Contract 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 2

 

Contract Overview

Balance:
0 BNB

BNB Value:
$0.00

Token:
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x35089551aa14defacb7cd1bdda402f4bd75cfc4f09d1ed0b9c24b806d9a5bed3Ready To Sell To...109036142021-09-14 9:46:133 days 15 hrs ago0x2d2541f56bdce07fc46d00c7a7112e211aacc023 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.00015614
0x596a3e7ae4c5b6a5374080729fe7eeec12276c6b69bee72bd7fa7c7c1b714101Ready To Sell To...103688382021-08-26 15:09:3122 days 9 hrs ago0xe5360169a65e59a1a19a2800c5404fac495b234e IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.00015608
0x1b309c4a8ec3c78029655d752dad3e05e726d492a3eda0608db527ca31fe509aCancel Sell Toke...83050592021-06-15 1:19:3194 days 23 hrs ago0x005b09c3150d873ee317b8ce62460b3772cf3945 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498395
0x2302ef04a69dbc3d0fcacbb77f1a7801435956483ca2151a8f66a40597e2adedCancel Sell Toke...80922672021-06-07 14:56:35102 days 9 hrs ago0x2b83f654b3aa613d91a49fc323ebf8edc5592734 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498365
0xf91d802d5907eaea07cddbc6e4dcc4b924e39f4f310881ea6180d3b3595468d3Cancel Sell Toke...80922592021-06-07 14:56:11102 days 9 hrs ago0x2b83f654b3aa613d91a49fc323ebf8edc5592734 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000556865
0x69493722f9af5a7e8bb94f0173cc10e7f9043d349182033e9b1468c09054d592Transfer Ownersh...72925822021-05-10 8:31:49130 days 16 hrs agoBakerySwap: Deployer IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.0001574778
0x706651570a9dc3ef8a5752a0364e55524792ea534cd5f3f1cb466e8729fb7535Transfer Fee Add...72917402021-05-10 7:45:52130 days 17 hrs agoBakerySwap: Deployer IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.00015028
0xd3feb03ead10521b88db92c9ab7914edb9aed4c4c0178ac7f7b8af4e61d23ed6Cancel Sell Toke...70713282021-05-02 11:30:43138 days 13 hrs ago0x731476cc26aa8c93622f00b8cf4ba1789f83fc14 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498395
0x7f818c01b36f8faa543853dc0111a254febc60565fc4b12c3653f0f2b1510d86Cancel Sell Toke...70712762021-05-02 11:28:07138 days 13 hrs ago0x8246df4cc1eb58038a98c2c27c2300e0264ce796 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498395
0x2df2b8a6aa50126a55ac26cc5020ffc9a662db9cca6dee14ab823048bec8d3f6Cancel Sell Toke...70213352021-04-30 17:38:19140 days 7 hrs ago0xc47dec7ffde829043b91e904fdaf1e048bdd482c IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000535865
0x3c0ce9cd6c71bf7752281ab6604d560247f571173782337e362219c027a5ce5bCancel Sell Toke...70212642021-04-30 17:34:46140 days 7 hrs ago0xc47dec7ffde829043b91e904fdaf1e048bdd482c IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000519365
0xbc4390473c96e547d6efd396f60accc128bd67b47deaeff5024090f00f52dc48Cancel Sell Toke...70212412021-04-30 17:33:37140 days 7 hrs ago0xc47dec7ffde829043b91e904fdaf1e048bdd482c IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498365
0x71dafdfd3437b3d91fcadd3717721f61ebe3db57f5b68d76411403ef8b462b84Cancel Sell Toke...70212292021-04-30 17:33:01140 days 7 hrs ago0xc47dec7ffde829043b91e904fdaf1e048bdd482c IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000556865
0x01646715ebccaebac4d043d92d9a542e61097fc37e9e543c9dc7978c38805993Cancel Sell Toke...69894922021-04-29 14:30:12141 days 10 hrs ago0xc47dec7ffde829043b91e904fdaf1e048bdd482c IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000556865
0x013f5f61c7f8bf014b15c85e0ef03520c729a84ada11a2df8d2a3dd9f6f15cb0Cancel Sell Toke...69892902021-04-29 14:20:06141 days 10 hrs ago0xa64e821d6bf7b5d4f0ec43147702519fffc9cc6f IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498365
0xb33ee1df294e51c722eff7fdeee628cc2ba3c8325125fb045abcd4ab594b7d77Cancel Sell Toke...69841622021-04-29 10:02:27141 days 14 hrs ago0xf953a6921958b1687aac4896dd6be956243715c3 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000525395
0x44683c58c0a20c89ca59f90034627905c72adede259b087af7cb443c5390c44fCancel Sell Toke...69751352021-04-29 2:28:08141 days 22 hrs ago0xd06a56e1ca79fd6cab8b7491b5f096c1beb7e6aa IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000118035
0xd46678ea5c9ce839a74d5b7fd7358e9b665eab84d54b3d567e5c1e7c513e66f8Cancel Sell Toke...69751102021-04-29 2:26:53141 days 22 hrs ago0xd06a56e1ca79fd6cab8b7491b5f096c1beb7e6aa IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498395
0x304c40d8becf355b8236eb314a5b18798c4b25f5816b350f0ef4e086f86bc57dCancel Sell Toke...69751022021-04-29 2:26:29141 days 22 hrs ago0xd06a56e1ca79fd6cab8b7491b5f096c1beb7e6aa IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000519365
