Contract 0xdDF7Fd345D54ff4B40079579d4C4670415DbfD0A 3

 

Contract Overview

SocialGood: SG Token
Balance:
0 Ether

EtherValue:
$0.00

Token:
 
Txn Hash
Method
Block
From
To
Value
0x0e4575b78c74aae5cfec8ba4a0d32a9ffb740a5e4bacbbbb8fdc3648ec135af7Transfer(pending)2022-12-03 19:48:073 hrs 37 mins ago0x715bb22079e0c11ccaa76d9bacc9c82229a58f08 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0x87244d34068e637f2a6679cf2224f58021e2145e4d70b3accf3f0fcb8f8bdc7dTransfer(pending)2022-12-03 19:48:073 hrs 37 mins ago0x715bb22079e0c11ccaa76d9bacc9c82229a58f08 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0x040e00a32ada09c3df1da79adc59c6bcc90a6fa8d8b47f65d39ec657902fbcf4Transfer(pending)2022-12-03 19:33:573 hrs 51 mins ago0xf1f13eedf09dba59e0b420cd21c1c57107abb3b6 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0xeb9df10a6b6165e573a78fb3770d3a2646b8fd1fcb9e2626ca73d054a001b3f6Approve(pending)2022-11-29 10:17:584 days 13 hrs ago0xf1f13eedf09dba59e0b420cd21c1c57107abb3b6 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0x748bc6c18d0d05bfb6158d5ceeec888f3744ba489b98319d6b367e704297fb03Transfer(pending)2022-11-27 3:15:086 days 20 hrs ago0xf1f13eedf09dba59e0b420cd21c1c57107abb3b6 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0xf976f422b6e82b0ce0277a7609b7dd3eddf46261a3b01bada399b291664c2a0eTransfer(pending)2022-11-27 3:15:086 days 20 hrs ago0xf1f13eedf09dba59e0b420cd21c1c57107abb3b6 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0x4b2887cd6ccff6d73fc7ec30f7c37133901d180c3480465dfabff4826c462866Transfer(pending)2022-11-27 3:15:086 days 20 hrs ago0xf1f13eedf09dba59e0b420cd21c1c57107abb3b6 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0xa2ceb0fe9112c2d55f7964178416481d3d7722b82b273308703c3f8749b5e871Transfer(pending)2022-11-27 3:15:086 days 20 hrs ago0xf1f13eedf09dba59e0b420cd21c1c57107abb3b6 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0xaae9221352d099813d742a6d9586200c2d5c47179bd4c71a30fc9b8064d93c71Approve(pending)2022-11-27 3:03:386 days 20 hrs ago0x5a7f84e7ced996530b83f61a589237617d8d4bbf IN SocialGood: SG Token0 Ether(Pending)(Pending)
0xf27635af5aaf55e9a79dfb06d1c297d8b455f9c9dc2389cb7567c6355d27bd79Approve(pending)2022-11-27 2:01:066 days 21 hrs ago0xed055b20acd3cc59a983d044fe04a194e396d407 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0x319dd92a2d7dca00b2c709ac1a2faa5909a17cfcea0b50dd50dc7ab855945fbaTransfer(pending)2022-11-27 1:50:286 days 21 hrs ago0x2e39250c39bb78b02d1182f46e309633fc3901b3 IN SocialGood: SG Token0 Ether(Pending)(Pending)
0xda638fb6a3a9037bef3af6976447811194df8d1a860f18ac113129153191cb9eTransfer161074642022-12-03 23:07:2317 mins ago0x1785ee8dd9e22f14e7d538b32c505905cfde3eb2 IN  SocialGood: SG Token0 Ether0.0005588515.2210083
