Contract 0xCa7cA7BcC765F77339bE2d648BA53ce9c8a262bD 6

 
Txn Hash
Method
Block
From
To
Value
0x60e710005b468107c031ef257acdc7b2f14125dd75c076c81e76a94089aa914bSet Approval For...156584412022-10-02 5:42:591 hr 28 mins ago0x5ba89cad1b7925083fdc91f8afc5dff954df803f IN  tubby cats: TUBBY Token0 Ether0.00012448 5.00789992
0x86d9b69f526bfbddb94181c1d5890834d3c204fbac46efa7bce9ffbea078beadSet Approval For...156559802022-10-01 21:28:239 hrs 42 mins ago0x1c05a8ad43b2b48f6c04afa97f634d133053e05e IN  tubby cats: TUBBY Token0 Ether0.00040487 8.67240648
0xde323962e01f4b63890ea7911eacd5bdfdfdccf127519212ed6c3bf92d64dc1eSet Approval For...156534302022-10-01 12:51:5918 hrs 19 mins ago0x98967304dcbec4807305a5b1f68d9226e8643d9e IN  tubby cats: TUBBY Token0 Ether0.0003389 7.25936291
0x68c09db1317b5327fea6f3f925b03278f4113ca36dffa0e40c6d221bcdc904f1Set Approval For...156526902022-10-01 10:23:2320 hrs 47 mins agoENS Name kardon.eth IN  tubby cats: TUBBY Token0 Ether0.0001979 4.23907212
0x1c630779d1c8ff59294fe44514eca1881061b5fd3e74a85a3f173d292334c4b1Set Approval For...156525132022-10-01 9:47:4721 hrs 23 mins ago0x7a43439a162a8abefa462b631b414bfe5d4b98db IN  tubby cats: TUBBY Token0 Ether0.00029215 6.25794086
0x74fed970ee387a579b3281f2145e1e7e636eb452cb5284472c96b53a32f385e4Set Approval For...156515152022-10-01 6:27:471 day 43 mins ago0xc58537a9c71e7202c79c9abfeeaf4ee0c48f1be8 IN  tubby cats: TUBBY Token0 Ether0.00035387 7.58005996
0x9c156b97d1bf2413b3e1521cfe28662e0cfe75776c665835ffa4966b5dd0ebc1Set Approval For...156500012022-10-01 1:21:591 day 5 hrs ago0xb3d264380ffcf9e764a16ee9addd08bdcf46093f IN  tubby cats: TUBBY Token0 Ether0.00043472 9.31195557
0xd4267b7d9362a42b8337f4077c436ed5ec3bf567db144b511c030f873b78f7b2Set Approval For...156495762022-09-30 23:56:231 day 7 hrs ago0x6a68b15a9eb12bb3951b5ebf2c321d4968aaac51 IN  tubby cats: TUBBY Token0 Ether0.00033898 7.26119472
0x4f408c90137914f653f3e6348b90698ab31beb6ab690c2d7201defab4c080be0Set Approval For...156488712022-09-30 21:34:351 day 9 hrs agoENS Name gitchy.eth IN  tubby cats: TUBBY Token0 Ether0.00057006 12.2108621
0xc5375679294ebc14f130f434944e02926462a4cd3d6d3ce3709628278dd94aebSet Approval For...156486762022-09-30 20:55:351 day 10 hrs ago0xb4705fd75ac926ff84a2467eb39a0be12892641f IN  tubby cats: TUBBY Token0 Ether0.00079546 17.03907316
0x5fc13df7a8ddda1c10b1e29e15d7e21024177808357718f64c2e697e1fd1bd9cSet Approval For...156486702022-09-30 20:54:231 day 10 hrs ago0xaffd2f666bc699541adae6b8b4dd3b5b33b9efb8 IN  tubby cats: TUBBY Token0 Ether0.00073333 15.70805409
0x55333eff6374fb9bb8265ed55cfb155679bd7c635af17edb8aac279eb5c33751Set Approval For...156480762022-09-30 18:55:111 day 12 hrs ago0x848a9126ff57004aa8bfdc99384f36a4754d4367 IN  tubby cats: TUBBY Token0 Ether0.00069046 14.78996383
0x34be96396edee26fd4f860991c6b88303bac07ac492249040cea81919f91daacSet Approval For...156471562022-09-30 15:50:111 day 15 hrs agoENS Name mahoneyjr.eth IN  tubby cats: TUBBY Token0 Ether0.00196575 42.03118666
0x9f9ef7847fbbdf0960c0043f45c40a5e9e085920f7b1484531e35860168a7ee2Set Approval For...156471562022-09-30 15:50:111 day 15 hrs agoENS Name mahoneyjr.eth IN  tubby cats: TUBBY Token0 Ether0.00196222 42.03118666
0x6636f32f31d2e660bab5b222dfdbcf76b8db6db8b1bc2f58dfe9ba4d255fe7e7Set Approval For...156450702022-09-30 8:51:111 day 22 hrs ago0x4b4f2c82dded91191d19e8fa07315f5f2b62abb8 IN  tubby cats: TUBBY Token0 Ether0.00056176 12.01157425
0xf09410fa82c714a19f9fc59964fd33cd26eca5a72583f64509c7f1dd557f16aeSet Approval For...156422382022-09-29 23:21:112 days 7 hrs ago0xf405eb2e1f2fb4734b41a262b1d535b57bc01635 IN  tubby cats: TUBBY Token0 Ether0.0004788 10.25607934
0xbe573ce651a2fbb652a1cb763a36e7d68b44ddb8640679090c005e7f523f7be5Set Approval For...156422082022-09-29 23:15:112 days 7 hrs ago0xd893c8fb50b4c502b8a674c9695f5a2e241135b1 IN  tubby cats: TUBBY Token0 Ether0.00049084 10.51395991
0x0420b55541e4089f050db4d54e67946af66b0bcbe28443f8bbe0bd9736f0f47fSet Approval For...156414432022-09-29 20:40:352 days 10 hrs ago0x496229dcbf458cc76b7d4e40e6465de48ffd9d59 IN  tubby cats: TUBBY Token0 Ether0.00058977 12.63311465
0xfa937debbd4cfc35f38d4599465235e962a64949584668a6dd1ef8bae5b113c9Set Approval For...156412092022-09-29 19:53:232 days 11 hrs ago0xc36beec491d32604f767b89fcff7e0de75b853cd IN  tubby cats: TUBBY Token0 Ether0.0007041 15.08196058
0xa6b20a696bb29f881426e1c967fdf45c99e3b7dd0c02f610521c4d4972aae229Set Approval For...156411622022-09-29 19:43:592 days 11 hrs ago0xe005e32c05573eb31b347cf386f65577e9f9f888 IN  tubby cats: TUBBY Token0 Ether0.00079043 16.93123043
0xc2ca622f70b4a2c779b7f20da077ceab425c2866e17a6f8ac75c98d1894def57Set Approval For...156410662022-09-29 19:24:352 days 11 hrs ago0xb2c3610165de50e1162719ddff3d35c7708aa16b IN  tubby cats: TUBBY Token0 Ether0.00072719 15.57655385
0xd1bbedaaff5ba7e5220b0418a8e691f79ae4ee08274bcadae78928a530983027Set Approval For...156409692022-09-29 19:05:112 days 12 hrs agoENS Name davidrockwell.eth IN  tubby cats: TUBBY Token0 Ether0.00041976 16.94441175
0x549053ff5b034d3a34b28da4bdfdb1c6659eb602089a9bfcdf56144a428e168bSet Approval For...156409612022-09-29 19:03:352 days 12 hrs agoENS Name davidrockwell.eth IN  tubby cats: TUBBY Token0 Ether0.00036514 14.6897217
0xd48cf1afab1e6753a944a0800d2b4967bc6792f80333ea1f76f829a86f10a2d6Set Approval For...156409602022-09-29 19:03:232 days 12 hrs agoENS Name davidrockwell.eth IN  tubby cats: TUBBY Token0 Ether0.00040146 16.15098304
0x5ba2d85f60a35cecc28dbfc129affd59876e4a8eb24c93f0b5416945436fe14eSet Approval For...156409592022-09-29 19:03:112 days 12 hrs agoENS Name davidrockwell.eth IN  tubby cats: TUBBY Token0 Ether0.00039302 15.81139685
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OVERVIEW