0x383996257a09b21ae9e5e7f60276aaaeb6d3493afb3dd76f65b825e3c534768dCancel Sell Toke...69431482021-04-27 23:42:20143 days 1 hr ago0x82499b9b16f282a028e8a5416e2ad7d7f3f9be97 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000535865
0x7cf3ee58e809b49dd30cb5f44f8d3407828eb6af25b8f9868e1ecedc7ec585f4Buy Token68402792021-04-24 9:24:33146 days 15 hrs ago0xa17c34a19f7dd3e64688261b253f46717120a9e4 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.00065783
0x0709634c6ebd9659d414a870d2075cc135a040ea43da16317ae9b44696141686Buy Token68170512021-04-23 14:01:12147 days 10 hrs ago0x648361696f4075e15d4be0b9dfd31bc130782596 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.00065783
0x81a88feb99576f72486b49ffd3a7a46895a5a9d680b9c4a0ce888c260e662e5bCancel Sell Toke...67946622021-04-22 18:51:44148 days 6 hrs ago0x35fe72c52b75b3ad76a653600f3ac265a130d571 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000598074
0x10b6fc5306710b67dc83ff869a83090722922b8a4b34aecb3bc8bd7f148167e6Cancel Sell Toke...67251732021-04-20 7:50:48150 days 17 hrs ago0xc47dec7ffde829043b91e904fdaf1e048bdd482c IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000519395
0x7f27dc91b1fb71ea143613a4904f6de2345ee704b604fa10aad65b4f8e0b58a8Cancel Sell Toke...66399152021-04-17 8:34:44153 days 16 hrs ago0x9fa3e689fe66530a14725cacdd7392a51732c671 IN  0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e8140 BNB0.000498395
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Latest 18 internal transactions
Parent Txn Hash Block From To Value
0xd41575339d27322c5d1726f105fb772685ec778e0814f40b21c1ed2fd546d6e854479412021-03-06 16:28:30195 days 8 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 BakerySwap: BAKE Token0 BNB
0xd41575339d27322c5d1726f105fb772685ec778e0814f40b21c1ed2fd546d6e854479412021-03-06 16:28:30195 days 8 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x6241dbcb465e00644377c99e1ea0e88d76aa2942cf0d751187d0477583fd246453884862021-03-04 14:55:33197 days 9 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0xd94a845943070fedb7a3a5fb0d6dd6c595f38ea0ccf49b9afea32a46d9f499d453884712021-03-04 14:54:48197 days 9 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0xb28572615e3d8c7f43972d1b1c5aa212c1c5ea14f4f1eecea965b39900390ad453884582021-03-04 14:54:09197 days 9 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x118fd960d84f389ac0c5e0202b1f41bae43c84bc48c9881ebd202e8b1f209e8653884472021-03-04 14:53:36197 days 9 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0xc5b1e600520c326411775efa7dd807d5e6e26e8d497907ce8f4cda271b26365553884392021-03-04 14:53:12197 days 9 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x8e73104154eb55c6664c8755a086ac0c0297919b81d8a2377927860efb7cd1f553884172021-03-04 14:52:06197 days 9 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x52bf2e0d62a087ff9de2f249b44bacedbbc1f4e4f1d525943392831aeb25013353883952021-03-04 14:51:00197 days 10 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0xe86c62d8310a71d1c59df184e4e28d4cf8a73d4a4ff60ffc1905fd3e5d0f203a53883842021-03-04 14:50:27197 days 10 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x9c1fbd379166bcbed7abb5b0fe888b42c50ba63b33187fc73631627dae9eb3bd53843102021-03-04 11:26:45197 days 13 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x23fdc54de872dd7ddc7cb3c2b16b01a30688cac2681cfeda4a49a3e98dd9bdff53827222021-03-04 10:07:21197 days 14 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x7223cfba651270f9e54fcaaaabbe0cde6db141440383866ba3bfac0d84feb56053827102021-03-04 10:06:45197 days 14 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x0d3609ddd158efbd2d2192d3703767d94e9cc07391306bd09533b878a2a372b953688052021-03-03 22:30:49198 days 2 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0xe96deacbc97997c1d6196cfea957492204c1e9241a958dfab0bd70ed27ebc6d253347032021-03-02 16:43:19199 days 8 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x8a2bbe86ef05b4b058134040db3728aa9dcb0446d3f17f695af6f60101b0eced53345722021-03-02 16:36:46199 days 8 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0xf5761f0511db8a61cfc9a15402e5a5712e08d5086d9c65574c15bb62b9f34ddf53288882021-03-02 11:52:13199 days 12 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
0x03dc137cca896492f8b56960f25529d3f63715cf1794e299cc593a3e9aefc29c53288842021-03-02 11:52:01199 days 12 hrs ago 0x26b82ab8269b2ad48fbdbbc9a08c78df7d68e814 0x5bc94e9347f3b9be8415bdfd24af16666704e44f0 BNB
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xa4c3a8f8465fddde98a440f8cf5e180e6e33f644

