Contract 0xdf9b4b57865b403e08c85568442f95c26b7896b0 5

 
Sunflower Land token contract has migrated to a new address.
 
Txn Hash
Method
Block
From
To
Value [Txn Fee]
0x30cfe0929b8578ae4fd96c1221c912142441d0e8092e28eefe2cfd960f3539e2Transfer436337332023-06-07 11:22:073 hrs 56 mins agoMEXC.com IN  Sunflower Farmers: Old SFF Token0 MATIC0.014450189828278.68681084
0x9d2c2dbafa2b9b70f836e002cb26bc699fb32c720e04ddb22eccdaf648bbc517Approve436288712023-06-07 8:25:546 hrs 53 mins ago nezimakizaru.nft  IN  Sunflower Farmers: Old SFF Token0 MATIC0.003748514154
0x89d42c83eaa8b5653058097ccbb60a427b694601dc5d97634e25acfc732f7535Approve436224632023-06-07 4:29:5810 hrs 49 mins ago0xd6da304c946a09c7492461cf85dbaf552f75106d IN  Sunflower Farmers: Old SFF Token0 MATIC0.003944940231 162.069768364
0x026398e7e785b21f95454d6165efca637ba96cc9363ecc0ae64073d666aa46d4Approve435973312023-06-06 13:05:571 day 2 hrs ago0x1a5ad80223110124aa8fab68e09dfb828b7ba053 IN  Sunflower Farmers: Old SFF Token0 MATIC0.004676360524 192.11866909
0xcf40eccb3ab1e756e6f67025bbd7cf14615f8520060e93013eddf1f3f19e8289Approve435973282023-06-06 13:05:511 day 2 hrs ago0x1a5ad80223110124aa8fab68e09dfb828b7ba053 IN  Sunflower Farmers: Old SFF Token0 MATIC0.004639794938 190.616447093
0xb9b30f3816785d69835e7084e997aa70a55b658dbbacbacf8309d55400b53670Approve435506552023-06-05 8:27:552 days 6 hrs ago0x687624200b26d133cc089a870d827ecbe0630a78 IN  Sunflower Farmers: Old SFF Token0 MATIC0.004575693597 187.98297514
0xc04a08191c185905db462a13be3992428710794a745918072eb897bfad6df874Approve435365252023-06-04 23:27:492 days 15 hrs ago0xf93d156e8e4e199e07d6f64e226db569f09b555a IN  Sunflower Farmers: Old SFF Token0 MATIC0.00736675158
0x8c5eb43429443b54ccf4de8008b07087a3b798e2f040e076d7359d5baee12cdaTransfer435256802023-06-04 16:42:472 days 22 hrs ago0x0cfb269b7ecdf6a8c72971d70e4c27303c836bcf IN  Sunflower Farmers: Old SFF Token0 MATIC0.004719974916 173.764860891
0xdef0688c88fd7d964e0fc09ed5cac7bc131b2c85d0576cafeb095e4fd79f719aTransfer435098202023-06-04 6:38:343 days 8 hrs ago0xb34ed85bc0b9da2fa3c5e5d2f4b24f8ee96ce4e9 IN  Sunflower Farmers: Old SFF Token0 MATIC0.007867315001151.72928201
0x10f2292a58431247dad7cdee37f27bc5cd280b174d0c2d224f2e2688e5621bcaApprove435003982023-06-04 0:48:513 days 14 hrs ago0x18363bcf247a7d78fe56d7fb0915d7d258e54093 IN  Sunflower Farmers: Old SFF Token0 MATIC0.003706721179 152.283027799
0xdda04b4a6292ba5149229ba735514f823bdaef2f5dc42f29670a6177a7f5edafApprove434942572023-06-03 21:03:343 days 18 hrs ago0xd854e3b41be90ce5facbe6fdda35a9b12a3b9fcd IN  Sunflower Farmers: Old SFF Token0 MATIC0.003447289034 141.624790848
0x8d2093afe2c15183b19748adfa63e60dd97472a9a853418917df26f12ee141e1Approve434594882023-06-02 22:26:484 days 16 hrs ago0x31210de9a816e21e7e5875827ea15bf15ce12381 IN  Sunflower Farmers: Old SFF Token0 MATIC0.00379766087 156.019098249
0xb982c05b3f48a874f5497b09aa881c220a291f75ee64b06f9ee700ca98b1e799Transfer434251942023-06-01 23:34:575 days 15 hrs ago0xb34ed85bc0b9da2fa3c5e5d2f4b24f8ee96ce4e9 IN  Sunflower Farmers: Old SFF Token0 MATIC0.007701290258148.527323654