tubby cats by @tubbyCollective

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x0c3d6fe813b001e21c6167fc088d92766a5294a04465f508f56b0d76a12d63f9142638132022-02-23 18:01:52220 days 13 hrs ago tubby cats: TUBBY Tokentubby cats: Deployer637 Ether
0xbd5c2310d99466b7e02519d5cddcd0f622441974f72fe6b94e7757e39dba2178142635812022-02-23 17:09:15220 days 14 hrs ago 0xc0fc99f5a0e983de1c5ec1a478cb603e007ad8d6 tubby cats: TUBBY Token0.5 Ether
0x99978492b37ea2477b576dcccb14b08f064732d72b6abddfd3c57e1c02d05f06142635272022-02-23 16:51:51220 days 14 hrs ago 0x5184c889f28a5c3c7848e9eec93680aae56a8c76 tubby cats: TUBBY Token0.5 Ether
0x22d9a7c85a9f936aa24afa611067186422f63670637f38a365604af7f49e98f5142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x8f0289aa161be79fda91b75ec482fe0510d7c1e86426791eb67f6b353b7c7593142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x592e58d007adaf0943d3b1593169a35b2deed382805d9f4a119ff932b403a6e9142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0xc039674a7d075b6ceb7250bb68456456c79a87e9ade79164e0df1b40f5c01081142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0xdb1610f3e1049e8635397ff7acebe26e1d93f44b07c592e96d455a02c7a947a1142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x879466a0c31afb143ea40ae785b8a1647f38432c3d78ac9ffffd2583f5454aad142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x90984185533592d499536e17415c6b8e2ce5d55a4669a25d8e9e20740e474ef5142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0xe28df59500e32205438fdb68523527d72a6f33cc6508b413612ac0f8797a8734142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x7ec862d75f03b2f9e101f371126d5f86bbb775ba0097404cee15f4650cbf4ca6142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x437fb35dfd170fece9699dd64d3845e24da53723ebe40d4e39b393eed8a29d9f142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x8294f6be1b6ce05d8f6dcf26554acc0bb93f93a2780b0d2302f5654cfc46efb3142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x0353bf9f4dda823a5e02ed97c7e9208a9b877762ebe515005a851bcfd7f2295e142635122022-02-23 16:47:24220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x87cb809b27c40c3e3d355778232a0014d9b9f6ef03215b98387ed0b1b08d262c142635112022-02-23 16:47:18220 days 14 hrs ago 0x0e64de68d8c2aaf45512bdb756e19fe6e6ea8cb9 tubby cats: TUBBY Token0.5 Ether
0x9568c574f336490a3d3272c124269c6652ec922405f29eeedb23d559f7782895142635102022-02-23 16:47:14220 days 14 hrs ago 0x6f5158c136e37f8ac7d0a34ef8921e762c278150 tubby cats: TUBBY Token0.5 Ether
0xa8a55d44d29b40e1bf3be0b58c6fcb7eae5cb4e2497c24ba275bc5b5acf8550f142635092022-02-23 16:47:10220 days 14 hrs ago 0x5184c889f28a5c3c7848e9eec93680aae56a8c76 tubby cats: TUBBY Token0.5 Ether
0x333f19588f788eb9316f7de486f57e6b81839f0c7311aba76a5f1aa505fa3448142635092022-02-23 16:47:10220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x336f5c6f125d912173c76f9742c2e7e925e5bf7aebed98691bd65af4c37254ed142635092022-02-23 16:47:10220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x2c94698541938f3e6e22a27cf3837a971d75833c88c1c885e55ea51789920706142635092022-02-23 16:47:10220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x7842cf61246a05255c683b99d5a23e3fc30cf22e310ca51b21726e640f319dc1142635092022-02-23 16:47:10220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x289b76596ecee2c420dd31c41f72f3a1b4d068bc22ed062679cfaa6d8aba2b84142635092022-02-23 16:47:10220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x59f5c05c13c99f283b66f9f546fa821bf85cb54479514b7e57ea54752ec602c4142635092022-02-23 16:47:10220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
0x4df8adf7a323341293a56f7356d8c88659a5fcd4b50edfe0566895a2639ac415142635092022-02-23 16:47:10220 days 14 hrs ago 0x4ff5b422cc418595ecf3094c6b818615ed18e756 tubby cats: TUBBY Token0.5 Ether
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Loading

