Contract 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409 1

Txn Hash Method
Block
From
To
Value [Txn Fee]
0x7966e8c77b02da82c18345f121402e67353bc6b3fb020b2594dda998401aeb90Set Approval For...234729392021-11-29 11:57:3432 mins ago0x9c106370424c453ecb9b9cdd9c13530ba63ea1c9 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.006213553704
0x380972b961116d33a1d37f20db7033ceb3ad6e2e1e69b77de04442096e0b6a0cSet Approval For...234710512021-11-29 11:30:3759 mins ago0x4ec83037c8bf3596571d4c8551519f03767dbe47 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.009340763188
0xc3bcf8af287dd724367cab2bb87f6c1cf5e955dc6d861988f602dfdb71764807Set Approval For...234708992021-11-29 11:28:041 hr 1 min ago0xb17b60fdaacc67f70fa9597164943c55aafb3fd9 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.009769323826
0xbc4b5fe328017fd05a80bff56410b75e4245ffff09606eee5f25b8a8881531ccSet Approval For...234676902021-11-29 10:35:541 hr 54 mins ago0xdb7816f192dbbd9f5b709b9017f75ea3bb64cd3d IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.006699567659
0x70aee62827dbc769cabc888010e2dc501f96dafe0b0e5a58cb9e6c8e56ccd111Set Approval For...234579192021-11-29 8:12:214 hrs 17 mins ago0x7e9a6b14e78bf18bd483d208af423b96ab5075a4 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.008200541259
0x24b72c2a908c9540e37df5598316390c033c62e9b3a7d15cba9995bc17d66144Set Approval For...234572772021-11-29 8:04:024 hrs 26 mins ago0x06f667cd96735f1850799baa0917800e7d0beb39 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.009274239221
0x74ea098f9912958cf40011f6b788f1d3a957bb4eda4c6ada973113e6ce599acbSafe Transfer Fr...234462262021-11-29 5:10:557 hrs 19 mins ago0xb1c2ab40aeeae75ce81f242fa29492972d2d98ba IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.011289003211
0xc0519b126029d94d1dcce3e41652d5219c435bcd6979c03eac37cba4f3594b74Transfer From234228522021-11-28 23:34:5412 hrs 55 mins agoShiba Fantom: Deployer IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.017082865152
0xddecaf6c701ef9361266d0ca5b6634e182f49aeaa31945a7f08743281ff06a77Transfer From234228442021-11-28 23:34:4812 hrs 55 mins agoShiba Fantom: Deployer IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.017082865152
0xba3c4200a13edfdfe4bb3909acb3eb4d9e77b06b33689c99bab60572e0781d39Transfer From234228272021-11-28 23:34:3412 hrs 55 mins agoShiba Fantom: Deployer IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.017419911665
0x6bd24be8d83e34d4dd343a160c7b414af4a9cc33dacacbd3d270cd7921f1be7fTransfer From234228222021-11-28 23:34:3012 hrs 55 mins agoShiba Fantom: Deployer IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.018554725472
0xf9d65053fcc54ac6491e7a3d811c572367e764b0e55acc8b2a2f5407e1ec2240Transfer From234228012021-11-28 23:34:1512 hrs 55 mins agoShiba Fantom: Deployer IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.018679686052
0x910f8c0732b17dfe16c4051016fdf8a31be0177243ccb6e7aa564a79f671f808Transfer From234154982021-11-28 21:40:4614 hrs 49 mins ago0xe45f04bafa6eae1bf3ef7b534a8ec5ee0dc62b26 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.017763144458
0xafccb38317ec03de08a4eb6f4439efd4f70a37de514f16c8a937a2c854b53d47Transfer From234153352021-11-28 21:38:2514 hrs 51 mins ago0xe45f04bafa6eae1bf3ef7b534a8ec5ee0dc62b26 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.016655339523
0x7af4234bccdaf4d2ef416adcea30850dbde220cff404c028eca2d9639cfa5862Transfer From234102332021-11-28 20:24:5016 hrs 5 mins ago0xc1889adda0e4f31ba55a7ea909f9a93852e1b424 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.023484190664
0x6854f1910163f6b85432459ce591d8caee1391c08650f59eb1bee664178b992eTransfer From234021292021-11-28 18:19:1618 hrs 10 mins ago0xee82395f70353f272d277b40d063efc5d9a1f1d2 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.026727175839
0xfc9c07f7788c3f8e217466803445232824bd7103477f6d8e83b57e2f5b85ebeeSet Approval For...234011522021-11-28 18:05:1818 hrs 24 mins ago0x64d41fcf845ae252478f6a70fe9caed0e1742f8d IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.014884942934
0x755fde8b14b10168d6d10edbe0eb3236d7c4484df21e3412cfc653a9f6722eacSet Approval For...234011522021-11-28 18:05:1818 hrs 24 mins ago0x64d41fcf845ae252478f6a70fe9caed0e1742f8d IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.022074694262
0xc0a888e4e53c5bb31118313b35d1da1d25656ce990a3c247c25c8dd0a4b45a12Set Approval For...234005762021-11-28 17:53:3618 hrs 36 mins ago0x35214d8573bbc0a55245d625d155b55d76731f57 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.018773400933