Contract Name:
ExchangeNFT

Compiler Version
v0.6.6+commit.6c089d02

Optimization Enabled:
Yes with 999999 runs

Other Settings:
istanbul EvmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2020-12-01
*/

// File: @openzeppelin/contracts/math/SafeMath.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/math/Math.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/Address.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @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 in 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");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        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: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/introspection/IERC165.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;


/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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: @openzeppelin/contracts/token/ERC721/ERC721Holder.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;


  /**
   * @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: @openzeppelin/contracts/utils/Pausable.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;


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

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

    bool private _paused;

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

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

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

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

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

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

// File: @openzeppelin/contracts/utils/EnumerableSet.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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 v3.0.0, only sets of type `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];
    }

    // 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(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(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(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(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));
    }
}

// File: contracts/libraries/EnumerableMap.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0;

/**
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/EnumerableMap.sol
 */
library EnumerableMap {
    struct MapEntry {
        uint256 _key;
        uint256 _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(uint256 => 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,
        uint256 key,
        uint256 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, uint256 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, uint256 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 (uint256, uint256) {
        require(map._entries.length > index, 'EnumerableMap: index out of bounds');

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

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, uint256 key) private view returns (uint256) {
        return _get(map, key, 'EnumerableMap: nonexistent key');
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     */
    function _get(
        Map storage map,
        uint256 key,
        string memory errorMessage
    ) private view returns (uint256) {
        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
    }

    // UintToUintMap

    struct UintToUintMap {
        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(
        UintToUintMap storage map,
        uint256 key,
        uint256 value
    ) internal returns (bool) {
        return _set(map._inner, key, 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(UintToUintMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, key);
    }

