Contract 0x1E4CC5f267853Aa2E2142eA7F0532A776117Cfff

 

Contract Overview

Balance:
53.13070221525526254 Ether

EtherValue:
$70,357.27 (@ $1,324.23/ETH)

Token:
Txn Hash
Method
Block
From
To
Value
0xb9a601f287c161ae2003f143cc38e70dd4f0a64192b9923181e615e0c4beeed6Bid156492372022-09-30 22:48:3532 mins ago0x39e4c6785a9f4ca46afadc1813e3fd28b9d93dc1 IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01 Ether0.00042552 11.29377149
0x7a26a7a9b273f826172a888b9423354d144068e4618ea20cd4383885502df4b3Bid156486212022-09-30 20:44:352 hrs 36 mins agoENS Name jami.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01696969 Ether0.00151705 20.40430223
0x068c8c2857b98b84a15a54589b93238cc954c59231fb8e33c5a849081dcb832dBid156485622022-09-30 20:32:472 hrs 48 mins ago0x39e4c6785a9f4ca46afadc1813e3fd28b9d93dc1 IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.015 Ether0.00160123 21.53646731
0x1513974d055c3889198520d8e11871734ac7f304a3dd30576142075d4e798154Bid156467872022-09-30 14:35:478 hrs 45 mins agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.02018371 Ether0.00073489 19.50467328
0x2aa4e77e0fac1cb03f2f3eb8055d246749b24610ca5b9cccc2e671cf7f4749f3Bid156467832022-09-30 14:34:598 hrs 46 mins agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01028746 Ether0.00075906 20.14603685
0x46ba83660e84fbdf8e3b159acea042bcf8103fe196b7b97fab95a4e4b65e498dBid156424652022-09-30 0:06:3523 hrs 14 mins agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.0123713 Ether0.00098021 13.18383612
0x08e2fb90c64dda586aab0d5dd5205e821ffd8942c7392818db15f3c19ef96b91Settle156424362022-09-30 0:00:4723 hrs 20 mins ago0x10d9cb170172eca59ab5c309ee1afa495bdb7116 IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.0009053213
0xfdcc992c602a73c373608a4e6c6f0c634b9bc1a7e32130cccc9e7fa1d07b7dfcBid156356842022-09-29 1:21:231 day 21 hrs agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.0118262 Ether0.00096934 13.03761546
0x786e3b54091f439e097491c6978ff4ca8ef16e3d8e38ec67c02cb073ebc6dad4Settle156352802022-09-29 0:00:231 day 23 hrs ago0x10d9cb170172eca59ab5c309ee1afa495bdb7116 IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.0008356812
0xc7256c5fbd577af6b996317c027f719ffc564caa08779daadc1d93b53d2d154dBid156340252022-09-28 19:47:592 days 3 hrs agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01 Ether0.00133804 17.99662129
0xeaaf62175616086118549041c77064a1c25918079d57f812b4805358bcd48f76Signed Refund156295802022-09-28 4:54:592 days 18 hrs agoENS Name moredillon.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.00056235 11.03050276
0xef87df3935f900229b9dda5bad7d324eff68338ee8bf336d155402d8931568e2Signed Refund156281262022-09-28 0:01:592 days 23 hrs agoENS Name juanderer.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.000715 14.02466033
0xf89923ba040aa5cfccdf2e3a67e3d0e7cd9bb2479c8094cca45096a014f141d2Bid156281192022-09-28 0:00:352 days 23 hrs agoENS Name juanderer.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01212121 Ether0.00073374 9.8687604
0xe13fa9bb66203c6946f1cc1046bf020fcffc70f674d16fc6d7140c61b0d9af55Settle156281192022-09-28 0:00:352 days 23 hrs ago0x10d9cb170172eca59ab5c309ee1afa495bdb7116 IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.0007660411
0x2f52525a7191524040c7fea9de28192db180c29e335d68c3091abf5da60e2ffeBid156279642022-09-27 23:29:232 days 23 hrs agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01173743 Ether0.00091018 12.2419388