0x685d0cf9f3c0d62f8f6897c9838c8e5b0c9733b043e94c9c9027417d7ac82c7fSet Paused233997592021-11-28 17:37:5218 hrs 52 mins ago0x9b7a6df4cc5d4125b1bfdc7ea80a45970368c116 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.008933404103
0x3a5e92dc916cd83a24580edaceb237e2143a8f2d50537350a9a23b22c8dffaeaMint233995992021-11-28 17:35:4218 hrs 54 mins ago0x896682aceb8ffd61b0fd91073362b25c93fe97fe IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.34370199174
0x79b09c1b64921c3e9391206eaf53506b0db203f5b339c014aaab6b2f012aa1abTransfer From233995362021-11-28 17:34:5218 hrs 55 mins ago0xc8f78497c72a2940ca5bc1795c79d48d42b246a4 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.021272182822
0x2d439863d83fb547ff2962a35c9907d266d5908f062930cfc97693f429ee796cMint233992142021-11-28 17:30:3318 hrs 59 mins ago0x9243fb3a9de9ca3148ab07a76fb0479ac68a1f74 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.584928408607
0x3eb3446c2fd557e3675fc8498630bc1cd83fad2710e58dc908eab5127f344dd6Mint233992082021-11-28 17:30:2818 hrs 59 mins ago0x0bc3fe1a54f52747f0a52083d4e4ec9b5698f3f0 IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.084194103969
0x67f5a84e6b3204bacac490b6870cab73bc9415c1988ed22a7fc9b6ac74e9e5caMint233990582021-11-28 17:28:2419 hrs 1 min ago0x41fcc28cba0245537b8833f4604674f38fc7f20e IN  0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090 FTM0.116381956259
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0x4629266cae2f2a14839942b9e572debb65d9a5c4e13d47eb43fff656dace6c48232882652021-11-27 14:08:291 day 22 hrs ago 0xd04f2119b174c14210e74e0ebb4a63a1b36ad4090x588dd1f57a93e555b7cd4358cb8442f5cac71ffc355,320 FTM
0x1005e25907c49dbfe2ceb8fa806cf9f6113cfe80972d5c35d6f8247d89ee3483231470782021-11-26 2:49:543 days 9 hrs ago 0xda6baae2b23bbd368243a25f7bab6446260d5184 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409324 FTM
0x43918aeca44a3ecf4363c20541246484aea021c3088b098133e3974c442de494231470552021-11-26 2:49:343 days 9 hrs ago 0x944a00cc8959a3131f39ce83e26a894418c1e4ed 0xd04f2119b174c14210e74e0ebb4a63a1b36ad40936 FTM
0x31ee1b00b47c16d72b70b13824059a39c85584e6ab43418d578c6756b8c6bbd1231470522021-11-26 2:49:323 days 9 hrs ago 0x1d5c7762b24d6926276dbfc272883a9fc0eca8f7 0xd04f2119b174c14210e74e0ebb4a63a1b36ad40936 FTM
0x62ee95a7d10ed3c7914e42a83af832dfb09f54b6cfb60ec16294b58bfe94f8d9231470502021-11-26 2:49:303 days 9 hrs ago 0xbe3ed777127627b2df3e8857f226cd0a22132194 0xd04f2119b174c14210e74e0ebb4a63a1b36ad40936 FTM
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0x6fdd796087eadfd206300ead5820ea2f9d8e4ac8cfba652ff769cca96ec87f84231470242021-11-26 2:49:063 days 9 hrs ago 0x3c58492ad9cad0d9f8570a80b6a1f02c0c1da2c5 0xd04f2119b174c14210e74e0ebb4a63a1b36ad40972 FTM
0x5f6b0adcb8f552df681b5ac69e03919f76f95ed4bc15114fbe74259233d5d860231470232021-11-26 2:49:053 days 9 hrs ago 0x51a6a4a1899e9999dbd0972927bea494e3921611 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409360 FTM
0x68c5b81c1ac6a569a897cca6fd8f8d563cdc45216ac0c2104733e9884c8feb09231470202021-11-26 2:49:033 days 9 hrs ago 0xe5418b07f7842002d9d13e9dbb4c70c7666d750f 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409360 FTM
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0xa8e7a7ecbdd52df682ca2d40af37dab069d09b06a0e4ca184a4c866e3d8b67e7231470172021-11-26 2:49:003 days 9 hrs ago 0x8a52ea93a45f4ac266e92bf641c45d1f2d79c915 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409360 FTM
0x0d9a5fd453cea94d173c14796bb92e6b12855ae5b8040a1c96674161a0c67b8d231470162021-11-26 2:48:593 days 9 hrs ago 0x2b5ad0341367ca7be5b03506b804f0d2780d1581 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409108 FTM
0x90ec57472819a11169b8fecb5b3331c96beeb059437434b0943584e8f8b87297231470152021-11-26 2:48:593 days 9 hrs ago 0xe5418b07f7842002d9d13e9dbb4c70c7666d750f 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409360 FTM
0x89350a55dd1e2dbd0f263cc9a3661d7f5430d94b52ccf1e8ea851828ea70c5f6231470142021-11-26 2:48:583 days 9 hrs ago 0x30123e49fe5f703b6675943c1520a422d1705db6 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409360 FTM
0x48c69784288dedd95ccd3a16cac109b8429f3de0ee6778c0df2d114956364614231470122021-11-26 2:48:533 days 9 hrs ago 0xccb500f042a25ea50d4076cee6f0d6c7fcd488d3 0xd04f2119b174c14210e74e0ebb4a63a1b36ad409360 FTM
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Contract Source Code Verified (Exact Match)

