Contract 0xfa90d5d5ff08d9a06c9fdf89b4b22217b9dbc418

 
 
Txn Hash
Block
From
To
Value [Txn Fee]
0xf8fe946feb3863389e04f8d8b4017cb2aa895793cdfcbf500bf648c7c6578e1294337782021-07-24 9:51:1221 mins ago0x522efa2c0b35ca863ff2a4ab6e10d434b68a6ff8 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x6fb8aa682b82f8975964f2c5b1012ca16b699d63ef58917f7bd9d04c13f1886f94337072021-07-24 9:47:3924 mins ago0x0e788bbe31132d7ff54b318cda79e17230f47f54 IN  NiubiSwap: NIU Token0 BNB0.000267018
0xc0f29dc47fd3f4f0d7118f06f7cd66102da395d0197e093300144be20c7b822c94337052021-07-24 9:47:3324 mins ago0x652307bb9f6ee77ab432166dbed95cac2019ec62 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x16de644d0314156c78e35cb9f2244a2cd1c8198ab9a94bebaa3ffc97d22540af94336102021-07-24 9:42:4829 mins ago0x34b9c76a4ba5bc09343c8667ad61594a08905e9a IN  NiubiSwap: NIU Token0 BNB0.000222515
0x1348d7170a8a9da6cdeca44bfb0fae379675759e15cf5d384dfdbd2491a182fa94334372021-07-24 9:34:0938 mins ago0xdf0bda1f47cd4c2600180be2e8e381879a094c38 IN  NiubiSwap: NIU Token0 BNB0.000267018
0x5b848fc0290de7a3d37c0c36f66a2e88f1a60861fbb48ef727808de0da019cbb94333942021-07-24 9:31:5640 mins ago0x05a48b7ff49c6183f0ec71acbf45664e9f55bcd7 IN  NiubiSwap: NIU Token0 BNB0.000222515
0xa8f7311396a51772d4ebe23865235f01815fabcb46cf4119ea9819e97b9a5a2194331012021-07-24 9:17:1455 mins ago0xaa96d4656db04d541c304f687e1060299417aab5 IN  NiubiSwap: NIU Token0 BNB0.000222515
0xfc4f1c35575f69f8eef6bbf6fc6792ad7fd7bec2303658a3f3d848cb4b79415594330542021-07-24 9:14:5357 mins ago0xc33840907548f240f2884380f8f387355d975391 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x79a0aa5b74bd7ec6457f3d86852dd66b5e6265df913c96d1c3712325049f158594329632021-07-24 9:10:201 hr 2 mins ago0x2007e5a743c52a7fcac6ffdc2f70f6b9d50b65d5 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x86f4dc07154de1bb383d12af6138cd1fb6cd60aa0190d9601b1cd76bce2cf12894324762021-07-24 8:45:451 hr 26 mins ago0x7b95360e41179cd82974f93fe24d161425d3da7d IN  NiubiSwap: NIU Token0 BNB0.000222515
0x2016abb72e10f768d81117f44cced1378d2498c2415a124d7e9f2beedf8ca8c894323362021-07-24 8:38:441 hr 33 mins ago0x20286f9e1c976a3de8c0736bbe488913c0bc1445 IN  NiubiSwap: NIU Token0 BNB0.000267018
0xe811a291593fa3e5806e4da175fd7814603993ae80382f3de8209a4fa3bb3ac394315832021-07-24 8:00:312 hrs 11 mins ago0xc9e9fc022de62f73fab472e17ac52cc65368a943 IN  NiubiSwap: NIU Token0 BNB0.000222515