0x2d56e7e2da9567fc39b27cfdae6d847c4ea140f252b4bb7532d9c72dfb7f6bcbBid156279632022-09-27 23:29:112 days 23 hrs agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01163929 Ether0.00097601 13.12732111
0x79ec16ac75b3d023452aff8b1297c2ae24a7595912c9526aa3ea5df2520c2b44Bid156279612022-09-27 23:28:472 days 23 hrs agoENS Name pugson.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.01012834 Ether0.00088488 11.90156465
0x39f793362b36ddda2d6f3941f7fd4e6fd4b61145f53f8a175fa905463a713ac2Signed Refund156209872022-09-27 0:02:233 days 23 hrs agoENS Name juanderer.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.00050838 9.97421802
0x02e0ffaa1c2632198b7c1fe406b8184d698613f9f4e48af1cb6a2b7f49592787Settle156209772022-09-27 0:00:233 days 23 hrs ago0x10d9cb170172eca59ab5c309ee1afa495bdb7116 IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.0010408812
0x581336a59129dbb28a112b3f2ec10a5a8fea8bb980bb67491220eca8a18ab05cBid156209742022-09-26 23:59:473 days 23 hrs agoENS Name juanderer.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.0201 Ether0.00065359 8.7907889
0x9459d6fb3e2c805336b8d84ede593a3b80ce66c26dcf0650784dc0daa8bbd10bBid156156582022-09-26 6:08:234 days 17 hrs agoENS Name moredillon.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.0112 Ether0.00049911 6.71308625
0xb0bbfaa39385bcaed273d8969aecf7dd7066b626579b926d04a6b1b82398b8f0Settle156138292022-09-26 0:00:234 days 23 hrs ago0x10d9cb170172eca59ab5c309ee1afa495bdb7116 IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.0007660411
0x57d3852c50961f7077e4d0a205be190131f94254cf75fc6a6db5b0a8e4935102Bid156131772022-09-25 21:49:115 days 1 hr agoENS Name tmincey.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.018 Ether0.00102794 13.82572078
0x57c3174f2812041e169c9724114457a0fe8cfcec3dbd888bb2a737508be9e3b2Bid156131712022-09-25 21:47:595 days 1 hr agoENS Name tmincey.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0.017 Ether0.00111683 15.02136814
0x563dba0f90029bfdb1a9bd2d0f34564c52aa494392faa925de075821a8ad8b18Signed Refund156079242022-09-25 4:13:355 days 19 hrs agoENS Name kylethornton.eth IN  0x1e4cc5f267853aa2e2142ea7f0532a776117cfff0 Ether0.00031482 6.17529429
[ Download CSV Export 
Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xeaaf62175616086118549041c77064a1c25918079d57f812b4805358bcd48f76156295802022-09-28 4:54:592 days 18 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name moredillon.eth0.0112 Ether
0xef87df3935f900229b9dda5bad7d324eff68338ee8bf336d155402d8931568e2156281262022-09-28 0:01:592 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name juanderer.eth0.01212121 Ether
0x39f793362b36ddda2d6f3941f7fd4e6fd4b61145f53f8a175fa905463a713ac2156209872022-09-27 0:02:233 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name juanderer.eth0.0201 Ether
0x563dba0f90029bfdb1a9bd2d0f34564c52aa494392faa925de075821a8ad8b18156079242022-09-25 4:13:355 days 19 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name kylethornton.eth0.0255 Ether
0x1da07b315f422442edef9478d59287bb12189fa50a80d5203dfd969ef1046af4156079222022-09-25 4:13:115 days 19 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name kylethornton.eth0.0143 Ether
0xe04cce96384afdc7a96212a99684a352411621ebde8a74a28dd2a7db5e8fc799155994942022-09-24 0:00:356 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name errorgardener.eth0.0101 Ether
0x69ee1b019b47dc234fb4ca3535f0a9e347b26754c9659b95d3b6a932115c9c8b155923302022-09-23 0:01:117 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name pugson.eth0.02 Ether