Contract Name:
Woolf

Compiler Version
v0.8.0+commit.c7dfd78e

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 21 : Woolf.sol
// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;
import "./Ownable.sol";
import "./Pausable.sol";
import "./ERC721Enumerable.sol";
import "./IWoolf.sol";
import "./IBarn.sol";
import "./ITraits.sol";
import "./WOOL.sol";

contract Woolf is IWoolf, ERC721Enumerable, Ownable, Pausable {
    // mint price
    uint256 public MINT_PRICE = 36 ether;
    // max number of tokens that can be minted - 50000 in production
    uint256 public immutable MAX_TOKENS;
    // number of tokens that can be claimed for free - 20% of MAX_TOKENS
    uint256 public PAID_TOKENS;
    // number of tokens have been minted so far
    uint16 public minted;

    address public feeWallet = 0x588dd1F57a93e555B7cD4358cb8442f5Cac71FfC;

    // mapping from tokenId to a struct containing the token's traits
    mapping(uint256 => SheepWolf) public tokenTraits;
    // mapping from hashed(tokenTrait) to the tokenId it's associated with
    // used to ensure there are no duplicates
    mapping(uint256 => uint256) public existingCombinations;

    // list of probabilities for each trait type
    // 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves
    uint8[][18] public rarities;
    // list of aliases for Walker's Alias algorithm
    // 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves
    uint8[][18] public aliases;

    // reference to the Barn for choosing random Wolf thieves
    IBarn public barn;
    // reference to $WOOL for burning on mint
    WOOL public wool;
    // reference to Traits
    ITraits public traits;

    /**
     * instantiates contract and rarity tables
     */
    constructor(
        address _wool,
        address _traits,
        uint256 _maxTokens
    ) ERC721("Wolf Game", "WGAME") {
        wool = WOOL(_wool);
        traits = ITraits(_traits);
        MAX_TOKENS = _maxTokens;
        PAID_TOKENS = _maxTokens / 5;

