Contract 0xa6916545A56f75ACD43fb6A1527A73a41d2b4081 5

Token Contract 
 

Contract Overview

Demi-Human NFT: DEMI Token
Balance:
0 Ether

EtherValue:
$0.00

Token:
 
Txn Hash
Method
Block
From
To
Value
0x55dbd0a2d67416d5bbe5520cbbee295c0b2fba592d2a7ea7bc3caa89b9d449a6Set Approval For...161293352022-12-07 0:28:1110 hrs 13 mins ago0x2f9135ad7f6c6453264204df89d838cc62f0eb51 IN  Demi-Human NFT: DEMI Token0 Ether0.000685 14.68432089
0x32b8852b5bfc6a67a836062527a8e400b2cb8d26860fa4cc9b2618f06f8f3a39Safe Transfer Fr...161291422022-12-06 23:49:3510 hrs 52 mins ago0xd6a89047dd0d47cf30c99fc36265d2266d0614d7 IN  Demi-Human NFT: DEMI Token0 Ether0.00113587 12.84848946
0xbf68675b9b8485f2883a9749c9fd3212ff5c11cbe615f545b9130c3446c36f35Set Approval For...161281362022-12-06 20:27:1114 hrs 14 mins ago0x9167564514b2bebc996667f9c3c7b7bf14a28d33 IN  Demi-Human NFT: DEMI Token0 Ether0.00066971 14.35637166
0x28dd98121269fd83cfc35858ba88f961899621eb316fa8af5ca6514a4d3aeba5Safe Transfer Fr...161280752022-12-06 20:14:4714 hrs 26 mins ago0x34f984508e48014568a9694f8ed26a3e1ea5ca50 IN  Demi-Human NFT: DEMI Token0 Ether0.00385611 43.61872354
0x4ff40a917ff4ad18c6a336b95f481f99a2a590a3fc89d1ad26c6d3af7c66b059Safe Transfer Fr...161264032022-12-06 14:38:5920 hrs 2 mins ago0xe96d429c22e6c63c75c2411421cfa7d36b452e17 IN  Demi-Human NFT: DEMI Token0 Ether0.00165028 18.08150403
0x1913cf7cf42535da778a6c6e9f2e45b9c7a44f5738893414315ee16c82db1e1eSet Approval For...161218472022-12-05 23:24:351 day 11 hrs ago0x08c30274c7dc71dfad08209431eae9e87c3a3f6f IN  Demi-Human NFT: DEMI Token0 Ether0.00065633 14.0443484
0xdf416d56dbe02e5ea06ec8bda6f8586b73f285c4caa665ba110e7819c69a1cb8Set Approval For...161218452022-12-05 23:24:111 day 11 hrs ago0x08c30274c7dc71dfad08209431eae9e87c3a3f6f IN  Demi-Human NFT: DEMI Token0 Ether0.00059645 12.7630576
0x3fc36663f5f7c272072cd283a0109b20c5af7d30d43051f607021b32cdf8b78aTransfer From161198972022-12-05 16:51:231 day 17 hrs ago0xf27bc7f1ca7bd6a943d9e5bd84fa948e23c113e4 IN  Demi-Human NFT: DEMI Token0 Ether0.0012574 14.72131712
0xab9aef6da0cc5faeb1ccc23719cd9a7295e0fd988c3a8886fd96c9c91128abe2Set Approval For...161117282022-12-04 13:25:472 days 21 hrs ago0x12888d2fb9919e4d80abecf9f0af962fd622d2a3 IN  Demi-Human NFT: DEMI Token0 Ether0.0006064313
0x7802414b592da56b378e302d8b0d0f5e706f0756dcb1a84efa1d980c72853fa4Safe Transfer Fr...161092212022-12-04 5:00:233 days 5 hrs ago0xd6a89047dd0d47cf30c99fc36265d2266d0614d7 IN  Demi-Human NFT: DEMI Token0 Ether0.001620
0xce89acdda151dc3b6a2d7cc0f14d8ef4cd0bdef9a0fc93e77ea42fb355759b21Safe Transfer Fr...161003622022-12-02 23:19:354 days 11 hrs ago0x9a9e6f622b91bc6733aea49c2c03b8cf3f312f5b IN  Demi-Human NFT: DEMI Token0 Ether0.00357017 40.3842739
0x000f1f144dcf242afd0d7219628f01b31df2b56e3195c78484d0d660661f2bc4Set Approval For...160868452022-12-01 2:03:236 days 8 hrs ago0x1c6523a24117186ff14ab0c57bf17dfc559e874b IN  Demi-Human NFT: DEMI Token0 Ether0.00057876 12.40682582
