Contract 0xfde7ac8e82d261d5bcea44dfcda42d32c5a74615

 

Contract Overview

Hamster: HMSTR Token
Balance:
0 BNB

BNB Value:
$0.00

Token:
Txn Hash
Block
From
To
Value [Txn Fee]
0x3d63d1428f0b56a7a777f08509b430412734487c0689375070682e1f525719cb85600332021-06-23 23:18:5619 hrs 14 mins ago0x176578bf964b1c41bf715ff296065f113ce99298 IN  Hamster: HMSTR Token0 BNB0.0000728
0x8094c622da46e6ba86ef18d06683be829360bf5b0db48ca019d383fed9f18eb484082902021-06-18 16:12:036 days 2 hrs ago0x62b4265f8f66abc1c78b2c33bbaa7b8d38835716 IN  Hamster: HMSTR Token0 BNB0.000222515
0x99eab2a534900d8e0f3862fba44befcd80893db31ef5f66f0e152990dcdafcfa82765672021-06-14 1:15:4910 days 17 hrs ago0x9189f39081ca5beaa94f3d01c1dbfaf45ef622cd IN  Hamster: HMSTR Token0 BNB0.000222515
0x4573f6b88322fe39e603b9530296122fccaaaa2260e2fed5ac469912f8d52cc282642162021-06-13 14:50:0211 days 3 hrs ago0xfcca0c411a015aeee69f3abc3323a06a60959bd1 IN  Hamster: HMSTR Token0 BNB0.000222515
0xa9a79ff3de285509ee7a6ad1f70c4b8f766e86b3418e58158a8d23f820a0607381200092021-06-08 14:06:4616 days 4 hrs ago0x549268e613285488ebe3e5983bb2aca4f642f0c4 IN  Hamster: HMSTR Token0 BNB0.000222515
0x1a2c83b791882bda463fa42fda1051891913d1093ff48a556aabf30676421a4981146512021-06-08 9:38:3516 days 8 hrs ago0xa92e80a0b7c24579164f1115d8883423d274f469 IN  Hamster: HMSTR Token0 BNB0.000222515
0x7529b4f5eedbbc7d7fae67da35fad31dbe79353293e55690789897b13474b39e80341622021-06-05 14:27:1219 days 4 hrs ago0x2c2a8f98a37702aa585143aa9ead88f7705dfc46 IN  Hamster: HMSTR Token0 BNB0.000222515
0x0e28ff1462737cafe9491f36bd53ca87b2e07e1778f12761cfda74943bcf679579966292021-06-04 7:07:2320 days 11 hrs ago0x3e5067561405da57cf32f919aec728cf5808e493 IN  Hamster: HMSTR Token0 BNB0.000222515
0x0744e4f75240ec290390688c5b3f5b8dfbbb59032eb9c2f79a611a3a29055e0979884072021-06-04 0:12:5020 days 18 hrs ago0x6b5e7a76a96bec243ed24b15098bdbeb246ef1f0 IN  Hamster: HMSTR Token0 BNB0.000181635
0x0035d79cc5ebfcd1cde219a0dcc910b14d9325697a1b10f63e6496f5d0d33ed579831412021-06-03 19:49:1620 days 22 hrs ago0xb7cc13b81bcc15e27ceb730b30f1293254d1c21c IN  Hamster: HMSTR Token0 BNB0.000222515
0x66ca2ecb1594b073da52d4af55bd3d76f58fc20ff6eb632da69d8e0dc4b3283479730452021-06-03 11:22:2321 days 7 hrs ago0x14cffabad4c3c591655bd463ea585ba0e5dae342 IN  Hamster: HMSTR Token0 BNB0.000222515
0x5c03160023f6a42175fdb2df41866336809b87f411e61391e5d53b4b2d7f4b4579529132021-06-02 18:32:4422 days ago0x7b49d8d2ebe82a5de0514d5567ae90ae6e95f2c8 IN  Hamster: HMSTR Token0 BNB0.000222515