        // I know this looks weird but it saves users gas by making lookup O(1)
        // A.J. Walker's Alias Algorithm
        // sheep
        // fur
        rarities[0] = [15, 50, 200, 250, 255];
        aliases[0] = [4, 4, 4, 4, 4];
        // head
        rarities[1] = [
            190,
            215,
            240,
            100,
            110,
            135,
            160,
            185,
            80,
            210,
            235,
            240,
            80,
            80,
            100,
            100,
            100,
            245,
            250,
            255
        ];
        aliases[1] = [
            1,
            2,
            4,
            0,
            5,
            6,
            7,
            9,
            0,
            10,
            11,
            17,
            0,
            0,
            0,
            0,
            4,
            18,
            19,
            19
        ];
        // ears
        rarities[2] = [255, 30, 60, 60, 150, 156];
        aliases[2] = [0, 0, 0, 0, 0, 0];
        // eyes
        rarities[3] = [
            221,
            100,
            181,
            140,
            224,
            147,
            84,
            228,
            140,
            224,
            250,
            160,
            241,
            207,
            173,
            84,
            254,
            220,
            196,
            140,
            168,
            252,
            140,
            183,
            236,
            252,
            224,
            255
        ];
        aliases[3] = [
            1,
            2,
            5,
            0,
            1,
            7,
            1,
            10,
            5,
            10,
            11,
            12,
            13,
            14,
            16,
            11,
            17,
            23,
            13,
            14,
            17,
            23,
            23,
            24,
            27,
            27,
            27,
            27
        ];
        // nose
        rarities[4] = [175, 100, 40, 250, 115, 100, 185, 175, 180, 255];
        aliases[4] = [3, 0, 4, 6, 6, 7, 8, 8, 9, 9];
        // mouth
        rarities[5] = [
            80,
            225,
            227,
            228,
            112,
            240,
            64,
            160,
            167,
            217,
            171,
            64,
            240,
            126,
            80,
            255
        ];
        aliases[5] = [1, 2, 3, 8, 2, 8, 8, 9, 9, 10, 13, 10, 13, 15, 13, 15];
        // neck
        rarities[6] = [255];
        aliases[6] = [0];
        // feet
        rarities[7] = [
            243,
            189,
            133,
            133,
            57,
            95,
            152,
            135,
            133,
            57,
            222,
            168,
            57,
            57,
            38,
            114,
            114,
            114,
            255
        ];
        aliases[7] = [
            1,
            7,
            0,
            0,
            0,
            0,
            0,
            10,
            0,
            0,
            11,
            18,
            0,
            0,
            0,
            1,
            7,
            11,
            18
        ];
        // alphaIndex
        rarities[8] = [255];
        aliases[8] = [0];

        // wolves
        // fur
        rarities[9] = [210, 90, 9, 9, 9, 150, 9, 255, 9];
        aliases[9] = [5, 0, 0, 5, 5, 7, 5, 7, 5];
        // head
        rarities[10] = [255];
        aliases[10] = [0];
        // ears
        rarities[11] = [255];
        aliases[11] = [0];
        // eyes
        rarities[12] = [
            135,
            177,
            219,
            141,
            183,
            225,
            147,
            189,
            231,
            135,
            135,
            135,
            135,
            246,
            150,
            150,
            156,
            165,
            171,
            180,
            186,
            195,
            201,
            210,
            243,
            252,
            255
        ];
        aliases[12] = [
            1,
            2,
            3,
            4,
            5,
            6,
            7,
            8,
            13,
            3,
            6,
            14,
            15,
            16,
            16,
            17,
            18,
            19,
            20,
            21,
            22,
            23,
            24,
            25,
            26,
            26,
            26
        ];
        // nose
        rarities[13] = [255];
        aliases[13] = [0];
        // mouth
        rarities[14] = [
            239,
            244,
            249,
            234,
            234,
            234,
            234,
            234,
            234,
            234,
            130,
            255,
            247
        ];
        aliases[14] = [1, 2, 11, 0, 11, 11, 11, 11, 11, 11, 11, 11, 11];
        // neck
        rarities[15] = [
            75,
            180,
            165,
            120,
            60,
            150,
            105,
            195,
            45,
            225,
            75,
            45,
            195,
            120,
            255
        ];
        aliases[15] = [1, 9, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 14, 12, 14];
        // feet
        rarities[16] = [255];
        aliases[16] = [0];
        // alphaIndex
        rarities[17] = [8, 160, 73, 255];
        aliases[17] = [2, 3, 3, 3];
    }

