Contract 0x2057c8ecb70afd7bee667d76b4cd373a325b1a20

 
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0x02e7c5f70590407d133f7f06cfddadc422c2350d6e7e54cfedacc93c207c5ac422634552021-09-24 12:39:566 mins ago0xc76e855a0ff531117f9929a88e40e3d36432e30c IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915460.015
0xb4ba96fa648e009f2e6c7fdd30f7e5436dfa189676c1e27138dcc6025df1131022630312021-09-24 12:28:2018 mins ago0xcc5a3f4b53e69c3ae91b105c524c79b773e32196 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915460.015
0x37fe363310c02844252a8bede70f05cbfe5fa0cd8e3dda455aec6b17b023004d22625322021-09-24 12:19:3926 mins ago0x32f56e521fcfb218eaccba4c83aa689b683f7ad9 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915460.015
0x82951a4d716df67c1057de1e51b4b6efa562ee3db37ad92e10f94b504325905422616652021-09-24 12:03:1943 mins ago0x49850b09433956c396d6b5dfab3d10d865abcf93 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915460.015
0x61b806d506b749391678e37495c9bc755ca22830cd2b12c8db88ce145437645322572522021-09-24 11:00:471 hr 45 mins ago0xaad3273e899e2351bdf067362cb8852a004fc8d8 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.0000119150850.015
0x72d394fd59ae114c563ebdc71b6bd55156b0e5e84fb0a5f19e1327b1129e24f922569862021-09-24 10:53:061 hr 53 mins ago0xefcf3dfbcaaf86c2833c850880747bed133b6a5b IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915280.015
0x5b70b12117b56ef2effe54e69c5a5407f83afcb09849556011628761b967dd3322565572021-09-24 10:46:381 hr 59 mins ago0xc3716d7d8e1eb0ed99d9ddac13c783da09ca3913 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915460.015
0xaf8f3fd2f6c0a1289b7d786671e1873b24f8e3818e6c1eb401a000f552b81ccd22546432021-09-24 10:17:462 hrs 28 mins ago0x3d318917efe7bdd9ff4dc0b9fe06d5bb81362c6b IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915460.015
0x8ac43d46d9436046294301950554f6d44a0b0d9536fa3b5f4d1c6f2a1491fbb722542912021-09-24 10:06:592 hrs 39 mins ago0x58a9ed948c91c73712a703ce9563ae4ce3ddb73a IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011915460.015
0x3d1d84b111106a8a82194d62d3cbb76dcc64e39158ac4aae7cec403af62ee24c22475012021-09-24 8:45:214 hrs 1 min ago0x267469ed38fdeb0d066323bccc94045f6a08d6de IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011912790.015
0xc537a269bfbffe4f76758d47c1cefbac01718746c3f426e7395c266c952d3a1c22471092021-09-24 8:38:304 hrs 7 mins ago0x1f469e73c38a70e26a4854565c83d16d5c9df86f IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.0000196760250.015
0x58b588841571dcd275111c623e4997f6c169aa911963475865e8d1868e6ab80222468832021-09-24 8:32:324 hrs 13 mins ago0x3bf734c8739200cd8dd395459566adbc9a587098 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000011912790.015
0x5603fb1844b25eb67cbd2f3745e13afccac1eccf7c0cab158494452fa67e999d22468642021-09-24 8:32:324 hrs 13 mins ago0x88a063a2b9e8371ce5fb838a548c385b05327e73 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0x356b94437bf78ff228b23dd7e428de77b6d619f5bf9c49c2a1b8acad52724aa122468432021-09-24 8:31:134 hrs 15 mins ago0xe95948a1dd0c37879460dc14235002c2fb0b0a65 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547560.015
0x14f74847ad7506de99e35f168014d12c5adec57c87de8254bbec69fd9195f4ff22468242021-09-24 8:31:134 hrs 15 mins ago0xcde2c3b9ae96c610491e67ecff3b3acbdeb802e1 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0xcdf4f2769f4fe56fb52fc209c869cb34d8c2bf639f4e97f72c4964be1339092622468182021-09-24 8:31:134 hrs 15 mins ago0xc59b0bb48eba02fabb17abd486a9c95309f0e113 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0x4f6247b646f15f6bbce1b299842531774a53aa15d2ae9e42aca1512ff79d7af722468132021-09-24 8:31:134 hrs 15 mins ago0x91c2f27523109d395935adc54f93fbbe0f75f923 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0x2bcd4ccd5a2f06728ab9905e68261a540b39a26ec31cd8c7282bedac794d2c3622468082021-09-24 8:31:134 hrs 15 mins ago0x754dd8cf0faf8ea4367225178bec90537b3e8158 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0xe1b45d8226d838dfdcc25f27b6910459032904f66d3e6b0b01b9b3521202f10322468012021-09-24 8:31:134 hrs 15 mins ago0x65e6fe986783442951fcc9e3dbe7859927bdd270 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0xe3a41d1080d500d57477167f8ce73241a705086266fd83e5f3af9d48ccbe952d22467932021-09-24 8:31:074 hrs 15 mins ago0x1895e784e8096466ec95c1cd17f0304168c9a5e1 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0xa35ae7c6bf5c4c3ddd704518536d5b2417fcb26be4c65e048ed984f31479a31322467862021-09-24 8:29:294 hrs 16 mins ago0x8ac4f6d956ad697e6e69952f53bc82f83d44293e IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0xb4f8942403cc657216e61f8366a8869d2f8b26bf1d915e59ba4aa9deeea8a87322467822021-09-24 8:29:294 hrs 16 mins ago0x93a2aeeaa28543bddd9449ed93c063cc8c18a398 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547560.015
0xb1de283f0a75faab18ed5a863f7e002d634407336d33e8182db370d61a28054122467762021-09-24 8:29:294 hrs 16 mins ago0x3049d84b0a0095f274c8bd92fe980f5133b66384 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547560.015
0x9534e05658d0613149ca742a6eb1f88fa5c1845e0caeeeacfcf3a111c95f6ed122467702021-09-24 8:29:294 hrs 16 mins ago0xb4a5a4e1483b461395c17e5914b0d4be11d29618 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
0x1da37a083c496a31701d3a7fdd51ff60ad551d939df84ceffb7d4ad185781dd322467602021-09-24 8:29:294 hrs 16 mins ago0x18b04bb8c4c4251275a9188f9332d0015b0b8664 IN  0x2057c8ecb70afd7bee667d76b4cd373a325b1a200 Ether0.000012547740.015
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0x5e3d34d3d5d500af7d929f54652405401f10ac64a7965c04c3599b54e7282cd18564202021-08-21 20:38:4933 days 16 hrs ago 0xdeaddeaddeaddeaddeaddeaddeaddeaddead0006  Contract Creation0 Ether
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x3666f603Cc164936C1b87e207F36BEBa4AC5f18a