Contract Source Code Verified (Exact Match)

Contract Name:
Tubbies

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 19 : Tubbies.sol
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./MultisigOwnable.sol";
import "@chainlink/contracts/src/v0.8/VRFConsumerBase.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "./ERC721A.sol";
import "./BatchReveal.sol";

/*
:::::::::::::::::::::::::::::ヽヽヽヽ:::::::::::::::::::::::::::::::::::::::::::::::::::::::
::::::::::::::::☆:::::::.:::::::::ヽヽヽヽヽ:::::::::::::::::::::::::::::::::::::::::::::::::
::::::::::::::::::::::,'  ヽ.::::::::ヽヽヽ::::::::,.::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::。::/       ヽ:::::::::ヽヽ ::: /   ヽ:::::::☆:::::::::::::☆::::::::☆::::::
::::::::::::::::::/           ヽ:::::::::☆::/         ヽ::::::::::::::::::::::::::::::::::::
::::::::::::::::;'              `--ーーーーー-く .         ',:::::::::::::::::::::::::::::::::
:::::::::☆:::::/                                       ',:::::::::::::::::::::::::::::::::
::::::::::::::/                                          ,:::::::::::::::::。:::::::::::::
:::::::::::::/                                            ,::::::::::::::。::::::::::::::::
::::::::::::;'                                            ::::::。:::::::::::::::::::::::::
:::。:::::: /                    , ______             j::::::::::::::。::::::::::::::::
:::::::::: j               ' ´                   ` ヽ.      ,:::::::::::。::::::::::::::::::
::::::::::!              ´                           ヽ      ,:::::::::☆:::::::::::::::::::
::::::::: !             ´      _                _   ヽ     !::::::::::::::::::::::::::::::
::::::::: !            |  γ  =(   ヽ         : ' =::( ヽ|     !:::::::::::::::::::::::::::::
::::::::: !            | 〈 ん:::☆:j j       ! ん:☆:::ハ       ::::::::::::::::::::::::::::::
::::::::: !            |  弋:::::.ノ ノ        ヾ:::::ノ ノ |     ::::::::::::::::::::::::::::::
:::::::::::'           |    ゝ  -  '     人    -    '  ノ     j::::::::::::::::::::::::::::::
:::::::::::,            ヽ                            ,     j::::☆::::::::::::::::::::::::::
::::::::::::,            ' 、                      , /     ノ::::::::::::::::::::::::::::::::
::::::::::::::\             ー--------------- '         ,':::::::::::::::::::::::::::::::::
::::☆:::::::::::ヽ                                    /:::::::::::::::::::::::::::::::::::
:::::::::::::::::::7                :::::::::::::::<::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::r´                   :::::::::::::ヽ::::::::::::::::::::::::::::::::::::
::::::::::::::::::/                               :::::ヽ::::::::::::::::::::::::::::::::::
*/

// IMPORTANT: _burn() must never be called
contract Tubbies is ERC721A, MultisigOwnable, VRFConsumerBase, BatchReveal {
    using Strings for uint256;

    bytes32 immutable public merkleRoot;
    uint immutable public startSaleTimestamp;
    string public baseURI;
    string public unrevealedURI;
    bool public finalized = false;
    bool public useFancyMath = true;
    bool public airdropped = false;

    // Constants from https://docs.chain.link/docs/vrf-contracts/
    bytes32 immutable private s_keyHash;
    address immutable private linkToken;
    address immutable private linkCoordinator;

    constructor(bytes32 _merkleRoot, string memory _baseURI, string memory _unrevealedURI, bytes32 _s_keyHash, address _linkToken, address _linkCoordinator)
        ERC721A("Tubby Cats", "TUBBY")
        VRFConsumerBase(_linkCoordinator, _linkToken)
    {
        linkToken = _linkToken;
        linkCoordinator = _linkCoordinator;
        s_keyHash = _s_keyHash;
        merkleRoot = _merkleRoot;
        startSaleTimestamp = block.timestamp + 2 days;
        unrevealedURI = _unrevealedURI;
        baseURI = _baseURI;
    }

    function airdrop(address[] memory airdrops) external onlyRealOwner{
        require(airdropped == false, "already airdropped");
        for(uint i=0; i<airdrops.length; i++){
            _mint(airdrops[i], 1, '', false);
        }
        airdropped = true;
    }

    function setParams(string memory newBaseURI, string memory newUnrevealedURI, bool newFinal, bool newUseFancyMath) external onlyRealOwner {
        require(finalized == false, "final");
        baseURI = newBaseURI;
        unrevealedURI = newUnrevealedURI;
        finalized = newFinal;
        useFancyMath = newUseFancyMath;
    }

    function retrieveFunds(address payable to) external onlyRealOwner {
        to.transfer(address(this).balance);
    }

