Contract 0xf70576a5255fccfe6551f3ec8de74c9e002e1a82 2

Contract Overview

Balance:
149.53101 AVAX

AVAX Value:
$2,135.30 (@ $14.28/AVAX)

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x1b709fbf9380754ca28a7cc06b3c3def76893c40eb3cb94576536148b6566181Safe Transfer Fr...231369442022-12-02 22:48:542 days 9 hrs ago0x00f9c16015425c8e0558b8f46c0816818f93c93f IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.002638742475.6
0x28f78a423bb10a8dbe6ea5ccb308715e0b1b68f87005befba1465d3e8d0667faSafe Transfer Fr...231369442022-12-02 22:48:542 days 9 hrs ago0x00f9c16015425c8e0558b8f46c0816818f93c93f IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.009637563675.6
0x53990157e5d0f3ee67bad82bb9b37054aed0c70b82c99cceace73e0c59c0cb5fSet Approval For...231075782022-12-02 6:11:293 days 2 hrs ago0x71164d7e34b9e0290e9ef77177d27e32e8beb711 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001227003 26.5
0xbda95d82193f6f095c82a888377b4d87365221ce8f3b982c6af337d9d8ea28c2Set Approval For...231075342022-12-02 6:10:003 days 2 hrs ago0x71164d7e34b9e0290e9ef77177d27e32e8beb711 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001227003 26.5
0x26093d53f12ff6128af441ab3cb97386b9bf80c2c6c6b045b99ed2296830a4f2Set Approval For...230556552022-12-01 0:36:154 days 8 hrs ago0x83923de4ea901cba9d157bef5496d9d0d356867e IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001266463879 27.35225
0xd47b4b4bfb245bd5c1eccf9ede31e2b080b7652ee32914ed61500cf52d0f7630Set Approval For...230072062022-11-29 21:13:135 days 11 hrs ago0x7c1faee5190e78b3470406ec0047a592efc8c7f5 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001244681103 26.8818
0x6b61ad818567a9e66ba6bddf5a090e2f93e3bffb9dbc9c0fdbeeee9ad475423bSet Approval For...229944352022-11-29 14:00:575 days 18 hrs ago0x696f637a5a5f9cc9795d9c597287571f3333e14f IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001227003 26.5
0xdb31b5c736b878ed8ac5ded2ca63b2da2a55b078fb810eceda89ad150c231780Set Approval For...229927852022-11-29 13:05:005 days 19 hrs ago0x307d1d37a7431881826b312b269f0364c4ba1b09 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001227003 26.5
0x8908ac03772e69fe89ae038919ee4fd82cf70552083a7b525c46dc46a0510f5bSet Approval For...229757602022-11-29 3:25:586 days 5 hrs ago0xc83378377d19572f6259891a98115775a47b0915 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001331182528.75
0xc391b97cbb473e5d3cf63b52a2da0a3c6cd23dfca75879a663bab08565ed3b08Set Approval For...228172002022-11-25 8:36:1310 days 11 mins ago0x2489ab62b165e07eb6ce347fd3aa61db347461fd IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001273305 27.5
0xf8822767ee612ad42902cca3fd4bc018fa6a135eac28ecb12fa9272c9ca5df03Set Approval For...227872962022-11-24 15:24:2510 days 17 hrs ago0xf5c3a2ab7251fe64ac0f5c60c60d4c1c64bda485 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001224777 26.5
0xfa6455d830655c2efd7864a2e191b8f948a91a7f58b35ec4b6dc019892d796a7Set Approval For...227520222022-11-23 19:13:5211 days 13 hrs ago0xdc0a17067af73e5035087872e6a95b0b248fb23d IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.00127330527.5
0x1beba7c2e7e9f94a22dc13c8d0eefe387a73e6175c9f63d81978b9b684654db3Set Approval For...227030472022-11-22 15:19:1512 days 17 hrs ago0xc77a55abb91e7cdeb810748cb1fbc5de8f36a7b7 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.000726055 27.5
0x413cf3e89d1fc559c23cc3b491960b420c5c731dafd93b7459d7562b7d895eadSet Approval For...227030462022-11-22 15:19:1312 days 17 hrs ago0xc77a55abb91e7cdeb810748cb1fbc5de8f36a7b7 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.000726055 27.5
0xb5600cdc9a9825fb5e59f57fd9daadc907f5797dc497eb8d04c1d618ee909b78Set Approval For...227030442022-11-22 15:19:0912 days 17 hrs ago0xc77a55abb91e7cdeb810748cb1fbc5de8f36a7b7 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.000726055 27.5
