Contract 0x4372f4D950d30C6f12C7228AdE77d6cc019404c9 3

 
 
Txn Hash
Method
Block
From
To
Value
0x9c1622336f932ebd78f626f2514fe34ed7c28aef81fdba562f3bf619bc0f089fSet Approval For...152953772022-08-07 13:18:205 hrs 2 mins ago0x3c800d1658376a0bdf50cb7e862d59b346e98c82 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00054122 11.60545992
0x1ee66a6304ab2608e83706f93c265dc528937a94722d2a640d7fb65fbf508460Transfer From152953712022-08-07 13:17:275 hrs 3 mins ago0x746efd25ebd0b65f371b9d438cd34161597c5529 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00120429 14.16252121
0x7a595b15f85d45db833ccda17859d75de64560df2b26bb9803708be4395a5a80Set Approval For...152953552022-08-07 13:14:315 hrs 6 mins ago0x746efd25ebd0b65f371b9d438cd34161597c5529 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00107194 22.98574608
0x8388c947919da5db9815521f0500ea7fdd0e7c75f376608472c94bc511e8764aSet Approval For...152935292022-08-07 6:27:3211 hrs 53 mins ago0x33d5cc43debe407d20dd360f4853385135f97e9d IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00032859 7.04612847
0xa10f22a8e5647292fbd158a2a542e8d39f329b9a0b60b8f2ae9fdcd20b38362bSet Approval For...152623542022-08-02 9:44:465 days 8 hrs agoENS Name yvmeng.eth IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00051489 11.04090586
0x0415241350bfca2c282981d58897b8439d47df80c516a69b3c44021fabd661e1Set Approval For...152302512022-07-28 9:41:1210 days 8 hrs ago0x46ad61c69c20b4f5852e8e6eaf6e20e819bd17d2 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00049637 10.62464755
0x11b197cc9a09f1f3206df5a7fbbe982ba146109008fd748c5c3197c35e0cbbf9Transfer From152302382022-07-28 9:38:4010 days 8 hrs ago0xc79573bceaf630dbed8d5ee44be44122df52728f IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00110005 12.93848596
0x336457dc84324bf9f724216c95ea387f41515149a3d7381de52548bdb1068975Set Approval For...152060772022-07-24 15:21:5514 days 2 hrs ago0xb2b6ea16c60ab557c0ea9b0c7e42096de5ff747c IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00057589 12.3489689
0x3a338f45f62db74de951d12274ed3181c95e7d2cccb681024300538166ddd6efSet Approval For...152040392022-07-24 7:42:0514 days 10 hrs ago0x344cce867fe91604a626305db08b4e42ab156543 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00048127 10.31996532
0x679869f10961aca1161210184ffc7b5bc0531c8137be07a308491f4ef92d23faTransfer From151985702022-07-23 11:11:3215 days 7 hrs ago0x1c2daf532804c0cd1ec272fe41446790064a86ce IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00049696 5.84515748
0x15e3f4b3ac47955461588f66994f768603a6189e0b585c214aa6c0aa833c726fSet Approval For...151926392022-07-22 13:30:3116 days 4 hrs ago0x954f24c476cadc4c364b3e871f2964c380229399 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00074192 15.90909288
0x7ae01c197332e01c064fb925b2872e72b95f6c8dd0d14e3d6360eaafc5a19d21Safe Transfer Fr...151912292022-07-22 8:21:1416 days 9 hrs ago0x6a586a8f35896d7a12f1a1e30dedb46c6decd51e IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00101601 11.55441514
0xbe2f3e83a5ef24973a26e3e0d95d34d99e9a48cbde0e573bbd21d955c054c97fSet Approval For...151901272022-07-22 3:57:3316 days 14 hrs ago0x336bd67b21d8e97c8ac69c8b6e8a45fa9b0152d9 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00064777 13.89034569
0x712c04ca22e563e72d1924f3d5a90a669cb5a2b6be6df79925b45fbd61123ee9Set Approval For...151901202022-07-22 3:55:2716 days 14 hrs ago0x336bd67b21d8e97c8ac69c8b6e8a45fa9b0152d9 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00047193 10.101656
