Contract 0x222A11Ac067dA39B12BF221717BFAB75e3d374B4

 
Txn Hash
Method
Block
From
To
Value
0x02d1eba6e557f24726fde27acb96934010d71f0ec1c4122ee7c6ea579a4bd481Set Approval For...153612142022-08-17 21:59:582 days 2 hrs agoENS Name buglife.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00039084 8.37205195
0xdf4c54968ca8968036308bf209e4fecda2ccacf5e14df4d7b84687b276becea5Set Approval For...153111432022-08-10 0:18:4810 days 17 mins agoENS Name 0x681.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00066155 14.14521719
0x9af571e9f733d0aeb2a3791d5c5bfc5cc3f8ecc87576a027e1ddfd085f82e534Set Approval For...151854172022-07-21 10:38:5129 days 13 hrs ago0x061600d3515b387d562504eed5a1a485f9ae0ee4 IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00042256 17
0xfd42b6f141b24e89f9a099343250be7a57877f7677f44879e64574609206f50eSet Approval For...149642192022-06-14 22:35:3066 days 2 hrs agoENS Name notjustin.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00159003 34.05875811
0xc15003a0a583780ad5bc2956996b3b825827cf7b6645f41b65cdb2a74a3bb809Set Approval For...145562812022-04-10 6:17:02131 days 18 hrs agoENS Name krtklplz.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00076505 30.77809936
0x4173654b2ff26921040216e18248b799f4bc12b1d02220dda66e41a603beedebSet Approval For...145300572022-04-06 3:55:26135 days 20 hrs agoENS Name bradthe3rd.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00298164 63.75266194
0xc55078828639377f0bb0a1b9a4aed5f38bb72b2c9e98e3a83f417a231428583aSet Approval For...143035992022-03-01 21:40:12171 days 2 hrs agoENS Name goblindeeeznuts.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00235136 50.27617068
0x9d4cd7bf45a874a8b23e0aa5e6c0f13fd683d649ea80e4356db3b2dedff1fc9fSet Approval For...142920022022-02-28 2:44:25172 days 21 hrs ago0x068774358ebb17fbc8e1e51e35412422b4a6a814 IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00321887 68.82500407
0x528d6f2bf3c5f981b42ba3e5dfc25a09a6fccb6b5ee000139ae6360852b9d243Set Approval For...142425712022-02-20 11:07:08180 days 13 hrs agoENS Name pugson.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00115315 46.39172572
0x4b7c9aceec594afd3ab71819541da2de24c1ac5462ce43da722216b9db38c92fSet Approval For...142418252022-02-20 8:23:09180 days 16 hrs agoENS Name acsquared.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00147791 59.45670324
0xfd962fa40fb9a2bcf44806d39ab3454efc4d28ed9153fdadec80937e3e013eb3Set Approval For...142400972022-02-20 1:55:48180 days 22 hrs agoENS Name gprz.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00236178 95.01481877
0x2078262facda15f71671c8b0dcaceb0126ea13b9be735874f275a4188c471838Set Approval For...142399862022-02-20 1:31:35180 days 23 hrs agoENS Name setanimals.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00289706 116.54911413
0xf219dfd004f81f10c6fa925ec9feb07c8a72c8e224fbada6ad3a1bb576734c28Set Approval For...142207792022-02-17 1:54:46183 days 22 hrs agoENS Name drap3r.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00275756 110.93715694
0xc3f2b9647568f190e8ae0cc39b3c9fdaa4dc7f95f3f25d36d53d66931217735eSet Approval For...142207452022-02-17 1:47:06183 days 22 hrs agoENS Name drap3r.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00285694 61.08631307
0x68d5eaa0784e05c46d32a345018fd84b1d3754817d0267d5b77704ba1f069891Set Approval For...142144232022-02-16 2:10:29184 days 22 hrs ago0xaf7240360b32dc9c6558cc8e1be2546a180a8a2b IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00241871 51.71609735
0xb35bd4a4ab65594de962dd2e507d263c4cbcd7c4f6b6656f5c0c3a18a07cc91fSet Approval For...135289912021-11-01 4:08:31291 days 20 hrs agoENS Name jzs.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00715253 152.93317418
0xa1036009bacb6cfe01f737d82c5349db8b29bfa4a4b0c9af56a6d688b824d5bfSet Approval For...134426882021-10-18 15:48:27305 days 8 hrs agoENS Name bradthe3rd.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.005836 124.78371497
0x2032ce44add0ad91074276af41f7dd3053a55fc291a34f9b38afeeec50979808Transfer From134134672021-10-14 1:35:24309 days 23 hrs agoASCII Wall: Deployer IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00780407 88.86346288
0x64ae5f3e00a9035ad379089a79dfccdbf43fb5e30160b15da2d0cbf2ad6b2393Set Approval For...134012892021-10-12 3:25:42311 days 21 hrs agoENS Name jeffkraus.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00530291 113.38528896
0x2ca339df01f3cc4c195eb39c00d6b57c878e342c85beaf333822c8e90b1075ddTransfer From133953522021-10-11 5:06:48312 days 19 hrs agoASCII Wall: Deployer IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00951225 108.31410102
0x9e70850bbb7c1cdc24b4241b4f8e72d7c0e9ae7fa2991aaddccf594046e9a1b9Set Approval For...133721262021-10-07 13:40:30316 days 10 hrs agoENS Name mikeypesto.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00536407 114.69290236