0xd55b8a32163a26a790181f14f8536ff0e610368e0c7f1402492cb046b63bb3d7Set Approval For...227030422022-11-22 15:19:0512 days 17 hrs ago0xc77a55abb91e7cdeb810748cb1fbc5de8f36a7b7 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001273305 27.5
0x551514c4640ee25609b34e4167a5a9403f1371443dd0724f1cf167a10409747eSet Approval For...226521432022-11-21 10:19:4213 days 22 hrs ago0x90066a4e89bedd9c1b6a1a5b73e633caa85e966c IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001227003 26.5
0x431438365cd325d57c8b3d94a603ee80e884f458d640ddefe7ae82a4ce5c1061Set Approval For...226519912022-11-21 10:14:2913 days 22 hrs ago0x90066a4e89bedd9c1b6a1a5b73e633caa85e966c IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001273305 27.5
0xb2ce2f04204d81338dec6d53f8a121ed53ba2c7b5c9751eff2c69c777da45e01Transfer From226458562022-11-21 6:46:1214 days 2 hrs ago0x7f70c7dc666b8d6a284beaba288c844a9a9a7248 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.002917439686 27.14478155
0x958e458e2ea43389e3d225ed67bbf58a8ea2be3d1db3cae55fb2e5aaa4237231Set Approval For...225764002022-11-19 14:35:3815 days 18 hrs ago0xab6a34a0a5fa7f3ea9841ffbe40b30c8a399c251 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001224777 26.5
0x847b4870c86ab65e6a9888e00fe3bfc624361ab56c92f97b85f70dc057cc80caSet Approval For...225759362022-11-19 14:19:2915 days 18 hrs ago0xab6a34a0a5fa7f3ea9841ffbe40b30c8a399c251 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001227950436 26.520462116
0xf56e6abdc8b0f6d27db157b7290e0dcf4729fdd1b3673c9cfe581e173417c71fSet Approval For...225447272022-11-18 19:56:1716 days 12 hrs ago0x2489ab62b165e07eb6ce347fd3aa61db347461fd IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001227003 26.5
0xf853548ca2b04c71900e98c3286e3b19f83a91df7f7de6a0479e62fb87caed00Set Approval For...225189302022-11-18 5:01:1217 days 3 hrs ago0x53b57f9e81d8c62e7ae7bbd31838c82959463752 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001239813841 26.825346
0x7b6d21dd8e41dfee7eb3d4ede7faa14f8fcc5d26e84a265d91bf955840965d2cSet Approval For...225146252022-11-18 2:24:3117 days 6 hrs ago0x1df1b2135f27cb7ab993c06e9d5b8416da62daa2 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.001254672422 27.146835064
0x8825c932caf649d656c32e86fd2b5798326120138867d52b37f86419eead189aSet Approval For...224804702022-11-17 6:35:0418 days 2 hrs ago0x24fb75dc981ff8a9ae4c2ed9b462122413d6aff7 IN  0xf70576a5255fccfe6551f3ec8de74c9e002e1a820 AVAX0.000706797001 26.77058562
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x505e1804f3a20342b74aa54181b19583499c03a066433f3d1a93c4cae68509f7174929402022-07-18 15:40:02139 days 17 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820xfe6e69e61319d91d8a37179cb513b5734791a0c03.8 AVAX
0x3363874bc61693d89828d74088832aab0c54127ba6c27d461da876828d6712c5153334542022-05-29 14:19:22189 days 18 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x021e8f878c20ede166a55228e7fcd2b5521eb4799.5 AVAX
0xdf220e907e7454b7304cca578d5d7921314fe45ea0476f6132ba46ede8b44f1392454392022-01-07 7:48:53332 days 58 mins ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x119460ecc4c538a02307e5d4f687bb83eddc5cf94.75 AVAX
0x651c16e3ddd7038e009928343f9f7b22abbcaf2058f3dccafaa0eee33e55122c85036912021-12-20 23:25:38349 days 9 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x2b8a5c254d776a90775a502fd97792ab334964613.8 AVAX
0x07ccf8032da22593bada15b309155153186623f00d4f76f2265dec1f42e50de482969782021-12-16 3:27:52354 days 5 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x933a29e0f9afaf7780d1a6af6f99c858983bb1ae2.28 AVAX
0x2977d0db531aaf2f7b60dddec39344f431c8cec9dee5d446d10166cb6f31d0bc78612962021-12-06 0:51:58364 days 7 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820xee650f5599bd48f27b29b254a4c45322a755c6b46.3555 AVAX
0x0b652206fa7db16a11c4ae70e02da8a5cbc63c66f8cab08f1e27f52d6e64ca1e76271692021-11-30 14:20:00369 days 18 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x135617c9fdc83ebcee69031053ce53225742eb8b2.375 AVAX
