Contract 0x6EF9f05A4Eb8B7D7d89E916f6eF77547ae6aC10c 2

 

Contract Overview

BonaRobotics: BROB Token
Balance:
0.22793 BNB

BNB Value:
$105.77 (@ $464.06/BNB)

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xdf6b18b70e613087554dc01b2cb8dad7d7bb15483d8095ad07e499756e462dafSet Approval For...143454022022-01-14 1:43:365 days 3 hrs ago0xa45ad21c7b3ca7990c7215945db741cc8d0af3db IN  BonaRobotics: BROB Token0 BNB0.000225395
0xa5385d5212e09fda7d00d915b11f84de75eeb982bf34e11640eed6e520400322Set Approval For...142213272022-01-09 18:07:579 days 10 hrs ago0x2275644c8e9b647e3dbb47b29896c6861520bb0b IN  BonaRobotics: BROB Token0 BNB0.000225395
0x8e813c709f8edfcd5772ba70451560ea4e8b950997ca6c2e6ca3aa71c145db3fSet Approval For...141928602022-01-08 18:23:3510 days 10 hrs ago0xa3d4a2fc2c6327fef4b95f0436498c5309763db3 IN  BonaRobotics: BROB Token0 BNB0.000225395
0xe3ed0b42c9ce3ea143bdede5abd578dfdc50c73a999e891fba9433486fdd3bc6Set Approval For...141808572022-01-08 8:21:5510 days 20 hrs ago0x5589e5e0a3c9dec765c56f942ffe8d663dbfbd4b IN  BonaRobotics: BROB Token0 BNB0.000225395
0xc7b3b345fb068d1e21e19bc3d3f45f17c7b5a9caec3c2065c221e566b3ccf741Set Approval For...140798182022-01-04 19:57:0514 days 9 hrs ago0x21c9d69566418cee88e9f0c36c4b3ba086b9a80d IN  BonaRobotics: BROB Token0 BNB0.000225395
0xa4f24d1dee9f85b0dfdc7990de08134566f6666e4479d009a405d0e6f7db560dSet Approval For...139526292021-12-31 9:47:0318 days 19 hrs ago0x427eb0fcb24d0da5387897449de4c61aad5d4931 IN  BonaRobotics: BROB Token0 BNB0.000129395
0xb42541d1049bd2d20f4f4bad6a45f5f33bc7ae45cecd48dfe5127f3535f2db86Set Approval For...139526002021-12-31 9:45:3618 days 19 hrs ago0x427eb0fcb24d0da5387897449de4c61aad5d4931 IN  BonaRobotics: BROB Token0 BNB0.000225395
0x241b81ba979cdc7987561592fa7b5f2a34958e8c6e521510bffc6cc633cae339Set Approval For...139043312021-12-29 17:30:5720 days 11 hrs ago0x208e9442b2829615559161b91c8353e09d46c8c3 IN  BonaRobotics: BROB Token0 BNB0.000225395
0xa90860899628a44807d413718e61ca25643c46e142c312acd8a357135e704833Transfer From138753582021-12-28 17:21:2321 days 11 hrs ago0x46a74b17cd023286b4e3bb8571f38c61a3ebba5a IN  BonaRobotics: BROB Token0 BNB0.000325595
0x67005b793c37a5c8583572ef8601f4abb0ad90bec268317b9cb2119ffec20b96Set Approval For...138218442021-12-26 20:40:2723 days 8 hrs ago0x8babe58666a2470db992f0d4cbd6b38fa8fcdfdf IN  BonaRobotics: BROB Token0 BNB0.000225395
0xdc4872552b3a0fcadb954630c18914f12e9a928d3542ec850d7bbc61f0b86124Transfer138203692021-12-26 19:26:3523 days 9 hrs ago0x08533afc6f839ddcea6a85ee243e519c644abcf1 IN  BonaRobotics: BROB Token0.00991 BNB0.0007886
0xa648a0165f443cbb9c00a3aabcf2aa49b7ba2fc15bfc828463b74be1ae01e44dSet Approval For...138188212021-12-26 18:09:1123 days 10 hrs ago0x46a74b17cd023286b4e3bb8571f38c61a3ebba5a IN  BonaRobotics: BROB Token0 BNB0.000225395