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

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

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

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(
        UintToUintMap storage map,
        uint256 key,
        string memory errorMessage
    ) internal view returns (uint256) {
        return _get(map._inner, key, errorMessage);
    }
}

// File: contracts/interfaces/IExchangeNFT.sol

pragma solidity >=0.6.2;

interface IExchangeNFT {
    function buyToken(uint256 _tokenId) external;

    function buyTokenTo(uint256 _tokenId, address _to) external;

    function setCurrentPrice(uint256 _tokenId, uint256 _price) external;

    function readyToSellToken(uint256 _tokenId, uint256 _price) external;

    function readyToSellTokenTo(
        uint256 _tokenId,
        uint256 _price,
        address _to
    ) external;

    function cancelSellToken(uint256 _tokenId) external;
}

// File: contracts/ExchangeNFT.sol

pragma solidity =0.6.6;
pragma experimental ABIEncoderV2;












contract ExchangeNFT is IExchangeNFT, ERC721Holder, Ownable, Pausable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using Address for address;
    using EnumerableMap for EnumerableMap.UintToUintMap;
    using EnumerableSet for EnumerableSet.UintSet;

    struct AskEntry {
        uint256 tokenId;
        uint256 price;
    }

    IERC721 public nft;
    IERC20 public quoteErc20;
    address public feeAddr;
    uint256 public feePercent;
    EnumerableMap.UintToUintMap private _asksMap;
    mapping(uint256 => address) private _tokenSellers;
    mapping(address => EnumerableSet.UintSet) private _userSellingTokens;

    event Trade(address indexed seller, address indexed buyer, uint256 indexed tokenId, uint256 price);
    event Ask(address indexed seller, uint256 indexed tokenId, uint256 price);
    event CancelSellToken(address indexed seller, uint256 indexed tokenId);
    event FeeAddressTransferred(address indexed previousOwner, address indexed newOwner);
    event SetFeePercent(address indexed seller, uint256 oldFeePercent, uint256 newFeePercent);

    constructor(
        address _nftAddress,
        address _quoteErc20Address,
        address _feeAddr,
        uint256 _feePercent
    ) public {
        require(_nftAddress != address(0) && _nftAddress != address(this));
        require(_quoteErc20Address != address(0) && _quoteErc20Address != address(this));
        nft = IERC721(_nftAddress);
        quoteErc20 = IERC20(_quoteErc20Address);
        feeAddr = _feeAddr;
        feePercent = _feePercent;
        emit FeeAddressTransferred(address(0), feeAddr);
        emit SetFeePercent(_msgSender(), 0, feePercent);
    }

    function buyToken(uint256 _tokenId) public override whenNotPaused {
        buyTokenTo(_tokenId, _msgSender());
    }

    function buyTokenTo(uint256 _tokenId, address _to) public override whenNotPaused {
        require(_msgSender() != address(0) && _msgSender() != address(this), 'Wrong msg sender');
        require(_asksMap.contains(_tokenId), 'Token not in sell book');
        nft.safeTransferFrom(address(this), _to, _tokenId);
        uint256 price = _asksMap.get(_tokenId);
        uint256 feeAmount = price.mul(feePercent).div(100);
        if (feeAmount != 0) {
            quoteErc20.safeTransferFrom(_msgSender(), feeAddr, feeAmount);
        }
        quoteErc20.safeTransferFrom(_msgSender(), _tokenSellers[_tokenId], price.sub(feeAmount));
        _asksMap.remove(_tokenId);
        _userSellingTokens[_tokenSellers[_tokenId]].remove(_tokenId);
        emit Trade(_tokenSellers[_tokenId], _to, _tokenId, price);
        delete _tokenSellers[_tokenId];
    }

    function setCurrentPrice(uint256 _tokenId, uint256 _price) public override whenNotPaused {
        require(_userSellingTokens[_msgSender()].contains(_tokenId), 'Only Seller can update price');
        require(_price != 0, 'Price must be granter than zero');
        _asksMap.set(_tokenId, _price);
        emit Ask(_msgSender(), _tokenId, _price);
    }