    // SALE

    function toBytes32(address addr) pure internal returns (bytes32){
        return bytes32(uint256(uint160(addr)));
    }

    // CAUTION: Never introduce any kind of batch processing for mint() or mintFromSale() since then people can
    // execute the same bug that appeared on sushi's bitDAO auction
    // There are some issues with merkle trees such as pre-image attacks or possibly duplicated leaves on
    // unbalanced trees, but here we protect against them by checking against msg.sender and only allowing each account to claim once
    // See https://github.com/miguelmota/merkletreejs#notes for more info
    mapping(address=>bool) public claimed;
    function mint(bytes32[] calldata _merkleProof) public payable {
        require(MerkleProof.verify(_merkleProof, merkleRoot, toBytes32(msg.sender)) == true, "wrong merkle proof");
        require(claimed[msg.sender] == false, "already claimed");
        claimed[msg.sender] = true;
        require(msg.value == 0.1 ether, "wrong payment");
        _mint(msg.sender, 1, '', false);
        require(totalSupply() <= TOKEN_LIMIT, "limit reached");
    }

    function mintFromSale(uint tubbiesToMint) public payable {
        require(block.timestamp > startSaleTimestamp, "Public sale hasn't started yet");
        require(tubbiesToMint <= 5, "Only up to 5 tubbies can be minted at once");
        uint cost;
        unchecked {
            cost = tubbiesToMint * 0.1 ether;
        }
        require(msg.value == cost, "wrong payment");
        _mint(msg.sender, tubbiesToMint, '', false);
        require(totalSupply() <= TOKEN_LIMIT, "limit reached");
    }

    // RANDOMIZATION

    uint public lastTokenRevealed = 0;
    // Can be made callable by everyone but restricting to onlyRealOwner for extra security
    // batchNumber belongs to [0, TOKEN_LIMIT/REVEAL_BATCH_SIZE]
    // if fee is incorrect chainlink's coordinator will just revert the tx so it's good
    function requestRandomSeed(uint s_fee) public onlyRealOwner returns (bytes32 requestId) {
        require(totalSupply() >= (lastTokenRevealed + REVEAL_BATCH_SIZE), "totalSupply too low");

        // checking LINK balance
        require(IERC20(linkToken).balanceOf(address(this)) >= s_fee, "Not enough LINK to pay fee");

        // requesting randomness
        requestId = requestRandomness(s_keyHash, s_fee);
    }

    function fulfillRandomness(bytes32, uint256 randomness) internal override {
        require(totalSupply() >= (lastTokenRevealed + REVEAL_BATCH_SIZE), "totalSupply too low");
        uint batchNumber = lastTokenRevealed/REVEAL_BATCH_SIZE;
        // not perfectly random since the folding doesn't match bounds perfectly, but difference is small
        batchToSeed[batchNumber] = randomness % (TOKEN_LIMIT - (batchNumber*REVEAL_BATCH_SIZE));
        unchecked {
            lastTokenRevealed += REVEAL_BATCH_SIZE;
        }
    }

    // OPTIMIZATION: No need for numbers to be readable, so this could be optimized
    // but gas cost here doesn't matter so we go for the standard approach
    function tokenURI(uint256 id) public view override returns (string memory) {
        if(!useFancyMath){
            return string(abi.encodePacked(baseURI, id.toString()));
        }
        if(id >= lastTokenRevealed){
            return unrevealedURI;
        } else {
            uint batch = id/REVEAL_BATCH_SIZE;
            return string(abi.encodePacked(baseURI, getShuffledTokenId(id, batch).toString(), ".json"));
        }
    }
}

File 2 of 19 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

File 3 of 19 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

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 4 of 19 : MultisigOwnable.sol
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";

/*
Opensea only allows EOAs to make changes to collections,
which makes it impossible to use multisigs to secure these NFT contracts
since when you want to make changes you need to transfer ownership to an EOA, who can rug.

This contract establishes a second owner that can change the EOA owner,
this way a multisig can give ownership to an EOA and later claim it back.
*/
abstract contract MultisigOwnable is Ownable {
    address public realOwner;

    constructor() {
        realOwner = msg.sender;
    }

    modifier onlyRealOwner() {
        require(realOwner == msg.sender, "MultisigOwnable: caller is not the real owner");
        _;
    }

    function transferRealOwnership(address newRealOwner) public onlyRealOwner {
        realOwner = newRealOwner;
    }

    function transferLowerOwnership(address newOwner) public onlyRealOwner {
        _transferOwnership(newOwner);
    }
}

File 5 of 19 : VRFConsumerBase.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./interfaces/LinkTokenInterface.sol";

import "./VRFRequestIDBase.sol";

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator, _link) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash), and have told you the minimum LINK
 * @dev price for VRF service. Make sure your contract has sufficient LINK, and
 * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you
 * @dev want to generate randomness from.
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomness method.
 *
 * @dev The randomness argument to fulfillRandomness is the actual random value
 * @dev generated from your seed.
 *
 * @dev The requestId argument is generated from the keyHash and the seed by
 * @dev makeRequestId(keyHash, seed). If your contract could have concurrent
 * @dev requests open, you can use the requestId to track which seed is
 * @dev associated with which randomness. See VRFRequestIDBase.sol for more
 * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.)
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ. (Which is critical to making unpredictable randomness! See the
 * @dev next section.)
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the ultimate input to the VRF is mixed with the block hash of the
 * @dev block in which the request is made, user-provided seeds have no impact
 * @dev on its economic security properties. They are only included for API
 * @dev compatability with previous versions of this contract.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request.
 */
abstract contract VRFConsumerBase is VRFRequestIDBase {
  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBase expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomness the VRF output
   */
  function fulfillRandomness(bytes32 requestId, uint256 randomness) internal virtual;

