Contract 0x7E5935eA00b69b0AC8978F35Cb079ef38217e181 4

 
Txn Hash
Method
Block
From
To
Value
0x91796b4ae544549e5e5c65f45aaeac29ddab6de4973e38dc437ab70f4c39067cSet Approval For...155814432022-09-21 11:25:477 days 12 hrs ago0x87af71ffa2051dc58bbc2da8fdacbc036b701788 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00018089 3.88036597
0x444ad91e39167f6280f48c3a384d9448c3c9253a781197d1246b583a90b1f50bSet Approval For...155236782022-09-12 23:30:3516 days 13 mins agoENS Name fractvl.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00025712 10.37187635
0x8ab884b1600e7c8cad405a1f457dd8b5fc86374daa31aa55836b8dfb0e2e7e86Set Approval For...154350872022-08-29 16:11:3630 days 7 hrs agoENS Name cryptoyang.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00076548 28.57243593
0x21036b5ff8cb9c924e5dc529baedaf866222f6af9cf08ba3ecd0060ca1d49af8Set Approval For...154350852022-08-29 16:11:0930 days 7 hrs agoENS Name cryptoyang.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00061842 24.94565415
0x407611feb53902cd81a9ab50cff348de2b4011b073af73494359ad816e881bf7Transfer From153862642022-08-21 21:12:2238 days 2 hrs ago0x4055deff8e27593454c9130db06927b977efd3e5 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00063432 7.46505124
0x22871e9950c1095e2d5418a8cae830e6902a5dabb071e242c20e08bdf0c544c3Set Approval For...153826872022-08-21 7:37:5438 days 16 hrs agoENS Name adviceresistant.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00021015 4.50792622
0x84d28b31846fe5cb87b1029ce39b75de352c9d48d88ab131fd78e85497ec7087Set Approval For...153165912022-08-10 20:55:1649 days 2 hrs ago0xb4683dffed6dcf3f3c5c046c2592880f0b4f3fb2 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00147081 31.49293281
0xdad94f23cacf2ed4bfd0db5cded8b0f9fbab4d1ec557783c404240615ff177baSet Approval For...153004562022-08-08 8:21:1151 days 15 hrs agoENS Name dinorug.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00047363 10.15965732
0xb196ec02e87407da5f9a6c661f81fda4227da7b6eb7f899a2ed68e52f5c10737Set Approval For...152399892022-07-29 22:08:2961 days 1 hr agoENS Name *mæstro.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00049216 10.557073
0xac2bf6afb93ce299ef1554544fba1c7918da500afa5e4cfd65261008e9e42740Transfer From152393692022-07-29 19:49:1061 days 3 hrs agoENS Name garethservant.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00109398 12.46391907
0xf1ed9997260cc212b1a4952443b55a5edf2cb71c176117835eaea313b3c5cd41Transfer From152182202022-07-26 12:54:0464 days 10 hrs agoENS Name boscage.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00103925 10.58016789
0x5666860fc4548b38127f68b99eaf552b6a34042f200f8a0bf432ad554e9e9c51Set Approval For...152035962022-07-24 6:02:3666 days 17 hrs ago0xd156b366b98fc09a3289754a22eb7990014c7ef4 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00013832 5.57961588
0x09a6e09bf9da2166a9511e5a111f9600b484ac68ee2fc35650cf02f5ac4dc57bSet Approval For...152035962022-07-24 6:02:3666 days 17 hrs ago0xd156b366b98fc09a3289754a22eb7990014c7ef4 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00013748 5.54587488
0x30914ca9de8d092f0b2b30ff0d2f98b4c8dbdf425fc3032b3c7ca5582c78a21cSet Approval For...151950772022-07-22 22:11:3468 days 1 hr agoENS Name nicolassassoon.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00086421 18.50448032
0x266fe2193665ae1aeac7c28d61d82b8613dbb9e5d004a52845775af604eeec54Set Approval For...151890572022-07-21 23:52:1768 days 23 hrs agoENS Name rastereyes.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00043906 17.71071735