0xe02b5138e52ca92bcfe3afb25bc4767d935dad6dd6057494738b25aa0ce591bf94314062021-07-24 7:51:402 hrs 20 mins ago0x374587528c78c277ee2ae06b6471f3f440186cb2 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x723f1bfdee83c26a81aa731e5479712e7ff0a9fefb06a6d34d544b008f866a8f94313432021-07-24 7:48:312 hrs 23 mins ago0x2d357078722fc6821db5994cc192c2740aa6a051 IN  NiubiSwap: NIU Token0 BNB0.000267018
0x29c57fdc567171595f1413174afcaeb6ac09bb71ad449303dfdc42c5578b886394311752021-07-24 7:39:562 hrs 32 mins ago0x97d6ccf9f3bc802feea9bb2dbe70a289472fbcf3 IN  NiubiSwap: NIU Token0 BNB0.000222515
0xeb6929c91f0e779ac13cdb552504fe084d308834971d993dcd11c8cdf964671394310622021-07-24 7:33:372 hrs 38 mins ago0x071a841a02e58b538ba01c1e58ec9f637dee0203 IN  NiubiSwap: NIU Token0 BNB0.000222515
0xe11a1d61626c0f9b69dbd1d151815a0dd42a2d46b184e8830ec6b318470e6a1f94309442021-07-24 7:27:262 hrs 44 mins ago0x8bb5c1aaecf706edb67b97232b99da928ff5d384 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x580cf3c8faea9a2212058d30b29b8a22a1b83c5a00215b39aae2d3d1b7c727ab94308572021-07-24 7:22:452 hrs 49 mins ago0x2b6ed6e57efd8534e2f4abb3e7ba03b585088106 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x66fee44190808332b1eaca5f040c56d66434f820383cab1771bd934100e6603294308472021-07-24 7:22:132 hrs 50 mins ago0x682f9bbd75a3cd120f8dc694b7cd5e71a00a3112 IN  NiubiSwap: NIU Token0 BNB0.000222515
0xb4d4f8775cad7e615ec0dbb8ab87e3f44ede6369edd07dbdd695b85f8f70549894307472021-07-24 7:17:132 hrs 55 mins ago0x25759fe7143fd1fbc18a1618e8e2186d586b0a57 IN  NiubiSwap: NIU Token0 BNB0.000126515
0xde4cdd0466e9efe6d79f7f508b76b2ed246ff62dc36ff87ab8b4c7a5fa7e554f94307442021-07-24 7:17:042 hrs 55 mins ago0x25759fe7143fd1fbc18a1618e8e2186d586b0a57 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x2b6f3b7100dcb4a53c0eab4a407c5d8556454aeb5fa2315aad7aa42d012d566c94304552021-07-24 7:02:353 hrs 9 mins ago0x50014994d42cc18c78af38716e37433214f6f525 IN  NiubiSwap: NIU Token0 BNB0.000222515
0xd67020f4a1b272d8ce36d78f81c4fadb7d80d18487b0689feea04293a6f3753b94303322021-07-24 6:56:233 hrs 16 mins ago0x4c5c251106944a30b07b0923ae98160f6dcf5e10 IN  NiubiSwap: NIU Token0 BNB0.000222515
0x2844d1b4620c8e4115dc4096ddd368c3fc2dcdfc722585995c8903d4ee046adb94301422021-07-24 6:46:193 hrs 26 mins ago0x4ac967c9fa55572978db2a98681082f9dd42e3dd IN  NiubiSwap: NIU Token0 BNB0.000222515
0x0140661bdab46aa91493573203bc886913bba7e94efc51ebb6f516a24edf4ebb94301232021-07-24 6:45:113 hrs 27 mins ago0x2799e614d956c943d8ffe74e62ba58369e2ca072 IN  NiubiSwap: NIU Token0 BNB0.000222515
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OVERVIEW