    /** EXTERNAL */

    /**
     * mint a token - 90% Sheep, 10% Wolves
     * The first 20% are free to claim, the remaining cost $WOOL
     */
    function mint(uint256 amount, bool stake) external payable whenNotPaused {
        require(tx.origin == _msgSender(), "Only EOA");
        require(minted + amount <= MAX_TOKENS, "All tokens minted");
        require(amount > 0 && amount <= 10, "Invalid mint amount");
        if (minted < PAID_TOKENS) {
            require(
                minted + amount <= PAID_TOKENS,
                "All tokens on-sale already sold"
            );
            require(amount * MINT_PRICE == msg.value, "Invalid payment amount");
        } else {
            require(msg.value == 0);
        }

        uint256 totalWoolCost = 0;
        uint16[] memory tokenIds = stake
            ? new uint16[](amount)
            : new uint16[](0);
        uint256 seed;
        for (uint256 i = 0; i < amount; i++) {
            minted++;
            seed = random(minted + block.timestamp);
            generate(minted, seed);
            address recipient = selectRecipient(seed);
            if (!stake || recipient != _msgSender()) {
                _safeMint(recipient, minted);
            } else {
                _safeMint(address(barn), minted);
                tokenIds[i] = minted;
            }
            totalWoolCost += mintCost(minted);
        }

        if (totalWoolCost > 0) wool.burn(_msgSender(), totalWoolCost);
        if (stake) barn.addManyToBarnAndPack(_msgSender(), tokenIds);
    }

    /**
     * the first 20% are paid in ETH
     * the next 20% are 20000 $WOOL
     * the next 40% are 40000 $WOOL
     * the final 20% are 80000 $WOOL
     * @param tokenId the ID to check the cost of to mint
     * @return the cost of the given token ID
     */
    function mintCost(uint256 tokenId) public view returns (uint256) {
        if (tokenId <= PAID_TOKENS) return 0;
        if (tokenId <= (MAX_TOKENS * 2) / 5) return 20000 ether;
        if (tokenId <= (MAX_TOKENS * 4) / 5) return 40000 ether;
        return 80000 ether;
    }

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        // Hardcode the Barn's approval so that users don't have to waste gas approving
        if (_msgSender() != address(barn))
            require(
                _isApprovedOrOwner(_msgSender(), tokenId),
                "ERC721: transfer caller is not owner nor approved"
            );
        _transfer(from, to, tokenId);
    }

    /** INTERNAL */

    /**
     * generates traits for a specific token, checking to make sure it's unique
     * @param tokenId the id of the token to generate traits for
     * @param seed a pseudorandom 256 bit number to derive traits from
     * @return t - a struct of traits for the given token ID
     */
    function generate(uint256 tokenId, uint256 seed)
        internal
        returns (SheepWolf memory t)
    {
        t = selectTraits(seed);
        if (existingCombinations[structToHash(t)] == 0) {
            tokenTraits[tokenId] = t;
            existingCombinations[structToHash(t)] = tokenId;
            return t;
        }
        return generate(tokenId, random(seed));
    }

    /**
     * uses A.J. Walker's Alias algorithm for O(1) rarity table lookup
     * ensuring O(1) instead of O(n) reduces mint cost by more than 50%
     * probability & alias tables are generated off-chain beforehand
     * @param seed portion of the 256 bit seed to remove trait correlation
     * @param traitType the trait type to select a trait for
     * @return the ID of the randomly selected trait
     */
    function selectTrait(uint16 seed, uint8 traitType)
        internal
        view
        returns (uint8)
    {
        uint8 trait = uint8(seed) % uint8(rarities[traitType].length);
        if (seed >> 8 < rarities[traitType][trait]) return trait;
        return aliases[traitType][trait];
    }