0x45ccedbca8ba3a88e36c94c3f4a3325670abbd66ba89a5d9ba953da5c5cf9f3273490782021-11-24 2:56:53376 days 5 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x32bd64c27d725f31b838cfa5b386de77434bdf0612.236 AVAX
0x5bae8384f7e7832a47b42f8d15850d7711e98c470ac6da435fd0394c947dc96c72770202021-11-22 10:44:16377 days 22 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x8b42d2b3fbf1b28935612d644357c2c56d58de303.42 AVAX
0xfdc2f32293704dad822f5024e85c35477ae28de9324acde584b55c14377ffe0772229662021-11-21 4:39:29379 days 4 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820xe9c6f6d44c546cdd54231e673ba8b612972cdd075.7 AVAX
0x8d873cdc274338650f26a709b6b57edfb89341c6444cce6ee45fc04c8594ef6071744112021-11-20 1:37:32380 days 7 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x6a936d26e64eae237d22defc0fcdab95a326b20f3.8 AVAX
0x950879e2acf66fa4c88e418da8f66c3902bc4035f15d92e0b420c5affe7a518570851092021-11-17 23:47:46382 days 8 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820xc1e549320f048d8149d5b0cb9cb268da59f1f2ad13.3 AVAX
0x4563f5e3b6c608b9d6bb9a6b5e21159d76911969249a086450ba00961bf38bb070229372021-11-16 13:08:52383 days 19 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x17b8d80fa181521ca3a736af901d079dcad40c922.85 AVAX
0x0159fb5c4ecd4a4eaae590801ad1b67043a6108e05dcb573578d9dfd65218b0b68584602021-11-12 16:49:02387 days 15 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820xa99b8111bd91e3fce42431ec32e621fe5a3f9bc411.4 AVAX
0xb16e4fe3cbc72651355efa833cbabdf154d317fc8f6731429c1286e9e35d4ef966700942021-11-08 6:16:34392 days 2 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x44e794f6e0e2691ab287a3144f1cc911d5a04b2012.255 AVAX
0x778ca444b2cc68129624016cee4238e14bed62637ac7b5a1471cac6bdc40a26e66553342021-11-07 21:56:23392 days 10 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x5f45d309014aa4289caf6a6905a677a2d2e8460b46.55 AVAX
0x28fa0614d0fa312d3b1bb677cdc8c003171a1e7498e1deb8f3e5a17be2246d8666553122021-11-07 21:55:36392 days 10 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820xb680f628c56c8fa368dacbb0c27beef8c98355b90.95 AVAX
0x05c75173195a6dd249db8296fccdfc916f7ae4d0067d05b1940f1fcd3c7b1b8266291022021-11-07 6:54:44393 days 1 hr ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x683c3ac15e4e024e1509505b9a8f3f7b1a1cff1e15.2 AVAX
0xdd3872620a8371aab0f90ddfc85c2f8e008ce07bc77d2c4d240da65cbb3b58dd65998962021-11-06 14:11:31393 days 18 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820xe626944dd329a748b5dac2fa9e2627e99d6cfdf04.75 AVAX
0x1c3ffb5be1d5f7ee5cdb96a7d71951c43a9fd2f4826f9a711e14522b25e2a02764304012021-11-02 13:38:00397 days 19 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x56b46c76fc49d348571bac149e2b26814ee7f66b3.6575 AVAX
0xf5459da43c33e06a31f472e80e6f33baf1546919dd2948faf3f32449a866791463727212021-11-01 5:06:59399 days 3 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x19c69aba3447cbf6c6c971b18f2e2cd55f8d2ce04.75 AVAX
0x50ba87ee8929ce71bff5dcee6c3e6141e073d4853e262b193aced9603552517763466212021-10-31 14:29:38399 days 18 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x8716b17503e5b9344a70668f89b390b312c713403.3725 AVAX
0xd0812fb9c500fd343b133626f59c85ec56cf8e3f46f8f863e7220383aa997a3663202442021-10-30 23:37:55400 days 9 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x87324877ab55f8a83fa48c9269a502ab454790b19.785 AVAX
0x7991b0736ce6c5bd4cf032f56e23d6b105052e1c142edcdc4714a142df1ca64463142572021-10-30 20:16:16400 days 12 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x03550e0207bf73beb7f834d2ae2490df128603170.1 AVAX
0x4885cd750347662f4bae0ae5b4a843d0b355c491a48d57889948cc64cc6cf8cd63142502021-10-30 20:16:02400 days 12 hrs ago 0xf70576a5255fccfe6551f3ec8de74c9e002e1a820x03550e0207bf73beb7f834d2ae2490df128603170.1 AVAX
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Contract Source Code Verified (Exact Match)