0x21678838bc547d99f762a10b414e393587a7d857fa5e88b5fec76849a1494116Set Approval For...160816832022-11-30 8:42:477 days 1 hr agoENS Name firstoftheyear.eth IN  Demi-Human NFT: DEMI Token0 Ether0.00030426 12.25840465
0x392383da3b0600ab5feca0822028e474b1e2c76349d3e6c042361993bc333eaaSafe Transfer Fr...160765822022-11-29 15:36:117 days 19 hrs ago0xadab804dbe8866515d919d47a06c42ca6dd8f6fd IN  Demi-Human NFT: DEMI Token0 Ether0.00142694 14.04359377
0xb8bea12f6b8ff4bd2bf7c3cc89e613dd130edba6c1d3b089d9e4823cfa09fc60Safe Transfer Fr...160765402022-11-29 15:27:357 days 19 hrs ago0x4eb4c948143afabb920f0b4af75e691e91c097a6 IN  Demi-Human NFT: DEMI Token0 Ether0.00115916 11.40681889
0xca52a07d3b086ea2c471388fbb4ecf807480e47d3785f37c64fa251474cb5e75Set Approval For...160611252022-11-27 11:48:359 days 22 hrs ago0x0bc1ca13a06f6d13f0b67ce451379c9468cd5e4f IN  Demi-Human NFT: DEMI Token0 Ether0.00053667 11.50444853
0x697a8f0dee28fe19b2df609496d3598f3a177f7467b4da91e16de46e397d096cSet Approval For...160594762022-11-27 6:17:3510 days 4 hrs ago0x29591eeb57aa0ce30b4f59aa70fd7b9d5ba227fe IN  Demi-Human NFT: DEMI Token0 Ether0.000417368.94685092
0x4c727382c08938459bd1bab8b1017fb9752e767a04baa1ed595a3ba15f4b50ffSafe Transfer Fr...160592372022-11-27 5:29:3510 days 5 hrs ago0x4f2967ecaca2284eda1f7c2b8fd795e1c543b9b9 IN  Demi-Human NFT: DEMI Token0 Ether0.0009724511
0x2c0e78b2896c34bf0bcd034e09aaf1f4fcbdf24e31ef6e633ad9921b9fd9f10eSet Approval For...160584392022-11-27 2:49:4710 days 7 hrs agoENS Name bayc8420.eth IN  Demi-Human NFT: DEMI Token0 Ether0.00028275 11.39190111
0x42eda51f1db035d0bbe30f72a71357f8a81f979bffe56d91af1173b7b503e3f6Set Approval For...160583142022-11-27 2:24:4710 days 8 hrs ago0x46bed4145462c25f200e13fa1fc5c9444a7e3e58 IN  Demi-Human NFT: DEMI Token0 Ether0.00045705 9.79780936
0x71dc96f2b9e966773abe76e8a960a8b68205621aed02fe962b845ef22bd7b097Set Approval For...160524302022-11-26 6:40:2311 days 4 hrs ago0x0b0d8c9dd82ac564aada158aa01dff69e5620fc9 IN  Demi-Human NFT: DEMI Token0 Ether0.0005456 11.69601149
0xfb11d636e991cde64bd0a352c94d2cb87444bc0c60495b7b8c874c988ae94a21Set Approval For...160514542022-11-26 3:24:1111 days 7 hrs ago0x36b7259a40eb2efe6b6e77f74351f51bf587260e IN  Demi-Human NFT: DEMI Token0 Ether0.00040477 8.67704349
0xdb7b242bd23331be4e44b3cf0654470b5d766289e006012f09ef58fb48c168f4Safe Transfer Fr...160512052022-11-26 2:34:1111 days 8 hrs ago0xb1172deea0ae29fc004f99dccf1c240b96ca9a2b IN  Demi-Human NFT: DEMI Token0 Ether0.00098904 11.18922097
0x25b23a85276b65cea0330c652606eb3ef6babe36dc00a631ea782097d55f2a5cSet Approval For...160450222022-11-25 5:50:1112 days 4 hrs ago0xaed02ffebbeb0580c480a8448d2fb291f2df1dad IN  Demi-Human NFT: DEMI Token0 Ether0.0005131311
0x949a11708b9b97072cf6e0bd2c0606090b9ff8a06f89139b39b6779036a0b493Set Approval For...160421932022-11-24 20:21:1112 days 14 hrs ago0xa75e1e40ac06624ed65cb16c77b089be18acb6bd IN  Demi-Human NFT: DEMI Token0 Ether0.00053028 11.36748905
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OVERVIEW