  /**
   * @dev In order to keep backwards compatibility we have kept the user
   * seed field around. We remove the use of it because given that the blockhash
   * enters later, it overrides whatever randomness the used seed provides.
   * Given that it adds no security, and can easily lead to misunderstandings,
   * we have removed it from usage and can now provide a simpler API.
   */
  uint256 private constant USER_SEED_PLACEHOLDER = 0;

  /**
   * @notice requestRandomness initiates a request for VRF output given _seed
   *
   * @dev The fulfillRandomness method receives the output, once it's provided
   * @dev by the Oracle, and verified by the vrfCoordinator.
   *
   * @dev The _keyHash must already be registered with the VRFCoordinator, and
   * @dev the _fee must exceed the fee specified during registration of the
   * @dev _keyHash.
   *
   * @dev The _seed parameter is vestigial, and is kept only for API
   * @dev compatibility with older versions. It can't *hurt* to mix in some of
   * @dev your own randomness, here, but it's not necessary because the VRF
   * @dev oracle will mix the hash of the block containing your request into the
   * @dev VRF seed it ultimately uses.
   *
   * @param _keyHash ID of public key against which randomness is generated
   * @param _fee The amount of LINK to send with the request
   *
   * @return requestId unique ID for this request
   *
   * @dev The returned requestId can be used to distinguish responses to
   * @dev concurrent requests. It is passed as the first argument to
   * @dev fulfillRandomness.
   */
  function requestRandomness(bytes32 _keyHash, uint256 _fee) internal returns (bytes32 requestId) {
    LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER));
    // This is the seed passed to VRFCoordinator. The oracle will mix this with
    // the hash of the block containing this request to obtain the seed/input
    // which is finally passed to the VRF cryptographic machinery.
    uint256 vRFSeed = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]);
    // nonces[_keyHash] must stay in sync with
    // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above
    // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest).
    // This provides protection against the user repeating their input seed,
    // which would result in a predictable/duplicate output, if multiple such
    // requests appeared in the same block.
    nonces[_keyHash] = nonces[_keyHash] + 1;
    return makeRequestId(_keyHash, vRFSeed);
  }

  LinkTokenInterface internal immutable LINK;
  address private immutable vrfCoordinator;

  // Nonces for each VRF key from which randomness has been requested.
  //
  // Must stay in sync with VRFCoordinator[_keyHash][this]
  mapping(bytes32 => uint256) /* keyHash */ /* nonce */
    private nonces;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   * @param _link address of LINK token contract
   *
   * @dev https://docs.chain.link/docs/link-token-contracts
   */
  constructor(address _vrfCoordinator, address _link) {
    vrfCoordinator = _vrfCoordinator;
    LINK = LinkTokenInterface(_link);
  }

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomness(bytes32 requestId, uint256 randomness) external {
    require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill");
    fulfillRandomness(requestId, randomness);
  }
}

File 6 of 19 : MerkleProof.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }
        return computedHash;
    }
}

File 7 of 19 : ERC721A.sol
// SPDX-License-Identifier: MIT
// Creator: Chiru Labs

// Fork of ERC721A.sol (it's not the same one as on npm package erc721a because this one has extension methods removed)

pragma solidity ^0.8.4;

import '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import '@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol';
import '@openzeppelin/contracts/utils/Address.sol';
import '@openzeppelin/contracts/utils/Context.sol';
import '@openzeppelin/contracts/utils/Strings.sol';
import '@openzeppelin/contracts/utils/introspection/ERC165.sol';

error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error ApproveToCaller();
error ApprovalToCurrentOwner();
error BalanceQueryForZeroAddress();
error MintedQueryForZeroAddress();
error BurnedQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerIndexOutOfBounds();
error OwnerQueryForNonexistentToken();
error TokenIndexOutOfBounds();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error URIQueryForNonexistentToken();

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata and Enumerable extension. Built to optimize for lower gas during batch mints.
 *
 * Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).
 *
 * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.
 *
 * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256).
 */
contract ERC721A is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Compiler will pack this into a single 256bit word.
    struct TokenOwnership {
        // The address of the owner.
        address addr;
        // Keeps track of the start time of ownership with minimal overhead for tokenomics.
        uint64 startTimestamp;
        // Whether the token has been burned.
        bool burned;
    }

    // Compiler will pack this into a single 256bit word.
    struct AddressData {
        // Realistically, 2**64-1 is more than enough.
        uint64 balance;
        // Keeps track of mint count with minimal overhead for tokenomics.
        uint64 numberMinted;
        // Keeps track of burn count with minimal overhead for tokenomics.
        uint64 numberBurned;
    }

    // The tokenId of the next token to be minted.
    uint256 internal _currentIndex;

    // The number of tokens burned.
    uint256 internal _burnCounter;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to ownership details
    // An empty struct value does not necessarily mean the token is unowned. See ownershipOf implementation for details.
    mapping(uint256 => TokenOwnership) internal _ownerships;

    // Mapping owner address to address data
    mapping(address => AddressData) private _addressData;

    // 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;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        // Counter underflow is impossible as _burnCounter cannot be incremented
        // more than _currentIndex times
        unchecked {
            return _currentIndex - _burnCounter;    
        }
    }