0x1b3a60a4441065d83d40f605d1a308ee3f44967fa3660b363864f087fbad93baTransfer161072072022-12-03 22:15:471 hr 9 mins ago0xad6e5c43cefe5cea60cb5f58782c5f8f1607a5ca IN  SocialGood: SG Token0 Ether0.00066474 12.35487488
0x37e738dfd83e00a55afb128e15d0e842347791852657ed1c709539f334abab5eTransfer161071382022-12-03 22:01:591 hr 23 mins ago0x1785ee8dd9e22f14e7d538b32c505905cfde3eb2 IN  SocialGood: SG Token0 Ether0.0008530215.8542741
0x07218be4946acd0d02d97ca8a9fa636a03150e8a2cedf33fd0dd7abd21a286eeTransfer161068002022-12-03 20:54:232 hrs 30 mins ago0xe152416038f01f0cbfb28b3e133b039f4f80355d IN  SocialGood: SG Token0 Ether0.00043998 11.98741818
0xe75b8545a5400528e596373572a63481507ae50551a750d3044514ecf2e895f3Transfer161067982022-12-03 20:53:592 hrs 31 mins ago0x1785ee8dd9e22f14e7d538b32c505905cfde3eb2 IN  SocialGood: SG Token0 Ether0.0005530415.0628532
0x54bb3ed77357638e2111c006d1eecb93f25a0e8e5d54ecc0fff4eb643e6ae45eApprove161067562022-12-03 20:45:352 hrs 39 mins agoENS Name krypteusz.eth IN  SocialGood: SG Token0 Ether0.00071321 14.64722679
0x5db8a394a1a7513997e6780e6c35785130ebfcbb35c33ab5bf8d1265c82e562aTransfer161067422022-12-03 20:42:472 hrs 42 mins ago0x1785ee8dd9e22f14e7d538b32c505905cfde3eb2 IN  SocialGood: SG Token0 Ether0.0007005919.08142016
0x705593e3cb72b3ea400859b7d4919ffc32a87eff053f3f75176618598d1241ccTransfer161066992022-12-03 20:34:112 hrs 51 mins ago0x1785ee8dd9e22f14e7d538b32c505905cfde3eb2 IN  SocialGood: SG Token0 Ether0.0006721118.30574362
0x0d4e1bee075efa2bc3b08dc99c4a4521765e2427a7d310dc82df481ac3919c5fApprove161066772022-12-03 20:29:472 hrs 55 mins ago0x8f4636b47375dc59dcdf719b15e7daab600dde30 IN  SocialGood: SG Token0 Ether0.0005833 11.97922436
0x7a726ded409ff3536964060d517759e691d5026fe5c49ff1b519f9da4c0a98ceTransfer161066552022-12-03 20:25:232 hrs 59 mins ago0x3a94c6f7816e7d5e188d6e03e59c27c5fc001314 IN  SocialGood: SG Token0 Ether0.00038892 12.1859817
0x169551972aff83fdb57b29cc85599b701aadc0a44a56e4a625d3939c70ab3ab7Transfer161066092022-12-03 20:16:113 hrs 9 mins agoMEXC: Mexc.com IN  SocialGood: SG Token0 Ether0.0010763220
0x1790fc2554662463d37ab75582cdd7ea382e067830acf51a6eff9ae16bfbcd5bTransfer161065842022-12-03 20:11:113 hrs 14 mins ago0x3ab28ecedea6cdb6feed398e93ae8c7b316b1182 IN  SocialGood: SG Token0 Ether0.00047345 12.9035011
0xfce0da58df20b290be3b364d834ed7f9002ff4fa62780103ada9cf9ab257eb13Approve161065672022-12-03 20:07:473 hrs 17 mins ago0xf5c47a443de546129a61c1681f6995c5604a1376 IN  SocialGood: SG Token0 Ether0.00055312 11.35952152
0x02724530407eae766dd8b803e1fd54d3027afb8d1359e2f8f3b89ecdee459f87Transfer161065512022-12-03 20:04:353 hrs 20 mins ago0x2a58f01b8b025afdbaaab76f9fec57e73fcd3abb IN  SocialGood: SG Token0 Ether0.00036703 11.5
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OVERVIEW