0x63915269d2e9846ef47a591a7aa89b7f6b0065281e17661fd525965ef7c36715Set Approval For...133296752021-09-30 22:18:01323 days 2 hrs ago0xaf7240360b32dc9c6558cc8e1be2546a180a8a2b IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00402777 86.12056362
0x7684ac0e6b8b8420e7cd1b496788629a9bc67bb2b21796e3300e3a9e3f5918ffSet Approval For...132657552021-09-21 0:00:09333 days 35 mins agoENS Name pugson.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00660832 141.29709942
0xac3e672617505bede96c2241da346d38b595e3a063bf8a67dd9a00fb22b442b6Set Approval For...132358812021-09-16 9:09:34337 days 15 hrs agoENS Name sunar.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00222961 47.6728183
0x5704f5b43bd3e988f765edde794f9225cd21eddabf6ccea37d8f3a162a38fef6Set Approval For...132121852021-09-12 17:04:43341 days 7 hrs agoENS Name buglife.eth IN  0x222a11ac067da39b12bf221717bfab75e3d374b40 Ether0.00250649 53.59318229
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0x44661c8cbf9fd6c916bbb77be06176a544817691550971965e6f7ea80858a2f7131019672021-08-26 16:03:30358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xa5d5a755237f732d84a74605106552f4994af5bc1fe66490ad6626bbaa9ef817131019672021-08-26 16:03:30358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xd0b7779d35d37b5570530dead4defcdf80ae4cdef6004d493b8b4fa5990b98a8131019672021-08-26 16:03:30358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x596c9385acb80089d32162fa7d29bccfae435d8c129ac786d051a342e52e28fe131019672021-08-26 16:03:30358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x6407fde3c6d2ff57f7c6e2ec99ea0a92a5bce18e5492f66a39917ebcada00a11131019662021-08-26 16:03:04358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x3e69e5dfb1349ef1899c5770fb34e7d067ce67847e43eab9cb790773ac79fddb131019652021-08-26 16:02:55358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x45c68a7244d323fda632632f83c9b55a0366913c71e0f7862ec12b76475a25a0131019652021-08-26 16:02:55358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xda6c9cc41579134a1d66915b5eaa5b42b2c96f54d55c7b13f287c2e802b02425131019622021-08-26 16:01:53358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x283fede332b7454c9f1cbd26594e21532c83335640e603444bf8a70d56989969131019622021-08-26 16:01:53358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xbaeeb4e224eeb23a1c7f77aa55634c64512d2a0bf6e511209885477178e58e5c131019622021-08-26 16:01:53358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xacb8a80f5691b355b256e9ae4a485bcfe44e5586252041da84e8879f2c4009b5131019622021-08-26 16:01:53358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xf598f97fd9a25a05dfde331539801c6d87cc814c8d28b40440644a875c221136131019622021-08-26 16:01:53358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x9ebb32287f62fe3b1fca78ca8cc7496f0d824d7c21f3275e5e814dfea4a3a569131019612021-08-26 16:01:43358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xb778a692f8422f64f9da8bbd535c641370d352eed48012f0b6dc062794bb0ad4131019612021-08-26 16:01:43358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xc2c424bd6f56a5a9c324edad5d62b471e3a27f18c8516e27bd39ea592df6f645131019612021-08-26 16:01:43358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x740c34199f24966d9c099f940b4fca3d319934fe96ff8dbdafc293568c316b7a131019612021-08-26 16:01:43358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x151d5f7baadb824c044fff72a69dd59a2bf7805dfb85aba5972ed9d109d569bf131019602021-08-26 16:01:15358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xd8c1ce72ac1d3b426c80b96b1a1a484b2ddd3e881e142334077e5da0835ca1e7131019602021-08-26 16:01:15358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x94c13ad8ff15f75f9186512b9be2cec06fbb58b21b059082063aede6c59a1544131019602021-08-26 16:01:15358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x108cc9ba98f153e626b88b339ef711caf2d262263964b827d7136b7f4bda4cab131019602021-08-26 16:01:15358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xb19dc4a92acc892b1f7f485f9dbb2a5a4d2c40d3adb72a6f867270b1f6ab0acb131019602021-08-26 16:01:15358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x58f6f377b62f03d5e32f36e820a60ba287a1f00c9e3701a1772b6b1fe46ea94e131019592021-08-26 16:01:09358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0xc859b33d828ef8a0482714f9e479b4fc5137b96e7c3e9d3687745f612970022a131019572021-08-26 16:00:24358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x582c43467f66d1792c2279dbb3bde3578394ba43c5dadfb89c8de2017861ab90131019572021-08-26 16:00:24358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
0x946ebc9969f76627f153d9abc7be8fdba615dd656b32a50f64219480a48fa8fb131019572021-08-26 16:00:24358 days 8 hrs ago 0x222a11ac067da39b12bf221717bfab75e3d374b4Electronic Frontier Foundation0.025 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
Maze

