0ee6514280ae451f27a19a571Safe Transfer Fr...164083282023-01-14 23:28:1113 days 14 hrs ago0xfd069a32e8cd1a4c452cd6a889b9774778599874 IN  United Metaverse Nation: UMN Token0 Ether0.00212557 24.52666689
0x0d23715a9f34fc3414fd45b6cf2c236a6341613c048d845ec1a9e67ef755fdc0Set Approval For...163979252023-01-13 12:39:1115 days 1 hr ago0x2146c5e2777034c50a8ede7e4e5b67d132175168 IN  United Metaverse Nation: UMN Token0 Ether0.00035526 14.62896555
0x51fcc8b546d648f6048fb1be8c5ac2152d4ee2f6d8c4d84dced9e83a4237b0a6Set Approval For...163650072023-01-08 22:18:3519 days 15 hrs agoENS Name cryptozaza.eth IN  United Metaverse Nation: UMN Token0 Ether0.0005364 22.0878564
0x60e7cfb62a2810a0fb70d81b6427e69ae8601360bcab275d2a470b68376d0ab7Set Approval For...162776212022-12-27 17:37:4731 days 20 hrs ago0x52ca3ce771d89598ad477186e7d469111f623a5f IN  United Metaverse Nation: UMN Token0 Ether0.00072329 15.68536455
0xcc1abeba87513c30b4272443a87dbafe97ccfc38ae6f9d0d50b0eba523a3b416Safe Transfer Fr...162517222022-12-24 2:50:4735 days 11 hrs ago0xfd069a32e8cd1a4c452cd6a889b9774778599874 IN  United Metaverse Nation: UMN Token0 Ether0.00126121 13.00789925
0xfe5fc165468e9d76e48093c0a925a54ebab9e9e7323f576be848f23522539ce1Safe Transfer Fr...162489752022-12-23 17:40:1135 days 20 hrs ago0xf1fbbc314444ea6d4063b3328a217a8ef87b05fc IN  United Metaverse Nation: UMN Token0 Ether0.00194485 22.46105235
0x672232f1312c74ff611cfd89456a3e3cee7725c24b7b472fd4f24febc1adaa7cSet Approval For...161519112022-12-10 4:27:3549 days 9 hrs agoENS Name evolvecollection.eth IN  United Metaverse Nation: UMN Token0 Ether0.00085202 18.47678969
0xd67033f4b572fb4cd25c0c03dc8c99401d772e04aa5995b13f72cd0a6c8c7fe3Set Approval For...161372422022-12-08 3:15:2351 days 10 hrs ago0x6b070b3e9c23e6d66017d750d03aa1e8c3d0b03f IN  United Metaverse Nation: UMN Token0 Ether0.00068832 14.92691346
0x025c0851d1a464f45b9ff24f351630ac28936f5eff705152f18fb1d8a4ea2140Set Approval For...160652852022-11-28 1:46:2361 days 12 hrs ago0x5116273fa986e5f9b1d534fabe492c87b06843fc IN  United Metaverse Nation: UMN Token0 Ether0.0004733 10.26399676
0x3a40b2fd0b35790c984610dca062eafc152eed1893f175a5a0c81e0b7332d7b7Set Approval For...160564362022-11-26 20:06:2362 days 17 hrs ago0xa41349d96841ddb628b5f1777a2a48c6a62a8a32 IN  United Metaverse Nation: UMN Token0 Ether0.00055939 12.13088194
0xd05df89196df973680f98f8f9afce804b8f6ee809c52ecd27fa31e209dfe98d4Set Approval For...160318382022-11-23 9:35:4766 days 4 hrs ago0xcd3504580293d2ba76f12a0874ba779f2d6eb0cb IN  United Metaverse Nation: UMN Token0 Ether0.00060189 13.02882212
0xfa1005a941ba8fe7de1b4443d7cc6207e06023046c80d2727b8c2ca58e802fd1Set Approval For...160022662022-11-19 6:27:2370 days 7 hrs ago0xea77b1365d466bd900e9c3201cb29fbba9c21020 IN  United Metaverse Nation: UMN Token0 Ether0.00059756 12.95879241