Contract Name:
ContractNft

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at snowtrace.io on 2021-11-21
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

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

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 () internal {
        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 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;
    }
}


/**
 * @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);
}


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}



/**
 * @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;
}

/**
 * @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);
}

/**
 * @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);
}

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    modifier onlyTradablePunk (address from, uint256 tokenId) {
        require(tokenId < 10000, "Out of tokenId");
        require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        _;
    }

    struct Offer {
        bool isForSale;
        uint256 punkIndex;
        address seller;
        uint256 minValue;       
        address onlySellTo;
    }
    struct Bid {
        bool hasBid;
        uint256 punkIndex;
        address bidder;
        uint256 value;
    }
    mapping(uint256 => uint256) private assignOrders;
    mapping (uint256 => Offer) public punksOfferedForSale;
    mapping (uint256 => Bid) public punkBids;
    mapping (address => uint256) public pendingWithdrawals;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from holder address to their (enumerable) set of owned tokens
    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

    // 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;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

    // Base URI
    string private _baseURI;

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

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

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @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 _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    /**
     * @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 _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));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(base, tokenId.toString()));
    }

    /**
    * @dev Returns the base URI set via {_setBaseURI}. This will be
    * automatically added as a prefix in {tokenURI} to each token's URI, or
    * to the token ID if no specific URI is set for that token ID.
    */
    function baseURI() public view virtual returns (string memory) {
        return _baseURI;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @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 || ERC721.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 _tokenOwners.contains(tokenId);
    }

    /**
     * @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 || ERC721.isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `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);

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(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); // internal owner

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

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

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

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(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"); // internal owner
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

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

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, 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), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @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()) {
            return true;
        }
        bytes memory returndata = to.functionCall(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ), "ERC721: transfer to non ERC721Receiver implementer");
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == _ERC721_RECEIVED);
    }

    function _approve(address to, uint256 tokenId) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId); // internal owner
    }

    /**
     * @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 { }
}

/**
 * @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);
}

/**
 * @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);
            }
        }
    }
}

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function _remove(Map storage map, bytes32 key) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function _contains(Map storage map, bytes32 key) private view returns (bool) {
        return map._indexes[key] != 0;
    }

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

   /**
    * @dev Returns the key-value pair stored at position `index` in the map. O(1).
    *
    * Note that there are no guarantees on the ordering of entries inside the
    * array, and it may change when more entries are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        uint256 keyIndex = map._indexes[key];
        if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
        return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

   /**
    * @dev Returns the element stored at position `index` in the set. O(1).
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint160(uint256(value))));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
        return (success, address(uint160(uint256(value))));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
    }
}