0xa2d4db7be402a583fdacfe7a56ca5851be8148195b2611ec2ecfc7cc2fe0ab66Set Approval For...151873832022-07-21 17:53:4817 days 26 mins ago0xf914419fde38abc1b4831df21f5f66ad8e537806 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00093735 20.09987483
0xbbedf99976d10e6997fa6c68802eb16495369eb1d379715c069071ae87c0063eSet Approval For...151801782022-07-20 15:03:3418 days 3 hrs ago0xaa398d78cebb17a3780695a52310b214f6095253 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00982984 210.78257672
0xf8db25088ee0c7d810f55e55311d72ba2d5d0e3ea173770274029844edf456dbSet Approval For...151464702022-07-15 9:32:2523 days 8 hrs ago0x9cc47888e06766d2070163c8364cb7155cc14918 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00060423 12.95665965
0xa2855f452aad1b19c5de9381d15d4929fc4f26249e7266734c6ea589f6485fecSet Approval For...151447982022-07-15 3:16:0723 days 15 hrs agoENS Name bitfuture.eth IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00082981 17.76184017
0x6534c607313a0d21b8ca7c6ed21d04a89f458411a0ed7a06f8dc1bd43531b5f7Set Approval For...151416712022-07-14 15:45:3024 days 2 hrs ago0xcf7fe7a9f18f3a1f3c5141112e798452bb4e43ce IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00135736 29.10615209
0xaf2be3cc8d62377f548e071177124b227f28fb9fe49adc2ce4d3afe3e88f2e3dSet Approval For...151389262022-07-14 5:54:3124 days 12 hrs ago0x6451ab2710b0448d373332bc9fb9b717c55ec844 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00072746 15.59916326
0xcfec8ac22e9338fcac3ee082b2432992ed037439392fb2c6f4b39f58f67ee210Transfer From151212642022-07-11 12:06:4027 days 6 hrs agoENS Name scriptmoney.eth IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00196581 23.12448063
0x6f998f91d7a89f284116de218d19083b035a1de31c43aabced399d62c7d8a9c6Set Approval For...151159692022-07-10 16:31:5628 days 1 hr ago0xdb8482dede003d114deb78e34c6b585f80bfb165 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.0017084 36.56762079
0x4c3a5fdd0b370119ea22b2b0dbbc02765c7974e23036c196cd0b1e6b8525ed3eSet Approval For...151133902022-07-10 6:53:1428 days 11 hrs ago0x3a67a4dea428c6957a7516fe369c8bb98a35aeba IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00032772 7.02751357
0x8dc04728c07a51c3c9e56c094fafafcdbefba0276c88ea3158bdc252ae1f49acSet Approval For...151128562022-07-10 4:56:1728 days 13 hrs ago0xcacb47d9495299dc538ce2b20603fcabad7df42a IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00036985 7.93082564
0x75761f3d3300da6b9a5ff7894118b6b88e34b705da395be6cc40b7ebcfd12df0Set Approval For...150843122022-07-05 19:03:0532 days 23 hrs ago0xdb8482dede003d114deb78e34c6b585f80bfb165 IN  0x4372f4d950d30c6f12c7228ade77d6cc019404c90 Ether0.00145948 31.29586865
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0x53b4e25c484fccef9a0dedd1ac2a7257e921b7924c02a48e9a10f775d33704ef140425002022-01-20 12:47:10199 days 5 hrs ago 0x4372f4d950d30c6f12c7228ade77d6cc019404c90x776a074a18a8035a812189749dbd11153ac420251,298.5 Ether
0x9259b1f3a95bb964353bb314f521435474dcc03ea2c25914d1001d3a5569e32c139243122022-01-02 6:04:20217 days 12 hrs ago 0x4372f4d950d30c6f12c7228ade77d6cc019404c90x0d8c536312f38fcd6ec391355ef9b235356d0e96192.5 Ether
0xfa95a1f886ddaa743335d6a356dcc2430d8ca5f1859a2cf605eccecd11280b14139243042022-01-02 6:02:40217 days 12 hrs ago 0x4372f4d950d30c6f12c7228ade77d6cc019404c90x0d8c536312f38fcd6ec391355ef9b235356d0e96357.5 Ether
0xbe601ad0dbde978c7b7a129dec4019fed601eef2fb94d7dafa702ca45e155d66138338682021-12-19 6:14:28231 days 12 hrs ago 0x4372f4d950d30c6f12c7228ade77d6cc019404c90x0d8c536312f38fcd6ec391355ef9b235356d0e9684.6 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
AlphaShark

