Contract 0xb60590313975f0d98821b6cab5ea2a6d9641d7b6 1

Contract Overview

Balance:
0 GLMR

GLMR Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
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0xf95d96211177fbaecf68f018b3c0fafd9a2990a62f44692ebc4d03056aa6138fApprove45464702023-09-30 12:12:003 days 5 hrs ago0xad9ff001c23552a1b5e0b524c81a13acb8437c4f IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.006383615307
0xa0437548159ea112b287a225812e175db55809ab9b8f281a3d92c8f13e1d665aApprove45285882023-09-27 23:49:245 days 18 hrs ago0xb729973d8c89c3225daf9bc2b2f2e6805f1e641b IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005244139921
0xfdc2c968f0a03429a001ad941dcae3c4e830bcb6586c3cdbdef8305f124d41a8Approve45262122023-09-27 15:46:246 days 2 hrs ago0xdfd0f6b1bffe23bb8fb8508398ff37208bdd4db9 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.008571349472
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0xb5cc50bf1d1adabe98cfea9cfaaffbb52d4e0a09516a3bd67adfa7cf25b4cb08Transfer45260362023-09-27 15:10:066 days 2 hrs ago0xc9ab15047c9a131e5c1b567fa11e2cd7cfd97dd2 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.010356073654
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0x485bc5028deabc8aed1ce8d4aefd150712df5bfc8b564a2dc3ceb10b89d4ee2eApprove45122272023-09-25 16:25:368 days 1 hr ago0xa6413dae11e2a4d89d6001e4d2024a55b317330f IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.0735193333
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0x95cae3c105720ce153a38472b20df76a1855a6d3a759fe121027a5befbd59172Approve45092752023-09-25 6:22:428 days 11 hrs ago0x081ca6de70660181a40e096fcecef2781cd7cb8e IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.016227588
0x25b53d30fc73d65a0765d59a3d7680cefed7388e1e05be95b77663c20a450420Approve45077882023-09-25 1:14:308 days 16 hrs ago0xf546ae60b539ac445e46b55ad16267b6d8694fa5 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.007857885471
0x6e94ffd0fb08d8b3631d225a40fedcdaa4ae1e22378533b0e58a6f41678d6063Approve45069222023-09-24 22:17:248 days 19 hrs ago0x1a70ffa8b662f8e3a121516e7610a565ef6e2e62 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005696737825
0xaec712eac298d7e30a6041b578530badf23c1add1a9c4319487fad5decd314bdApprove45069212023-09-24 22:17:128 days 19 hrs ago0x1a70ffa8b662f8e3a121516e7610a565ef6e2e62 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005696498376
0x76336ecd756bab6b4a0d72bd816ea2b5cc7d8187a1225b8665f6521a1be10f34Approve45069212023-09-24 22:17:128 days 19 hrs ago0x1a70ffa8b662f8e3a121516e7610a565ef6e2e62 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005696498376
0x9ae106cae90795dd5df03e561943abc65265193d2e886dc2092a33b46bb3eae8Approve45060132023-09-24 19:13:008 days 22 hrs ago0xbc24439b7e881e1cd0220ad983ea1f326d11a376 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.006766505631
0x4bc421fc5a704864bb76d31006de155793617add66b76fe6b1302d4ef24a0b33Approve44962812023-09-23 10:11:3010 days 7 hrs ago0x03d6968f256d052e9e7777361c3ae4bd266088af IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005237071582
0xd83421aee063d9bd8c5994bcac436c87c0e395e2cc8265231f5a90b60709d3adTransfer44912162023-09-22 17:05:3611 days 55 mins ago0xc651fbda9adfeb1212388599195b5adc4acc1149 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005658781433
0x28af30abf357157c885458dfeafdbfa3725b52dc4a65fd00dfb79bcd85240e7dApprove44849112023-09-21 19:38:3011 days 22 hrs ago0xf7bbf69f7878cedc9a223f9949ef8c72029409e6 IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005280902354
0xd3fe95eed57fb7cdafa5ee5955eadb2fa1da136d30716f3e196c47e89804e548Approve44568542023-09-17 20:52:3015 days 21 hrs ago0xb0477a50cafe4ce6d3f8f64a81cde4f42963755a IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005358242538
0x1dc3ce7cd7b60d594feb5dfec814d0a78797528bd5c88a09e706bf3bf651389dApprove44561202023-09-17 18:24:1215 days 23 hrs ago0xb729973d8c89c3225daf9bc2b2f2e6805f1e641b IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.005237
0x5e3b9b1181559117f506bee41ef1a205b7c256dcf64be01288f5eeb1419a9d40Approve44204922023-09-12 18:17:4220 days 23 hrs ago0x91ff830fbdacf0adc58d5f1871e3b3f9b1f611dc IN  0xb60590313975f0d98821b6cab5ea2a6d9641d7b60 GLMR0.006074717989
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Contract Source Code Verified (Exact Match)