DemiHuman is a collection of NFT's.

Latest 16 internal transactions
Parent Txn Hash Block From To Value
0x622752dbbee625ac19fa5123493a09bb3384dd7148677b76d0a2608542335719138559832021-12-22 16:09:03349 days 18 hrs ago Demi-Human NFT: DEMI Token0x1a336ac6b4e75933aa8e179e9917871b6297d85f111.2 Ether
0x622752dbbee625ac19fa5123493a09bb3384dd7148677b76d0a2608542335719138559832021-12-22 16:09:03349 days 18 hrs ago Demi-Human NFT: DEMI Token0xff626ae456cd4296e54c096f8bea3a2ed1439243111.2 Ether
0x622752dbbee625ac19fa5123493a09bb3384dd7148677b76d0a2608542335719138559832021-12-22 16:09:03349 days 18 hrs ago Demi-Human NFT: DEMI TokenENS Name ccie11440.eth111.2 Ether
0x622752dbbee625ac19fa5123493a09bb3384dd7148677b76d0a2608542335719138559832021-12-22 16:09:03349 days 18 hrs ago Demi-Human NFT: DEMI TokenDemi-Human NFT: Deployer111.2 Ether
0xa5863497cd7b7007d6627fb8eb99576f3e1739ad58ee6610e28427cb0e8b7179137782862021-12-10 15:46:07361 days 18 hrs ago Demi-Human NFT: DEMI Token0x1a336ac6b4e75933aa8e179e9917871b6297d85f48.86 Ether
0xa5863497cd7b7007d6627fb8eb99576f3e1739ad58ee6610e28427cb0e8b7179137782862021-12-10 15:46:07361 days 18 hrs ago Demi-Human NFT: DEMI Token0xff626ae456cd4296e54c096f8bea3a2ed143924348.86 Ether
0xa5863497cd7b7007d6627fb8eb99576f3e1739ad58ee6610e28427cb0e8b7179137782862021-12-10 15:46:07361 days 18 hrs ago Demi-Human NFT: DEMI TokenENS Name ccie11440.eth48.86 Ether
0xa5863497cd7b7007d6627fb8eb99576f3e1739ad58ee6610e28427cb0e8b7179137782862021-12-10 15:46:07361 days 18 hrs ago Demi-Human NFT: DEMI TokenDemi-Human NFT: Deployer48.86 Ether
0x04a1f5d650e7ade7979c8964affd6e512e8fff0222d3262818dc7536e4fdba85137155282021-11-30 15:24:36371 days 19 hrs ago Demi-Human NFT: DEMI Token0x1a336ac6b4e75933aa8e179e9917871b6297d85f14.46 Ether
0x04a1f5d650e7ade7979c8964affd6e512e8fff0222d3262818dc7536e4fdba85137155282021-11-30 15:24:36371 days 19 hrs ago Demi-Human NFT: DEMI Token0xff626ae456cd4296e54c096f8bea3a2ed143924314.46 Ether
0x04a1f5d650e7ade7979c8964affd6e512e8fff0222d3262818dc7536e4fdba85137155282021-11-30 15:24:36371 days 19 hrs ago Demi-Human NFT: DEMI TokenENS Name ccie11440.eth14.46 Ether
0x04a1f5d650e7ade7979c8964affd6e512e8fff0222d3262818dc7536e4fdba85137155282021-11-30 15:24:36371 days 19 hrs ago Demi-Human NFT: DEMI TokenDemi-Human NFT: Deployer14.46 Ether
0xe3130b3f36347ce3084382712b50ae796976f2009834b0850ebfcb5689555b1b136338342021-11-17 15:40:26384 days 19 hrs ago Demi-Human NFT: DEMI Token0x1a336ac6b4e75933aa8e179e9917871b6297d85f9.14 Ether
0xe3130b3f36347ce3084382712b50ae796976f2009834b0850ebfcb5689555b1b136338342021-11-17 15:40:26384 days 19 hrs ago Demi-Human NFT: DEMI Token0xff626ae456cd4296e54c096f8bea3a2ed14392439.14 Ether
0xe3130b3f36347ce3084382712b50ae796976f2009834b0850ebfcb5689555b1b136338342021-11-17 15:40:26384 days 19 hrs ago Demi-Human NFT: DEMI TokenENS Name ccie11440.eth9.14 Ether
0xe3130b3f36347ce3084382712b50ae796976f2009834b0850ebfcb5689555b1b136338342021-11-17 15:40:26384 days 19 hrs ago Demi-Human NFT: DEMI TokenDemi-Human NFT: Deployer9.14 Ether
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
DemiHuman