0x54f174929eef0963b7cfa37a9000bba2a16fed182eb11ea774a44dffa44e1c3dTransfer From138183282021-12-26 17:44:2923 days 11 hrs ago0x46a74b17cd023286b4e3bb8571f38c61a3ebba5a IN  BonaRobotics: BROB Token0 BNB0.000325595
0xa8e1aa4ef2d82fcc42c2490c4eff29ed56ccb4eaceb1d766c60264f67bb009ebSet Approval For...138100052021-12-26 10:47:2423 days 18 hrs ago0x1cbcc97dd8f71eabec85f8ee0b8816e4014966ec IN  BonaRobotics: BROB Token0 BNB0.000225395
0xaf424da4b15adb431eac7a4a0a163853a9435f6155664a158b8d7d3be3b106b2Transfer137942492021-12-25 21:38:3224 days 7 hrs ago0x23cbae3816ca303581719a927d89b25948b9734f IN  BonaRobotics: BROB Token0.00991 BNB0.0007886
0xdd78fa4db99352252d9930d2fcd858fbc3865a1fe4bc7a8a46db5fbd36048ad3Set Approval For...137621272021-12-24 18:51:0425 days 10 hrs ago0x8ee31245c4226d6afba084360da52bf1692fd9f1 IN  BonaRobotics: BROB Token0 BNB0.000225395
0x6ccc78f4dd6f697f68ce2f5ac724213a27b26dd6398ace1ce1c7db9604481bb2Set Approval For...136982182021-12-22 13:31:4327 days 15 hrs ago0x626eb58cd44401ee1dd51c5037a5a5a2a11abb80 IN  BonaRobotics: BROB Token0 BNB0.000225395
0x1c11c26f1632ae11ba03a6c8a2126e48357cdd610cfe593f2343afca0e58d1a1Approve136427552021-12-20 14:39:3929 days 14 hrs ago0x47bf0dae6e92e49a3c95e5b0c71422891d5cd4fe IN  BonaRobotics: BROB Token0 BNB0.00023452
0xea4c723dbf9864fa8fae0da233d44099a85c05b307425615ac7d9759c54c2d69Set Approval For...136418082021-12-20 13:52:0129 days 15 hrs ago0xfd3fd99314c2188f6bcc7d34be97ed0f445727a7 IN  BonaRobotics: BROB Token0 BNB0.000225395
0xa1f006e0bf4da19c369392f70b9620430fec58560a83e1467e7b8aba7e75101bSet Approval For...136099182021-12-19 11:17:0530 days 17 hrs ago0x69e38cb9632b71da3955e84b6181c347e4aa51e9 IN  BonaRobotics: BROB Token0 BNB0.000225395
0x4ca0620b5e730821cb4433842f9d80f24d38a8cb30db8208b5dbdba46eab490cSet Approval For...135592602021-12-17 17:01:3332 days 11 hrs ago0x881a0c01f4b9a243c59b070c89edc3ce0107d75e IN  BonaRobotics: BROB Token0 BNB0.000225395
0xc5a6c89fbe0cd545b8d96c889b6dbe7e2a8929eb4072d1e46ed82672a1f96892Set Approval For...135050662021-12-15 19:42:2334 days 9 hrs ago0xf627cb124c0d7d5afa3d4a658bae11a9e5e87a4a IN  BonaRobotics: BROB Token0 BNB0.000225395
0xf90d2f0e2365600b7d3996b24f41e43e9cf88dc9c48b8cb8c722d9e702c2cd13Set Approval For...134857082021-12-15 3:28:4935 days 1 hr ago0x808710ed193290526f4db637038291a7f58edccf IN  BonaRobotics: BROB Token0 BNB0.000225395
0x22c8b6494cf5bdb5006c8e1776715779ff9d612e8d05a664258e58f817b14e43Safe Transfer Fr...134738142021-12-14 17:32:4435 days 11 hrs ago0xc1ca0cd3fa710ca92f426d25f856ef8e97bba1a2 IN  BonaRobotics: BROB Token0 BNB0.00033044
0x30ecdcc540d3ec8da946fa6fb3dfe0666529294c234251cc2264b55552a06bfaSet Approval For...134695392021-12-14 13:56:4835 days 15 hrs ago0x0372961a990a4a0bf1fc93c90e035afe4444a499 IN  BonaRobotics: BROB Token0 BNB0.000225395
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OVERVIEW