    /**
     * @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 override returns (uint256) {
        if (owner == address(0)) revert BalanceQueryForZeroAddress();
        return uint256(_addressData[owner].balance);
    }

    function _numberMinted(address owner) internal view returns (uint256) {
        if (owner == address(0)) revert MintedQueryForZeroAddress();
        return uint256(_addressData[owner].numberMinted);
    }

    function _numberBurned(address owner) internal view returns (uint256) {
        if (owner == address(0)) revert BurnedQueryForZeroAddress();
        return uint256(_addressData[owner].numberBurned);
    }

    /**
     * Gas spent here starts off proportional to the maximum mint batch size.
     * It gradually moves to O(1) as tokens get transferred around in the collection over time.
     */
    function ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {
        uint256 curr = tokenId;

        unchecked {
            if (curr < _currentIndex) {
                TokenOwnership memory ownership = _ownerships[curr];
                if (!ownership.burned) {
                    if (ownership.addr != address(0)) {
                        return ownership;
                    }
                    // Invariant: 
                    // There will always be an ownership that has an address and is not burned 
                    // before an ownership that does not have an address and is not burned.
                    // Hence, curr will not underflow.
                    while (true) {
                        curr--;
                        ownership = _ownerships[curr];
                        if (ownership.addr != address(0)) {
                            return ownership;
                        }
                    }
                }
            }
        }
        revert OwnerQueryForNonexistentToken();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view override returns (address) {
        return ownershipOf(tokenId).addr;
    }

    /**
     * @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) {
        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();

        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 override {
        address owner = ERC721A.ownerOf(tokenId);
        if (to == owner) revert ApprovalToCurrentOwner();

        if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender())) {
            revert ApprovalCallerNotOwnerNorApproved();
        }

        _approve(to, tokenId, owner);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view override returns (address) {
        if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public override {
        if (operator == _msgSender()) revert ApproveToCaller();

        _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 {
        _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 {
        _transfer(from, to, tokenId);
        if (!_checkOnERC721Received(from, to, tokenId, _data)) {
            revert TransferToNonERC721ReceiverImplementer();
        }
    }

    /**
     * @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`),
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        return tokenId < _currentIndex && !_ownerships[tokenId].burned;
    }

    function _safeMint(address to, uint256 quantity) internal {
        _safeMint(to, quantity, '');
    }

    /**
     * @dev Safely mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called for each safe transfer.
     * - `quantity` must be greater than 0.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(
        address to,
        uint256 quantity,
        bytes memory _data
    ) internal {
        _mint(to, quantity, _data, true);
    }

    /**
     * @dev Mints `quantity` tokens and transfers them to `to`.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `quantity` must be greater than 0.
     *
     * Emits a {Transfer} event.
     */
    function _mint(
        address to,
        uint256 quantity,
        bytes memory _data,
        bool safe
    ) internal {
        uint256 startTokenId = _currentIndex;
        if (to == address(0)) revert MintToZeroAddress();
        if (quantity == 0) revert MintZeroQuantity();

        _beforeTokenTransfers(address(0), to, startTokenId, quantity);

        // Overflows are incredibly unrealistic.
        // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1
        // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1
        unchecked {
            _addressData[to].balance += uint64(quantity);
            _addressData[to].numberMinted += uint64(quantity);

            _ownerships[startTokenId].addr = to;
            _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);

            uint256 updatedIndex = startTokenId;

            for (uint256 i; i < quantity; i++) {
                emit Transfer(address(0), to, updatedIndex);
                if (safe && !_checkOnERC721Received(address(0), to, updatedIndex, _data)) {
                    revert TransferToNonERC721ReceiverImplementer();
                }
                updatedIndex++;
            }

            _currentIndex = updatedIndex;
        }
        _afterTokenTransfers(address(0), to, startTokenId, quantity);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *
     * 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
    ) private {
        TokenOwnership memory prevOwnership = ownershipOf(tokenId);

        bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||
            isApprovedForAll(prevOwnership.addr, _msgSender()) ||
            getApproved(tokenId) == _msgSender());

        if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
        if (prevOwnership.addr != from) revert TransferFromIncorrectOwner();
        if (to == address(0)) revert TransferToZeroAddress();

        _beforeTokenTransfers(from, to, tokenId, 1);

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

        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.
        unchecked {
            _addressData[from].balance -= 1;
            _addressData[to].balance += 1;

            _ownerships[tokenId].addr = to;
            _ownerships[tokenId].startTimestamp = uint64(block.timestamp);

            // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.
            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
            uint256 nextTokenId = tokenId + 1;
            if (_ownerships[nextTokenId].addr == address(0)) {
                // This will suffice for checking _exists(nextTokenId),
                // as a burned slot cannot contain the zero address.
                if (nextTokenId < _currentIndex) {
                    _ownerships[nextTokenId].addr = prevOwnership.addr;
                    _ownerships[nextTokenId].startTimestamp = prevOwnership.startTimestamp;
                }
            }
        }

        emit Transfer(from, to, tokenId);
        _afterTokenTransfers(from, to, tokenId, 1);
    }

    /**
     * @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 {
        TokenOwnership memory prevOwnership = ownershipOf(tokenId);

        _beforeTokenTransfers(prevOwnership.addr, address(0), tokenId, 1);

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

        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.
        unchecked {
            _addressData[prevOwnership.addr].balance -= 1;
            _addressData[prevOwnership.addr].numberBurned += 1;

            // Keep track of who burned the token, and the timestamp of burning.
            _ownerships[tokenId].addr = prevOwnership.addr;
            _ownerships[tokenId].startTimestamp = uint64(block.timestamp);
            _ownerships[tokenId].burned = true;