0x04a97d427386aee119eb14a9800c5f842d2864205eab9d7f2f329c4d29c0ba8b155786682022-09-21 1:50:119 days 21 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name errorgardener.eth0.0111 Ether
0x189fba04778520abf4c6035be4bc7966fdfa079668ad837a5d706f0218f2fc5b155719182022-09-20 3:08:3510 days 20 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name bloomy.eth0.011 Ether
0xb6ef63f0aed3401ed6e7be38c147ad5454357dcba4e4a837af4e7c701820c8e1155710062022-09-20 0:05:1110 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name errorgardener.eth0.01 Ether
0x7dd47a9ceed39325434c552e7330be28eb99d6d272627cc33f3a4045014772bd155651932022-09-19 4:29:5911 days 18 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name stardrop.eth0.017 Ether
0xc7304cd8dc34e45180ee3b082c2d22d5e36f6683a7f3365fdd290b23084689e8155527332022-09-17 10:33:3513 days 12 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name pugson.eth0.01248362 Ether
0x6feb29cb822d6db8d1bd6e0e8b7f7d9ac8e8b82ec628de054fb9d80998c64967155298452022-09-13 23:54:2616 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name softmoulding.eth0.0177 Ether
0x4da0f685689a7846e1346e27972107f8217288e2063b249f2030a5088a8d6d38155177622022-09-12 0:02:2018 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name juanderer.eth0.03333333 Ether
0xeb083664d3ac7a6844984f5d83934911995e9eca3247c5ebb9449d143afeef2b154994402022-09-08 23:28:4121 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name phenomenology.eth0.0333 Ether
0x64b9ebbb70be65ce4f8c8dc6215a496225683f577a945a9687948905100ad771154932952022-09-08 0:01:1422 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name juanderer.eth0.0251 Ether
0xdccd6d155d14c87fadc73e9c025b64a30a342f6153f0c7c209fb284c68ef8ca9154870752022-09-07 0:00:4523 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name errorgardener.eth0.01 Ether
0x5ac3d7a70c00eccdec258281cc8deaa4ba8e2baea66dedfe57cec27cbb07df3d154771482022-09-05 9:52:4225 days 13 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name jami.eth0.0274 Ether
0xac726de4b7c157a9147c03590f7872e6bdcc1784052170a599f17bb69f707432154771482022-09-05 9:52:4225 days 13 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name jami.eth0.015 Ether
0x3e61527a87de5272d339736a8aeb85659fd0ea201f2a08cd4bbffe0a949bed51154749972022-09-05 1:23:4825 days 21 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name stardrop.eth0.0166 Ether
0x22b788dccc3eeed4553a485505e43c4bee86e0fc82ec2da7f495aab8b2349ab2154746462022-09-05 0:00:2025 days 23 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name errorgardener.eth0.02 Ether
0xc85b8d968b2e54e83fbb4e4b7310cda1727171dad87e0a6c307545a2f1683fb6154721962022-09-04 14:42:1426 days 8 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name s3bby.eth0.04 Ether
0x5b28601112f186a4ea3ee8c206b9949e5a1a71781ee4db05d88159c596fb44b7154715152022-09-04 12:01:4126 days 11 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name pugson.eth0.02127463 Ether
0x62e689463c7a9670d08712d4e99d8b28156886ac318e23362083fb0dd76f5859154715152022-09-04 12:01:4126 days 11 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name pugson.eth0.018725 Ether
0x8855bed7505e0b3ffa77b98bff8feffee9bae9c6e1a72ed744de40b6cee13f73154406982022-08-30 13:47:3631 days 9 hrs ago 0x1e4cc5f267853aa2e2142ea7f0532a776117cfffENS Name softmoulding.eth0.027 Ether
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
MarsMaiers