Compiler Version
v0.8.0+commit.c7dfd78e

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 13 : nftshark.sol
// Contract based on https://docs.openzeppelin.com/contracts/3.x/erc721
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/token/ERC721/ERC721.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol';

contract AlphaShark is ERC721, ERC721Enumerable, Ownable {
  using Strings for uint256;
  bool public _isSaleActive = false;
  bool public _isAuctionActive = false;
  bool public isWhiteListActive = false;
  // Constants
  uint256 constant public MAX_SUPPLY = 888;
  uint256 public mintPrice = 0.45 ether;
  uint256 public tierSupply = 208;
  uint256 public tierWhitelist = 30;
  uint256 public maxBalance = 2;
  uint256 public maxMint = 2;
  // Auction variables
  uint256 public auctionStartTime;
  uint256 public auctionTimeStep;
  uint256 public auctionStartPrice;
  uint256 public auctionEndPrice;
  uint256 public auctionPriceStep;
  uint256 public auctionStepNumber;
  // Mapping for Whitelist
  mapping(address => uint256) private _allowList;
  // NFT URI
  string private _baseURIExtended;

  event TokenMinted(uint256 supply);
  event SaleStarted();
  event SalePaused();
  event AuctionStarted();
  event AuctionPaused();
  // init
  constructor() ERC721('Alpha Shark', 'AS') {}
  // Status of the Contract
  function startSale() external onlyOwner {
    require(! _isSaleActive, 'Sale is already began');
    _isSaleActive = true;
    emit SaleStarted();
  }
  function pauseSale() external onlyOwner {
    require(_isSaleActive, 'Sale is already paused');
    _isSaleActive = false;
    emit SalePaused();
  }
  function startAuction() external onlyOwner {
    require(!_isAuctionActive, 'Auction is already began');
    _isAuctionActive = true;
    emit AuctionStarted();
  }
  function pauseAuction() external onlyOwner {
    require(_isAuctionActive, 'Auction is already paused');
    _isAuctionActive = false;
    emit AuctionPaused();
  }
  function setIsWhiteListActive(bool _isAllowListActive) external onlyOwner {
    isWhiteListActive = _isAllowListActive;
  }

  // Variables for diff round
  function setMintPrice(uint256 _mintPrice) external onlyOwner {
    mintPrice = _mintPrice;
  }
  function setTierSupply(uint256 _tierSupply) external onlyOwner {
    tierSupply = _tierSupply;
  }
  function setWhitelistSupply(uint256 _whitelistSupply) external onlyOwner {
    tierWhitelist = _whitelistSupply;
  }
  function setMaxBalance(uint256 _maxBalance) external onlyOwner {
    maxBalance = _maxBalance;
  }
  function setMaxMint(uint256 _maxMint) external onlyOwner {
    maxMint = _maxMint;
  }
  function setWhiteList(address[] calldata addresses, uint256 numAllowedToMint) external onlyOwner {
    for (uint256 i = 0; i < addresses.length; i++) {
      _allowList[addresses[i]] = numAllowedToMint;
    }
  }
  function setAuction(uint256 _auctionStartTime, uint256 _auctionTimeStep, uint256 _auctionStartPrice, uint256 _auctionEndPrice, uint256 _auctionPriceStep, uint256 _auctionStepNumber) public onlyOwner {
    auctionStartTime = _auctionStartTime;
    auctionTimeStep = _auctionTimeStep;
    auctionStartPrice = _auctionStartPrice;
    auctionEndPrice = _auctionEndPrice;
    auctionPriceStep = _auctionPriceStep;
    auctionStepNumber = _auctionStepNumber;
  }

  function withdraw(address to) public onlyOwner {
    uint256 balance = address(this).balance;
    payable(to).transfer(balance);
  }

  function preserveMint(uint numWinnerSharks, address to) public onlyOwner {
    require(totalSupply() + numWinnerSharks <= tierSupply, 'Preserve mint would exceed tier supply');
    require(totalSupply() + numWinnerSharks <= MAX_SUPPLY, 'Preserve mint would exceed max supply');
    _mintWinnerShark(numWinnerSharks, to);
    emit TokenMinted(totalSupply());
  }

  function getTotalSupply() public view returns (uint256) {
    return totalSupply();
  }

  function getWinnerSharkByOwner(address _owner) public view returns (uint256[] memory) {
    uint256 tokenCount = balanceOf(_owner);
    uint256[] memory tokenIds = new uint256[](tokenCount);
    for (uint256 i; i < tokenCount; i++) {
      tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
    }
    return tokenIds;
  }

  function getAuctionPrice() public view returns (uint256) {
    if (block.timestamp == auctionStartTime) {
      return auctionStartPrice;
    }
    if ((auctionStartTime + auctionTimeStep * auctionStepNumber) < block.timestamp) {
      return auctionEndPrice;
    }
    uint256 step = (block.timestamp - auctionStartTime) / auctionTimeStep; 
    uint256 auctionPrice = auctionStartPrice - step * auctionPriceStep;
    return auctionPrice;
  }

