Contract 0x38E0f4167577cF73BAf801100e466d2b363fB586

 

Contract Overview

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0 BNB

BNB Value:
$0.00

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0x253620c7a98e04ca16dc1427b84d25a58c13b090ce2583afd0b77edbe06f1933Issue Tokens118540602021-10-17 14:59:548 hrs 14 mins ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.023347584
0xc2658364c218740234eaf85ca8a022626df3edf35ad7c36f5da91881ccfa9e9eIssue Tokens118438372021-10-17 6:25:0916 hrs 49 mins ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.006001620029
0x6ede1dfd9eb0715b0cdc9242cd6fe4d13e9924e46c101a7a68bcee4c9fbea45cIssue Tokens118151842021-10-16 6:25:111 day 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.006
0x04bf83e9645e5c711d9c8c9a86ddae14ed65c56bf8ad2d29c6c3bca2a5dfc30cIssue Tokens117864922021-10-15 6:25:082 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00384382
0x7a5e9eeecf3f8701ab840e9cee31eb7308650066b64b40b25035a4496dd65f2fIssue Tokens117577662021-10-14 6:25:083 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00384382
0x54dea464d545610f5c1e1bf63e379013a3dd05c11e86e5c9c0934b70c4e413b1Issue Tokens117295472021-10-13 6:25:094 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00384382
0x1bc2e08293e27f0ed1448d341f4b8e073b65b941fdffba5d51207b0b49d83a2bStake Tokens117107382021-10-12 14:41:435 days 8 hrs ago0xc006be40ae25c6a4b57ec4968920b001e66c3df2 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.004901112
0xabd993deab91329d4b52340b1d28410c4f58e14a4f837f8a7025cf79e9a0de23Issue Tokens117009002021-10-12 6:25:095 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00372328
0xcb460f72fa0453d3ec3dfca8e1405508f900e5048075aa70d2b90e9fa9c4fe2dIssue Tokens116729412021-10-11 6:25:096 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00372328
0xbc662e790cd70ef19611e2db12e1e954ecd4b9227d696bd79f146cebbc6767d3Stake Tokens116452672021-10-10 7:14:347 days 16 hrs ago0x3546905bdffb88d4e97761a179ebdc8ce814361a IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.000783696
0x2f7314397fc5eb44f3629920cc255e641315b448b0aacca30d1da7332fed8867Stake Tokens116452162021-10-10 7:12:017 days 16 hrs ago0x3546905bdffb88d4e97761a179ebdc8ce814361a IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00065308
0x8758b97e4207b4b93f98e6042fd7ab5fecca7a74597b4207edf0b1bcb9aa6b0aIssue Tokens116442792021-10-10 6:25:067 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00372328
0x09cc356959b903f715f45aafb7bf144e0df0d75e7fd6139ab8816190800aa494Issue Tokens116155342021-10-09 6:25:088 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00372328
0xd6dcb38b653a175a0706d68d792912443dd6b8d9ebed5697f6a963d26eabf999Issue Tokens115868352021-10-08 6:25:089 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00372328
0xfbb909a45ab731c98c7c8215ea76b042af9bae52e73c3fef15120f6392f858f8Issue Tokens115580722021-10-07 6:25:0910 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00372328
0xd2a0c9ca9fa609277273c8de498b657ce4323f31b40d18a914b1832fed919245Issue Tokens115292992021-10-06 6:25:0911 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00372328
0xc78fa3e56d24f4a0004de753ec440d7c843800ae50a1e37078c6d9a0a8284fb0Stake Tokens115128252021-10-05 16:40:1612 days 6 hrs ago0xa2b4c41451943e4aa8d668eb4643e587ace61209 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00068071
0xa74bf89429ea5f2cad27110e72aeb0977621ae3c21f44a101dc4689f60d0265dIssue Tokens115005322021-10-05 6:25:0912 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00360276
0xecdf04530062ed53ac10f0584ae2b022a555c1731fb702f2695b1019ac1bf980Issue Tokens114717672021-10-04 6:25:1113 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00360276
0x2672ff71bbb079df0ab2c2c3055ade1797fd7d24cc77365624c054bd38f6a468Stake Tokens114501772021-10-03 12:22:1714 days 10 hrs ago0x307d70086d69e95f0e22fcebfdfee18bd9dae08d IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.001175976
0x06a81b45d00ffce22929d878825d4e4ad86a43152a31c729af5b0b5292030622Issue Tokens114430482021-10-03 6:25:0914 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00360276
0x28b6eecd135c3ffd79b89ae0d7e6ca967a63058717619ad72483d73d3ada084aIssue Tokens114145622021-10-02 6:25:0915 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00360276
0x7cee650b23b19c1ead304f41cacf8b692f004449e97c60e8acb03fc4fa2ce25fStake Tokens114132192021-10-02 5:17:3615 days 17 hrs ago0x8793b06c5d68eb81683238a125569c2fd9686dcb IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.002014416
0xec1f461a397b21db760089df572d20c3f5af266d5d3b4e6fc0e6d8dd6545c806Stake Tokens113893142021-10-01 9:04:5416 days 14 hrs ago0x46595131b683514047931b33eb189a5f8f20af69 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.003245184
0x466fa44f03c4b43baeca44289d74cff00f8b59d30f1b431dd27b7d7c22b7a65eIssue Tokens113861232021-10-01 6:25:0916 days 16 hrs ago0x458c9181f2df2bf7475a62372d4be558edd5c906 IN  0x38e0f4167577cf73baf801100e466d2b363fb5860 BNB0.00358382
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Contract Source Code Verified (Exact Match)