BonaRobotics is a collectible NFT platform based on Binance Smart Chain blockchain with a limit of 1 million unique, randomly generated robots. The NFTs were created using an algorithm that differentiates patterns to achieve random appearances, attributes, and characteristics.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x2fcfe9785c2667ffda4abb3f2f0894447c470166bb49dddc929b414c28be0f3c124991352021-11-09 9:44:5570 days 19 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.85226 BNB
0xef05571a32f2025506d1c21a0441c6d7b735c73424ac4e0d059a1179ba57c269122240972021-10-30 16:01:4480 days 12 hrs ago BonaRobotics: BROB Token0x48122d8fa6d9f24dd27906e4221b8d1bee16e0064.19193 BNB
0x6dd076cb306b9c937cdd739c8e72e5cdafcb6ec680efb5130dfa176da81922b2114875592021-10-04 19:35:51106 days 9 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer9.68207 BNB
0x68550f88b2760bafc1c57c9955cb83c8b81eefd2510d14f29a32fc932322b4c1109592962021-09-16 8:19:32124 days 20 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer6.29285 BNB
0x3a869dec7a6f7db8066361c42c1d127b2c20bc9389ab3d1c6942052d3ece6dba108442832021-09-12 8:14:39128 days 20 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer3.62706 BNB
0x6d0c94e4ef03541b4e1d618a0edfa768b569e65c217c49eff9cee9f7d2013dff107407182021-09-08 17:04:27132 days 11 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer1.74416 BNB
0x9a355a76326ec5a4f9eaf4577376ff01e81bd4c413b477f46c82dccac15c0f74107000012021-09-07 6:33:27133 days 22 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.57478 BNB
0xd4c75527b2502243545e6dfece75bdc366ec32aa9685757c4e375d0efd7621b4106703952021-09-06 5:37:44134 days 23 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.3964 BNB
0x8e862f491e75a6f5cdeafe225786f6934089e5fe5a7bfe04eab74655a1be4887106235772021-09-04 14:27:33136 days 14 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.34685 BNB
0xd16bb5eca4bb0dbed5d674cdd87628831b61fefc0527f1a6de5fe5b86f5680be106165402021-09-04 8:35:41136 days 20 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.2973 BNB
0xef6a184827b4d163aef33564f0b38aff253e89ef99bad6bd6998527842f17878105679002021-09-02 15:38:41138 days 13 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.37658 BNB
0x96ab72ccbd974ba09e0be83260ae29233d949cf86a0898fff1e71aa5f4f06782105307882021-09-01 8:20:14139 days 20 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.43604 BNB
0xf467f6eb9b0a00a0e0412cff0c2c18cef38626e2cf3a47a2ab16d8194ab26769104788372021-08-30 12:07:28141 days 16 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.4955 BNB
0xf12674b5df3c9311623c178d67328d4d612667474d533f0ebeb320a4ce33fa03102508782021-08-22 12:24:33149 days 16 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.40631 BNB
0x8e1b79eb49c759705d12d7eb4662ce86170e27822e1150d0f31697b8e1774541101441992021-08-18 18:49:50153 days 10 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.30721 BNB
0x6f759d2ba1906aab1130a5e5cdcf7401ccf99194ff26ac88e87c184a111e4b2e101302592021-08-18 7:11:36153 days 21 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.32703 BNB
0x935d7ef87bf5240ddbc6d4038d758802d012bc1213b1c76a539bd69c1b4ef173100840152021-08-16 16:34:41155 days 12 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.34685 BNB
0x9b25404464e05b5b834b9166e3599e60ad2aaea0e69fb842abfd775cba304f40100613232021-08-15 21:34:50156 days 7 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.3964 BNB
0x7f3e2dd0f87ca99ddac304a128bcd974632cafdedbde43e34b78c21aaab7c8ed100195282021-08-14 10:38:27157 days 18 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.44595 BNB
0xc78e15ebedf329dfc8de1a9d7ca8cda5c0a2d8cfd5468fc37d7876988f8be42499914442021-08-13 10:54:12158 days 18 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.47568 BNB
0x9948c8cbfe05b9963ecc2df585bc04ab37618d56ab700323202082c2bd3813cd99751902021-08-12 21:04:25159 days 7 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.35676 BNB
0x14682504d9032401f39314bb47543e0c60c312493e35c4e77aa7d44fea8d8dc499459642021-08-11 20:08:08160 days 8 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.40631 BNB
0x81a973f6878d21ce8b3c533f9acebf278689648059b0036aade5933b524c31aa97795092021-08-05 21:29:32166 days 7 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.11892 BNB
0x2557cdc6b9881fe6b266c8e59c98b566d047f1bd0c399e6260c83901c946cba697786942021-08-05 20:47:06166 days 8 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.18829 BNB
0x2734a42b4b40e57fa4ae777061a93c81c6088ce4e196f233304243e772224d5994037892021-07-23 8:41:05179 days 20 hrs ago BonaRobotics: BROB TokenBonaRobotics: Deployer0.71352 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
BonaRobotics