0x305ef85fb607c59bddab5539479d20fb0c632d32d3fb49225b05fcf53ce61c48Set Approval For...159617762022-11-13 14:43:5975 days 23 hrs ago0x2f3d3ec66ff106a928c5fcd68bd9e7c1c72ac0d5 IN  United Metaverse Nation: UMN Token0 Ether0.0005879 12.74916101
0x6f97d28543d3afdf8069426dd75061eb74d3658a9f4e9991e95c2439ddd0491eSet Approval For...158939392022-11-04 3:23:1185 days 10 hrs ago0xcd3504580293d2ba76f12a0874ba779f2d6eb0cb IN  United Metaverse Nation: UMN Token0 Ether0.00066996 14.52885026
0x848e6c027c1e053c69b44592b02eec60791547348e0b7df1294f28479bad4811Set Approval For...158557122022-10-29 19:10:5990 days 18 hrs ago0x42f22f1ffb93f2cf2004d72a38b090589e40cc59 IN  United Metaverse Nation: UMN Token0 Ether0.00064388 13.96315238
0x42485ff998785a06efda83afd168e4706db2822121591e6302818173352c6ed8Safe Transfer Fr...158556882022-10-29 19:06:1190 days 18 hrs ago0x62de352d331528e8ea050d6975037641dbb601cd IN  United Metaverse Nation: UMN Token0 Ether0.00153056 17.120414
0x95af9a1ed00d29366054b295b3ee405a6e68165d9b40f34235402c31fdbdd37eSafe Transfer Fr...158556762022-10-29 19:03:4790 days 18 hrs ago0x62de352d331528e8ea050d6975037641dbb601cd IN  United Metaverse Nation: UMN Token0 Ether0.00166548 18.62959862
0xa7d01c78cfcd601ec3d572f01706723f93747572a5254a5f2a8e43bcad1c017bSet Approval For...158467482022-10-28 13:06:2392 days 48 mins agoENS Name toximelowpsy.eth IN  United Metaverse Nation: UMN Token0 Ether0.00034985 14.40602732
0xdd0a6337966050e86177a3d20a1471b430a5116d3a73b2555edba2f0daa3042cSet Approval For...158461592022-10-28 11:08:1192 days 2 hrs agoENS Name paoap.eth IN  United Metaverse Nation: UMN Token0 Ether0.00026233 10.80244788
0xdca163779900c5d55df21f6a2dbdbbe9e1fcc18c0406318d023366e586c0ec7aSet Approval For...157461482022-10-14 11:48:23106 days 2 hrs agoENS Name javbus.eth IN  United Metaverse Nation: UMN Token0 Ether0.00069294 15.02707648
0x05558dad5db97078465617d11d436951b4316d78f2d07e6a59704e29c063be2dTransfer From157121072022-10-09 17:43:59110 days 20 hrs ago0xf7696191b73095bf807aee277003341a45bf6844 IN  United Metaverse Nation: UMN Token0 Ether0.0022074 26.35643356
0x1d206677838bd85c2ad48cc20568b200c27561e06d53dc7b38154b5ec1c3b36aSet Approval For...157108892022-10-09 13:39:11111 days 15 mins ago0x2a5620208693ad312de212d359dd2fe364744e6b IN  United Metaverse Nation: UMN Token0 Ether0.00128881 27.94915949
0xfd7363aa0bec2e1a3269b7d2e844e8cd3821bf0a2c3aa26ca07843ebc7d2dcb0Set Approval For...157033022022-10-08 12:14:11112 days 1 hr agoENS Name gldn405.eth IN  United Metaverse Nation: UMN Token0 Ether0.00037924 8.22435031
0x43d45c3a5f27b6c9c289f7ca714fd7d5f8d481f33611ae7c2a128aff86663e0fSet Approval For...156889882022-10-06 12:13:35114 days 1 hr agoSybil Delegate: Winbcblog1 IN  United Metaverse Nation: UMN Token0 Ether0.00058652 12.71938507
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OVERVIEW

