Contract 0x163a7af239b409E79a32fC6b437Fda51dd8fa5F0 4

Token Contract 
 
 
Txn Hash
Method
Block
From
To
Value
0x6ddf870744dc5a62e2861eca03b5d2866837da7c3d78d5d734df8f2bcff233daSet Approval For...160850532022-11-30 20:01:2311 mins ago0xcbf4950aa2d793ff5eb004a73a10c2d56e42c13b IN  RoaringLeaders: ROAR Token0 Ether0.00067889 14.54729798
0x666966dace9d3653139a166d66d1d5826ab05c6d7a15ab5f915d1e29bede2295Set Approval For...160783492022-11-29 21:32:3522 hrs 39 mins agoENS Name jujuking.eth IN  RoaringLeaders: ROAR Token0 Ether0.00054469 11.6656703
0x18c6e1ab07224f80cbda38be27c48dc30450a5674648e654ae95fb1cce97d694Transfer From160473312022-11-25 13:34:355 days 6 hrs ago0xa78d7d4b328c8f0078c6ecd1e759f60cd9f4d589 IN  RoaringLeaders: ROAR Token0 Ether0.00087636 9.98227401
0x214752d69b6e2542e81737a02fa293b66a016bdb5ead6f06fb1949d4d5286365Transfer From160473302022-11-25 13:34:235 days 6 hrs ago0xa78d7d4b328c8f0078c6ecd1e759f60cd9f4d589 IN  RoaringLeaders: ROAR Token0 Ether0.00095238 9.97816097
0xda8ec763c5f4d4bbb5973584281b698f1d5d3555e9d1c2cd7cb7b5ba3344f194Set Approval For...160433002022-11-25 0:03:595 days 20 hrs ago0xb644358c6b1e06f1f0301fb0e0f6d2ba7197c842 IN  RoaringLeaders: ROAR Token0 Ether0.00053055 11.36865726
0x7a94aa7d258b3f96b3f070d51602a979d2dc4d793a7945bd9b461286cd275e7dSet Approval For...160399372022-11-24 12:48:236 days 7 hrs agoENS Name mybooty.eth IN  RoaringLeaders: ROAR Token0 Ether0.0002887 11.62260956
0x393c6a6d0ff7e23159ee4130bb13534165ff6e669322f044b0cffe47b4ffcd9fSet Approval For...160395422022-11-24 11:28:476 days 8 hrs agoENS Name magiclars.eth IN  RoaringLeaders: ROAR Token0 Ether0.00054386 11.64786094
0x146c2d33f737fec38230f1e85ebc0655ef6079f8aa2e62290f98e83510c48ff7Set Approval For...160281002022-11-22 21:03:237 days 23 hrs ago0x7846d5ccd3d85374087e12c444a9bc19b18deb68 IN  RoaringLeaders: ROAR Token0 Ether0.0007492 16.0539681
0xe83e70f94492040073da8a9a3d8588f2563f42387cfa00db65d6584a67e6de39Set Approval For...160131342022-11-20 18:51:5910 days 1 hr ago0x324c88b7c20670ce4f53338fb08a1f97254eae0c IN  RoaringLeaders: ROAR Token0 Ether0.00057434 12.30066894
0x1a31c3ae105e3b357053ce8b653e456620d0e7df503aef40e8431048d2dfdb59Set Approval For...160126282022-11-20 17:10:3510 days 3 hrs agoENS Name cepdy4ek.eth IN  RoaringLeaders: ROAR Token0 Ether0.00076559 16.39665391
0x7c7ef6a357c86ed2cea861a210055ce1fe769617d50dfda20e9fa7971cf28903Set Approval For...160112422022-11-20 12:31:3510 days 7 hrs agoENS Name moonmars.eth IN  RoaringLeaders: ROAR Token0 Ether0.00057623 12.32545328
0x35ca284dfd8b39d9199e099885e60292e5fa149a315accb0868371f263a44fe9Set Approval For...159984572022-11-18 17:41:4712 days 2 hrs ago0xc0bd2cabf9b8b01d6af435683b9eb440f6d53e59 IN  RoaringLeaders: ROAR Token0 Ether0.00063969 13.70730247
0x5aef849f9ef239c506b84c76d7bc4db90dc01ba2a3765968ab7850e393eb8d65Set Approval For...159910542022-11-17 16:51:5913 days 3 hrs ago0x108f03753625cc4be104c6e02a5072e7f15738d3 IN  RoaringLeaders: ROAR Token0 Ether0.00142501 30.53524871