Compiler Version
v0.8.1+commit.df193b15

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity Multiple files format)

File 1 of 15: BonaRobotics.sol
pragma solidity ^0.8.1;

import "./ERC721URIStorage.sol";

contract BonaRobotics is ERC721URIStorage {
    uint8 public constant version = 1;
    address public OWNER1;
    address public owner2 = 0x48122D8Fa6D9F24DD27906e4221b8d1beE16e006;
    uint public SMART_CONTRACT_RELEASE_BY_UNIXTIME;
    uint32 public constant MAX_ROBOTS = 1000000;
    string public base_url = "https://ipfs.xonalabs.com/ipfs/";
    string public json_ipfs_id = "QmR8qCN66hDcsemNxAyN1L9rJqWwdx74SBrRRDdQBH6JfB";
    uint32 public robots_counter;
    address[] public free_phase_addresses;
    bool public project_paused = false;
    uint256 private FREE_CLAIM_10_DAYS_IN_SECONDS = 864000;
    uint256 public free_claim_end_timestamp;
    uint256 public phase1_fee = 0.000000000000000001 ether;
    uint256 public phase2_fee = 0.00991 ether;
    uint256 public phase3_fee = 0.0303 ether;


    constructor() ERC721("BonaRobotics", "BROB") {
        OWNER1 = msg.sender;
        SMART_CONTRACT_RELEASE_BY_UNIXTIME = block.timestamp;
        robots_counter = 0;
        free_claim_end_timestamp = FREE_CLAIM_10_DAYS_IN_SECONDS + SMART_CONTRACT_RELEASE_BY_UNIXTIME;
    }

    event SubscibePayments(
        uint32 indexed id,
        address indexed user,
        uint256 indexed date,
        uint256 amount
        
    );
    
    function totalSupply() public view returns (uint256) {
        return MAX_ROBOTS;
    }

    function contractURI() public view returns (string memory) {
        string memory url = string(abi.encodePacked(base_url, json_ipfs_id, "/",  "about", ".json"));
        return url; // should redirect or return the about.json
    }

    function create_robot() internal returns (uint32) {
        robots_counter++;
        uint32 new_item_id = robots_counter;
        string memory tokenuri = string(abi.encodePacked(base_url, json_ipfs_id, "/",  uint2str(new_item_id), ".json"));
        _safeMint(msg.sender, new_item_id);
        _setTokenURI(new_item_id, tokenuri);
        
        return new_item_id;
    }

    function change_OWNER2(address _newaddr) public is_owner {
        owner2 = _newaddr;
    }

    function change_BASE_URL(string memory _url) public is_owner {
        base_url = _url;
    }

    function change_IPFS_ID(string memory _ipfsid) public is_owner {
        json_ipfs_id = _ipfsid;
    }

    function suspend_project(bool _param) public is_owner {
        project_paused = _param;
    }

    function get_balance() public view returns (uint) {
        return address(this).balance;
    }

    function append_free_phase_address(address addr) internal {
        free_phase_addresses.push(addr);
    }
    