    function readyToSellToken(uint256 _tokenId, uint256 _price) public override whenNotPaused {
        emit Ask(_msgSender(), _tokenId, _price);
        readyToSellTokenTo(_tokenId, _price, address(_msgSender()));
    }

    function readyToSellTokenTo(
        uint256 _tokenId,
        uint256 _price,
        address _to
    ) public override whenNotPaused {
        require(_msgSender() == nft.ownerOf(_tokenId), 'Only Token Owner can sell token');
        require(_price != 0, 'Price must be granter than zero');
        nft.safeTransferFrom(address(_msgSender()), address(this), _tokenId);
        _asksMap.set(_tokenId, _price);
        _tokenSellers[_tokenId] = _to;
        _userSellingTokens[_to].add(_tokenId);
        emit Ask(_to, _tokenId, _price);
    }

    function cancelSellToken(uint256 _tokenId) public override whenNotPaused {
        require(_userSellingTokens[_msgSender()].contains(_tokenId), 'Only Seller can cancel sell token');
        nft.safeTransferFrom(address(this), _msgSender(), _tokenId);
        _asksMap.remove(_tokenId);
        _userSellingTokens[_tokenSellers[_tokenId]].remove(_tokenId);
        delete _tokenSellers[_tokenId];
        emit CancelSellToken(_msgSender(), _tokenId);
    }

    function getAskLength() public view returns (uint256) {
        return _asksMap.length();
    }

    function getAsks() public view returns (AskEntry[] memory) {
        AskEntry[] memory asks = new AskEntry[](_asksMap.length());
        for (uint256 i = 0; i < _asksMap.length(); ++i) {
            (uint256 tokenId, uint256 price) = _asksMap.at(i);
            asks[i] = AskEntry({tokenId: tokenId, price: price});
        }
        return asks;
    }

    function getAsksDesc() public view returns (AskEntry[] memory) {
        AskEntry[] memory asks = new AskEntry[](_asksMap.length());
        if (_asksMap.length() > 0) {
            for (uint256 i = _asksMap.length() - 1; i > 0; --i) {
                (uint256 tokenId, uint256 price) = _asksMap.at(i);
                asks[_asksMap.length() - 1 - i] = AskEntry({tokenId: tokenId, price: price});
            }
            (uint256 tokenId, uint256 price) = _asksMap.at(0);
            asks[_asksMap.length() - 1] = AskEntry({tokenId: tokenId, price: price});
        }
        return asks;
    }

    function getAsksByPage(uint256 page, uint256 size) public view returns (AskEntry[] memory) {
        if (_asksMap.length() > 0) {
            uint256 from = page == 0 ? 0 : (page - 1) * size;
            uint256 to = Math.min((page == 0 ? 1 : page) * size, _asksMap.length());
            AskEntry[] memory asks = new AskEntry[]((to - from));
            for (uint256 i = 0; from < to; ++i) {
                (uint256 tokenId, uint256 price) = _asksMap.at(from);
                asks[i] = AskEntry({tokenId: tokenId, price: price});
                ++from;
            }
            return asks;
        } else {
            return new AskEntry[](0);
        }
    }

    function getAsksByPageDesc(uint256 page, uint256 size) public view returns (AskEntry[] memory) {
        if (_asksMap.length() > 0) {
            uint256 from = _asksMap.length() - 1 - (page == 0 ? 0 : (page - 1) * size);
            uint256 to = _asksMap.length() - 1 - Math.min((page == 0 ? 1 : page) * size - 1, _asksMap.length() - 1);
            uint256 resultSize = from - to + 1;
            AskEntry[] memory asks = new AskEntry[](resultSize);
            if (to == 0) {
                for (uint256 i = 0; from > to; ++i) {
                    (uint256 tokenId, uint256 price) = _asksMap.at(from);
                    asks[i] = AskEntry({tokenId: tokenId, price: price});
                    --from;
                }
                (uint256 tokenId, uint256 price) = _asksMap.at(0);
                asks[resultSize - 1] = AskEntry({tokenId: tokenId, price: price});
            } else {
                for (uint256 i = 0; from >= to; ++i) {
                    (uint256 tokenId, uint256 price) = _asksMap.at(from);
                    asks[i] = AskEntry({tokenId: tokenId, price: price});
                    --from;
                }
            }
            return asks;
        }
        return new AskEntry[](0);
    }

