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0x777fD20c983d6658c1D50b3958B3A1733d1cd1E1
 

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PUBLISH (NEWS) (@$0.0001)
Transaction Hash
Method
Block
From
To
Approve216104822025-01-12 19:24:4727 days ago1736709887IN
PUBLISH Protocol: NEWS Token
0 ETH0.000052632.00114594
Transfer213837642024-12-12 3:33:4759 days ago1733974427IN
PUBLISH Protocol: NEWS Token
0 ETH0.0010125718.4027877
Transfer213703182024-12-10 6:29:1161 days ago1733812151IN
PUBLISH Protocol: NEWS Token
0 ETH0.000701212.7410867
Transfer213627972024-12-09 5:17:2362 days ago1733721443IN
PUBLISH Protocol: NEWS Token
0 ETH0.0004843512.76812081
Transfer213414182024-12-06 5:39:1165 days ago1733463551IN
PUBLISH Protocol: NEWS Token
0 ETH0.0004037413.30946722
Transfer213355022024-12-05 9:48:5966 days ago1733392139IN
PUBLISH Protocol: NEWS Token
0 ETH0.0011741321.33430677
Approve211194552024-11-05 5:47:3596 days ago1730785655IN
PUBLISH Protocol: NEWS Token
0 ETH0.000052652.00271746
Approve208908492024-10-04 8:05:23128 days ago1728029123IN
PUBLISH Protocol: NEWS Token
0 ETH0.000261055.64438385
Transfer207885152024-09-20 1:26:47142 days ago1726795607IN
PUBLISH Protocol: NEWS Token
0 ETH0.000390787.78474247
Transfer207883922024-09-20 1:02:11142 days ago1726794131IN
PUBLISH Protocol: NEWS Token
0 ETH0.000401237.99288284
Transfer207320522024-09-12 4:09:35150 days ago1726114175IN
PUBLISH Protocol: NEWS Token
0 ETH0.00014034.2344758
Transfer207319332024-09-12 3:45:35150 days ago1726112735IN
PUBLISH Protocol: NEWS Token
0 ETH0.000439157.9796487
Transfer206593172024-09-02 0:31:59160 days ago1725237119IN
PUBLISH Protocol: NEWS Token
0 ETH0.000080181.59727327
Transfer205979972024-08-24 10:55:23169 days ago1724496923IN
PUBLISH Protocol: NEWS Token
0 ETH0.00002790.84248561
Transfer205917672024-08-23 14:02:47169 days ago1724421767IN
PUBLISH Protocol: NEWS Token
0 ETH0.000100582.65144411
Transfer205917242024-08-23 13:54:11169 days ago1724421251IN
PUBLISH Protocol: NEWS Token
0 ETH0.000098751.79519376
Transfer205911942024-08-23 12:06:59170 days ago1724414819IN
PUBLISH Protocol: NEWS Token
0 ETH0.000073881.34286242
Transfer205911742024-08-23 12:02:59170 days ago1724414579IN
PUBLISH Protocol: NEWS Token
0 ETH0.000045581.20214348
Transfer205908522024-08-23 10:58:11170 days ago1724410691IN
PUBLISH Protocol: NEWS Token
0 ETH0.000033721.01825327
Transfer205908102024-08-23 10:49:47170 days ago1724410187IN
PUBLISH Protocol: NEWS Token
0 ETH0.000060011.09087838
Transfer205901352024-08-23 8:33:23170 days ago1724402003IN
PUBLISH Protocol: NEWS Token
0 ETH0.000055061.00048365
Transfer205891622024-08-23 5:17:11170 days ago1724390231IN
PUBLISH Protocol: NEWS Token
0 ETH0.000107612.837624
Transfer205891472024-08-23 5:14:11170 days ago1724390051IN
PUBLISH Protocol: NEWS Token
0 ETH0.000154112.80098125
Transfer205889992024-08-23 4:43:59170 days ago1724388239IN
PUBLISH Protocol: NEWS Token
0 ETH0.000034851.05227527
Transfer205889662024-08-23 4:37:23170 days ago1724387843IN
PUBLISH Protocol: NEWS Token
0 ETH0.000062111.12946716
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Contract Source Code Verified (Exact Match)