0x5b74cf32d35c7d013ea3d664161e99e23ad83bcc3011ce53d01b08c12ae658e2Set Approval For...159869132022-11-17 2:59:4713 days 17 hrs ago0x56d5a1bd14bce9ca855d185fb751a76d69b948cc IN  RoaringLeaders: ROAR Token0 Ether0.00059352 12.71805569
0xe2d9b66f967bc54fbc328b41e26708be18091fa7c79c919b87e829bc6c18da6dSet Approval For...159852762022-11-16 21:30:5913 days 22 hrs ago0x6b605da728303c255054d60affbdcafe8da9a22c IN  RoaringLeaders: ROAR Token0 Ether0.00107064 22.92997572
0xa72b2ebe693731797d51a1902d2c6a49f61e762b9728116abcf1b80b4c645d1dSet Approval For...159777572022-11-15 20:16:3514 days 23 hrs ago0x78ae59cce8ce5c9d7c660059759f116bb1144cdf IN  RoaringLeaders: ROAR Token0 Ether0.00086921 18.6159019
0x4f7c64cccc64ccbfe6cf202a66aa8ece302003721741c0bc25a11065c658b5ffSet Approval For...159738022022-11-15 6:59:3515 days 13 hrs ago0x7c4e643862068a8383a5fadc7b11069fe3e19cdd IN  RoaringLeaders: ROAR Token0 Ether0.00074261 15.91270833
0x8e8f23fb74290a75d8d3b572e0fdbf9a416ab395cf34cdd963f67a9ae0ada6a9Set Approval For...159697242022-11-14 17:19:2316 days 2 hrs ago0x3a0da553892fe844272343df675ffa0839084fbd IN  RoaringLeaders: ROAR Token0 Ether0.00088861 19.04124626
0xcc049508efc64e062d736b781985658b336f73e4046e7cb07a1abe99553fc693Set Approval For...159676932022-11-14 10:31:4716 days 9 hrs ago0x4d042ba5acc3ce6ec3098b291ec57db81653f8a5 IN  RoaringLeaders: ROAR Token0 Ether0.00071727 15.3618117
0x290882ae491fbad3d01dbb3524c54a9c37990ffd844ffaedf2e598c00651bfb2Set Approval For...159636462022-11-13 20:58:3516 days 23 hrs ago0x8fd595b17ac0206e52d3569a5031aa08bed77980 IN  RoaringLeaders: ROAR Token0 Ether0.00077776 16.66584476
0x64de5443312ef6c9b324069814696a61e02159c3f644912de6f20036c3e5f9b8Set Approval For...159596232022-11-13 7:31:1117 days 12 hrs ago0x790992538e18e817b2d5666ace0d8d9024cc72eb IN  RoaringLeaders: ROAR Token0 Ether0.00065231 13.97782488
0x0d8f9637943841ff582e832bf59c9cdd8ccfc44cbbc3bdcd2211c0a949374d34Safe Transfer Fr...159569082022-11-12 22:25:3517 days 21 hrs ago0xa9764388e726560281db0e9eb6ea57109773f99b IN  RoaringLeaders: ROAR Token0 Ether0.00092239 10.49297323
0x26b7928c9d919dcb560338b46b36390db0e3ef5f002be775be8c1b677c8efe11Set Approval For...159511092022-11-12 2:59:5918 days 17 hrs ago0xc3cea12ffda8b3dff435155461de6fcc72315117 IN  RoaringLeaders: ROAR Token0 Ether0.00077996 16.70451116
0x014487a197cbae9c4144dea1605ac1202967081da7b91a4a00b5dec73edf1d03Set Approval For...159246372022-11-08 10:12:3522 days 9 hrs agoENS Name reever.eth IN  RoaringLeaders: ROAR Token0 Ether0.00069266 14.8347897
0xae54089ef6bde542c17704ad1d0630eb52668ac8e76f2e8494ef8d0cb5ff2c04Set Approval For...159242892022-11-08 9:02:4722 days 11 hrs agoENS Name thumbpick.eth IN  RoaringLeaders: ROAR Token0 Ether0.00063674 13.6372373
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OVERVIEW