    /**
     * the first 20% (ETH purchases) go to the minter
     * the remaining 80% have a 10% chance to be given to a random staked wolf
     * @param seed a random value to select a recipient from
     * @return the address of the recipient (either the minter or the Wolf thief's owner)
     */
    function selectRecipient(uint256 seed) internal view returns (address) {
        if (minted <= PAID_TOKENS || ((seed >> 245) % 10) != 0)
            return _msgSender(); // top 10 bits haven't been used
        address thief = barn.randomWolfOwner(seed >> 144); // 144 bits reserved for trait selection
        if (thief == address(0x0)) return _msgSender();
        return thief;
    }

    /**
     * selects the species and all of its traits based on the seed value
     * @param seed a pseudorandom 256 bit number to derive traits from
     * @return t -  a struct of randomly selected traits
     */
    function selectTraits(uint256 seed)
        internal
        view
        returns (SheepWolf memory t)
    {
        t.isSheep = (seed & 0xFFFF) % 10 != 0;
        uint8 shift = t.isSheep ? 0 : 9;
        seed >>= 16;
        t.fur = selectTrait(uint16(seed & 0xFFFF), 0 + shift);
        seed >>= 16;
        t.head = selectTrait(uint16(seed & 0xFFFF), 1 + shift);
        seed >>= 16;
        t.ears = selectTrait(uint16(seed & 0xFFFF), 2 + shift);
        seed >>= 16;
        t.eyes = selectTrait(uint16(seed & 0xFFFF), 3 + shift);
        seed >>= 16;
        t.nose = selectTrait(uint16(seed & 0xFFFF), 4 + shift);
        seed >>= 16;
        t.mouth = selectTrait(uint16(seed & 0xFFFF), 5 + shift);
        seed >>= 16;
        t.neck = selectTrait(uint16(seed & 0xFFFF), 6 + shift);
        seed >>= 16;
        t.feet = selectTrait(uint16(seed & 0xFFFF), 7 + shift);
        seed >>= 16;
        t.alphaIndex = selectTrait(uint16(seed & 0xFFFF), 8 + shift);
    }

    /**
     * converts a struct to a 256 bit hash to check for uniqueness
     * @param s the struct to pack into a hash
     * @return the 256 bit hash of the struct
     */
    function structToHash(SheepWolf memory s) internal pure returns (uint256) {
        return
            uint256(
                keccak256(
                    abi.encodePacked(
                        s.isSheep,
                        s.fur,
                        s.head,
                        s.eyes,
                        s.mouth,
                        s.neck,
                        s.ears,
                        s.feet,
                        s.alphaIndex
                    )
                )
            );
    }

    /**
     * generates a pseudorandom number
     * @param seed a value ensure different outcomes for different sources in the same block
     * @return a pseudorandom value
     */
    function random(uint256 seed) internal view returns (uint256) {
        return
            uint256(
                keccak256(
                    abi.encodePacked(
                        tx.origin,
                        blockhash(block.number - 1),
                        block.timestamp,
                        seed
                    )
                )
            );
    }

    /** READ */

    function getTokenTraits(uint256 tokenId)
        external
        view
        override
        returns (SheepWolf memory)
    {
        return tokenTraits[tokenId];
    }

    function getPaidTokens() external view override returns (uint256) {
        return PAID_TOKENS;
    }

    /** ADMIN */

    /**
     * called after deployment so that the contract can get random wolf thieves
     * @param _barn the address of the Barn
     */
    function setBarn(address _barn) external onlyOwner {
        barn = IBarn(_barn);
    }

    /**
     * allows owner to withdraw funds from minting
     */
    function withdraw() external onlyOwner {
        payable(feeWallet).transfer(address(this).balance);
    }

    function setFeeWallet(address _feeWallet) external onlyOwner {
      feeWallet = _feeWallet;
    }

    /**
     * updates the number of tokens for sale
     */
    function setPaidTokens(uint256 _paidTokens) external onlyOwner {
        PAID_TOKENS = _paidTokens;
    }

    /**
     * enables owner to pause / unpause minting
     */
    function setPaused(bool _paused) external onlyOwner {
        if (_paused) _pause();
        else _unpause();
    }