Compiler Version
v0.8.6+commit.11564f7e

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 14 : Maze.sol
// contracts/Maze.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// BlockMazing

// The genesis maze https://blockmazing.com/m/0/maze.txt
// +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
// |   |   |   |   |               |                       |   |   |   |   |   |   |
// +   +   +   +   +---+---+---+   +---+---+---+---+---+   +   +   +   +   +   +   +
// |   |           |   |   |   |   |               |   |   |   |   |               |
// +   +---+---+   +   +   +   +   +---+---+---+   +   +   +   +   +---+---+---+   +
// |       |   |               |               |   |           |   |       |       |
// +---+   +   +---+---+---+   +---+---+---+   +   +---+---+   +   +---+   +---+   +
// |                                   |   |                   |       |           |
// +---+---+---+---+---+---+---+---+   +   +---+---+---+---+   +---+   +---+---+   +
// |   |       |   |   |       |   |   |           |       |   |       |   |       |
// +   +---+   +   +   +---+   +   +   +---+---+   +---+   +   +---+   +   +---+   +
// |                               |   |   |       |       |           |   |       |
// +---+---+---+---+---+---+---+   +   +   +---+   +---+   +---+---+   +   +---+   +
// |   |           |   |   |   |       |   |           |   |       |   |       |   |
// +   +---+---+   +   +   +   +---+   +   +---+---+   +   +---+   +   +---+   +   +
// |       |   |                   |   |   |       |   |           |   |   |       |
// +---+   +   +---+---+---+---+   +   +   +---+   +   +---+---+   +   +   +---+   +
// |   |               |   |   |       |       |   |   |   |   |       |   |       |
// +   +---+---+---+   +   +   +---+   +---+   +   +   +   +   +---+   +   +---+   +
// |   |   |   |   |           |   |   |                           |   |           |
// +   +   +   +   +---+---+   +   +   +---+---+---+---+---+---+   +   +---+---+   +
// |   |   |   |           |   |   |   |   |   |       |       |               |   |
// +   +   +   +---+---+   +   +   +   +   +   +---+   +---+   +---+---+---+   +   +
// |   |                   |           |   |   |       |           |   |       |   |
// +   +---+---+---+---+   +---+---+   +   +   +---+   +---+---+   +   +---+   +   +
// |       |   |   |                       |           |   |   |           |   |   |
// +---+   +   +   +---+---+---+---+---+   +---+---+   +   +   +---+---+   +   +   +
// |   |           |           |       |       |   |                   |   |       |
// +   +---+---+   +---+---+   +---+   +---+   +   +---+---+---+---+   +   +---+   +
// |   |   |                               |       |       |       |       |   |   |
// +   +   +---+---+---+---+---+---+---+   +---+   +---+   +---+   +---+   +   +   +
// |       |   |       |   |   |               |   |       |   |   |   |   |   |   |
// +---+   +   +---+   +   +   +---+---+---+   +   +---+   +   +   +   +   +   +   +
// |                   |           |           |                                   |
// +---+---+---+---+   +---+---+   +---+---+   +---+---+---+---+---+---+---+---+   +
// |                   |       |   |   |   |   |                   |           |   |
// +---+---+---+---+   +---+   +   +   +   +   +---+---+---+---+   +---+---+   +   +
// |   |   |           |   |               |   |           |       |   |           |
// +   +   +---+---+   +   +---+---+---+   +   +---+---+   +---+   +   +---+---+   +
// |                                                                               |
// +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+