The United Metaverse Nation is the first decentralized autonomous organization (DAO) that acts as a virtual country. The UMN is a member-owned nation without centralized leadership.All activities, such as government laws and monetary policies, are transparent and fully publi...

Latest 4 internal transactions
Parent Txn Hash Block From To Value
0x1140b20cfcb4f9e15149dbeb90938acdbeb0e56a2dc1ad1031cf83e049287217134163602021-10-14 12:36:00471 days 1 hr ago United Metaverse Nation: UMN TokenUnited Metaverse Nation: Deployer5.1 Ether
0x6a0239826886aabbe247faeb7d1cf65749d5cd71d41fe4719f9eedb649875ece133790392021-10-08 15:34:45476 days 22 hrs ago United Metaverse Nation: UMN Token0xded0b999b5b875fde1a57bba00adcb8c9682c32481.8 Ether
0xa69b37a006b2e51a6c24b5404fbac174b9723ddb827b92fd3ee99b3b18e8d1f4132748512021-09-22 9:44:19493 days 4 hrs ago United Metaverse Nation: UMN Token0x99e33308d04a1f5c8c2ebcbd71b4285bfc11691c217.9 Ether
0xc2b7beacdf5df93b564f06c4c72b8ea585c7d4bff96c50a722565fe273881f33132519002021-09-18 20:41:51496 days 17 hrs ago United Metaverse Nation: UMN TokenUnited Metaverse Nation: Deployer0.2 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
UnitedMetaverseNation

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-09-18
*/

/********************************************************************************
    * United Metaverse Nation

                                                      ..:---=====---:..                                  
                
                                               .-=*#%@@@@@@@@@@@@@@@@@@@%#*=-.                           
                
                                           :=#@@@@@@@@@@@@@@@@@@@@@@#*%@@@@@@@@*=:                       
                
                                        -*%@@@@@@@@%##@@@@@@@@@@@@@=:.*@@@@@@@@@@@%*-                    
                
                                     :[email protected]@@@%*#@@@@%[email protected]@@@@+*+=-=-:.   :#@@@@@@@@@@@@@%*:                 
                
                                   -#@@@@%#=-=##+**@@@@@@%#-           :*@@@@@@@@@@@@@@@#=               
                
                                 -%@@@@@*@@@*. -%@@@#*+=:      -****:[email protected]@@@@@@@@@@@@@@@@@@%=              
                
                               .#@@@@@@@@@@@=. =::-          .#@%#@@*%@@@@@@@@@@@@@@@@@@@@@@#-           
                
                              [email protected]@@@@@@@@@**#.               [email protected]@@=-+%@@@@@@@@@@@@@@@@@@@@@@@@@%*          
                
                    .-----===*@@@@@@**=%#-#                 .:=#. *@@@@@@@@@@@@@@@@@@@@@@@@@@@%#.        
                
                      [email protected]@@@@#=:                        [email protected]%**@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%#.          
                
                       [email protected]@@%#:                       :=*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@###**+          
                
                      :@@@%%.                        [email protected]@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@:::::..         
                
                      %@@@%*                      [email protected]%%@@%+=+*[email protected]@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%=        
                
                     [email protected]@@@*-                      @@@@%%-   .%[email protected]=:@@@%@@@@@@@@@@@@@@@@@@@##@@@%%.       
                
                    [email protected]@@@%+-                      :**#%%*##*#+ .       [email protected]@@@@@@@@@@@@@@@@@* #@@@%+       
                
                    [email protected]@@@% #.                   :#@@@@@@@@@@@*. -+===++%@@@@@@*#@#*++:-.*@# :@@@%%       
                
                    *@@@%%..                  :[email protected]@@@@@@@@@@@@@@@@@@@@@@%*@@@@@@@%@@@%%:  #@  @@@%%:      
                
                    %@@@@%*                 .*@@@@@@@@@@@@@@@@@@@@@@@@@@*[email protected]@@@@@@@@%%:   %- #@@@%-      
                
                    =+==++#****++=          :::---=+++++++++++*@@@@@@@@@@%*@@@@@@**@@@***++= -=+=+-:**++=
                
                          [email protected]@@@@@%+               #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@[email protected]@%@#+.        [email protected]@@%#
                
                          [email protected]@@@@@@%+             [email protected]@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*#+#=*-        [email protected]@@%*
                
                          [email protected]@@@@@@%%.            [email protected]@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%%.        #@@%%-
                
                 =+++++++++%@@@@@@@%#:             [email protected]@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%=        :@@@%% 
                
                 [email protected]@@@@@@@@@*-            .+#%%%%*+*@@@@@@@@@@@@@@@@@@@@@@@@@%=         #@@@%= 
                
                            [email protected]@@@@@@@@@%%-                     .:*@@@@@@@@@@@@@@@@@@@%*.         [email protected]@@%#  
                
                             #@@@@@@@@@@%%:                      %@@@@@@@@@@@@@@@@@@%*          :@@@%%:  
                