    function check_if_address_included_in_free_phase(address addr) internal view returns (bool) {
        for (uint16 i; i<free_phase_addresses.length; i++) {
            if (free_phase_addresses[i] == addr) {
                return true;
            }
        }
        return false;
    }

    function change_PHASE1_FEE(uint256 _new) public is_owner {
        phase1_fee = _new;
    }
    
    function change_PHASE2_FEE(uint256 _new) public is_owner {
        phase2_fee = _new;
    }
    
    function change_PHASE3_FEE(uint256 _new) public is_owner {
        phase3_fee = _new;
    }

    function payout(address payable _addr) public is_owner {
        _addr.transfer(address(this).balance);
    }

    function check_the_mint_phase_fee() internal {
        if (robots_counter >= 0 && robots_counter < 10000 && free_claim_end_timestamp > block.timestamp) {
            require (msg.value >= phase1_fee, "The ether amount is not enough to buy a robot! Phase1 (FREE)");
            bool claim_status = check_if_address_included_in_free_phase(msg.sender);
            require (claim_status == false, "This address already minted a free robot! Phase1 (FREE)");
            append_free_phase_address(msg.sender);
        }
        else if (robots_counter >= 0 && robots_counter < 190000) {
            require (msg.value >= phase2_fee, "The ether amount is not enough to buy a robot! Phase2");
        }
        else if (robots_counter >= 190000 && robots_counter < MAX_ROBOTS) {
            require (msg.value >= phase3_fee, "The ether amount is not enough to buy a robot! Phase3");
        }
        else {
            require (msg.value >= 999 ether, "This statement will be never reached :)");
        }
    }

    function uint2str(uint _i) internal pure returns (string memory _uintAsString) {
            if (_i == 0) {
                return "0";
            }
            uint j = _i;
            uint len;
            while (j != 0) {
                len++;
                j /= 10;
            }
            bytes memory bstr = new bytes(len);
            uint k = len;
            while (_i != 0) {
                k = k-1;
                uint8 temp = (48 + uint8(_i - _i / 10 * 10));
                bytes1 b1 = bytes1(temp);
                bstr[k] = b1;
                _i /= 10;
            }
            return string(bstr);
        }

    receive() external
    pause_project
    check_if_max_robots_count_not_reached
    payable {
        check_the_mint_phase_fee();
        create_robot();
        emit SubscibePayments(robots_counter, msg.sender, block.timestamp, msg.value);
    }

    modifier check_if_max_robots_count_not_reached() {
        require(robots_counter < MAX_ROBOTS, "The XonaRobotics buy period ended! 1M robots count reached.");
        _;
    }

    modifier pause_project() {
        require (project_paused == false, "Project owners suspended the project, sorry for the inconvenience");
        _;
    }

    modifier is_owner() {
    require(msg.sender == OWNER1 || msg.sender == owner2, "Caller is not smart contract owner");
    _;
    }
}


File 2 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 3 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 4 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 5 of 15: ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./IERC721Enumerable.sol";
import "./ERC165.sol";
import "./Context.sol";
import "./Address.sol";
import "./Context.sol";
import "./Strings.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 6 of 15: ERC721Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ERC721.sol";
import "./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: ERC721Holder.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721Receiver.sol";

  /**
   * @dev Implementation of the {IERC721Receiver} interface.
   *
   * Accepts all token transfers.
   * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
   */
contract ERC721Holder is IERC721Receiver {

    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(address, address, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}


File 9 of 15: ERC721URIStorage.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ERC721.sol";

/**
 * @dev ERC721 token with storage based token URI management.
 */
abstract contract ERC721URIStorage is ERC721 {
    using Strings for uint256;

    // Optional mapping for token URIs
    mapping (uint256 => string) private _tokenURIs;

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721URIStorage: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = _baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }

        return super.tokenURI(tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @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 override {
        super._burn(tokenId);

        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}


File 10 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);
}

File 11 of 15: IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

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

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

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

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

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

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

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

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

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

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

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

File 12 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 13 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 14 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 15 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);
    }

}


Contract Security Audit

Contract ABI

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Swarm Source

ipfs://0c113a3607bd99391264ca3f2e98ac5e7076ae396e29442eaa5e5eca7a6b9891
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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