Roaring Leaders is a unique deflationary collection of generative NFTs on the ethereum blockchain designed by a Marvel artist. Our artwork includes ~200+ handcrafted traits to capture the spirit and energy defining the leaders of the world represented by the lions and tigers o...

Latest 10 internal transactions
Parent Txn Hash Block From To Value
0xc53abd6dadc83466fa19150c58b85e15d77ed6b296e560e964631e964ee0bb9e133350972021-10-01 18:27:27425 days 1 hr ago RoaringLeaders: ROAR Token0x0313b09e8ee8a0932dbeb76c4d7c46055969c7c4114.534774 Ether
0xc53abd6dadc83466fa19150c58b85e15d77ed6b296e560e964631e964ee0bb9e133350972021-10-01 18:27:27425 days 1 hr ago RoaringLeaders: ROAR TokenENS Name nerdminter.eth277.294716 Ether
0xc53abd6dadc83466fa19150c58b85e15d77ed6b296e560e964631e964ee0bb9e133350972021-10-01 18:27:27425 days 1 hr ago RoaringLeaders: ROAR TokenENS Name treasures.eth210.98511 Ether
0x94f3b0cb011943452aec81dfd2f04eeb1c3524a030977a33461d686f1574c54b133350682021-10-01 18:22:58425 days 1 hr ago RoaringLeaders: ROAR Token0x0313b09e8ee8a0932dbeb76c4d7c46055969c7c40.19 Ether
0x94f3b0cb011943452aec81dfd2f04eeb1c3524a030977a33461d686f1574c54b133350682021-10-01 18:22:58425 days 1 hr ago RoaringLeaders: ROAR TokenENS Name nerdminter.eth0.46 Ether
0x94f3b0cb011943452aec81dfd2f04eeb1c3524a030977a33461d686f1574c54b133350682021-10-01 18:22:58425 days 1 hr ago RoaringLeaders: ROAR TokenENS Name treasures.eth0.35 Ether
0x83a25e162440b6769d779211521347d9f074e31c44ab0a5effc794b6991cee39133276462021-09-30 14:41:50426 days 5 hrs ago RoaringLeaders: ROAR Token0x5c5321ae45550685308a405827575e3d6b4a84aa2.0004 Ether
0x478ad99fd9deb34b176940e705293d2347fed5d9d3ca3a6a22e3d41daa88c8eb133152032021-09-28 16:04:02428 days 4 hrs ago RoaringLeaders: ROAR Token0x1b811fab3618e727d5d38d7e6338262ca372a3ca1.75 Ether
0x700564b1288af4d2a5f74fa7d07b86ebb310f9e48816b5899a906521bb919b94133004132021-09-26 8:44:06430 days 11 hrs ago RoaringLeaders: ROAR TokenGenesisRoaringLeaders: Deployer4 Ether
0x22b7f2e2cf4854cb843e26825d767313fb7a9b0825d6467e216c86f0411c30ad133004062021-09-26 8:41:09430 days 11 hrs ago RoaringLeaders: ROAR TokenENS Name treasures.eth6 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
RoaringLeaders

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
No with 200 runs

Other Settings:
byzantium EvmVersion
File 1 of 15 : RoaringLeaders.sol
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

/*
    ____  ____  ___    ____  _____   ________   __    _________    ____  __________  _____
   / __ \/ __ \/   |  / __ \/  _/ | / / ____/  / /   / ____/   |  / __ \/ ____/ __ \/ ___/
  / /_/ / / / / /| | / /_/ // //  |/ / / __   / /   / __/ / /| | / / / / __/ / /_/ /\__ \ 
 / _, _/ /_/ / ___ |/ _, _// // /|  / /_/ /  / /___/ /___/ ___ |/ /_/ / /___/ _, _/___/ / 
/_/ |_|\____/_/  |_/_/ |_/___/_/ |_/\____/  /_____/_____/_/  |_/_____/_____/_/ |_|/____/  
                                                                                          

I see you nerd! ⌐⊙_⊙
*/

contract RoaringLeaders is ERC721, ERC721Enumerable, ERC721Burnable, Ownable {
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;

    uint256 public maxTokenSupply;

    uint256 public constant MAX_MINTS_PER_TXN = 15;

    uint256 public mintPrice = 0.065 ether;

    uint256 public maxPresaleMintsPerWallet = 4;

    bool public preSaleIsActive = false;

    bool public saleIsActive = false;

    string public baseURI;

    string public provenance;

    uint256 public startingIndexBlock;

    uint256 public startingIndex;

    address public elixirContractAddress;

    mapping (address => uint256) private _presaleMints;

    address[3] private _shareholders;

    uint[3] private _shares;

    event PaymentReleased(address to, uint256 amount);

    constructor(string memory name, string memory symbol, uint256 maxRoaringLeadersSupply) ERC721(name, symbol) {
        maxTokenSupply = maxRoaringLeadersSupply;

