Contract 0x1fE24F25b1Cf609B9c4e7E12D802e3640dFA5e43 1

 
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0x7f8a6891c01430443c1922a35a956fb90d90a705940c850fe0aa8793a2c34022Approve(pending)2021-12-12 5:16:293 days 3 mins ago0x4018b5ec86dbba9303a06840c3a868b16295863b IN ChainGuardians: CGG Token0 Ether(Pending)(Pending)
0x8fc23bf0dd178f20312e10b3b53daba52fae07a069628eedb62fad82ef734d09Transfer(pending)2021-12-12 5:01:563 days 17 mins ago0xeaca207bb778de0ef606dd5066edcb65acf0cea2 IN ChainGuardians: CGG Token0 Ether(Pending)(Pending)
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0x4ff7e455af77c8e6c4e241d599fbefa535efa93793d02b6e069c025b9e504b4dTransfer(pending)2021-12-12 2:39:163 days 2 hrs ago0x6243a318cdb82189191db17192194c37999cc57e IN ChainGuardians: CGG Token0 Ether(Pending)(Pending)
0xcd5f1c1dade0cd6341f87dc19e7772b7975e69bba5ed5827ef5d6d840ccdf667Transfer(pending)2021-12-12 2:22:283 days 2 hrs ago0x5561bededdb5b62b4b4480cfc02f23cb5f95b3bc IN ChainGuardians: CGG Token0 Ether(Pending)(Pending)
0xabb509c66793896089079c0b8780caba40abeba6e054ddd31ff837ab03beb018Approve(pending)2021-12-05 8:01:439 days 21 hrs ago0x2574ad53227daf14c4f24989f7f5d9d952e4ac8b IN ChainGuardians: CGG Token0 Ether(Pending)(Pending)
0x5eb54b7f98bc620fd98dda9b0b5f5106053161d6e10d141f40c3e4933509d500Approve(pending)2021-12-05 1:20:1810 days 3 hrs ago0x2574ad53227daf14c4f24989f7f5d9d952e4ac8b IN ChainGuardians: CGG Token0 Ether(Pending)(Pending)
0xa327ce4cdf219e1fc04a130a96e3e361fa1f622dda6ea9ba4e31749cd33dd5e2Approve138077882021-12-15 5:15:254 mins ago0xae549b969dc91b022b8cf1ef2d5d5d2131ac00f7 IN  ChainGuardians: CGG Token0 Ether0.003960566309 84.985222194
0xb9acc1a77e39c37692f102eee50c832caae635cad2236db2286b28def409a07eTransfer138077582021-12-15 5:07:0412 mins ago0x9621a161cd77998bb59f5062f68b993be2f6f791 IN  ChainGuardians: CGG Token0 Ether0.004341038499 84.055349002
0x679d28281e8429d1f9dac310aa92d0a196fa9e86dabc77cf71d2daf10136b175Transfer138076982021-12-15 4:53:2626 mins ago0x5cca55a6302bdb92a17edf06aa00c8579e67ddfa IN  ChainGuardians: CGG Token0 Ether0.00238996522169.20815514
0x9099d4571c866042619d4ad2ae9c3a0af6c1a342609e7fb6beb275f4b8f55ce1Approve138076792021-12-15 4:49:5829 mins ago0x22c6e9211de7188e0f4542b3eb1915b84ca75a44 IN  ChainGuardians: CGG Token0 Ether0.003513033283 75.382127407
0x7ea224b37e7a0d4d3854e2caed2732a5717b5f301ba4e4f602ddb06bf43b069dTransfer138076082021-12-15 4:32:4546 mins ago0xd672424282da9e2ac0e80bc87486fb78af852e8a IN  ChainGuardians: CGG Token0 Ether0.003876760839 75.100459872