Contract Name:
NewsCoin

Compiler Version
v0.5.0+commit.1d4f565a

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-03-17
*/

// File: @openzeppelin/contracts/GSN/Context.sol

pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

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

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

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

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

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

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

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

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.5.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20Mintable}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

// File: @openzeppelin/contracts/access/Roles.sol

pragma solidity ^0.5.0;

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

// File: @openzeppelin/contracts/access/roles/MinterRole.sol

pragma solidity ^0.5.0;



contract MinterRole is Context {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor () internal {
        _addMinter(_msgSender());
    }

    modifier onlyMinter() {
        require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role");
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(_msgSender());
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20Mintable.sol

pragma solidity ^0.5.0;



/**
 * @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, MinterRole {
    /**
     * @dev See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the {MinterRole}.
     */
    function mint(address account, uint256 amount) public onlyMinter returns (bool) {
        _mint(account, amount);
        return true;
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20Capped.sol

pragma solidity ^0.5.0;


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

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

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() public view returns (uint256) {
        return _cap;
    }

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

// File: @openzeppelin/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.0;


/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @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.
     *
     * 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;
    }
}

// File: contracts/NewsCoin.sol

pragma solidity >=0.5.0;



/**
 * @title NewsCoin contract 
 */
contract NewsCoin is ERC20Capped, ERC20Detailed {
    uint noOfTokens = 9_000_000_000; // 9.0B

    // Address of news coin vault
    // The vault will have all the news coin issued.
    address internal vault;

    // Address of news coin owner
    // The owner can change admin and vault address.
    address internal owner;

    // Address of news coin admin
    // The admin can change reserve. The reserve is the amount of token
    // assigned to some address but not permitted to use.
    address internal admin;

    event OwnerChanged(address indexed previousOwner, address indexed newOwner);
    event VaultChanged(address indexed previousVault, address indexed newVault);
    event AdminChanged(address indexed previousAdmin, address indexed newAdmin);
    event ReserveChanged(address indexed _address, uint amount);

    /**
     * @dev reserved number of tokens per each address
     *
     * To limit token transaction for some period by the admin,
     * each address' balance cannot become lower than this amount
     *
     */
    mapping(address => uint) public reserves;

    /**
       * @dev modifier to limit access to the owner only
       */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
       * @dev limit access to the vault only
       */
    modifier onlyVault() {
        require(msg.sender == vault);
        _;
    }

    /**
       * @dev limit access to the admin only
       */
    modifier onlyAdmin() {
        require(msg.sender == admin);
        _;
    }

    /**
       * @dev limit access to owner or vault
       */
    modifier onlyOwnerOrVault() {
        require(msg.sender == owner || msg.sender == vault);
        _;
    }

    /**
     * @dev initialize QRC20(ERC20)
     *
     * all token will deposit into the vault
     * later, the vault, owner will be multi sign contract to protect privileged operations
     *
     * @param _symbol token symbol
     * @param _name   token name
     * @param _owner  owner address
     * @param _admin  admin address
     * @param _vault  vault address
     *
     * Cap the mintable amount to 77.7B(77,700,000,000)
     *
     */
    constructor (string memory _symbol, string memory _name, address _owner,
        address _admin, address _vault) ERC20Detailed(_name, _symbol, 9) ERC20Capped(77_700_000_000_000_000_000)
    public {
        require(bytes(_symbol).length > 0);
        require(bytes(_name).length > 0);

        owner = _owner;
        admin = _admin;
        vault = _vault;

        // mint coins to the vault
        _mint(vault, noOfTokens * (10 ** uint(decimals())));
    }