Niubiswap is a decentralized exchange (DEX) and features a native governance token called NIU that is fully community distributed and is capable of trading all tokens issued on Ethereum (ERC-20) and Binance Smart Chain.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xd38825c8449e4f2111c735c8df6bb092623c5da3231df870abdb8288d662bd3a54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xd38825c8449e4f2111c735c8df6bb092623c5da3231df870abdb8288d662bd3a54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xd38825c8449e4f2111c735c8df6bb092623c5da3231df870abdb8288d662bd3a54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xd38825c8449e4f2111c735c8df6bb092623c5da3231df870abdb8288d662bd3a54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xffe03bd585383c2abb8210cd40b5f78caad001a1f7115aae9a1576b44f7dd49854713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xffe03bd585383c2abb8210cd40b5f78caad001a1f7115aae9a1576b44f7dd49854713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xffe03bd585383c2abb8210cd40b5f78caad001a1f7115aae9a1576b44f7dd49854713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xffe03bd585383c2abb8210cd40b5f78caad001a1f7115aae9a1576b44f7dd49854713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xde198af1ad24809d05733427ceb30775342b14e9d8001667b7968aa85d159b0554713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xde198af1ad24809d05733427ceb30775342b14e9d8001667b7968aa85d159b0554713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xde198af1ad24809d05733427ceb30775342b14e9d8001667b7968aa85d159b0554713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xde198af1ad24809d05733427ceb30775342b14e9d8001667b7968aa85d159b0554713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xde198af1ad24809d05733427ceb30775342b14e9d8001667b7968aa85d159b0554713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x67b264fc8226e7b110f2cc849e3beb64fb54badfad93adf683cf6034fb6f6c4654713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x67b264fc8226e7b110f2cc849e3beb64fb54badfad93adf683cf6034fb6f6c4654713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x67b264fc8226e7b110f2cc849e3beb64fb54badfad93adf683cf6034fb6f6c4654713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x67b264fc8226e7b110f2cc849e3beb64fb54badfad93adf683cf6034fb6f6c4654713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xcec4d580b3b9990598e12ad51f8a1ff367c3dce38d3cfebbb8a22ceb0e51860d54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xcec4d580b3b9990598e12ad51f8a1ff367c3dce38d3cfebbb8a22ceb0e51860d54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xcec4d580b3b9990598e12ad51f8a1ff367c3dce38d3cfebbb8a22ceb0e51860d54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0xcec4d580b3b9990598e12ad51f8a1ff367c3dce38d3cfebbb8a22ceb0e51860d54713352021-03-07 11:59:42138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x1faf13fa9f48265996493545d19523a6a7e3b06da6e833454ca39d900045782654713342021-03-07 11:59:39138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x1faf13fa9f48265996493545d19523a6a7e3b06da6e833454ca39d900045782654713342021-03-07 11:59:39138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x1faf13fa9f48265996493545d19523a6a7e3b06da6e833454ca39d900045782654713342021-03-07 11:59:39138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
0x1faf13fa9f48265996493545d19523a6a7e3b06da6e833454ca39d900045782654713342021-03-07 11:59:39138 days 22 hrs ago 0xd53105e8efee1461d8c103d7ba979561d2fb4abe NiubiSwap: NIU Token0 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
NiubiToken