0x7987a5372b6026dcb71308d3c08068d63c7ae36187eeb37a09434625f3b2f873Approve434118312023-06-01 15:12:596 days 6 mins ago0x03f4b156e8c077219a69a4ec63faca4b449b7723 IN  Sunflower Farmers: Old SFF Token0 MATIC0.003943005692 161.990291773
0x5bddf564ebb818f22e583e85e5484d9a3a1412efde8eb11fa68fd716aa480bbeTransfer434117422023-06-01 15:09:176 days 9 mins ago0xb34ed85bc0b9da2fa3c5e5d2f4b24f8ee96ce4e9 IN  Sunflower Farmers: Old SFF Token0 MATIC0.008806962462169.812052187
0x011b47cbc6cf33f045bbd410b879da527c662108edef3662af70a6a42954a3eeApprove434082802023-06-01 13:02:026 days 2 hrs ago0x1c2040d9954ff29f52e856f8963ad2b930240885 IN  Sunflower Farmers: Old SFF Token0 MATIC0.004327644876 177.792402817
0x4b54368ba6972087bec60cc0d467cc6dd1d0ff59b5f412d66a81ecc314c28b29Transfer433962052023-06-01 5:48:206 days 9 hrs ago0x0fd95dae40ef6625d714c34e96d1b822c8ba63bf IN  Sunflower Farmers: Old SFF Token0 MATIC0.012151376015487.009579385
0x96e77c624506eebbc7d4bd4d4495bb828297a614b7e537b2da314ee4a2532a23Transfer433962022023-06-01 5:48:146 days 9 hrs ago0x0fd95dae40ef6625d714c34e96d1b822c8ba63bf IN  Sunflower Farmers: Old SFF Token0 MATIC0.022365957574896.395237628
0x35d93befa2c2f5d97f7251396f69cc5ae9d7412df2ef188e505e2dbe8b1825fdTransfer433962002023-06-01 5:48:106 days 9 hrs ago0x0fd95dae40ef6625d714c34e96d1b822c8ba63bf IN  Sunflower Farmers: Old SFF Token0 MATIC0.024101622429965.958175196
0x7c0ed718a0d7914fcfc31b4369dad34ec9e39dd8a867a8a5c9c4a176b6750284Transfer433961992023-06-01 5:48:086 days 9 hrs ago0x0fd95dae40ef6625d714c34e96d1b822c8ba63bf IN  Sunflower Farmers: Old SFF Token0 MATIC0.012151376015487.009579385
0x15b7ca3c4f8d230b6b6bd4e6280e0bc37fc034910c376808a8bc479bd723c66dTransfer433961972023-06-01 5:48:046 days 9 hrs ago0x0fd95dae40ef6625d714c34e96d1b822c8ba63bf IN  Sunflower Farmers: Old SFF Token0 MATIC0.012151376015487.009579385
0x0f8e496f9efd401748472cae9d07de11f7d3f25642b79e4a6b689cb914dc07abTransfer433961972023-06-01 5:48:046 days 9 hrs ago0x0fd95dae40ef6625d714c34e96d1b822c8ba63bf IN  Sunflower Farmers: Old SFF Token0 MATIC0.02430275203974.019158768
0xbd479eb8048eea44370fe8306f5e76c01f2851f116edc25427fdc20eee07346cTransfer433961952023-06-01 5:48:006 days 9 hrs ago0x0fd95dae40ef6625d714c34e96d1b822c8ba63bf IN  Sunflower Farmers: Old SFF Token0 MATIC0.014580579797487.009579385
0x08f6f95de13172ee7560686718cd524573a9b0a84ec52a31227692dfd5b8463fTransfer433958062023-06-01 5:33:376 days 9 hrs ago0xf157478279eaf6f91bc0733c7a0670c397274edf IN  Sunflower Farmers: Old SFF Token0 MATIC0.022406970609898.03898077
0x721ab2313017e116ad2f0442dbbb05c7584e6cdbc5ccbe46ab81d20a79eef3c0Transfer433958042023-06-01 5:33:336 days 9 hrs ago0xf157478279eaf6f91bc0733c7a0670c397274edf IN  Sunflower Farmers: Old SFF Token0 MATIC0.019271310272772.366248734
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OVERVIEW

Sunflower Land token contract has migrated to 0xD1f9c58e33933a993A3891F8acFe05a68E1afC05.