        _shareholders[0] = 0xDc8Eb8d2D1babD956136b57B0B9F49b433c019e3; // Treasure-Seeker
        _shareholders[1] = 0x653C7C5d8B14e0b2b261Ed1FCfd652EEA0496376; // Nerd_Minter
        _shareholders[2] = 0x0313B09E8Ee8A0932dBEb76c4D7c46055969C7C4; // Carlos

        _shares[0] = 3500;
        _shares[1] = 4600;
        _shares[2] = 1900;
    }

    function setMaxTokenSupply(uint256 maxRoaringLeadersSupply) public onlyOwner {
        maxTokenSupply = maxRoaringLeadersSupply;
    }

    function setMintPrice(uint256 newPrice) public onlyOwner {
        mintPrice = newPrice;
    }

    function setMaxPresaleMintsPerWallet(uint256 newLimit) public onlyOwner {
        maxPresaleMintsPerWallet = newLimit;
    }

    function setElixirContractAddress(address newElixirContractAddress) public onlyOwner {
        elixirContractAddress = newElixirContractAddress;
    }

    function withdrawForGiveaway(uint256 amount, address payable to) public onlyOwner {
        Address.sendValue(to, amount);
        emit PaymentReleased(to, amount);
    }

    function withdraw(uint256 amount) public onlyOwner {
        require(address(this).balance >= amount, "Insufficient balance");
        
        uint256 totalShares = 10000;
        for (uint256 i = 0; i < 3; i++) {
            uint256 payment = amount * _shares[i] / totalShares;

            Address.sendValue(payable(_shareholders[i]), payment);
            emit PaymentReleased(_shareholders[i], payment);
        }
    }

    /*
    * Mint reserved NFTs for giveaways, devs, etc.
    */
    function reserveMint(uint256 reservedAmount, address mintAddress) public onlyOwner {        
        uint256 supply = _tokenIdCounter.current();
        for (uint256 i = 1; i <= reservedAmount; i++) {
            _safeMint(mintAddress, supply + i);
            _tokenIdCounter.increment();
        }
    }

    /*
    * Pause sale if active, make active if paused.
    */
    function flipSaleState() public onlyOwner {
        saleIsActive = !saleIsActive;
    }

    /*
    * Pause pre-sale if active, make active if paused.
    */
    function flipPreSaleState() public onlyOwner {
        preSaleIsActive = !preSaleIsActive;
    }

    /*
    * Mint Roaring Leaders NFTs, woot!
    */
    function mintLeaders(uint256 numberOfTokens) public payable {
        require(saleIsActive, "Sale is not live yet");
        require(numberOfTokens <= MAX_MINTS_PER_TXN, "You can mint a max of 15 RL NFTs at a time");
        require(totalSupply() + numberOfTokens <= maxTokenSupply, "Purchase would exceed max available NFTs");
        require(mintPrice * numberOfTokens <= msg.value, "Ether value sent is not correct");

        for(uint256 i = 0; i < numberOfTokens; i++) {
            uint256 mintIndex = _tokenIdCounter.current() + 1;
            if (mintIndex <= maxTokenSupply) {
                _tokenIdCounter.increment();
                _safeMint(msg.sender, mintIndex);
            }
        }
    }

    /*
    * Mint Roaring Leaders NFTs during pre-sale
    */
    function presaleMint(uint256 numberOfTokens) public payable {
        require(preSaleIsActive, "Pre-sale is not live yet");
        require(_presaleMints[msg.sender] + numberOfTokens <= maxPresaleMintsPerWallet, "Max mints per wallet limit exceeded");
        require(totalSupply() + numberOfTokens <= maxTokenSupply, "Purchase would exceed max available NFTs");
        require(mintPrice * numberOfTokens <= msg.value, "Ether value sent is not correct");

        _presaleMints[msg.sender] += numberOfTokens;

        for(uint256 i = 0; i < numberOfTokens; i++) {
            uint256 mintIndex = _tokenIdCounter.current() + 1;
            if (mintIndex <= maxTokenSupply) {
                _tokenIdCounter.increment();
                _safeMint(msg.sender, mintIndex);
            }
        }