0xab9d7eff8739be1b9bdae3844c1e4a99680983b340af6cffb6b25e95215494c9Set Approval For...151874322022-07-21 18:03:5469 days 5 hrs ago0xc6779345a64af80af2b4ed2e37b0c9c508a5fe27 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00105573 22.64595326
0x535be43844ee66857325a31b0822db8eb4080bf1b54efd3cb160dd930490ed3bSet Approval For...151855082022-07-21 10:59:3269 days 12 hrs agoENS Name dame.eth IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00050731 10.86258924
0xd41479550d0e09f02cc7bbab02677b56aabfceb83b0b22c50db7edbaf5cdad2bTransfer From151849272022-07-21 8:44:4369 days 14 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00072532 8.26375588
0xa43c4377e80d626be31bc989978efdbdc6f8c5a3a8ada72f69495eadb2f4d3f2Transfer From151849222022-07-21 8:44:1069 days 14 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00098025 9.97945343
0x6263e945711eaabf8eaf7420517b4f6a18b719f17401f17e6732f8c9ff25cc65Transfer From151849212022-07-21 8:44:0069 days 15 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00077658 9.03775839
0x81e2183ae20692ec5a1c2547341db72f902eb73955b2881c4a7148b9f099ce21Transfer From151849202022-07-21 8:43:4369 days 15 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00079625 9.26668626
0x6ab51a9cea89f08c5a331551f9e4fb537b9e43c6ae47328cf19f24aef5786394Claim151849052022-07-21 8:40:5669 days 15 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810.025 Ether0.0019032 12.39201877
0xb00c9656d9ac24cf254942aa35c80d04a841c710a65ca43a40cb5edfa8ab5697Claim151849032022-07-21 8:40:4669 days 15 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810.025 Ether0.00185724 12.09276353
0xcb16238559cd36fb9e9d6e70b563e5dff5e39d68136d76475145084f9ef8ba7cClaim151849012022-07-21 8:39:4069 days 15 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810.025 Ether0.00178843 11.86095859
0xf946fc1a0c76307ffb18e094683271ca0b7d583a0ef2036a96f7738934b69f6aTransfer From151844162022-07-21 6:51:5569 days 16 hrs ago0x6e31d9d4ed8ed93c2871ffb320f68b3cb4e81a25 IN  0x7e5935ea00b69b0ac8978f35cb079ef38217e1810 Ether0.00120504 13.72925985
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0x33ed0f0257404f172f5b69b2fdbd5f0d69ab986af455355e27cea276adc5b772144121142022-03-18 18:41:19194 days 5 hrs ago 0x7e5935ea00b69b0ac8978f35cb079ef38217e1810xbd78a58047c471cc5e940306eac3e8e4d287823315 Ether
0x6e256357f290a6030a5f5170e531041ce75ca479c7e30f1fb14a11a7ce1af94d144121082022-03-18 18:39:34194 days 5 hrs ago 0x7e5935ea00b69b0ac8978f35cb079ef38217e1810xe74d4975900aba193524844e6c2075de3a65a72015 Ether
0x62a18c7e028acf62376ebed6eb56bc3002785cd2f2e9f9f5d3b309cf8a595bef144120942022-03-18 18:36:02194 days 5 hrs ago 0x7e5935ea00b69b0ac8978f35cb079ef38217e1810xbd78a58047c471cc5e940306eac3e8e4d28782335 Ether
0xbd8fc8b6504723943b1dbafa5d83d67f9325995c85011a037bf671cfc964f016144120752022-03-18 18:32:39194 days 5 hrs ago 0x7e5935ea00b69b0ac8978f35cb079ef38217e1810xe74d4975900aba193524844e6c2075de3a65a7205 Ether
0x116b23a840997c5280a1c69846109c8f16bf1ecbbeb0ba62581a655a24f93a84144120032022-03-18 18:18:17194 days 5 hrs ago 0x7e5935ea00b69b0ac8978f35cb079ef38217e1810xbd78a58047c471cc5e940306eac3e8e4d28782330.1 Ether
0x02f8cae105a7636d7714d210c5c3681f9f31a73bc136cb147d47faebcc215b57144119772022-03-18 18:13:33194 days 5 hrs ago 0x7e5935ea00b69b0ac8978f35cb079ef38217e1810xe74d4975900aba193524844e6c2075de3a65a7200.1 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
VariousBooks