// This is a basic project inspired by 0xd4e4078ca3495de5b1d4db434bebc5a986197782 (Autoglyphs) as well as Jamis Buck's Mazes for programmers. The goal is to have a unique maze represented on the blockchain.

// https://pragprog.com/titles/jbmaze/mazes-for-programmers/
// https://github.com/praetoriansentry/maze/
// https://blockmazing.com

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


contract Maze is ERC721, ERC721Enumerable, Ownable {
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;

    uint public constant MAZE_SIZE = 20;
    uint public constant MAX_TOKEN_COUNT = 256;
    uint constant FIELD_SIZE = MAZE_SIZE * MAZE_SIZE;
    uint256 public constant TOKEN_COST = 25000000000000000;

    // each maze will donate some money to EFF!
    address public constant EFF_ADDRESS = 0x095f1fD53A56C01c76A2a56B7273995Ce915d8C4;

    uint constant PRINTED_MAZE_COLS = (MAZE_SIZE * 4 + 2);
    uint constant PRINTED_MAZE_ROWS = (2 * MAZE_SIZE + 1);

    uint constant NORTH_WALL = 1;
    uint constant SOUTH_WALL = 2;
    uint constant EAST_WALL = 4;
    uint constant WEST_WALL = 8;
    uint constant VISITED = 16;

    bytes1 constant CHAR_PLUS = 0x2B;
    bytes1 constant CHAR_DASH = 0x2D;
    bytes1 constant CHAR_NEWLINE = 0x0A;
    bytes1 constant CHAR_PIPE = 0x7C;
    bytes1 constant CHAR_SPACE = 0x20;

    constructor() ERC721("BlockMazing", "MZE") {}

    function safeMint(address to) public payable {
        require(this.totalSupply() < MAX_TOKEN_COUNT, "The supply of mazes has been exhausted.");
        require(address(msg.sender).balance > TOKEN_COST, "Not enough ETH!");
        require(msg.value >= TOKEN_COST, "Value below price");
        address payable p = payable(EFF_ADDRESS);

        p.transfer(TOKEN_COST);
        _safeMint(to, _tokenIdCounter.current());
        _tokenIdCounter.increment();
    }

    function _baseURI() internal pure override returns (string memory) {
        return "https://blockmazing.com/m/";
    }

    function tokenDataURI(uint tokenId) public view returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        return string(abi.encodePacked("data:text/plain;charset=UTF-8,", draw(tokenId)));
    }

    function tokenURI(uint tokenId) public view override(ERC721) returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        string memory tokenIdString =  Strings.toString(tokenId);
        return string(abi.encodePacked(_baseURI(), tokenIdString, "/" , Strings.toString(tokenId), ".json"));
    }

    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);
    }

    // Take a token id and draw the maze that's unique to that token.
    function draw(uint id) public pure returns (string memory) {
        uint[FIELD_SIZE] memory bitfield = getMazeData(id);
        uint cell;
        uint cellIndex;
        uint row;
        uint col;

        bytes memory mazeOutput = new bytes(PRINTED_MAZE_COLS * PRINTED_MAZE_ROWS);
        // For each row
        for (uint i = 0; i < PRINTED_MAZE_ROWS; i++) {
            uint j = 0;
            while (j < PRINTED_MAZE_COLS) {
                uint idx = i * PRINTED_MAZE_COLS + j;
                // END OF THE ROW
                if (j + 1 == PRINTED_MAZE_COLS) {
                    mazeOutput[idx] = CHAR_NEWLINE;
                    j = j + 1;
                    continue;
                }