Contract Name:
HopBridgeToken

Compiler Version
v0.6.12

Optimization Enabled:
Yes with 1 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at optimistic.etherscan.io on 2021-08-19
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/*
 * @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;
    }
}

/**
 * @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);
}

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

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

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

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

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

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

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

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

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

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

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

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

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

/**
 * @dev Implementation of the {IERC20} 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 {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-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 ERC20 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 {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    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 name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-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 virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * 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 virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: 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 {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual 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 {IERC20-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 virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        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 virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: 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 virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _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 virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: 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 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 virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

/**
 * @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;
    }
}

/**
 * @dev Hop Bridge Tokens or "hTokens" are layer-2 tokens that represent a deposit in the L1_Bridge
 * contract. Each Hop Bridge Token is a regular ERC20 that can be minted and burned by the L2_Bridge
 * that owns it.
 */

contract HopBridgeToken is ERC20, Ownable {

    constructor (
        string memory name,
        string memory symbol,
        uint8 decimals
    )
        public
        ERC20(name, symbol)
    {
        _setupDecimals(decimals);
    }

    /**
     * @dev Mint new hToken for the account
     * @param account The account being minted for
     * @param amount The amount being minted
     */
    function mint(address account, uint256 amount) external onlyOwner {
        _mint(account, amount);
    }

    /**
     * @dev Burn hToken from the account
     * @param account The account being burned from
     * @param amount The amount being burned
     */
    function burn(address account, uint256 amount) external onlyOwner {
        _burn(account, amount);
    }
}

Contract Security Audit

Contract ABI

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Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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