    function getAsksByUser(address user) public view returns (AskEntry[] memory) {
        AskEntry[] memory asks = new AskEntry[](_userSellingTokens[user].length());
        for (uint256 i = 0; i < _userSellingTokens[user].length(); ++i) {
            uint256 tokenId = _userSellingTokens[user].at(i);
            uint256 price = _asksMap.get(tokenId);
            asks[i] = AskEntry({tokenId: tokenId, price: price});
        }
        return asks;
    }

    function getAsksByUserDesc(address user) public view returns (AskEntry[] memory) {
        AskEntry[] memory asks = new AskEntry[](_userSellingTokens[user].length());
        if (_userSellingTokens[user].length() > 0) {
            for (uint256 i = _userSellingTokens[user].length() - 1; i > 0; --i) {
                uint256 tokenId = _userSellingTokens[user].at(i);
                uint256 price = _asksMap.get(tokenId);
                asks[_userSellingTokens[user].length() - 1 - i] = AskEntry({tokenId: tokenId, price: price});
            }
            uint256 tokenId = _userSellingTokens[user].at(0);
            uint256 price = _asksMap.get(tokenId);
            asks[_userSellingTokens[user].length() - 1] = AskEntry({tokenId: tokenId, price: price});
        }
        return asks;
    }

    function pause() public onlyOwner whenNotPaused {
        _pause();
    }

    function unpause() public onlyOwner whenPaused {
        _unpause();
    }

    function transferFeeAddress(address _feeAddr) public {
        require(_msgSender() == feeAddr, 'FORBIDDEN');
        feeAddr = _feeAddr;
        emit FeeAddressTransferred(_msgSender(), feeAddr);
    }

    function setFeePercent(uint256 _feePercent) public onlyOwner {
        require(feePercent != _feePercent, 'Not need update');
        emit SetFeePercent(_msgSender(), feePercent, _feePercent);
        feePercent = _feePercent;
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_nftAddress","type":"address"},{"internalType":"address","name":"_quoteErc20Address","type":"address"},{"internalType":"address","name":"_feeAddr","type":"address"},{"internalType":"uint256","name":"_feePercent","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"seller","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"}],"name":"Ask","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"seller","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"CancelSellToken","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"FeeAddressTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"seller","type":"address"},{"indexed":false,"internalType":"uint256","name":"oldFeePercent","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newFeePercent","type":"uint256"}],"name":"SetFeePercent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"seller","type":"address"},{"indexed":true,"internalType":"address","name":"buyer","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"}],"name":"Trade","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"buyToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"address","name":"_to","type":"address"}],"name":"buyTokenTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"cancelSellToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"feeAddr","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feePercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAskLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAsks","outputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct ExchangeNFT.AskEntry[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"page","type":"uint256"},{"internalType":"uint256","name":"size","type":"uint256"}],"name":"getAsksByPage","outputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct ExchangeNFT.AskEntry[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"page","type":"uint256"},{"internalType":"uint256","name":"size","type":"uint256"}],"name":"getAsksByPageDesc","outputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct ExchangeNFT.AskEntry[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getAsksByUser","outputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct ExchangeNFT.AskEntry[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getAsksByUserDesc","outputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct ExchangeNFT.AskEntry[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAsksDesc","outputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"}],"internalType":"struct ExchangeNFT.AskEntry[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nft","outputs":[{"internalType":"contract IERC721","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC721Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"quoteErc20","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"readyToSellToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint256","name":"_price","type":"uint256"},{"internalType":"address","name":"_to","type":"address"}],"name":"readyToSellTokenTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"setCurrentPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_feePercent","type":"uint256"}],"name":"setFeePercent","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_feeAddr","type":"address"}],"name":"transferFeeAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://8fd2b631278f070c9b6d2953f26b5bf06d1d354185358e9e879d8de97971ef80
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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