    /** RENDER */

    function setMintPrice(uint256 _price) external onlyOwner {
        MINT_PRICE = _price;
    }

    function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );
        return traits.tokenURI(tokenId);
    }
}

File 2 of 21 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./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 3 of 21 : Pausable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

File 4 of 21 : 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 5 of 21 : IWoolf.sol
// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;

interface IWoolf {

  // struct to store each token's traits
  struct SheepWolf {
    bool isSheep;
    uint8 fur;
    uint8 head;
    uint8 ears;
    uint8 eyes;
    uint8 nose;
    uint8 mouth;
    uint8 neck;
    uint8 feet;
    uint8 alphaIndex;
  }


  function getPaidTokens() external view returns (uint256);
  function getTokenTraits(uint256 tokenId) external view returns (SheepWolf memory);
}

File 6 of 21 : IBarn.sol
// SPDX-License-Identifier: MIT LICENSE 

pragma solidity ^0.8.0;

interface IBarn {
  function addManyToBarnAndPack(address account, uint16[] calldata tokenIds) external;
  function randomWolfOwner(uint256 seed) external view returns (address);
}

File 7 of 21 : ITraits.sol
// SPDX-License-Identifier: MIT LICENSE 

pragma solidity ^0.8.0;

interface ITraits {
  function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 8 of 21 : WOOL.sol
// SPDX-License-Identifier: MIT LICENSE

pragma solidity ^0.8.0;
import "./ERC20.sol";
import "./Ownable.sol";

contract WOOL is ERC20, Ownable {

  // a mapping from an address to whether or not it can mint / burn
  mapping(address => bool) controllers;
  
  constructor() ERC20("WOOL", "WOOL") { }

  /**
   * mints $WOOL to a recipient
   * @param to the recipient of the $WOOL
   * @param amount the amount of $WOOL to mint
   */
  function mint(address to, uint256 amount) external {
    require(controllers[msg.sender], "Only controllers can mint");
    _mint(to, amount);
  }

  /**
   * burns $WOOL from a holder
   * @param from the holder of the $WOOL
   * @param amount the amount of $WOOL to burn
   */
  function burn(address from, uint256 amount) external {
    require(controllers[msg.sender], "Only controllers can burn");
    _burn(from, amount);
  }

  /**
   * enables an address to mint / burn
   * @param controller the address to enable
   */
  function addController(address controller) external onlyOwner {
    controllers[controller] = true;
  }

  /**
   * disables an address from minting / burning
   * @param controller the address to disbale
   */
  function removeController(address controller) external onlyOwner {
    controllers[controller] = false;
  }
}

File 9 of 21 : 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 10 of 21 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Context.sol";
import "./Strings.sol";
import "./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 11 of 21 : 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 12 of 21 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

File 13 of 21 : 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 14 of 21 : 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 15 of 21 : 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 16 of 21 : 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 17 of 21 : 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 18 of 21 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

File 19 of 21 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./IERC20Metadata.sol";
import "./Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens 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 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 20 of 21 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 21 of 21 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

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

Contract Security Audit

Contract ABI

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

0000000000000000000000002e4bf93bded3236d0719aa3ceb43932f279efe1f000000000000000000000000773e7ca9c70707313cc7b09ab8e38a44fd8aae10000000000000000000000000000000000000000000000000000000000000c350

-----Decoded View---------------
Arg [0] : _wool (address): 0x2e4bf93bded3236d0719aa3ceb43932f279efe1f
Arg [1] : _traits (address): 0x773e7ca9c70707313cc7b09ab8e38a44fd8aae10
Arg [2] : _maxTokens (uint256): 50000

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000002e4bf93bded3236d0719aa3ceb43932f279efe1f
Arg [1] : 000000000000000000000000773e7ca9c70707313cc7b09ab8e38a44fd8aae10
Arg [2] : 000000000000000000000000000000000000000000000000000000000000c350


Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Validator ID :
0 FTM

Amount Staked
0

Amount Delegated
0

Staking Total
0

Staking Start Epoch
0

Staking Start Time
0

Proof of Importance
0

Origination Score
0

Validation Score
0

Active
0

Online
0

Downtime
0 s
Address Amount claimed Rewards Created On Epoch Created On
Block Uncle Number Difficulty Gas Used Reward
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