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 1000 runs

Other Settings:
default evmVersion
File 1 of 14 : MarsMaiers.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

//
//
//
//	       #    #    ##    #####    ####       #    #    ##    #  ######  #####    ####
//	       ##  ##   #  #   #    #  #           ##  ##   #  #   #  #       #    #  #
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//	       #    #  ######  #####        #      #    #  ######  #  #       #####        #
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//	       #    #  #    #  #    #   ####       #    #  #    #  #  ######  #    #   ####
//
//
//
//                      .......                                    .......
//                .**'''        '''**,                       ***'''        '''**
//             **,.                   ,**                .**,                   .**,
//           /*,..                     ..**.           ,**..                     ..,**
//         **,......%##%... ....(###*.....,*/        ./*......(###*. . ....%##%......**,
//        /*,,,.....##(/........*(##,....,,,*/      ./*,,,....*#((,........((##.....,,,**
//       //*,,,,,,,..................,,,,,,,**/     /**,,,,,,,.................,,,,,,,,*/,
//       /****,,,,,,,,,,,,(..*,,,,,,,,,,,,,***/.   */***,,,,,,,,,,,,*,.,,,,,,,,,,,,,,***//
//       //***,,,,,,,,,,,%(..#%*,,,,,,,,,,****/,   */****,,,,,,,,,,/%,.,%#,,,,,,,,,,,***/(
//       (/****,,,,,,,,,,*/..*,,,,,,,,,,,****/(    ,//****,,,,,,,,,,(,.*,,,,,,,,,,,*****//
//       ,(/*****,,,,,,,**,,,.,,/,,,,,,*****///     ///****,,,,,,,,*,,,.,,*,,,,,,,*****/(.
//        *(/******,,,*/,.....*************///       (//******,,,(,.....,,*/***,*****//(.
//         .(//*******/,..,(,,****.*#****//(,         *(//******(,..,**,,///,,(/****//(
//           .(///***(,..,,(**/#,,%/**///(*             /(//***//,..,*/,/((,/#***///(
//              *(//(/,,,,,*(#*,/%(///(/                  .((//#*,,,,*/((**%#////(,
//                  *(,,,,,**/(%%#(*                           (*,,,,**/*%%%#(.
//                    /***/*                                    ,***//.
//
//
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//
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//
//
//

import '@openzeppelin/contracts/token/ERC721/ERC721.sol';
import '@openzeppelin/contracts/access/AccessControl.sol';
import '@openzeppelin/contracts/utils/cryptography/ECDSA.sol';
import '@openzeppelin/contracts/security/ReentrancyGuard.sol';

/// @custom:security-contact [email protected]
contract MarsMaiers is ERC721, AccessControl, ReentrancyGuard {
  using Address for address payable;
  using ECDSA for bytes32;

  /// can create refund approvals
  bytes32 public constant RECEIPT_SIGNER_ROLE = keccak256('RECEIPT_SIGNER_ROLE');

  /// can settle auctions
  bytes32 public constant SETTLER_ROLE = keccak256('SETTLER_ROLE');

  /// can withdraw winnings, and manage baseURI
  bytes32 public constant MANAGER_ROLE = keccak256('MANAGER_ROLE');

  uint256 private constant MIN_BID = 0.01 ether;

  string private baseURI = 'https://marsmaiers.com/tokenURI/';
  bool private baseURILocked = false;

  /// tracks withdrawable winnings
  uint256 private winnings;

  /// tracks cumulative total of bid tokens
  mapping(string => uint256) private bids;

  /// tracks addresses that control bids
  mapping(string => address) private bidders;

  // tracks if entire project has been minted
  bool private projectConcluded = false;