                // START OF THE ROW
                if (j == 0 && i % 2 == 1) {
                    mazeOutput[idx] = CHAR_PIPE;
                    j = j + 1;
                    continue;
                } else if (j == 0 && i % 2 == 0) {
                    mazeOutput[idx] = CHAR_PLUS;
                    j = j + 1;
                    continue;
                }


                if (i == 0) {
                    cell = 31;
                } else {
                    row = (i - 1) / 2;
                    col = j / 4;
                    cellIndex = rowColToBitIndex(row, col);
                    if (cellIndex < FIELD_SIZE && cellIndex >= 0) {
                        cell = bitfield[cellIndex];
                    } else {
                        cell = 31;
                    }
                }

                // What cell are we in?
                if (i % 2 == 1) {// EAST WEST
                    mazeOutput[idx++] = CHAR_SPACE;
                    mazeOutput[idx++] = CHAR_SPACE;
                    mazeOutput[idx++] = CHAR_SPACE;
                    if ((cell & EAST_WALL) == EAST_WALL) {
                        mazeOutput[idx++] = CHAR_PIPE;
                    } else {
                        mazeOutput[idx++] = CHAR_SPACE;
                    }
                    j = j + 4;
                } else {// NORTH SOUTH
                    if ((cell & SOUTH_WALL) == SOUTH_WALL) {
                        mazeOutput[idx++] = CHAR_DASH;
                        mazeOutput[idx++] = CHAR_DASH;
                        mazeOutput[idx++] = CHAR_DASH;
                    } else {
                        mazeOutput[idx++] = CHAR_SPACE;
                        mazeOutput[idx++] = CHAR_SPACE;
                        mazeOutput[idx++] = CHAR_SPACE;
                    }
                    mazeOutput[idx++] = CHAR_PLUS;
                    j = j + 4;
                }
            }
        }

        string memory finalMaze = string(mazeOutput);
        return finalMaze;
    }

    // Implementing the fastest and most trivial algorithm I could find.
    // https://weblog.jamisbuck.org/2011/2/1/maze-generation-binary-tree-algorithm
    function getMazeData(uint id) public pure returns (uint[FIELD_SIZE] memory) {
        uint[FIELD_SIZE] memory bitfield;
        uint cell;
        uint randInt = semiRandomData(id);
        bool goSouth;
        // Initialize a bit field
        for (uint i = 0; i < FIELD_SIZE; i = i + 1) {
            cell = 31;
            randInt = semiRandomData(randInt);
            // coin filt to decide if I should go south or east
            goSouth = (randInt % 1000) >= 500;
            uint[2] memory rowCol = bitIndexToRowCol(i);
            if (goSouth) {
                if (rowCol[0] < (MAZE_SIZE - 1)) {
                    cell = cell & ~SOUTH_WALL;
                } else if (rowCol[1] < (MAZE_SIZE -1)) {
                    cell = cell & ~EAST_WALL;
                }
            } else {
                if (rowCol[1] < (MAZE_SIZE - 1)) {
                    cell = cell & ~EAST_WALL;
                } else if (rowCol[0] < (MAZE_SIZE) - 1){
                    cell = cell & ~SOUTH_WALL;
                }
            }
            bitfield[i] = cell;
        }
        return bitfield;

    }

    // take an index that stored the flat array and return an array corresponding to the row and column in question
    function bitIndexToRowCol(uint idx) private pure returns (uint[2] memory) {
        uint row = idx / MAZE_SIZE;
        uint col = idx % MAZE_SIZE;
        return [row, col];
    }

    // Given a row and column, at the index in the flat array.
    function rowColToBitIndex(uint row, uint col) private pure returns(uint) {
        return row * MAZE_SIZE + col;
    }

    // copying the paramters from glibc for creating a sequence of pseudo-random numbers. The idea is that each tokenid will have it's own sequence and therefor have it's own maze.
    // https://en.wikipedia.org/wiki/Linear_congruential_generator#Parameters_in_common_use
    function semiRandomData(uint seed) public pure returns (uint) {
        return ((seed * 1103515245) + 12345) % 2147483648;
    }
}

File 2 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 3 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}. 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(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    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` 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 { }
}

File 4 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 5 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 6 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 7 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 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 : 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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 10 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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 11 of 14 : 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 or decremented by one. 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;
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant alphabet = "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] = alphabet[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

}

File 13 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 14 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);
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "berlin",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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:"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenDataURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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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.