Contract Name:
TokenFarm

Compiler Version
v0.5.17+commit.d19bba13

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-09-15
*/

// Sources flattened with hardhat v2.6.2 https://hardhat.org

// File @openzeppelin/contracts/GSN/[email protected]

pragma solidity ^0.5.0;

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view 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/token/ERC20/[email protected]

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

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

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


// File @openzeppelin/contracts/math/[email protected]

pragma solidity ^0.5.0;

/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


// File @openzeppelin/contracts/token/ERC20/[email protected]

pragma solidity ^0.5.0;



/**
 * @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 {ERC20Mintable}.
 *
 * 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;

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 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 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 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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

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

        _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 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), "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 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, "ERC20: burn amount exceeds allowance"));
    }
}


// File @openzeppelin/contracts/utils/[email protected]

pragma solidity ^0.5.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    // counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor () internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
    }
}


// File src/contracts/TokenFarm.sol

pragma solidity ^0.5.0;



contract TokenFarm is ReentrancyGuard {
    using SafeMath for uint256;

    string public name = "Rewards Staking Dapp";
    address public owner;
    ERC20 public erc20;
    uint256 public pot;

    address[] public stakers;
    mapping(address => uint256) public startTime;
    mapping(address => uint256) public stakingBalance;
    mapping(address => bool) public hasStaked;
    mapping(address => bool) public isStaking;

    constructor(ERC20 _erc20) public {
        erc20 = _erc20;
        owner = msg.sender;
    }

    // Staking tokens
    function stakeTokens(uint256 _amount) external nonReentrant {
        // Require amount greater than 0
        require(_amount > 0, "amount cannot be 0");

        // Transfer tokens to this contract for staking
        erc20.transferFrom(msg.sender, address(this), _amount);

        // Update staking balance
        stakingBalance[msg.sender] = SafeMath.add(
            stakingBalance[msg.sender],
            _amount
        );

        // Add user to stakers array *only* if they haven't staked already
        if (!hasStaked[msg.sender]) {
            stakers.push(msg.sender);
        }

        // Update staking status
        isStaking[msg.sender] = true;
        hasStaked[msg.sender] = true;