            // If the ownership slot of tokenId+1 is not explicitly set, that means the burn initiator owns it.
            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.
            uint256 nextTokenId = tokenId + 1;
            if (_ownerships[nextTokenId].addr == address(0)) {
                // This will suffice for checking _exists(nextTokenId),
                // as a burned slot cannot contain the zero address.
                if (nextTokenId < _currentIndex) {
                    _ownerships[nextTokenId].addr = prevOwnership.addr;
                    _ownerships[nextTokenId].startTimestamp = prevOwnership.startTimestamp;
                }
            }
        }

        emit Transfer(prevOwnership.addr, address(0), tokenId);
        _afterTokenTransfers(prevOwnership.addr, address(0), tokenId, 1);

        // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.
        unchecked { 
            _burnCounter++;
        }
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(
        address to,
        uint256 tokenId,
        address owner
    ) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(owner, 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 TransferToNonERC721ReceiverImplementer();
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.
     * And also called before burning one token.
     *
     * startTokenId - the first token id to be transferred
     * quantity - the amount to be transferred
     *
     * 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, `tokenId` will be burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _beforeTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}

    /**
     * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes
     * minting.
     * And also called after one token has been burned.
     *
     * startTokenId - the first token id to be transferred
     * quantity - the amount to be transferred
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been
     * transferred to `to`.
     * - When `from` is zero, `tokenId` has been minted for `to`.
     * - When `to` is zero, `tokenId` has been burned by `from`.
     * - `from` and `to` are never both zero.
     */
    function _afterTokenTransfers(
        address from,
        address to,
        uint256 startTokenId,
        uint256 quantity
    ) internal virtual {}
}

File 8 of 19 : BatchReveal.sol
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/*
  See ../../randomness.md
*/
abstract contract BatchReveal {
    uint constant public TOKEN_LIMIT = 20e3;
    uint constant public REVEAL_BATCH_SIZE = 1e3;
    mapping(uint => uint) public batchToSeed;

    struct Range{
        int128 start;
        int128 end;
    }

    // Forked from openzeppelin
    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(int128 a, int128 b) internal pure returns (int128) {
        return a < b ? a : b;
    }

    uint constant RANGE_LENGTH = (TOKEN_LIMIT/REVEAL_BATCH_SIZE)*2;
    int128 constant intTOKEN_LIMIT = int128(int(TOKEN_LIMIT));

    // ranges include the start but not the end [start, end)
    function addRange(Range[RANGE_LENGTH] memory ranges, int128 start, int128 end, uint lastIndex) pure private returns (uint) {
        uint positionToAssume = lastIndex;
        for(uint j=0; j<lastIndex; j++){
            int128 rangeStart = ranges[j].start;
            int128 rangeEnd = ranges[j].end;
            if(start < rangeStart && positionToAssume == lastIndex){
                positionToAssume = j;
            }
            if(
                (start < rangeStart && end > rangeStart) ||
                (rangeStart <= start &&  end <= rangeEnd) ||
                (start < rangeEnd && end > rangeEnd)
            ){
                int128 length = end-start;
                start = min(start, rangeStart);
                end = start + length + (rangeEnd-rangeStart);
                ranges[j] = Range(-1,-1); // Delete
            }
        }
        for(uint pos = lastIndex; pos > positionToAssume; pos--){
            ranges[pos] = ranges[pos-1];
        }
        ranges[positionToAssume] = Range(start, min(end, intTOKEN_LIMIT));
        lastIndex++;
        if(end > intTOKEN_LIMIT){
            addRange(ranges, 0, end - intTOKEN_LIMIT, lastIndex);
            lastIndex++;
        }
        return lastIndex;
    }

    function buildJumps(uint lastBatch) view private returns (Range[RANGE_LENGTH] memory) {
        Range[RANGE_LENGTH] memory ranges;
        uint lastIndex = 0;
        for(uint i=0; i<lastBatch; i++){
            int128 start = int128(int(getFreeTokenId(batchToSeed[i], ranges)));
            int128 end = start + int128(int(REVEAL_BATCH_SIZE));
            lastIndex = addRange(ranges, start, end, lastIndex);
        }
        return ranges;
    }

    function getShuffledTokenId(uint startId, uint batch) view internal returns (uint) {
        Range[RANGE_LENGTH] memory ranges = buildJumps(batch);
        uint positionsToMove = (startId % REVEAL_BATCH_SIZE) + batchToSeed[batch];
        return getFreeTokenId(positionsToMove, ranges);
    }

    function getFreeTokenId(uint positionsToMoveStart, Range[RANGE_LENGTH] memory ranges) pure private returns (uint) {
        int128 positionsToMove = int128(int(positionsToMoveStart));
        int128 id = 0;

        for(uint round = 0; round<2; round++){
            for(uint i=0; i<RANGE_LENGTH; i++){
                int128 start = ranges[i].start;
                int128 end = ranges[i].end;
                if(id < start){
                    int128 finalId = id + positionsToMove;
                    if(finalId < start){
                        return uint(uint128(finalId));
                    } else {
                        positionsToMove -= start - id;
                        id = end;
                    }
                } else if(id < end){
                    id = end;
                }
            }
            if((id + positionsToMove) >= intTOKEN_LIMIT){
                positionsToMove -= intTOKEN_LIMIT - id;
                id = 0;
            }
        }
        return uint(uint128(id + positionsToMove));
    }
}

File 9 of 19 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

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() {
        _transferOwnership(_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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 10 of 19 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

File 11 of 19 : LinkTokenInterface.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {
  function allowance(address owner, address spender) external view returns (uint256 remaining);

  function approve(address spender, uint256 value) external returns (bool success);

  function balanceOf(address owner) external view returns (uint256 balance);

  function decimals() external view returns (uint8 decimalPlaces);

  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);

  function increaseApproval(address spender, uint256 subtractedValue) external;

  function name() external view returns (string memory tokenName);

  function symbol() external view returns (string memory tokenSymbol);

  function totalSupply() external view returns (uint256 totalTokensIssued);

  function transfer(address to, uint256 value) external returns (bool success);