0x11287f614aa18a97bb7ea6ed99b4a0488526595ef89ac40f0a295748aa67687079230492021-06-01 17:35:0223 days 58 mins ago0xef94426d9d8853581073d5bbb24eaf5d890871a8 IN  Hamster: HMSTR Token0 BNB0.000222515
0x02ac707f17771fad296ca4abfaea18c1a0d7753e3b467a2f5d9612349e999ac378691822021-05-30 20:29:1324 days 22 hrs ago0x57e99189c5b541cfb798029039a4f05221b25a87 IN  Hamster: HMSTR Token0 BNB0.000222515
0x9c06e385566d91af06f2248c59d07856d4bea192953a8bd7d6e616e5febf396378685742021-05-30 19:58:4924 days 22 hrs ago0x39e60458426d26c27d8a6a767697abf2796d228a IN  Hamster: HMSTR Token0 BNB0.000222515
0x8d01ea92a5f6bbf4fcc76de073f6cd114455d70cfd5ca4a8ba303756d21a75fd78685522021-05-30 19:57:4324 days 22 hrs ago0x39e60458426d26c27d8a6a767697abf2796d228a IN  Hamster: HMSTR Token0 BNB0.000222515
0x8a9df36e362ce70391a626cdf9a89594786a1443cabb7713262edb8bdd9855ad78240942021-05-29 6:48:2626 days 11 hrs ago0x233435ef6631a79dcf859123102e2b80a5cfc054 IN  Hamster: HMSTR Token0 BNB0.000139635
0xb9e0fc294300d2692f5d737befa333d254d441aa853b75e5d47b705d8202ee9478240242021-05-29 6:44:5626 days 11 hrs ago0x233435ef6631a79dcf859123102e2b80a5cfc054 IN  Hamster: HMSTR Token0 BNB0.000139635
0x923605e9cd0f489981e289ca94bc1631186b43f1657c6591366af42550f0f6f978173712021-05-29 1:11:0626 days 17 hrs ago0x2dcf9b6f2668d3da76d25246ef6d35035a137d5b IN  Hamster: HMSTR Token0 BNB0.000222515
0x7f82e7870a76b83b7a9ed29c96dc24949e0b10df307e5f70de18d2e03458c54878121162021-05-28 20:46:4226 days 21 hrs ago0x92948a9aeb43eb1da0a675367f10a02fde1847d8 IN  Hamster: HMSTR Token0 BNB0.000139035
0x097d93b5f57fb867dcf3cd296d4baefb79a7e0af867a641ddd400ee5894a249578011842021-05-28 11:38:3427 days 6 hrs ago0x340716d1e87bcfed759296f9602036bbace0735b IN  Hamster: HMSTR Token0 BNB0.000222515
0x5e9f0de3b9b3ef4ae87aed7c927d6df7ac35b32a4d1d1d362a6a4f67a60d3dfc77871962021-05-27 23:57:2627 days 18 hrs ago0x234f134c8e34b03a5b3b9148c07d905a0c497cd8 IN  Hamster: HMSTR Token0 BNB0.000222515
0x11fb6971cdf7eedd3c4a6cdc2da6dad2b8506f836cebe1283425c120d570e44077868872021-05-27 23:41:5627 days 18 hrs ago0x234f134c8e34b03a5b3b9148c07d905a0c497cd8 IN  Hamster: HMSTR Token0 BNB0.000222515
0x784de5193c7d5c82f52ed63a30222c50fc757a06a0b3cb9778945d58fc162a5877844602021-05-27 21:40:3027 days 20 hrs ago0x219781d05f42b379d1c72c933006ec538ba5d47e IN  Hamster: HMSTR Token0 BNB0.000222515
0x4079a46eee4a2a8d4f1623f32802810d06ebbf96010484d01203f1d062333d2677768752021-05-27 15:19:4628 days 3 hrs ago0x9b17e8416382481155ec7058c8c06b736af7f892 IN  Hamster: HMSTR Token0 BNB0.000222515
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OVERVIEW