                             .%@@@@@@@@@%%.                      [email protected]@@@@@@@@@@@@@@@%%:         :@@@%%-   
                
                            ..:%@@@@@@%%#=                         :======#@@@@@@@@%%:     [email protected]@%##-    
                
                            [email protected]@@@@@@%#                             [email protected]@@@@@@@@@@@@@@%#    [email protected]@@@%=         
                
                             :%@@@@%=                             [email protected]@@@@@@@@@@@@@@#:   .*@@@%%:          
                
                               [email protected]@@@%+                            .%@@@@@@@@@@@@%+    .+***+=            
                
                                .*@@@@%+.                           #@@@@@@@@@@#-   ::::::               
                
                                  .*@@@@@*-                         .%@@@@@@%*-  -*@@@@%+.               
                
                                    .=%@@@@%+:                       .-:-::.  -*@@@@@#=                  
                
                                       :+%@@@@@#=:                       .-+#@@@@@#=.                    
                
                                          .=*%@@@@@%*+-:..       ..:-=*#@@@@@@%+-.                       
                
                                              .:=*#%@@@@@@@@@@@@@@@@@@@@%#+=:                             
                
                                                     ..:--========--:.  
    ******************************************************************************/

// Sources flattened with hardhat v2.6.1 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]



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 whiteed 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 whiteed 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]



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/[email protected]



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/[email protected]



pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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



pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}


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



pragma solidity ^0.8.0;

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

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

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

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

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


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



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/[email protected]



pragma solidity ^0.8.0;







/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

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

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

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

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        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 whiteed 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]



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/[email protected]



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 whites 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/utils/math/[email protected]



pragma solidity ^0.8.0;

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

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is 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 @openzeppelin/contracts/access/[email protected]



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() {
        _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);
    }
}

pragma solidity 0.8.4;

contract UnitedMetaverseNation is ERC721("United Metaverse Nation", "UMN"), ERC721Enumerable, Ownable {
    using SafeMath for uint256;
    using Strings for uint256;
    /*
     * Currently Assuming there will be one baseURI.
     * If it fails to upload all NFTs data under one baseURI,
     * we will divide baseURI and tokenURI function will be changed accordingly.
    */
    string private baseURI;
    string private blindURI;
    uint256 public constant BUY_LIMIT_PER_TX = 10;
    uint256 public constant MAX_NFT_PUBLIC = 10931;
    uint256 private constant MAX_NFT = 11111;
    uint256 public NFTPrice = 100000000000000000;  // 0.1 ETH
    bool public reveal;
    bool public isActive;
    bool public isPresaleActive;
    uint256 public constant WHITELIST_MAX_MINT = 2;
    mapping(address => bool) private whiteList;
    mapping(address => uint256) private whiteListClaimed;
    
    /*
     * Function to reveal all NFTs
    */
    function revealNow() 
        external 
        onlyOwner 
    {
        reveal = true;
    }
    
    /*
     * Function addToWhiteList to add whitelisted addresses to presale
    */
    function addToWhiteList(
        address[] memory _addresses
    ) 
        external
        onlyOwner
    {
        for (uint256 i = 0; i < _addresses.length; i++) {
            require(_addresses[i] != address(0), "Cannot add the null address");
            whiteList[_addresses[i]] = true;
            /**
            * @dev We don't want to reset _whiteListClaimed count
            * if we try to add someone more than once.
            */
            whiteListClaimed[_addresses[i]] > 0 ? whiteListClaimed[_addresses[i]] : 0;
        }
    }
    
    /*
     * Function onWhiteList returns if address is whitelisted or not 
    */
    function onWhiteList(
        address _addr
    ) 
        external 
        view
        returns (bool) 
    {
        return whiteList[_addr];
    }
    
    /*
     * Function setIsActive to activate/desactivate the smart contract
    */
    function setIsActive(
        bool _isActive
    ) 
        external 
        onlyOwner 
    {
        isActive = _isActive;
    }
    
    /*
     * Function setPresaleActive to activate/desactivate the presale  
    */
    function setPresaleActive(
        bool _isActive
    ) 
        external 
        onlyOwner 
    {
        isPresaleActive = _isActive;
    }
    
    /*
     * Function to set Base and Blind URI 
    */
    function setURIs(
        string memory _blindURI, 
        string memory _URI
    ) 
        external 
        onlyOwner 
    {
        blindURI = _blindURI;
        baseURI = _URI;
    }
    