        // Add stake timestamp
        startTime[msg.sender] = block.timestamp;

        // Update pot if owner
        if (msg.sender == owner) {
            pot = SafeMath.add(
                pot,
                _amount
            );
        }
    }

    // Unstaking Tokens (Withdraw)
    function unstakeTokens() external nonReentrant {
        // Fetch staking balance
        uint256 balance = stakingBalance[msg.sender];

        // Require amount greater than 0
        require(balance > 0, "staking balance cannot be 0");

        // Transfer tokens from this contract back to staker
        erc20.transfer(msg.sender, balance);

        // Reset staking balance
        stakingBalance[msg.sender] = 0;

        // Update staking status
        isStaking[msg.sender] = false;

        // Update staking timestamp
        startTime[msg.sender] = block.timestamp;

        // Update pot if owner
        if (msg.sender == owner) {
            pot = 0;
        }
    }

    // Get active stakers count
    function getActiveStakeCount() external view returns (uint256) {
        uint256 count = 0;

        for (uint256 i = 0; i < stakers.length; i++) {
            address activeStakerCount = stakers[i];
            if (activeStakerCount != owner && isStaking[activeStakerCount] == true) {
                count = count + 1;
            }
        }
        return count;
    }

    // Get active stakers balance
    function getActiveStakeBalance() external view returns (uint256) {
        uint256 activeBal = 0;

        for (uint256 i = 0; i < stakers.length; i++) {
            address activeStaker = stakers[i];
            if (activeStaker != owner) {
                uint256 balance = stakingBalance[activeStaker];
                activeBal = activeBal + balance;
            }
        }
        return activeBal;
    }

    // Get Staking Rewards pot
    function getStakingPot() external view returns (uint256) {
        return pot;
    }

    // Issuing Tokens
    function issueTokens() external nonReentrant {
        // Only owner can call this function
        require(msg.sender == owner, "caller must be the owner");

        // Issue tokens to all stakers
        for (uint256 i = 0; i < stakers.length; i++) {
            address recipient = stakers[i];
            uint256 balance = stakingBalance[recipient];
            
            // 365 days / 30 = 12.166666667 30 day intervals in a year
            // 21% yearly APY / 12.166666667 intervals=1.726
            uint256 yield = SafeMath.add(SafeMath.div(SafeMath.mul(balance, 1726), 100000), balance);
            
            // Calculate staking time based on current block
            uint256 end = block.timestamp;
            uint256 totalTime = SafeMath.sub(end, startTime[recipient]);

            // Balance is not 0 and exclude owner
            if (balance > 0 && recipient != owner) {
                
                // Staking for more than 30 days in seconds 2592000
                // For testing 20 minutes 1200
                if (totalTime > 2592000) {
                    
                    // Add APY staking interest to existing balance
                    stakingBalance[recipient] = yield;

                    // Update staking timestamp
                    startTime[recipient] = block.timestamp;

                    // Update pot balance
                    pot = SafeMath.sub(
                        stakingBalance[owner],
                        yield
                    );
                }
            }
        }
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"contract ERC20","name":"_erc20","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"constant":true,"inputs":[],"name":"erc20","outputs":[{"internalType":"contract ERC20","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getActiveStakeBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getActiveStakeCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getStakingPot","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"hasStaked","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isStaking","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"issueTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"pot","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"stakeTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stakers","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"stakingBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"startTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unstakeTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000036bdd5ba9619ee0a895f8dc02867ebf453cb352

-----Decoded View---------------
Arg [0] : _erc20 (address): 0x036bdd5ba9619ee0a895f8dc02867ebf453cb352

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000036bdd5ba9619ee0a895f8dc02867ebf453cb352


Deployed ByteCode Sourcemap

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Swarm Source

bzzr://7f7a3dfcc0fc33872fc631e7d407e2fe75557c7ec11218a89e6563f6e1fc5548
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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