A project claims to provide crypto point return service for shopping at retail stores, with patents.

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Contract Source Code Verified (Exact Match)

Contract Name:
SocialGoodToken

Compiler Version
v0.5.17+commit.d19bba13

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-07-20
*/

pragma solidity 0.5.17;


/**
 * @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
    );
}

/**
 * @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;
    }
}

/**
 * @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 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(msg.sender, 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(msg.sender, 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,
            msg.sender,
            _allowances[sender][msg.sender].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(
            msg.sender,
            spender,
            _allowances[msg.sender][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(
            msg.sender,
            spender,
            _allowances[msg.sender][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,
            msg.sender,
            _allowances[account][msg.sender].sub(
                amount,
                "ERC20: burn amount exceeds allowance"
            )
        );
    }
}

/**
 * @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.
 *
 * 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.
 */
contract Ownable {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @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(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _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 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Ownable {
    /**
     * @dev Emitted when the pause is triggered by a pauser (`account`).
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by a pauser (`account`).
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state. Assigns the Pauser role
     * to the deployer.
     */
    constructor() internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Called by a pauser to pause, triggers stopped state.
     */
    function pause() public onlyOwner whenNotPaused {
        _paused = true;
        emit Paused(msg.sender);
    }

    /**
     * @dev Called by a pauser to unpause, returns to normal state.
     */
    function unpause() public onlyOwner whenPaused {
        _paused = false;
        emit Unpaused(msg.sender);
    }
}

/**
 * @title Pausable token
 * @dev ERC20 with pausable transfers and allowances.
 *
 * Useful if you want to stop trades until the end of a crowdsale, or have
 * an emergency switch for freezing all token transfers in the event of a large
 * bug.
 */
contract ERC20Pausable is ERC20, Pausable {
    function transfer(address to, uint256 value)
        public
        whenNotPaused
        returns (bool)
    {
        return super.transfer(to, value);
    }

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) public whenNotPaused returns (bool) {
        return super.transferFrom(from, to, value);
    }

    function approve(address spender, uint256 value)
        public
        whenNotPaused
        returns (bool)
    {
        return super.approve(spender, value);
    }

    function increaseAllowance(address spender, uint256 addedValue)
        public
        whenNotPaused
        returns (bool)
    {
        return super.increaseAllowance(spender, addedValue);
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        whenNotPaused
        returns (bool)
    {
        return super.decreaseAllowance(spender, subtractedValue);
    }
}

/**
 * @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).
 */
contract ERC20Burnable is ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public {
        _burn(msg.sender, amount);
    }

    /**
     * @dev See {ERC20-_burnFrom}.
     */
    function burnFrom(address account, uint256 amount) public {
        _burnFrom(account, amount);
    }
}

/**
 * @dev Extension of {ERC20} that adds a set of accounts with the {MinterRole},
 * which have permission to mint (create) new tokens as they see fit.
 *
 * At construction, the deployer of the contract is the only minter.
 */
contract ERC20Mintable is ERC20, Ownable {
    /**
     * @dev See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the {MinterRole}.
     */
    function mint(address account, uint256 amount)
        public
        onlyOwner
        returns (bool)
    {
        _mint(account, amount);
        return true;
    }
}

/**
 * @dev Extension of {ERC20Mintable} that adds a cap to the supply of tokens.
 */
contract ERC20Capped is ERC20Mintable {
    uint256 private _cap;
    uint256 private _capUsed;

    uint256 private _airdropCap;
    uint256 private _airdropCapUsed;

    /**
     * @dev Sets the value of the `cap`. This value is immutable, it can only be
     * set once during construction.
     */
    constructor(uint256 cap, uint256 airdropCap) public {
        require(cap != 0, "ERC20Capped: cap is 0");
        require(airdropCap != 0, "ERC20Capped: airdrop cap is 0");
        _cap = cap;
        _airdropCap = airdropCap;
    }

    /**
     * @dev Returns the normal cap.
     */
    function cap() public view returns (uint256) {
        return _cap;
    }

    /**
     * @dev Returns the airdrop cap.
     */
    function airdropCap() public view returns (uint256) {
        return _airdropCap;
    }

    /**
     * @dev Returns the normal cap used.
     */
    function capUsed() public view returns (uint256) {
        return _capUsed;
    }

    /**
     * @dev Returns the airdrop cap used.
     */
    function airdropCapUsed() public view returns (uint256) {
        return _airdropCapUsed;
    }