    /*
     * Function to withdraw collected amount during minting by the owner
    */
    function withdraw(
        address _to
    ) 
        public 
        onlyOwner 
    {
        uint balance = address(this).balance;
        require(balance > 0, "Balance should be more then zero");
        payable(_to).transfer(balance);
    }
    
    /*
     * Function to mint new NFTs during the public sale
     * It is payable. Amount is calculated as per (NFTPrice.mul(_numOfTokens))
    */
    function mintNFT(
        uint256 _numOfTokens
    ) 
        public 
        payable 
    {
    
        require(isActive, 'Contract is not active');
        require(!isPresaleActive, 'Only whiteing from White List');
        require(_numOfTokens <= BUY_LIMIT_PER_TX, "Cannot mint above limit");
        require(totalSupply().add(_numOfTokens) <= MAX_NFT_PUBLIC, "Purchase would exceed max public supply of NFTs");
        require(NFTPrice.mul(_numOfTokens) == msg.value, "Ether value sent is not correct");
        
        for(uint i = 0; i < _numOfTokens; i++) {
            _safeMint(msg.sender, totalSupply());
        }
    }
    
    /*
     * Function to mint new NFTs during the presale
     * It is payable. Amount is calculated as per (NFTPrice.mul(_numOfTokens))
    */ 
    function mintNFTDuringPresale(
        uint256 _numOfTokens
    ) 
        public 
        payable
    {
        require(isActive, 'Contract is not active');
        require(isPresaleActive, 'Only whiteing from White List');
        require(whiteList[msg.sender], 'You are not on the White List');
        require(totalSupply() < MAX_NFT_PUBLIC, 'All public tokens have been minted');
        require(_numOfTokens <= WHITELIST_MAX_MINT, 'Cannot purchase this many tokens');
        require(totalSupply().add(_numOfTokens) <= MAX_NFT_PUBLIC, 'Purchase would exceed max public supply of NFTs');
        require(whiteListClaimed[msg.sender].add(_numOfTokens) <= WHITELIST_MAX_MINT, 'Purchase exceeds max whiteed');
        require(NFTPrice.mul(_numOfTokens) == msg.value, "Ether value sent is not correct");
        for (uint256 i = 0; i < _numOfTokens; i++) {
            
            whiteListClaimed[msg.sender] += 1;
            _safeMint(msg.sender, totalSupply());
        }
    }
    
    /*
     * Function to mint all NFTs for giveaway and partnerships
    */
    function mintByOwner(
        address _to, 
        uint256 _tokenId
    ) 
        public 
        onlyOwner
    {
        require(_tokenId > MAX_NFT_PUBLIC, "Tokens number to mint must exceed number of public tokens");
        require(_tokenId <= MAX_NFT, "Tokens number to mint cannot exceed number of MAX tokens");
        _safeMint(_to, _tokenId);
    }
    
    /*
     * Function to get token URI of given token ID
     * URI will be blank untill totalSupply reaches MAX_NFT_PUBLIC
    */
    function tokenURI(
        uint256 _tokenId
    ) 
        public 
        view 
        virtual 
        override 
        returns (string memory) 
    {
        require(_exists(_tokenId), "ERC721Metadata: URI query for nonexistent token");
        if (!reveal) {
            return string(abi.encodePacked(blindURI));
        } else {
            return string(abi.encodePacked(baseURI, _tokenId.toString()));
        }
    }
    
    function supportsInterface(
        bytes4 _interfaceId
    ) 
        public
        view 
        override (ERC721, ERC721Enumerable) 
        returns (bool) 
    {
        return super.supportsInterface(_interfaceId);
    }

    // Standard functions to be overridden 
    function _beforeTokenTransfer(
        address _from, 
        address _to, 
        uint256 _tokenId
    ) 
        internal 
        override(ERC721, ERC721Enumerable) 
    {
        super._beforeTokenTransfer(_from, _to, _tokenId);
    }
}

Contract Security Audit

Contract ABI

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:"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_isActive","type":"bool"}],"name":"setIsActive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_isActive","type":"bool"}],"name":"setPresaleActive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_blindURI","type":"string"},{"internalType":"string","name":"_URI","type":"string"}],"name":"setURIs","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://3c03e57dcd9282e9581b026f3ef717c0d68c66d8ca9137f14dc154c5d5a68f60
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.