Latest 9 internal transactions
Parent Txn Hash Block From To Value
0x429e255765d43c245d7cd98175175cd29b54c5aade97443a43dbdb2f729b4ac3352464752022-11-05 21:20:05213 days 17 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.00015531559731823 MATIC
0x11c67bb00dbce8675a15f37f0f7d6c0fed99e9ee4e6fe54a004360535b6e4d7b352464752022-11-05 21:20:05213 days 17 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.000158097489279755 MATIC
0x2f3edf1c053fc4919d187ee11d94a4386ce414dd10e96d797b0bf209eafa59bb352461172022-11-05 21:07:45213 days 18 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.000149950058034396 MATIC
0x641edb4e3dae7049fe158df12a6e0fd881a99bce2dfe800fcf1b9431069840ca307855212022-07-16 11:32:31326 days 3 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.000121815039254087 MATIC
0x25f32c8577bb13948128f386c756e32f2d0548028dc4be0a1c17c5e34e065c8d290209552022-06-01 5:22:22371 days 9 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.00010470870122962 MATIC
0x4143503cb6b62a68c835ee3b0b5400b48be3deeedfa7b5bd4e60fe531b060e56273576292022-04-20 9:51:42413 days 5 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.000037114035351925 MATIC
0xdfadee232e1c9345a2a6b488e3b8efe9ef3796d563fc6d5b9cf450e548c1ca6b250320772022-02-17 2:30:35475 days 12 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.00003684147900749 MATIC
0xc9aa2405d9b980f51fd7c638d30845c791036e16b4cbadaf577d1d6023bc974b248012592022-02-11 4:54:26481 days 10 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.000001609927730275 MATIC
0xa86680351c6ea6a91726a2793a1d2bfdc14a08b973e90abcc162bbc719e1b3d0242951102022-01-29 7:05:44494 days 8 hrs ago 0xee578e0e4a1400790e9d2ffc1b133e074bbdb4e1 Sunflower Farmers: Old SFF Token0.000000050164901779 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
TokenV2

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2021-11-30
*/

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/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: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/token/ERC20/IERC20.sol



pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/GSN/Context.sol



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: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/token/ERC20/ERC20.sol



pragma solidity >=0.6.0 <0.8.0;




/**
 * @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 {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 returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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 returns (uint8) {
        return _decimals;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 {
        _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 { }
}

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.3.0/contracts/token/ERC20/ERC20Burnable.sol



pragma solidity >=0.6.0 <0.8.0;



/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    using SafeMath for uint256;

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

// File: contracts/Token.sol


pragma solidity >=0.6.0 <0.8.0;

//import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
//import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";




contract TokenV2 is ERC20, ERC20Burnable {
  address public minter;
  address private owner;

  event MinterChanged(address indexed from, address to);

  constructor() payable ERC20("Sunflower Farm", "SFF") {
    owner = msg.sender;
  }

  function passMinterRole(address farm) public returns (bool) {
    require(minter==address(0) || msg.sender==minter, "You are not minter");
    minter = farm;

    emit MinterChanged(msg.sender, farm);
    return true;
  }
  
  function getOwner() public view returns (address) {
      return owner;
  }

  function mint(address account, uint256 amount) public {
    require(minter == address(0) || msg.sender == minter, "You are not the minter");
		_mint(account, amount);
	}

  function burn(address account, uint256 amount) public {
    require(minter == address(0) || msg.sender == minter, "You are not the minter");
		_burn(account, amount);
	}
	
  function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        if (msg.sender == minter) {
            _transfer(sender, recipient, amount);
            return true;
        }
        
        super.transferFrom(sender, recipient, amount);
       return true;
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://1774e60513f8e3e516176d902991aac0b6f1e622e07ebcc6972108a6161511f7
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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