    /**
     * @dev change the amount of reserved token
     *
     * @param _address the target address whose token will be frozen for future use
     * @param _reserve  the amount of reserved token
     *
     */
    function setReserve(address _address, uint _reserve) public onlyAdmin {
        require(_reserve <= totalSupply());
        require(_address != address(0));

        reserves[_address] = _reserve;
        emit ReserveChanged(_address, _reserve);
    }

    /**
     * @dev transfer token from sender to other
     *         the result balance should be greater than or equal to the reserved token amount
     */
    function transfer(address _to, uint256 _value) public returns (bool) {
        // check the reserve
        require(balanceOf(msg.sender).sub(_value) >= reserveOf(msg.sender));
        return super.transfer(_to, _value);
    }

    /**
     * @dev change vault address
     *
     * @param _newVault new vault address
     */
    function setVault(address _newVault) public onlyOwner {
        require(_newVault != address(0));
        require(_newVault != vault);

        address _oldVault = vault;

        // change vault address
        vault = _newVault;
        emit VaultChanged(_oldVault, _newVault);
    }

    /**
     * @dev change owner address
     * @param _newOwner new owner address
     */
    function setOwner(address _newOwner) public onlyVault {
        require(_newOwner != address(0));
        require(_newOwner != owner);

        emit OwnerChanged(owner, _newOwner);
        owner = _newOwner;
    }

    /**
     * @dev change admin address
     * @param _newAdmin new admin address
     */
    function setAdmin(address _newAdmin) public onlyOwnerOrVault {
        require(_newAdmin != address(0));
        require(_newAdmin != admin);

        emit AdminChanged(admin, _newAdmin);
        admin = _newAdmin;
    }

    /**
     * @dev Transfer tokens from one address to another
     *
     * The _from's news balance should be larger than the reserved amount(reserves[_from]) plus _value.
     *
     *   NOTE: no one can tranfer from vault
     *
     */
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(_from != vault);
        require(_value <= balanceOf(_from).sub(reserves[_from]));
        return super.transferFrom(_from, _to, _value);
    }

    function getOwner() public view returns (address) {
        return owner;
    }

    function getVault() public view returns (address) {
        return vault;
    }

    function getAdmin() public view returns (address) {
        return admin;
    }

    function getOneNewsCoin() public view returns (uint) {
        return (10 ** uint(decimals()));
    }

    /**
     * @dev get the amount of reserved token
     */
    function reserveOf(address _address) public view returns (uint _reserve) {
        return reserves[_address];
    }

    /**
     * @dev get the amount reserved token of the sender
     */
    function reserve() public view returns (uint _reserve) {
        return reserves[msg.sender];
    }
}

Contract Security Audit

Contract ABI

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

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

-----Decoded View---------------
Arg [0] : _symbol (string): NEWS
Arg [1] : _name (string): PUBLISH
Arg [2] : _owner (address): 0x61eC6B298CEcC7E29481Ec88E8778B128987a07b
Arg [3] : _admin (address): 0x2c9b22CCeCF8312d6D2a991D16d35c08364d96Df
Arg [4] : _vault (address): 0x4ac9ee8fda483403535d1028beEBc612301d4609

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [2] : 00000000000000000000000061ec6b298cecc7e29481ec88e8778b128987a07b
Arg [3] : 0000000000000000000000002c9b22ccecf8312d6d2a991d16d35c08364d96df
Arg [4] : 0000000000000000000000004ac9ee8fda483403535d1028beebc612301d4609
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [6] : 4e45575300000000000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [8] : 5055424c49534800000000000000000000000000000000000000000000000000


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://9fe85377527643d756bc48ab0ecefebcb85a7913ecf06aa7c0f54d5ab2dd064e

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

PUBLISH is a digital network architecture offering blockchain technology: proprietary token rewards system, payment solution and decentralized identifier (DID) solution. PUBLISH offers a ‘plug-and-play’ tool to news publishers, to launch 'token economy’ on their applications and reward its readers.

Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.