HamsterSwap Finance (HMSTR) forked from Goose Finance with equivalent tokenomics and high security level. It offers yield farming and staking.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x1e192aff5edbc28b54592e68958ea2bfc11bba8e612f318241846e959342012154711592021-03-07 11:50:54109 days 6 hrs ago PancakeSwap: HMSTR Hamster: HMSTR Token0 BNB
0x1e192aff5edbc28b54592e68958ea2bfc11bba8e612f318241846e959342012154711592021-03-07 11:50:54109 days 6 hrs ago PancakeSwap: Router Hamster: HMSTR Token0 BNB
0x587da67d9b325db25d14e757601fa23652538d5f1f417960d067ebb921cec78254711432021-03-07 11:50:06109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x587da67d9b325db25d14e757601fa23652538d5f1f417960d067ebb921cec78254711432021-03-07 11:50:06109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x587da67d9b325db25d14e757601fa23652538d5f1f417960d067ebb921cec78254711432021-03-07 11:50:06109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x587da67d9b325db25d14e757601fa23652538d5f1f417960d067ebb921cec78254711432021-03-07 11:50:06109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x38689e87a3e46afba36ca363dd44d0391c28a9c50be17ead7536655ad2847de454709572021-03-07 11:40:48109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x38689e87a3e46afba36ca363dd44d0391c28a9c50be17ead7536655ad2847de454709572021-03-07 11:40:48109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x38689e87a3e46afba36ca363dd44d0391c28a9c50be17ead7536655ad2847de454709572021-03-07 11:40:48109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x38689e87a3e46afba36ca363dd44d0391c28a9c50be17ead7536655ad2847de454709572021-03-07 11:40:48109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x2cd9ea88b0aa8717fb8667d4d9d5a3eccb86d8c567780b7a8da546250b916c9354709522021-03-07 11:40:33109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x2cd9ea88b0aa8717fb8667d4d9d5a3eccb86d8c567780b7a8da546250b916c9354709522021-03-07 11:40:33109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x2cd9ea88b0aa8717fb8667d4d9d5a3eccb86d8c567780b7a8da546250b916c9354709522021-03-07 11:40:33109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x2cd9ea88b0aa8717fb8667d4d9d5a3eccb86d8c567780b7a8da546250b916c9354709522021-03-07 11:40:33109 days 6 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x8128a72ca7b7cee7b3effb8c219597e4588250578ff9bf1bf8a6dc4f12c8cad154704722021-03-07 11:16:33109 days 7 hrs ago PancakeSwap: HMSTR Hamster: HMSTR Token0 BNB
0x8128a72ca7b7cee7b3effb8c219597e4588250578ff9bf1bf8a6dc4f12c8cad154704722021-03-07 11:16:33109 days 7 hrs ago 0x0c5362f7c80ff3124843df2510b9e7368e237ea6 Hamster: HMSTR Token0 BNB
0x8128a72ca7b7cee7b3effb8c219597e4588250578ff9bf1bf8a6dc4f12c8cad154704722021-03-07 11:16:33109 days 7 hrs ago PancakeSwap: BUSD-HMSTR Hamster: HMSTR Token0 BNB
0x8128a72ca7b7cee7b3effb8c219597e4588250578ff9bf1bf8a6dc4f12c8cad154704722021-03-07 11:16:33109 days 7 hrs ago PancakeSwap: BUSD-HMSTR Hamster: HMSTR Token0 BNB
0x16d1babd66754cfa102c4404085423d9cb2904466e60fee37c80c9021d0abbbe54703542021-03-07 11:10:39109 days 7 hrs ago PancakeSwap: BUSD-HMSTR Hamster: HMSTR Token0 BNB
0x16d1babd66754cfa102c4404085423d9cb2904466e60fee37c80c9021d0abbbe54703542021-03-07 11:10:39109 days 7 hrs ago PancakeSwap: BUSD-HMSTR Hamster: HMSTR Token0 BNB
0x6fb3c99ef27e66e6de81b35cc360a75e0e6a4d089f74de22bbbc7069aa61c59254703192021-03-07 11:08:54109 days 7 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x6fb3c99ef27e66e6de81b35cc360a75e0e6a4d089f74de22bbbc7069aa61c59254703192021-03-07 11:08:54109 days 7 hrs ago 0x8e2e7926bc69669bf603c07f66e5740341dbb844 Hamster: HMSTR Token0 BNB
0x27a5bb46a727af7fdd49eda3551a75288f3743da1fb8f787fc319f32bb3f129954703052021-03-07 11:08:12109 days 7 hrs ago PancakeSwap: BUSD-HMSTR Hamster: HMSTR Token0 BNB
0x27a5bb46a727af7fdd49eda3551a75288f3743da1fb8f787fc319f32bb3f129954703052021-03-07 11:08:12109 days 7 hrs ago PancakeSwap: Router Hamster: HMSTR Token0 BNB
0x6106f963ff0bd4dd9914a1f961baa1176311c3a52ce13eba3cb1ca51df1bbcb354702882021-03-07 11:07:21109 days 7 hrs ago PancakeSwap: HMSTR Hamster: HMSTR Token0 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
HMSTR

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 2021-02-26
*/

// File: @openzeppelin/contracts/GSN/Context.sol
//"SPDX-License-Identifier: UNLICENSED"

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 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: 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, 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: 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/TestToken.sol

pragma solidity 0.6.12;


// HMSTRToken with Governance.
contract HMSTR is BEP20('Hamster', 'HMSTR') {
    /// @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

    /// @dev 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), "HMSTR::delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "HMSTR::delegateBySig: invalid nonce");
        require(now <= expiry, "HMSTR::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, "HMSTR::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 HMSTRs (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, "HMSTR::_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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Swarm Source

ipfs://81bf0a9cfecb848f6028e9b69616a7bc6fdc4f230a5d02d97cf0e4fb031bbea3
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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