    /**
     * @dev See {ERC20Mintable-mint}.
     *
     * Requirements:
     *
     * - `value` must not cause the cap used to go over the cap.
     */
    function _mint(address account, uint256 value) internal {
        uint256 newCapUsed = _capUsed.add(value);
        require(newCapUsed <= _cap, "ERC20Capped: cap exceeded");
        super._mint(account, value);
        _capUsed = newCapUsed;
    }

    /**
     * @dev See {ERC20Mintable-mint}.
     *
     * Requirements:
     *
     * - `value` must not cause the airdrop cap used to go over the airdrop cap.
     */
    function _airdropMint(address account, uint256 value) internal {
        super._mint(account, value);
    }

    /**
     * @dev Used for increasing the airdrop cap used when owner lockup the token.
     *
     * Requirements:
     *
     * - `value` must not cause the airdrop cap used to go over the cap.
     */
    function _incrementUsedAirdropCap(uint256 value) internal {
        uint256 newAirdropCapUsed = _airdropCapUsed.add(value);
        require(
            newAirdropCapUsed <= _airdropCap,
            "ERC20Capped: airdrop cap exceeded"
        );
        _airdropCapUsed = newAirdropCapUsed;
    }
}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract SocialGoodToken is
    ERC20Pausable,
    ERC20Burnable,
    ERC20Mintable,
    ERC20Capped
{
    string private constant _name = "SocialGood";
    string private constant _symbol = "SG";
    uint8 private constant _decimals = 18;

    // set maximum token normal hard cap
    uint256 private constant NORMAL_HARD_CAP = 209250000e18; // 209,250,000 SG
    // set maximum token airdrop hard cap
    uint256 private constant AIRDROP_HARD_CAP = 750000e18; // 750,000 SG

    mapping(address => uint256) private _lockupAmounts;

    constructor() public ERC20Capped(NORMAL_HARD_CAP, AIRDROP_HARD_CAP) {}

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

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

    function getAddressLockupAmount(address _account)
        public
        view
        returns (uint256)
    {
        return _lockupAmounts[_account];
    }

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

    /**
     * @dev See {ERC20-_burnFrom}.
     */
    function burnFrom(address account, uint256 amount) public onlyOwner {
        _burnFrom(account, amount);
    }

    /**
     * @dev Used for validating inputs before execute lockup
     */
    function _preValidateAirdrop(address _account, uint256 _amount)
        internal
        pure
    {
        require(
            _account != address(0),
            "SocialGoodToken: airdrop target address is empty"
        );
        require(_amount != 0, "SocialGoodToken: amount is zero");
    }

    /**
     * @dev Used for migrating old SG token to new SG token.
     * The token amount will be locked until the owner unlock it manually.
     */
    function airdropLockup(
        address[] calldata _accounts,
        uint256[] calldata _amounts
    ) external onlyOwner whenNotPaused {
        require(
            _accounts.length == _amounts.length,
            "SocialGoodToken: the length of accounts, amounts are not the same"
        );
        uint256 length = _accounts.length;
        for (uint256 i = 0; i != length; i++) {
            _preValidateAirdrop(_accounts[i], _amounts[i]);
            _lockup(_accounts[i], _amounts[i]);
        }
    }

    /**
     * @dev Used for locking up token amount of any address.
     * This is an internal function, only called from the owner's airdropLockup function.
     */
    function _lockup(address _account, uint256 _amount) internal {
        _lockupAmounts[_account] = _lockupAmounts[_account].add(_amount);
        _incrementUsedAirdropCap(_amount);
    }

    /**
     * @dev Used for unlocking token when migrating from old SG token to new SG token.
     * The token amount will be minted to selected addresses up to the token issue limit.
     * Data will be read from _lockupAmounts and reset to zero after token is minted.
     */
    function unlocks(address[] calldata _accounts)
        external
        onlyOwner
        whenNotPaused
    {
        uint256 length = _accounts.length;
        for (uint256 i = 0; i != length; i++) {
            _unlock(_accounts[i]);
        }
    }

    function _unlock(address _account) internal {
        require(
            _lockupAmounts[_account] != 0,
            "SocialGoodToken: amount is zero"
        );
        _airdropMint(_account, _lockupAmounts[_account]);
        _lockupAmounts[_account] = 0;
    }
}

Contract Security Audit

Contract ABI

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Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.