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` 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);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

contract ContractNft is ERC721, Ownable {

    using SafeMath for uint256;
    using Strings for uint256;

    mapping(uint256 => uint256) private assignOrders;

    uint256 public SALE_START_TIMESTAMP = 1628510022; // 1628535570

    uint256 public constant MAX_SUPPLY = 10000;
    uint256 public punksRemainingToAssign = 10000;

    uint256 public constant MAX_RESERVE = 100;
    uint256 public reserved = 0;

    string public constant imageHash = "4e295db0f87e342c73c9e9bb74e40d6e63a6d2cd5c27f1bfdc03b36429a04a94";

    constructor(string memory name, string memory symbol, string memory baseURI) ERC721(name, symbol) {
        _setBaseURI(baseURI);
    }

    function reserveNFTs(uint256 amount) onlyOwner public {
        require(SafeMath.add(totalSupply(), amount) <= MAX_SUPPLY, "Exceeds maximum supply. Please try to mint less Nfts.");
        require(reserved.add(amount) <= MAX_RESERVE, "Exceeds maximum reserve. Please try to mint less Nfts.");

        for (uint i = 0; i < amount; i++) {
            uint mintIndex = totalSupply();
            _safeMint(msg.sender, mintIndex);
        }
        reserved += amount;
    }

    function setSaleTimestamp(uint256 new_SALE_START_TIMESTAMP) onlyOwner public {
        SALE_START_TIMESTAMP = new_SALE_START_TIMESTAMP;
    }

    function getNFTPrice(uint256 amount) public view returns (uint256) {
        require(totalSupply() < MAX_SUPPLY, "Sale has already ended.");

        return amount.mul(2 ether);
    }

    function _random() internal view returns(uint256) {
        return uint256(
            keccak256(
                abi.encodePacked(block.timestamp + block.difficulty + ((uint256(keccak256(abi.encodePacked(block.coinbase)))) / block.timestamp) + block.gaslimit + ((uint256(keccak256(abi.encodePacked(_msgSender())))) / block.timestamp) + block.number)
            )
        ) / punksRemainingToAssign;
    }

    function _fillAssignOrder(uint256 orderA, uint256 orderB) internal returns(uint256) {
        uint256 temp = orderA;
        if (assignOrders[orderA] > 0) temp = assignOrders[orderA];
        assignOrders[orderA] = orderB;
        if (assignOrders[orderB] > 0) assignOrders[orderA] = assignOrders[orderB];
        assignOrders[orderB] = temp;
        return assignOrders[orderA];
    }

    function mintNFT(uint256 amount) public payable {
        // require(block.timestamp >= SALE_START_TIMESTAMP, "Sale has not started yet.");
        require(totalSupply() < MAX_SUPPLY, "Sale has already ended.");
        require(amount > 0, "You cannot mint 0 Nfts.");
        require(amount <= 20, "You cannot mint more than 20 Nfts per once");
        require(SafeMath.add(totalSupply(), amount) <= MAX_SUPPLY, "Exceeds maximum supply. Please try to mint less Nfts.");
        require(getNFTPrice(amount) == msg.value, "Amount of Ether sent is not correct.");

        (bool success,) = owner().call{value: msg.value}("");
        require(success);

        for (uint i = 0; i < amount; i++) {
            uint256 randIndex = _random() % punksRemainingToAssign;
            uint256 punkIndex = _fillAssignOrder(--punksRemainingToAssign, randIndex);
            _safeMint(msg.sender, punkIndex);
        }
    }

    function buyPunk(uint256 tokenId) payable public {
        Offer memory offer = punksOfferedForSale[tokenId];
        require(tokenId < 10000, "Out of tokenId");
        require(offer.isForSale, "No Sale");
        require(offer.onlySellTo == address(0) || offer.onlySellTo == _msgSender(), "Unable to sell");
        require(msg.value >= offer.minValue, "Insufficient amount");
        require(ownerOf(tokenId) == offer.seller, "Not seller");
        address seller = offer.seller;
        // Transfer the NFT
        _safeTransfer(seller, _msgSender(), tokenId, "");
        pendingWithdrawals[seller] += msg.value * 95 / 100;
        // handle
        (bool success,) = owner().call{value: msg.value * 5 / 100}("");
        require(success);
        // handle
        // emit PunkBought(tokenId, msg.value, seller, _msgSender());
    }

    function punkNoLongerForSale(uint256 tokenId) public {
        _punkNoLongerForSale(_msgSender(), tokenId);
    }

    function _punkNoLongerForSale(address from, uint256 tokenId) internal onlyTradablePunk(from, tokenId) {
        punksOfferedForSale[tokenId] = Offer(false, tokenId, from, 0, address(0));
        // emit PunkNoLongerForSale(tokenId);
    }