  function mintWinnerShark(uint256 numWinnerSharks) external payable {
    uint256 ts = totalSupply();
    require(_isSaleActive, 'Sale must be active to mint WinnerSharks');
    require(ts + numWinnerSharks <= tierSupply, 'Sale would exceed tier supply');
    require(ts + numWinnerSharks <= MAX_SUPPLY, 'Sale would exceed max supply');
    require(balanceOf(msg.sender) + numWinnerSharks <= maxBalance, 'Sale would exceed max balance');
    require(numWinnerSharks <= maxMint, 'Sale would exceed max mint');
    require(numWinnerSharks * mintPrice <= msg.value, 'Not enough ether sent');
    _mintWinnerShark(numWinnerSharks, msg.sender);
    emit TokenMinted(totalSupply());
  }

  function mintWhiteList(uint256 numWinnerSharks) external payable {
    uint256 ts = totalSupply();
    require(isWhiteListActive, "White list is not active to mint WinnerSharks");
    require(numWinnerSharks <= _allowList[msg.sender], "Exceeded max available to purchase");
    require(ts + numWinnerSharks <= (tierWhitelist+tierSupply), 'Sale would exceed Whitelist supply');
    require(ts + numWinnerSharks <= MAX_SUPPLY, 'Sale would exceed max supply');
    require(balanceOf(msg.sender) + numWinnerSharks <= maxBalance, 'Sale would exceed max balance');
    require(numWinnerSharks <= maxMint, 'Sale would exceed max mint');
    _allowList[msg.sender] -= numWinnerSharks;
    _mintWinnerShark(numWinnerSharks, msg.sender);
    emit TokenMinted(totalSupply());
  }

  function auctionMintWinnerShark(uint256 numWinnerSharks) external payable {
    uint256 ts = totalSupply();
    require(_isAuctionActive, 'Auction must be active to mint WinnerSharks');
    require(block.timestamp >= auctionStartTime, 'Auction not start');
    require(ts + numWinnerSharks <= tierSupply, 'Auction would exceed tier supply');
    require(ts + numWinnerSharks <= MAX_SUPPLY, 'Auction would exceed max supply');
    require(balanceOf(msg.sender) + numWinnerSharks <= maxBalance, 'Auction would exceed max balance');
    require(numWinnerSharks <= maxMint, 'Auction would exceed max mint');
    require(numWinnerSharks * getAuctionPrice() <= msg.value, 'Not enough ether sent');
    _mintWinnerShark(numWinnerSharks, msg.sender);
    emit TokenMinted(totalSupply());
  }

  function _mintWinnerShark(uint256 numWinnerSharks, address recipient) internal {
    uint256 supply = totalSupply();
    for (uint256 i = 0; i < numWinnerSharks; i++) {
      _safeMint(recipient, supply + i);
    }
  }

  function setBaseURI(string memory baseURI_) external onlyOwner {
    _baseURIExtended = baseURI_;
  }

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

  function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
    require(_exists(tokenId), 'ERC721Metadata: URI query for nonexistent token');
    return string(abi.encodePacked(_baseURI(), tokenId.toString()));
  }

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

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

File 2 of 13 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

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

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

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

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

File 3 of 13 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

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

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 4 of 13 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @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 5 of 13 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

File 6 of 13 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @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 7 of 13 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

File 8 of 13 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @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 9 of 13 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 10 of 13 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

File 11 of 13 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @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 12 of 13 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 13 of 13 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @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);
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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eMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"numWinnerSharks","type":"uint256"}],"name":"mintWhiteList","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"numWinnerSharks","type":"uint256"}],"name":"mintWinnerShark","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pauseAuction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"pauseSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"numWinnerSharks","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"preserveMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_auctionStartTime","type":"uint256"},{"internalType":"uint256","name":"_auctionTimeStep","type":"uint256"},{"internalType":"uint256","name":"_auctionStartPrice","type":"uint256"},{"internalType":"uint256","name":"_auctionEndPrice","type":"uint256"},{"internalType":"uint256","name":"_auctionPriceStep","type":"uint256"},{"internalType":"uint256","name":"_auctionStepNumber","type":"uint256"}],"name":"setAuction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"baseURI_","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_isAllowListActive","type":"bool"}],"name":"setIsWhiteListActive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxBalance","type":"uint256"}],"name":"setMaxBalance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxMint","type":"uint256"}],"name":"setMaxMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_mintPrice","type":"uint256"}],"name":"setMintPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tierSupply","type":"uint256"}],"name":"setTierSupply","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"addresses","type":"address[]"},{"internalType":"uint256","name":"numAllowedToMint","type":"uint256"}],"name":"setWhiteList","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_whitelistSupply","type":"uint256"}],"name":"setWhitelistSupply","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startAuction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startSale","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":[],"name":"tierSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tierWhitelist","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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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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.