  // used to keep offchain store synchronized
  event BidPlaced(string bidToken, address bidder, uint256 value, uint256 total);
  event Refunded(string bidToken, address bidder, uint256 total);

  constructor() ERC721('Mars Maiers', 'MARS') {
    // grant deployer DEFAULT_ADMIN_ROLE and MANAGER_ROLE
    _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
    _grantRole(MANAGER_ROLE, msg.sender);
  }

  /// @notice allows changing baseURI to IPFS, after project is concluded
  /// @param uri new baseURI value
  /// @param lock passing "true" will freeze current baseURI value and block any future changes
  function setBaseURI(string memory uri, bool lock) external onlyRole(MANAGER_ROLE) {
    require(!baseURILocked, 'baseURI is locked');

    baseURI = uri;

    if (lock) {
      baseURILocked = true;
    }
  }

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

  /** requires an encrypted bidToken (generated on marsmaiers.com)

  ======================================
  == DO NOT CALL THIS METHOD DIRECTLY ==
  ======================================

  if you call this method directly (through etherscan or by hand), your bid
  will NOT be counted. your funds will be unrefundable, and you will have to
  wait for the project to be concluded, once refund() is available

  ======================================
  ==                                  ==
  ==    ONLY BID ON MARSMAIERS.COM    ==
  ==                                  ==
  ======================================
  **/
  function bid(string calldata bidToken) public payable {
    // validate input
    bytes memory bidTokenCheck = bytes(bidToken);
    require(bidTokenCheck.length > 0, 'invalid input');

    // ensure project is still ongoing
    require(!projectConcluded, 'project has concluded');

    // ensure bid meets min
    require(msg.value >= MIN_BID, 'below min bid');

    // if bidToken is already set, ensure _msgSender is the original bidder
    require(bidders[bidToken] == address(0x0) || bidders[bidToken] == _msgSender(), 'not your bid');

    // increment bidToken to new cumulative total
    bids[bidToken] = bids[bidToken] + msg.value;

    // mark _msgSender as bidder
    bidders[bidToken] = _msgSender();

    // emit event
    emit BidPlaced(bidToken, msg.sender, msg.value, bids[bidToken]);
  }

  /// returns bidder and bid total for a given bid token
  function getBidToken(string memory bidToken) public view returns (uint256, address) {
    return (bids[bidToken], bidders[bidToken]);
  }

  /// returns withdrawable winnings
  function getWinnings() public view returns (uint256) {
    return winnings;
  }

  /// @notice chooses a winner, and moves value ofbidToken to winnings
  /// @param tokenId day of year to mint
  /// @param bidToken winning bid token
  function settle(uint256 tokenId, string memory bidToken) public onlyRole(SETTLER_ROLE) {
    // validate input
    bytes memory bidTokenCheck = bytes(bidToken);
    require(tokenId >= 1 && tokenId <= 365 && bidTokenCheck.length > 0, 'invalid input');

    // no more winners allowed
    require(!projectConcluded, 'project has concluded');

    // look up bid total and winner by bidToken
    address winner = bidders[bidToken];
    uint256 amount = bids[bidToken];

    // ensure bidToken is not zero
    require(winner != address(0x0) && amount > 0, 'unknown bidToken');

    // zero bid
    bids[bidToken] = 0;

    // add amount to winnings
    winnings = winnings + amount;

    // close it up after final mint
    if (tokenId == 365) {
      projectConcluded = true;
    }

    // mint NFT to winner
    _safeMint(winner, tokenId);
  }

  /// @notice allows owner to cash out, from the designated winnings only
  /// @param amount value in wei to transfer
  /// @param to address to transfer funds to
  function withdraw(uint256 amount, address to) external onlyRole(MANAGER_ROLE) {
    require(amount > 0, 'invalid input');
    require(amount <= winnings, 'amount exceeds winnings');

    // subtract amount
    winnings = winnings - amount;