    function offerPunkForSale(uint256 tokenId, uint256 minSalePriceInWei) public onlyTradablePunk(_msgSender(), tokenId) {
        punksOfferedForSale[tokenId] = Offer(true, tokenId, _msgSender(), minSalePriceInWei, address(0));
        // emit PunkOffered(tokenId, minSalePriceInWei, address(0));
    }

    function enterBidForPunk(uint256 tokenId) public payable {
        require(tokenId < 10000, "Out");
        require(ownerOf(tokenId) != _msgSender(), "Invalid");
        require(msg.value > punkBids[tokenId].value, "Invalid");
        Bid memory existing = punkBids[tokenId];
        if (existing.value > 0) {
            // Refund the failing bid
            pendingWithdrawals[existing.bidder] += existing.value;
        }
        punkBids[tokenId] = Bid(true, tokenId, _msgSender(), msg.value);
        // emit PunkBidEntered(tokenId, msg.value, _msgSender());
    }

    function acceptBidForPunk(uint256 tokenId, uint256 minPrice) public onlyTradablePunk(_msgSender(), tokenId) {
        require(punkBids[tokenId].value >= minPrice, "Invalid");
        Bid memory bid = punkBids[tokenId];

        punkBids[tokenId] = Bid(false, tokenId, address(0), 0);
        _safeTransfer(_msgSender(), bid.bidder, tokenId, "");

        pendingWithdrawals[_msgSender()] += bid.value * 95 / 100;
        (bool success,) = owner().call{value: bid.value * 5 / 100}("");
        require(success);
        
        // emit PunkBought(tokenId, bid.value, _msgSender(), bid.bidder);
    }

    function withdrawBidForPunk(uint256 tokenId) public {
        require(tokenId < 10000, "Out");
        require(ownerOf(tokenId) != _msgSender(), "Invalid");
        require(punkBids[tokenId].bidder == _msgSender(), "Invalid");
        punkBids[tokenId] = Bid(false, tokenId, address(0), 0);
        // Refund the bid money
        (bool success,) = _msgSender().call{value: punkBids[tokenId].value}("");
        require(success);
        // emit PunkBidWithdrawn(tokenId, punkBids[tokenId].value, _msgSender());
    }

    
    function withdraw() public {
        uint256 amount = pendingWithdrawals[_msgSender()];
        pendingWithdrawals[_msgSender()] = 0;
        (bool success,) = _msgSender().call{value: amount}("");
        require(success);
    }

    function withdraw(uint256 amount) onlyOwner public {
        msg.sender.transfer(amount);
    }

    function changeBaseURI(string memory baseURI) onlyOwner public {
       _setBaseURI(baseURI);
    }

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

        return string(abi.encodePacked(baseURI(), tokenId.toString()));
    }
}

Contract ABI

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ool","name":"hasBid","type":"bool"},{"internalType":"uint256","name":"punkIndex","type":"uint256"},{"internalType":"address","name":"bidder","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"punkNoLongerForSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"punksOfferedForSale","outputs":[{"internalType":"bool","name":"isForSale","type":"bool"},{"internalType":"uint256","name":"punkIndex","type":"uint256"},{"internalType":"address","name":"seller","type":"address"},{"internalType":"uint256","name":"minValue","type":"uint256"},{"internalType":"address","name":"onlySellTo","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"punksRemainingToAssign","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"reserveNFTs","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"reserved","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":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"new_SALE_START_TIMESTAMP","type":"uint256"}],"name":"setSaleTimestamp","outputs":[],"stateMutability":"nonpayable","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":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"withdrawBidForPunk","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000000a415641582050554e4b5300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000450554e4b00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002068747470733a2f2f6170692e6176617870756e6b732e636f6d2f70756e6b732f

-----Decoded View---------------
Arg [0] : name (string): AVAX PUNKS
Arg [1] : symbol (string): PUNK
Arg [2] : baseURI (string): https://api.avaxpunks.com/punks/

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [4] : 415641582050554e4b5300000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [6] : 50554e4b00000000000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [8] : 68747470733a2f2f6170692e6176617870756e6b732e636f6d2f70756e6b732f


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://906e3571327917a172b6188bee1b9da65b32998b5af26467b6b1d32554ae879c
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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