        // If we haven't set the starting index, set the starting index block.
        if (startingIndexBlock == 0) {
            startingIndexBlock = block.number;
        }
    }

    function burnForElixir(uint256 tokenId) external {
        require(_isApprovedOrOwner(tx.origin, tokenId) && msg.sender == elixirContractAddress, "Caller is not owner nor approved");
        _burn(tokenId);
    }

    function walletOfOwner(address _owner) external view returns (uint256[] memory) {
        uint256 tokenCount = balanceOf(_owner);

        uint256[] memory tokenIds = new uint256[](tokenCount);
        for (uint256 i = 0; i < tokenCount; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
        }

        return tokenIds;
    }

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

    function setBaseURI(string memory newBaseURI) public onlyOwner {
        baseURI = newBaseURI;
    }

    /**
     * Set the starting index for the collection.
     */
    function setStartingIndex() public onlyOwner {
        require(startingIndex == 0, "Starting index is already set");
        require(startingIndexBlock != 0, "Starting index block must be set");
        
        startingIndex = uint(blockhash(startingIndexBlock)) % maxTokenSupply;
        // Just a sanity case in the worst case if this function is called late (EVM only stores last 256 block hashes).
        if (block.number - startingIndexBlock > 255) {
            startingIndex = uint(blockhash(block.number - 1)) % maxTokenSupply;
        }
        // Prevent default sequence.
        if (startingIndex == 0) {
            startingIndex = 1;
        }
    }

    /**
     * Set the starting index block for the collection. Usually, this will be set after the first sale mint.
     */
    function emergencySetStartingIndexBlock() public onlyOwner {
        require(startingIndex == 0, "Starting index is already set");
        
        startingIndexBlock = block.number;
    }

    /*     
    * Set provenance once it's calculated.
    */
    function setProvenanceHash(string memory provenanceHash) public onlyOwner {
        provenance = provenanceHash;
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721, ERC721Enumerable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC721Enumerable) returns (bool) {
        return super.supportsInterface(interfaceId);
    }
}

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

pragma solidity ^0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

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

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

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

File 3 of 15 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping (uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping (address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC721).interfaceId
            || interfaceId == type(IERC721Metadata).interfaceId
            || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0
            ? string(abi.encodePacked(baseURI, tokenId.toString()))
            : '';
    }

    /**
     * @dev Base URI for computing {tokenURI}. Empty by default, can be overriden
     * in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);
    }

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

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}

File 4 of 15 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

File 5 of 15 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

File 6 of 15 : ERC721Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "../../../utils/Context.sol";

/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be irreversibly burned (destroyed).
 */
abstract contract ERC721Burnable is Context, ERC721 {
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
        _burn(tokenId);
    }
}

File 7 of 15 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId
            || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 8 of 15 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 9 of 15 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

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

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

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

File 10 of 15 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

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

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

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

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

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

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

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

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

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

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

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

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

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

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

File 11 of 15 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 12 of 15 : Counters.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

File 13 of 15 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

}

File 14 of 15 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

File 15 of 15 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

Contract Security Audit

Contract ABI

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}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"reservedAmount","type":"uint256"},{"internalType":"address","name":"mintAddress","type":"address"}],"name":"reserveMint","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":[],"name":"saleIsActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","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"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newElixirContractAddress","type":"address"}],"name":"setElixirContractAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newLimit","type":"uint256"}],"name":"setMaxPresaleMintsPerWallet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"maxRoaringLeadersSupply","type":"uint256"}],"name":"setMaxTokenSupply","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newPrice","type":"uint256"}],"name":"setMintPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"provenanceHash","type":"string"}],"name":"setProvenanceHash","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"setStartingIndex","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startingIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startingIndexBlock","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":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"walletOfOwner","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address payable","name":"to","type":"address"}],"name":"withdrawForGiveaway","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000002710000000000000000000000000000000000000000000000000000000000000000e526f6172696e674c6561646572730000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004524f415200000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : name (string): RoaringLeaders
Arg [1] : symbol (string): ROAR
Arg [2] : maxRoaringLeadersSupply (uint256): 10000

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000002710
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [4] : 526f6172696e674c656164657273000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [6] : 524f415200000000000000000000000000000000000000000000000000000000


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.