Compiler Version
v0.8.0+commit.c7dfd78e

Optimization Enabled:
Yes with 200 runs

Other Settings:
byzantium EvmVersion
File 1 of 14 : DemiHuman.sol
// SPDX-License-Identifier: MIT
/*  
   
   █▀▀▄	 ▐▌▀▀   ██   ██   ▐▌
   █   ▌ ▐▌▀▀  ▐▌ ▀▌▀ ▐▌  ▐▌
   █▄▄▀	 ▐▌▄▄  ▐▌  ▀  ▐▌  ▐▌

    DemiVerse Studio - DemiHumanNFTs / 2021 
*/

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';
import '@openzeppelin/contracts/utils/math/SafeMath.sol';

abstract contract BAYCFriend {
  function balanceOf(address owner) external virtual view returns (uint256 balance);
}

abstract contract MAYCFriend {
  function balanceOf(address owner) external virtual view returns (uint256 balance);
}

abstract contract CoolCatsFriend {
  function balanceOf(address owner) external virtual view returns (uint256 balance);
}

contract DemiHuman is ERC721, ERC721Enumerable, Ownable {
    
  using SafeMath for uint256;
  using Strings for uint256;

  BAYCFriend private bayc;
  MAYCFriend private mayc;  
  CoolCatsFriend private cool;
  
  bool private _isPreSaleD1Active = false;
  bool private _isPreSaleD2Active = false;
  bool private _isPublicSaleActive = false;
  
  uint256 public offsetIndex = 0;
  uint256 public revealTimeStamp = block.timestamp + (86400 * 12); 
  uint256 public constant PRICE = .08 ether;
  uint256 public constant MAX_SUPPLY = 10000;

  string private _baseURIExtended;
  string private _preRevealURI;

  address private s1 = 0x819A899c0325342CD471A485c1196d182F85860D ;
  address private s2 = 0x295fF892A2B5941ED26Ff8a10FEcF90554092719 ;
  address private s3 = 0xFF626Ae456Cd4296E54C096f8BEa3a2Ed1439243 ;
  address private s4 = 0x1A336Ac6B4e75933AA8e179E9917871b6297d85f ;

  mapping(address => bool) private _allowList; 
  mapping(address => bool) private _blackList;
  
  modifier onlyShareHolders() {
        require(msg.sender == s1 || msg.sender == s2 || msg.sender == s3 || msg.sender == s4);
        _;
    }

  modifier onlyRealUser() {
    require(msg.sender == tx.origin, "Oops. Something went wrong !");
    _;
  }
  
  event PreSaleD1_Started();
  event PreSaleD1_Stopped();
  event PreSaleD2_Started();
  event PreSaleD2_Stopped();
  event PublicSale_Started();
  event PublicSale_Stopped();
  event TokenMinted(uint256 supply);