    // send funds to destination
    payable(to).sendValue(amount);
  }

  /// @notice transfers funds for a lost bid back to original bidder. requires a signed signature generated on marsmaiers.com
  /// @param bidToken bid token representing the lost bid you are refunding
  /// @param nonce nonce string, generated along with signature
  /// @param signature signature containing bidToken and nonce. generated on marsmaiers.com
  function signedRefund(
    string memory bidToken,
    string memory nonce,
    bytes memory signature
  ) public nonReentrant {
    // infer message by hashing input params. signature must contain a hash with the same message
    bytes32 message = keccak256(abi.encode(bidToken, nonce));

    // validate inferred message matches input params, and was signed by an address with RECEIPT_SIGNER_ROLE
    // if this passes we can trust the input params match
    require(hasRole(RECEIPT_SIGNER_ROLE, message.toEthSignedMessageHash().recover(signature)), 'invalid receipt');

    // execute refund
    _refund(bidToken);
  }

  /// @notice generic mechanism to return the value of a list of bidTokens to their original bidder. only enabled once project has concluded.
  /// @param bidTokens array of bid tokens to refund
  function refund(string[] memory bidTokens) public nonReentrant {
    // only allow unsigned refunds once project is concluded
    require(projectConcluded, 'project has not concluded');

    // execute refund for each bidToken
    for (uint256 i = 0; i < bidTokens.length; i++) {
      _refund(bidTokens[i]);
    }
  }

  /// allows *anyone* to mark the project as concluded, if the entire year has elapsed.
  /// this should normally never be needed, as minting the final piece also marks
  /// the project as concluded. in the unlikely event the final piece is never minted,
  /// this gives the community a way to release all pending bids.
  function concludeProject() public {
    // require block time to be after January 2, 2023 1:00:00 AM GMT (one day of buffer)
    require(block.timestamp > 1672621200, 'year is not over');

    // mark project as concluded
    projectConcluded = true;
  }

  // === PRIVATE ===

  // internal method to validate and process return a bid, using bidder and amount keyed to bidToken
  function _refund(string memory bidToken) private {
    // ensure bidToken exists with a balance, and was placed by _msgSender
    require(bids[bidToken] > 0, 'bid does not exist');

    // stash and zero bid
    uint256 amount = bids[bidToken];
    bids[bidToken] = 0;

    // don't zero bidder (prevents future reuse of bidToken)
    address bidder = bidders[bidToken];

    // emit event
    emit Refunded(bidToken, bidder, amount);

    // issue refund to bidder
    payable(bidder).sendValue(amount);
  }

  // === REQUIRED OVERRIDES ===

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

File 2 of 14 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

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

File 3 of 14 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 4 of 14 : ECDSA.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

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

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

File 5 of 14 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

File 6 of 14 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

File 7 of 14 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 8 of 14 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 14 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

File 10 of 14 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 11 of 14 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 12 of 14 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 13 of 14 : IAccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

File 14 of 14 : AccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

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

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"bidToken","type":"string"},{"indexed":false,"internalType":"address","name":"bidder","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"total","type":"uint256"}],"name":"BidPlaced","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"bidToken","type":"string"},{"indexed":false,"internalType":"address","name":"bidder","type":"address"},{"indexed":false,"internalType":"uint256","name":"total","type":"uint256"}],"name":"Refunded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"previousAdminRole","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"newAdminRole","type":"bytes32"}],"name":"RoleAdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MANAGER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"RECEIPT_SIGNER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SETTLER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"bidToken","type":"string"}],"name":"bid","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"concludeProject","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"bidToken","type":"string"}],"name":"getBidToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleAdmin","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getWinnings","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string[]","name":"bidTokens","type":"string[]"}],"name":"refund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","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":"string","name":"uri","type":"string"},{"internalType":"bool","name":"lock","type":"bool"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"string","name":"bidToken","type":"string"}],"name":"settle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"bidToken","type":"string"},{"internalType":"string","name":"nonce","type":"string"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"signedRefund","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":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"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":"uint256","name":"amount","type":"uint256"},{"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.