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-03-06
*/

// File: node_modules\@openzeppelin\contracts\utils\Context.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with 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


pragma solidity >=0.6.0 <0.8.0;

/**
 * @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.
 */
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 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\GSN\Context.sol


pragma solidity >=0.6.0 <0.8.0;

// File: contracts\libs\IBEP20.sol

pragma solidity >=0.6.4;

interface IBEP20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the token decimals.
     */
    function decimals() external view returns (uint8);

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

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

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external view returns (address);

    /**
     * @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\math\SafeMath.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, 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;
    }
}

// File: contracts\libs\BEP20.sol


pragma solidity >=0.4.0;





/**
 * @dev Implementation of the {IBEP20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {BEP20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-BEP20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of BEP20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IBEP20-approve}.
 */
contract BEP20 is Context, IBEP20, Ownable {
    using SafeMath for uint256;

    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external override view returns (address) {
        return owner();
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public override view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public override view returns (string memory) {
        return _symbol;
    }

    /**
    * @dev Returns the number of decimals used to get its user representation.
    */
    function decimals() public override view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {BEP20-totalSupply}.
     */
    function totalSupply() public override view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {BEP20-balanceOf}.
     */
    function balanceOf(address account) public override view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {BEP20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {BEP20-allowance}.
     */
    function allowance(address owner, address spender) public override view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {BEP20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {BEP20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {BEP20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom (address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(amount, 'BEP20: transfer amount exceeds allowance')
        );
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {BEP20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {BEP20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, 'BEP20: decreased allowance below zero'));
        return true;
    }

    /**
     * @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
     * the total supply.
     *
     * Requirements
     *
     * - `msg.sender` must be the token owner
     */
    function mint(uint256 amount) public onlyOwner returns (bool) {
        _mint(_msgSender(), amount);
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer (address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), 'BEP20: transfer from the zero address');
        require(recipient != address(0), 'BEP20: transfer to the zero address');

        _balances[sender] = _balances[sender].sub(amount, 'BEP20: transfer amount exceeds balance');
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), 'BEP20: mint to the zero address');

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), 'BEP20: burn from the zero address');

        _balances[account] = _balances[account].sub(amount, 'BEP20: burn amount exceeds balance');
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve (address owner, address spender, uint256 amount) internal {
        require(owner != address(0), 'BEP20: approve from the zero address');
        require(spender != address(0), 'BEP20: approve to the zero address');

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, 'BEP20: burn amount exceeds allowance'));
    }
}

// File: contracts\NiubiToken.sol

pragma solidity 0.6.12;


// NiubiToken with Governance.
contract NiubiToken is BEP20('Niubi Token', 'NIU') {
    /// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
    function mint(address _to, uint256 _amount) public onlyOwner {
        _mint(_to, _amount);
        _moveDelegates(address(0), _delegates[_to], _amount);
    }

    // Copied and modified from YAM code:
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernanceStorage.sol
    // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernance.sol
    // Which is copied and modified from COMPOUND:
    // https://github.com/compound-finance/compound-protocol/blob/master/contracts/Governance/Comp.sol

    /// @notice A record of each accounts delegate
    mapping (address => address) internal _delegates;

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }

    /// @notice A record of votes checkpoints for each account, by index
    mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping (address => uint32) public numCheckpoints;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    /// @notice A record of states for signing / validating signatures
    mapping (address => uint) public nonces;

      /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegator The address to get delegatee for
     */
    function delegates(address delegator)
        external
        view
        returns (address)
    {
        return _delegates[delegator];
    }

   /**
    * @notice Delegate votes from `msg.sender` to `delegatee`
    * @param delegatee The address to delegate votes to
    */
    function delegate(address delegatee) external {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint nonce,
        uint expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    )
        external
    {
        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name())),
                getChainId(),
                address(this)
            )
        );

        bytes32 structHash = keccak256(
            abi.encode(
                DELEGATION_TYPEHASH,
                delegatee,
                nonce,
                expiry
            )
        );

        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator,
                structHash
            )
        );

        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "NIU::delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "NIU::delegateBySig: invalid nonce");
        require(now <= expiry, "NIU::delegateBySig: signature expired");
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account)
        external
        view
        returns (uint256)
    {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber)
        external
        view
        returns (uint256)
    {
        require(blockNumber < block.number, "NIU::getPriorVotes: not yet determined");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee)
        internal
    {
        address currentDelegate = _delegates[delegator];
        uint256 delegatorBalance = balanceOf(delegator); // balance of underlying NIUs (not scaled);
        _delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                // decrease old representative
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint256 srcRepNew = srcRepOld.sub(amount);
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                // increase new representative
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint256 dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint256 oldVotes,
        uint256 newVotes
    )
        internal
    {
        uint32 blockNumber = safe32(block.number, "NIU::_writeCheckpoint: block number exceeds 32 bits");

        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function getChainId() internal pure returns (uint) {
        uint256 chainId;
        assembly { chainId := chainid() }
        return chainId;
    }
}

Contract ABI

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":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"numCheckpoints","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","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":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://868f7e30ea4f85823c1dc9f90c37413a7643d3c1f2d2ed23e22beff63167f8ea
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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