0xd06429306960af3bb76e792ed64ae0d6666e586806b0d1027856d36c2623e1c9Transfer138075612021-12-15 4:21:4857 mins agoKuCoin 3 IN  ChainGuardians: CGG Token0 Ether0.006586831795116.719504457
0x7dff034568facf27f3637919b17f4e0b8ce9806540d24a4e22ae310e3524046fTransfer138074392021-12-15 3:55:221 hr 24 mins ago0xfedc6e6160bd2017d5bc62ffc708a2c9ccd53bf3 IN  ChainGuardians: CGG Token0 Ether0.003397220442 65.780238996
0x6187625b52ef5d5a94bcf954d01ea51f66e67ed64828d5a6167c818403fa6720Transfer138074392021-12-15 3:55:221 hr 24 mins ago0xabd69d0fac4b0851dafe100979df808eb7fb81a9 IN  ChainGuardians: CGG Token0 Ether0.00245439971
0x11a9a2f2523f26073814004de321cb0a8637f436e818b44d30af6968ebd5e9d8Transfer138074362021-12-15 3:54:381 hr 25 mins ago0x5f0bee213e5dc3f7b7ca2a9d0b854468974802c4 IN  ChainGuardians: CGG Token0 Ether0.00293516631284.907469475
0xf5ed99b90a5e5155f021ca4c551e8b12956986543f3fe1661c80ce876e030d05Transfer138074202021-12-15 3:51:261 hr 28 mins ago0x42c7c2e56f7c5285bb6eaf284c088794280cce33 IN  ChainGuardians: CGG Token0 Ether0.00265996577
0xdd2372f445b4d3952a2e76c50d4fb12c4a3f6ac10a114beee0b2493e68d09cfdTransfer138072962021-12-15 3:27:041 hr 52 mins agoKuCoin 3 IN  ChainGuardians: CGG Token0 Ether0.006199759477109.860533326
0xdbf02c0d43867999abd0fbdaa40ba0956ddc090afa3c2ce7106f03e0067231cfTransfer138071682021-12-15 2:54:192 hrs 25 mins ago0xc0d9ccc9a445e3d5357e8b75d9ee1fd82e06e5fa IN  ChainGuardians: CGG Token0 Ether0.003865684009 74.851079663
0xefb60f9fa2b115796ae638a7350f0db64a5676191e65543cbf9864d201582852Transfer138070272021-12-15 2:20:592 hrs 58 mins agoKuCoin 3 IN  ChainGuardians: CGG Token0 Ether0.00387169860798.373824426
0xa5efb274c73a3e2fea5365511e870a4632a08d8ecf2f153845e43f615c9bb651Transfer138068952021-12-15 1:51:383 hrs 28 mins ago0x3513ef3478c0dab79c8f48bda79281fec5644bc7 IN  ChainGuardians: CGG Token0 Ether0.0029017884
0x57121f4399c03f85f9255b387ce90db0805765e50806ea6fd472e8e3bae02e1cTransfer138068952021-12-15 1:51:383 hrs 28 mins ago0xc135be012fbe5c9375044776d97baed948b0d24b IN  ChainGuardians: CGG Token0 Ether0.0029017884
0x2272217f83d9f658c0963392f70df331c5380ce4554c859fed634dc43839c31bTransfer138068902021-12-15 1:50:403 hrs 29 mins ago0x7f0e9e06dea3d58e28b3f4d1b6438b84dbf3af73 IN  ChainGuardians: CGG Token0 Ether0.004597241243 89.036880365
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OVERVIEW