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 15 : VariousBooks.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

contract VariousBooks is ERC721Enumerable, ReentrancyGuard, Ownable {
  using Counters for Counters.Counter;

  uint256 public constant mintPrice = 25000000000000000;
  bool public saleIsActive = false;
  Counters.Counter private _tokenIdCounter;

  string[] private nouns = [ 
    "Abyss", "Addiction", "Affairs", "Ages", "Animals", "Answer", "Approach", "Arrangement", 
    "Art", "Ashes", "Beauties", "Beginnings", "Birch", "Blossom", "Body", "Books", 
    "Book", "Botany", "Bounty", "Buffalo", "Centuries", "Cities", "City", "Civilization", 
    "Clouds", "Coast", "Continuum", "Corn", "Courage", "Cowboy", "Crows", "Crystals", 
    "Cults", "Darkness", "Days", "Delegation", "Desert", "Destiny", "Development", "Distance", 
    "Division", "Doves", "Dreamer", "Dreams", "Dunes", "Eagle", "Earth", "Elegance", 
    "End", "Environments", "Excavations", "Eye", "Fall", "Fantasies", "Fire", "Fish", 
    "Flame", "Folklore", "Fools", "Force", "Fraud", "Frost", "Future", "Games", 
    "Gemstones", "Goddess", "Grain", "History", "Illusion", "Interaction", "Introduction", 
    "Jury", "Knowledge", "Labours", "Land", "Law", "Legends", "Life", "Light", "Maps", 
    "Masterpieces", "Meadow", "Meditations", "Memoirs", "Memory", "Mist", "Moon", "Mountains", 
    "Mushrooms", "Mysteries", "Mystery", "Network", "Night", "Oasis", "Oceans", 
    "Owls", "Painting", "Palace", "Parrots", "Past", "Patterns", "Peach", "Persona", 
    "Perspective", "Petals", "Planet", "Plants", "Plays", "Poison", "Poetics", "Prehistory", 
    "Problems", "Procedures", "Prophecy", "Purpose", "Quarrel", "Rain", "Reality", "Report", 
    "Republic", "Rescue", "Revolution", "Rice", "River", "Rivers", "Ruins", "Rules", 
    "Seashells", "Seasons", "Serpent", "Shadow", "Sheep", "Ships", "Shores", "Sky", 
    "Smoke", "Snow", "Space", "Spaces", "Sparrow", "Spectrum", "Spirit", "Spirits", 
    "Spring", "Stars", "State", "States", "Steppes", "Stories", "Storm", "Strategies", 
    "Streams", "Structures", "Summer", "Sun", "Surroundings", "Systems", "Tactics", "Tears", 
    "Techniques", "Thorn", "Thought", "Thoughts", "Throne", "Time", "Toad", "Treasures", 
    "Trees", "Tundra", "Valleys", "Vision", "Voices", "Volcanoes", "Wanderer", "Water", 
    "Ways", "Whisper", "Wildflowers", "Wind", "Wings", "Winter", "World", "Worlds", "Years"
  ];

  string[] private adjectives = [
    "Academic", "Ancient", "Basic", "Big", "Burning", "Bright", "Broken", "Bronze", 
    "Cold", "Complete", "Concise", "Consolidated", "Contemporary", "Continuous", "Cursed", "Cyber", 
    "Eastern", "Elemental", "Emerald", "Experimental", "Fallen", "First", "Forgotten", "Frozen", 
    "Fundamental", "Golden", "Greater", "Hardcore", "Hidden", "High", "Historic", "Holistic", 
    "Haunted", "Illustrated", "Informational", "Instant", "Little", "Living", "Lonely", "Lost", 
    "Lunar", "Magnetic", "Misty", "Modern", "New", "Northern", "Phantom", "Polar", 
    "Psychological", "Pure", "Quantum", "Romantic", "Rough", "Sacred", "Secret", "Silent", 
    "Simple", "Solar", "Southern", "Strange", "Supernatural", "Theoretical", "Third", "Total", 
    "Traditional", "Trailing", "Trembling", "Unknown", "Vacant", "Wandering", "Western", "Wild"
  ];

  string[] private prepositions = [
    "or",
    "from",
    "through",
    "with",
    "without",
    "beneath",
    "beyond",
    "before",
    "against",
    "amongst"
  ];

  string[] private formats = [
    "Softcover",
    "Oversized",
    "Mass-Market",
    "Hardcover",
    "Booklet"
  ];

  string[] private conditions = [
    "Fair",
    "Poor",
    "Perfect",
    "Fine",
    "Very Good",
    "Good"
  ];

  string[] private colors = [
    "#B08699",
    "#EBD999",
    "#FA2B00",
    "#0D75FF",
    "#66AB56",
    "#FFAB00",
    "#FFFFFF"
  ];