  constructor(address dependentContractAddress1, address dependentContractAddress2, address dependentContractAddress3) 
  ERC721('DemiHuman', 'DEMI') {
      bayc = BAYCFriend(dependentContractAddress1);
      mayc = MAYCFriend(dependentContractAddress2);
      cool = CoolCatsFriend(dependentContractAddress3);
  }

  function addToAllowList(address[] calldata addresses) external onlyOwner {
    for (uint256 i = 0; i < addresses.length; i++) {
      require(addresses[i] != address(0), "Can't add the null address");
      _allowList[addresses[i]] = true;
    }
  }

  function removeFromAllowList(address[] calldata addresses) external onlyOwner {
    for (uint256 i = 0; i < addresses.length; i++) {
      require(addresses[i] != address(0), "Can't add the null address");
      _allowList[addresses[i]] = false;
    }
  }
  
  function onAllowList(address addr) external view returns (bool) {
    return _allowList[addr];
  }
  
  function startPreSaleD1() public onlyOwner {
    _isPreSaleD1Active = true;
    emit PreSaleD1_Started();
  }

  function pausePreSaleD1() public onlyOwner {
    _isPreSaleD1Active = false;
    emit PreSaleD1_Stopped();
  }

  function isPreSaleD1Active() public view returns (bool) {
    return _isPreSaleD1Active;
  }
  
  function startPreSaleD2() public onlyOwner {
    _isPreSaleD2Active = true;
    emit PreSaleD2_Started();
  }

  function pausePreSaleD2() public onlyOwner {
    _isPreSaleD2Active = false;
    emit PreSaleD2_Stopped();
  }

  function isPreSaleD2Active() public view returns (bool) {
    return _isPreSaleD2Active;
  }

  function startPublicSale() public onlyOwner {
    _isPublicSaleActive = true;
    emit PublicSale_Started();
  }

  function pausePublicSale() public onlyOwner {
    _isPublicSaleActive = false;
    emit PublicSale_Stopped();
  }

  function isPublicSaleActive() public view returns (bool) {
    return _isPublicSaleActive;
  }
  

  function withdraw() public onlyShareHolders {
    uint256 _each = address(this).balance / 4;
    require(payable(s1).send(_each), "Send Failed");
    require(payable(s2).send(_each), "Send Failed");
    require(payable(s3).send(_each), "Send Failed");
    require(payable(s4).send(_each), "Send Failed");
  }
  
  function getTotalSupply() public view returns (uint256) {
    return totalSupply();
  }

  function getTokenByOwner(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 mint_presaled1(uint8 NUM_TOKENS_MINT) public payable onlyRealUser {
    require(_isPreSaleD1Active, "Sales is not active");
    require(totalSupply().add(NUM_TOKENS_MINT) <= 9612, "Exceeding max supply");
    require(_allowList[msg.sender], "You are not in the allowList");
    require(NUM_TOKENS_MINT <= 2, "You can not mint over 2 at a time");
    require(NUM_TOKENS_MINT > 0, "At least one should be minted");
    require(PRICE*NUM_TOKENS_MINT <= msg.value, "Not enough ether sent");
    _allowList[msg.sender] = false ;
    _mint(NUM_TOKENS_MINT, msg.sender);
    emit TokenMinted(totalSupply());
  }
  
  function mint_presaled2(uint8 NUM_TOKENS_MINT) public payable onlyRealUser {
    require(_isPreSaleD2Active, "Sales is not active");
    require(totalSupply().add(NUM_TOKENS_MINT) <= 9612, "Exceeding max supply");
    require(_blackList[msg.sender] == false, "You have already minted"); 
    uint bayc_balance = bayc.balanceOf(msg.sender);
    uint mayc_balance = mayc.balanceOf(msg.sender);
    uint cool_balance = cool.balanceOf(msg.sender);
    require(bayc_balance > 0 || mayc_balance > 0 || cool_balance > 0, "You must hold at least one BAYC/MAYC/CoolCats");
    require(NUM_TOKENS_MINT <= 2, "You can not mint over 2 at a time");
    require(NUM_TOKENS_MINT > 0, "At least one should be minted");
    require(PRICE*NUM_TOKENS_MINT <= msg.value, "Not enough ether sent");
    _blackList[msg.sender] = true;
    _mint(NUM_TOKENS_MINT, msg.sender);
    emit TokenMinted(totalSupply());
  }
  