ChainGuardians is a platform which combines traditional gaming concepts with blockchain technologies to enable player-driven economies.

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Contract Source Code Verified (Exact Match)

Contract Name:
CGGToken

Compiler Version
v0.7.4+commit.3f05b770

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-03-05
*/

// SPDX-License-Identifier: MIT

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: contracts\lib\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: contracts\lib\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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

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

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

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

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

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

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

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

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

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

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

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

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

// File: contracts\lib\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_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

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

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

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

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

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

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

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

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

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

// File: contracts\lib\access\Ownable.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

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

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts\Freezable\Freezable.sol


pragma solidity ^0.7.0;

//import "@openzeppelin/contracts/utils/Context.sol";

/*
** usage:
**   require(!isFrozen(_account), "Freezable: frozen");
** or
**   modifier: whenAccountNotFrozen(address _account)
** or 
**   require(!freezes[_from], "From account is locked.");
*/
//abstract contract Freezable is Context {
abstract contract Freezable {
    event Frozen(address account);
    event Unfrozen(address account);
    mapping(address => bool) internal freezes;


    function isFrozen(address _account) public view virtual returns (bool) {
        return freezes[_account];
    }

    modifier whenAccountNotFrozen(address _account) {
        require(!isFrozen(_account), "Freezable: frozen");
        _;
    }

    modifier whenAccountFrozen(address _account) {
        require(isFrozen(_account), "Freezable: not frozen");
        _;
    }
 
}

// File: contracts\ERC677\IERC677.sol


pragma solidity ^0.7.0;

//import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
//abstract contract IERC677 is IERC20 {

abstract contract IERC677 {
  function transferAndCall(address to, uint value, bytes memory data) public virtual returns (bool success);

  event Transfer(address indexed from, address indexed to, uint value, bytes data);
  
}

// File: contracts\ERC677\IERC677Receiver.sol


pragma solidity ^0.7.0;

abstract contract IERC677Receiver {
  function onTokenTransfer(address _sender, uint _value, bytes memory _data) public virtual;
}

// File: contracts\CGGToken.sol


pragma solidity ^0.7.0;






/*
** CGGToken
** Standard ERC20 capabilities (Openzeppelin 3.4.0)
** Implements ERC677 transferAndCall
** Implements Freezable
*/
contract CGGToken is ERC20, Freezable, Ownable {

    constructor(uint256 initialSupply) ERC20("ChainGuardians Governance Token", "CGG") {
        _mint(msg.sender, initialSupply);
    }

    /* /////////////////////////////
    ** Freezable
    ** /////////////////////////////
    */
    function _beforeTokenTransfer(address from, address to, uint256 amount) 
        internal virtual override 
    {
        super._beforeTokenTransfer(from, to, amount);
        
        require(!isFrozen(from), "ERC20Freezable: from account is frozen");
        require(!isFrozen(to), "ERC20Freezable: to account is frozen");
    }

    function freeze(address _account) public onlyOwner {
        freezes[_account] = true;
        emit Frozen(_account);
    }

    function unfreeze(address _account) public onlyOwner {
        freezes[_account] = false;
        emit Unfrozen(_account);
    }

    /* /////////////////////////////
    ** ERC677 Transfer and call
    ** /////////////////////////////
    */
    event Transfer(address indexed from, address indexed to, uint256 value, bytes data);

    /**
    * @dev transfer token to a contract address with additional data if the recipient is a contact.
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    * @param _data The extra data to be passed to the receiving contract.
    */
    function transferAndCall(address _to, uint _value, bytes memory _data)
        public
        returns (bool success)
    {
        super.transfer(_to, _value);
        emit Transfer(msg.sender, _to, _value, _data);
        if (isContract(_to)) {
            IERC677Receiver receiver = IERC677Receiver(_to);
            receiver.onTokenTransfer(msg.sender, _value, _data);
        }
        return true;
    }

    function isContract(address _addr)
        private
        view
        returns (bool hasCode)
    {
        uint length;
        assembly { length := extcodesize(_addr) }
        return length > 0;
    }
}

Contract Security Audit

Contract ABI

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nership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"unfreeze","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

0000000000000000000000000000000000000000006342fd08f00f6378000000

-----Decoded View---------------
Arg [0] : initialSupply (uint256): 120000000000000000000000000

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000006342fd08f00f6378000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://0f68589fb1141e4a08b5603f906ac7b368b4be4d5306eb87d9669ce94289d951
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.