  uint256[] private formatWeights = [ 25, 38, 65, 85, 100 ];
  uint256[] private conditionWeights = [ 22, 36, 48, 63, 80, 100 ];
  uint256[] private colorWeights = [ 1, 2, 3, 4, 5, 6, 9 ];

  function random(uint256 tokenId, string memory seed) internal pure returns (uint256) {
    return uint256(keccak256(abi.encodePacked(seed, Strings.toString(tokenId))));
  }

  function getFormat(uint256 tokenId) public view returns (string memory) {
    return select(tokenId, "FORMAT", formats, formatWeights);
  }

  function getCondition(uint256 tokenId) public view returns (string memory) {
    return select(tokenId, "CONDITION", conditions, conditionWeights);
  }

  function getCoverColor(uint256 tokenId) public view returns (string memory) {
    return select(tokenId, "COLOR", colors, colorWeights);
  }

  function getSpineColor(uint256 tokenId) public view returns (string memory) {
    if ((random(tokenId, "SPINERARITY") % 15) < 3) {
      return select(tokenId, "SPINECOLOR", colors, colorWeights);
    } else {
      return select(tokenId, "COLOR", colors, colorWeights);
    }
  }

  function getPublisher(uint256 tokenId) public pure returns (uint256) {
    uint256 rand = random(tokenId, "PUBLISHER") % 100;
    return 15 > rand ? 1 : (51 > rand ? 2 : 3);
  }

  function getPages(uint256 tokenId) public pure returns (uint256) {
    return random(tokenId, "PAGES") % 501;
  }

  function getTitle(uint256 tokenId) public view returns (string memory) {
    uint256 rand = random(tokenId, "TITLE");
    uint256 format = rand % 4;
    string memory a1 = adjectives[(rand / 3) % adjectives.length];
    string memory n1 = nouns[(rand / 5) % nouns.length];
    string memory t1 = (rand / 7) % 2 != 0 ? 'The ' : '';
    string memory a2 = adjectives[(rand / 9) % adjectives.length];
    string memory n2 = nouns[(rand / 11) % nouns.length];
    string memory t2 = (rand / 13) % 2 != 0 ? 'the ' : '';
    string memory p = prepositions[(rand / 15) % prepositions.length];
    string memory j = (rand / 17) % 2 != 0 ? 'and' : 'of';

    if (format < 2) {
      return string(abi.encodePacked(
        (format == 1 ? t1 : ''), a1, ' ', n1
      ));
    } else {
      a1 = (rand / 26) % 2 != 0 ? string(abi.encodePacked(a1, ' ')) : '';
      a2 = (rand / 6) % 2 != 0 ? string(abi.encodePacked(a2, ' ')) : '';
      return string(abi.encodePacked(
        t1, a1, n1, ' ', (format == 2 ? p : j), ' ', t2, a2, n2
      ));
    }
  }

  function getTitleOutput(uint256 tokenId) internal view returns (string memory) {
    string memory output;
    bytes memory b = bytes(getTitle(tokenId));
    
    uint256 y = 78;
    uint256 i = 0;
    uint256 e = 0;    
    uint256 ll = 13;
    
    while (true) {
      e = i + ll;
      if (e >= b.length) {
        e = b.length;
      } else {
        while (b[e] != ' ' && e > i) { e--; }
      }

      bytes memory line = new bytes(e-i);
      for (uint k = i; k < e; k++) {
        line[k-i] = _upper(b[k]);
      }

      output = string(abi.encodePacked(output,'<text x="275" y="',Strings.toString(y),'">',line,'</text>'));
      if (y > 300) break;
      
      y += 38;
      if (e >= b.length) break;
      i = e + 1;
    }

    return output;
  }

  function getPublisherOutput(uint256 tokenId) internal pure returns (string memory) {
    uint256 publisher = getPublisher(tokenId);
    return publisher == 1 
      ? '<polygon points="50,430 60,450 40,450" />'
      : (publisher == 2 
      ? '<rect width="20" height="20" x="40" y="430" />' 
      : '<circle r="10" cx="50" cy="440" />');
  }

  function select(uint256 tokenId, string memory key, string[] memory sourceArray, uint256[] memory sourceWeights) internal pure returns (string memory) {
    uint256 val = random(tokenId, key) % sourceWeights[sourceWeights.length - 1];
    for(uint256 i = 0; i < sourceWeights.length; i++) {
      if (sourceWeights[i] > val) {
        return sourceArray[i];
      }
    } 
  }