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  ) external returns (bool success);

  function transferFrom(
    address from,
    address to,
    uint256 value
  ) external returns (bool success);
}

File 12 of 19 : VRFRequestIDBase.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract VRFRequestIDBase {
  /**
   * @notice returns the seed which is actually input to the VRF coordinator
   *
   * @dev To prevent repetition of VRF output due to repetition of the
   * @dev user-supplied seed, that seed is combined in a hash with the
   * @dev user-specific nonce, and the address of the consuming contract. The
   * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in
   * @dev the final seed, but the nonce does protect against repetition in
   * @dev requests which are included in a single block.
   *
   * @param _userSeed VRF seed input provided by user
   * @param _requester Address of the requesting contract
   * @param _nonce User-specific nonce at the time of the request
   */
  function makeVRFInputSeed(
    bytes32 _keyHash,
    uint256 _userSeed,
    address _requester,
    uint256 _nonce
  ) internal pure returns (uint256) {
    return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce)));
  }

  /**
   * @notice Returns the id for this request
   * @param _keyHash The serviceAgreement ID to be used for this request
   * @param _vRFInputSeed The seed to be passed directly to the VRF
   * @return The id for this request
   *
   * @dev Note that _vRFInputSeed is not the seed passed by the consuming
   * @dev contract, but the one generated by makeVRFInputSeed
   */
  function makeRequestId(bytes32 _keyHash, uint256 _vRFInputSeed) internal pure returns (bytes32) {
    return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed));
  }
}

File 13 of 19 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

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

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

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

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

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

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

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

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

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

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

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

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

File 14 of 19 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

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

File 15 of 19 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 16 of 19 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)

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 17 of 19 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 18 of 19 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 19 of 19 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

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

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

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"bytes32","name":"_merkleRoot","type":"bytes32"},{"internalType":"string","name":"_baseURI","type":"string"},{"internalType":"string","name":"_unrevealedURI","type":"string"},{"internalType":"bytes32","name":"_s_keyHash","type":"bytes32"},{"internalType":"address","name":"_linkToken","type":"address"},{"internalType":"address","name":"_linkCoordinator","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ApprovalCallerNotOwnerNorApproved","type":"error"},{"inputs":[],"name":"ApprovalQueryForNonexistentToken","type":"error"},{"inputs":[],"name":"ApprovalToCurrentOwner","type":"error"},{"inputs":[],"name":"ApproveToCaller","type":"error"},{"inputs":[],"name":"BalanceQueryForZeroAddress","type":"error"},{"inputs":[],"name":"MintToZeroAddress","type":"error"},{"inputs":[],"name":"MintZeroQuantity","type":"error"},{"inputs":[],"name":"OwnerQueryForNonexistentToken","type":"error"},{"inputs":[],"name":"TransferCallerNotOwnerNorApproved","type":"error"},{"inputs":[],"name":"TransferFromIncorrectOwner","type":"error"},{"inputs":[],"name":"TransferToNonERC721ReceiverImplementer","type":"error"},{"inputs":[],"name":"TransferToZeroAddress","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"REVEAL_BATCH_SIZE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TOKEN_LIMIT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"airdrops","type":"address[]"}],"name":"airdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"airdropped","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"batchToSeed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"claimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"finalized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastTokenRevealed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"merkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"_merkleProof","type":"bytes32[]"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tubbiesToMint","type":"uint256"}],"name":"mintFromSale","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"requestId","type":"bytes32"},{"internalType":"uint256","name":"randomness","type":"uint256"}],"name":"rawFulfillRandomness","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"realOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"s_fee","type":"uint256"}],"name":"requestRandomSeed","outputs":[{"internalType":"bytes32","name":"requestId","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"to","type":"address"}],"name":"retrieveFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"newBaseURI","type":"string"},{"internalType":"string","name":"newUnrevealedURI","type":"string"},{"internalType":"bool","name":"newFinal","type":"bool"},{"internalType":"bool","name":"newUseFancyMath","type":"bool"}],"name":"setParams","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startSaleTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","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":"transferLowerOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newRealOwner","type":"address"}],"name":"transferRealOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unrevealedURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"useFancyMath","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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

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

-----Decoded View---------------
Arg [0] : _merkleRoot (bytes32): 0x432b7354b99a2b9c27e7b60d580c6ec20ba5949d2d7fc92c91ac69b4c4cfdd4d
Arg [1] : _baseURI (string): ipfs://QmUbTNJ3tnMyS14JVaLAZj3uPCxKDAKnXDJXS1pFtpUHL9/
Arg [2] : _unrevealedURI (string): ipfs://QmWEsF23zM2C1afa6G9XwgBhqJsPH9CyQTDpToap1MD4Un
Arg [3] : _s_keyHash (bytes32): 0xaa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af445
Arg [4] : _linkToken (address): 0x514910771AF9Ca656af840dff83E8264EcF986CA
Arg [5] : _linkCoordinator (address): 0xf0d54349aDdcf704F77AE15b96510dEA15cb7952

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 432b7354b99a2b9c27e7b60d580c6ec20ba5949d2d7fc92c91ac69b4c4cfdd4d
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [3] : aa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af445
Arg [4] : 000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca
Arg [5] : 000000000000000000000000f0d54349addcf704f77ae15b96510dea15cb7952
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000036
Arg [7] : 697066733a2f2f516d5562544e4a33746e4d795331344a56614c415a6a337550
Arg [8] : 43784b44414b6e58444a5853317046747055484c392f00000000000000000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000035
Arg [10] : 697066733a2f2f516d5745734632337a4d324331616661364739587767426871
Arg [11] : 4a73504839437951544470546f6170314d4434556e0000000000000000000000


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.