  function mint_public(uint8 NUM_TOKENS_MINT) public payable onlyRealUser {
    require(_isPublicSaleActive, "Sales is not active");
    require(totalSupply().add(NUM_TOKENS_MINT) <= 9612, "Exceeding max supply");
    require(NUM_TOKENS_MINT <= 10, "You can not mint over 10 at a time");
    require(NUM_TOKENS_MINT > 0, "At least one should be minted");
    require(PRICE*NUM_TOKENS_MINT <= msg.value, "Not enough ether sent");
    _mint(NUM_TOKENS_MINT, msg.sender);
    emit TokenMinted(totalSupply());
  }
  
  function reserve(uint256 num) public onlyOwner {
    require(totalSupply().add(num) <= MAX_SUPPLY, "Exceeding max supply");
    _mint(num, msg.sender);
    emit TokenMinted(totalSupply());
  }

  function airdrop(uint256 num, address recipient) public onlyOwner {
    require(totalSupply().add(num) <= MAX_SUPPLY, "Exceeding max supply");
    _mint(num, recipient);
    emit TokenMinted(totalSupply());
  }
  
  function airdropToMany(address[] memory recipients) external onlyOwner {
    require(totalSupply().add(recipients.length) <= MAX_SUPPLY, "Exceeding max supply");
    for (uint256 i = 0; i < recipients.length; i++) {
      airdrop(1, recipients[i]);
    }
  }

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

  function setRevealTimestamp(uint256 newRevealTimeStamp) external onlyOwner {
    revealTimeStamp = newRevealTimeStamp;
  }

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

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

  function setPreRevealURI(string memory preRevealURI) external onlyOwner {
    _preRevealURI = preRevealURI;
  }

  function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
    require(_exists(tokenId), 'ERC721Metadata: URI query for nonexistent token');
    if (totalSupply() >= MAX_SUPPLY || block.timestamp >= revealTimeStamp) {
      if (tokenId < MAX_SUPPLY) {
        uint256 offsetId = tokenId.add(MAX_SUPPLY.sub(offsetIndex)).mod(MAX_SUPPLY);
        return string(abi.encodePacked(_baseURI(), offsetId.toString(), ".json"));
      } } 
      else {
      return _preRevealURI;
    }
  }

  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 14 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 3 of 14 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

File 4 of 14 : ERC165.sol
// SPDX-License-Identifier: MIT

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 5 of 14 : Strings.sol
// SPDX-License-Identifier: MIT

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

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

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

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 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

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);
}

File 10 of 14 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT

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 11 of 14 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

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 12 of 14 : IERC721.sol
// SPDX-License-Identifier: MIT

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 13 of 14 : ERC721.sol
// SPDX-License-Identifier: MIT

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

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);
    }

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

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

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

File 14 of 14 : Ownable.sol
// SPDX-License-Identifier: MIT

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() {
        _setOwner(_msgSender());
    }

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

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

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

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

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

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

Contract Security Audit

Contract ABI

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

000000000000000000000000bc4ca0eda7647a8ab7c2061c2e118a18a936f13d00000000000000000000000060e4d786628fea6478f785a6d7e704777c86a7c60000000000000000000000001a92f7381b9f03921564a437210bb9396471050c

-----Decoded View---------------
Arg [0] : dependentContractAddress1 (address): 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D
Arg [1] : dependentContractAddress2 (address): 0x60E4d786628Fea6478F785A6d7e704777c86a7c6
Arg [2] : dependentContractAddress3 (address): 0x1A92f7381B9F03921564a437210bB9396471050C

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000bc4ca0eda7647a8ab7c2061c2e118a18a936f13d
Arg [1] : 00000000000000000000000060e4d786628fea6478f785a6d7e704777c86a7c6
Arg [2] : 0000000000000000000000001a92f7381b9f03921564a437210bb9396471050c


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.