  function tokenURI(uint256 tokenId) override public view returns (string memory) {
    string memory output = string(abi.encodePacked(
      '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 500"><rect width="500" height="500" />',
      '<rect width="450" height="450" x="25" y="25" rx="25" fill="', getCoverColor(tokenId), '" stroke="#000" />',
      '<rect width="50" height="450" x="25" y="25" fill="', getSpineColor(tokenId), '" stroke="#000" />',
      '<g font-family="serif" font-size="38px" text-anchor="middle">', getTitleOutput(tokenId),
      '<text x="275" y="450">', Strings.toString(tokenId), '</text></g>',
      '<text transform="rotate(90) translate(50 -45)" font-family="serif" font-size="16px">', getFormat(tokenId), ', ', Strings.toString(getPages(tokenId)), ', ', getCondition(tokenId), '</text>',
      getPublisherOutput(tokenId),
      '</svg>'
    ));

    string memory json = Base64.encode(bytes(string(abi.encodePacked('{"name": "Book #', Strings.toString(tokenId), '", "description": "Various Books is a collection of speculative books generated and stored on chain.", "image": "data:image/svg+xml;base64,', Base64.encode(bytes(output)), '"}'))));
    output = string(abi.encodePacked('data:application/json;base64,', json));

    return output;
  }

  function claim() public payable {
    require(saleIsActive, "Sale is not active");
    uint256 nextId = _tokenIdCounter.current();
    require(mintPrice <= msg.value, "Ether value sent is not correct");
    require(nextId <= 4500, "Token limit reached");
    _safeMint(_msgSender(), nextId);
    _tokenIdCounter.increment();
  }

  function ownerClaim(uint256 tokenId) public nonReentrant onlyOwner {
    require(tokenId > 4500 && tokenId <= 4600, "Token ID invalid");
    _safeMint(owner(), tokenId);
  }

  function flipSaleState() public onlyOwner {
    saleIsActive = !saleIsActive;
  }

  function withdraw(address to, uint256 amount) public nonReentrant onlyOwner {
    require(amount <= address(this).balance, "Amount too high");
    payable(to).transfer(amount);
  }

  function _upper(bytes1 _b1) private pure returns (bytes1) {
    if (_b1 >= 0x61 && _b1 <= 0x7A) {
      return bytes1(uint8(_b1) - 32);
    }
    return _b1;
  }

  constructor() ERC721("VariousBooks", "VAB") Ownable() {
    _tokenIdCounter.increment();
  }
}

/// [MIT License]
/// @title Base64
/// @notice Provides a function for encoding some bytes in base64
/// @author Brecht Devos <[email protected]>
library Base64 {
  bytes internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

  /// @notice Encodes some bytes to the base64 representation
  function encode(bytes memory data) internal pure returns (string memory) {
    uint256 len = data.length;
    if (len == 0) return "";

    // multiply by 4/3 rounded up
    uint256 encodedLen = 4 * ((len + 2) / 3);

    // Add some extra buffer at the end
    bytes memory result = new bytes(encodedLen + 32);

    bytes memory table = TABLE;

    assembly {
      let tablePtr := add(table, 1)
      let resultPtr := add(result, 32)

      for {
        let i := 0
      } lt(i, len) {

      } {
        i := add(i, 3)
        let input := and(mload(add(data, i)), 0xffffff)

        let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
        out := shl(8, out)
        out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))
        out := shl(8, out)
        out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))
        out := shl(8, out)
        out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))
        out := shl(224, out)

        mstore(resultPtr, out)

        resultPtr := add(resultPtr, 4)
      }

      switch mod(len, 3)
      case 1 {
        mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
      }
      case 2 {
        mstore(sub(resultPtr, 1), shl(248, 0x3d))
      }

      mstore(result, encodedLen)
    }

    return string(result);
  }
}

File 2 of 15 : 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 3 of 15 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT

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 make 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 4 of 15 : 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);
    }
}

File 5 of 15 : Counters.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 6 of 15 : 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 7 of 15 : 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 8 of 15 : 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 9 of 15 : 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 10 of 15 : 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 11 of 15 : 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 12 of 15 : 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 13 of 15 : 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 14 of 15 : 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 15 of 15 : 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);
}

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

Contract Security Audit

Contract ABI

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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.