Contract Name:
MscpToken

Compiler Version
v0.6.7+commit.b8d736ae

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 6 : MscpToken.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.6.7;

import "./../openzeppelin/contracts/access/Ownable.sol";
import "./../openzeppelin/contracts/GSN/Context.sol";
import "./../openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./../openzeppelin/contracts/math/SafeMath.sol";
import "./../openzeppelin/contracts/utils/Address.sol";

/// @title Official token of Moonscape ecosystem.
/// @author Nejc Schneider
/// @notice Use Moonscape in the game to obtain the premium resource MoonDust.
/// @dev Implementation of the {IERC20} interface.
contract MscpToken is Context, IERC20, Ownable {
    using SafeMath for uint256;
    using Address for address;

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

    uint256 private _totalSupply;

    string private constant _name = "Moonscape";
    string private constant _symbol = "MSCP";
    uint8 private immutable _decimals = 18;

    uint256 private constant SCALER = 10 ** 18;

    /// @notice Maximum possible supply of this token.
    uint256 public limitSupply = 1111111111000000000000000000; /// 1.1 billion

    /// @notice Set to false to stop mint/burn of token. Set to true to allow minting.
    bool public bridgeAllowed = false;

    /// @notice the list of bridge addresses allowed to mint tokens.
    mapping(address => bool) public bridges;

    // Mint and Burn
    modifier onlyBridge {
        require(bridgeAllowed && bridges[msg.sender]);
        _;
    }

    event AddBridge(address indexed bridge);
    event RemoveBridge(address indexed bridge);

    /**
     * @dev Sets the {name} and {symbol} of token.
     * Initializes {decimals} with a default value of 18.
     * Mints all tokens.
     * Transfers ownership to another account. So, the token creator will not be counted as an owner.
     */
    constructor () public {
    }

   function addBridge(address _bridge) external onlyOwner returns(bool) {
        require(_bridge != address(0), "invalid address");
        require(!bridges[_bridge], "bridge already added");

        bridges[_bridge] = true;

        emit AddBridge(_bridge);
   }

    function removeBridge(address _bridge) external onlyOwner returns(bool) {
       require(_bridge != address(0), "invalid address");
       require(bridges[_bridge], "bridge already removed");

       bridges[_bridge] = false;

       emit RemoveBridge(_bridge);
   }

   /**
     * @dev Creates `amount` new tokens for `to`.
     *
     * See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 amount) external onlyBridge {
        require(_totalSupply.add(amount) <= limitSupply, "exceeded mint limit");
        _mint(to, amount);
    }

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     *
     * Included just to follow the standard of OpenZeppelin.
     */
    function burn(uint256 amount) public {
        require(false, "Only burnFrom is allowed");
    }

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

        _approve(account, _msgSender(), currentAllowance
            .sub(amount, "transfer amount exceeds allowance"));
        _burn(account, amount);
    }

    function toggleBridgeAllowance() external onlyOwner {
        bridgeAllowed = !bridgeAllowed;
    }

    /**
     * @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`).
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _getBalance(account);
    }

    /**
     * @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) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @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) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @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) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @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)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()]
            .sub(amount, "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, "cant decrease 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), "cant transfer from zero address");
        require(recipient != address(0), "cant transfer to zero address");
        require(amount > 0, "Cant send 0 token");
        require(_getBalance(sender) >= amount, "not enough token to send");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] =  _balances[sender].sub(amount);
        _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), "cant mint to invalid 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), "cant burn from the zero address");

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "burn amount exceeds balance");
        _balances[account] = accountBalance.sub(amount);
        _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 virtual {
        require(owner != address(0), "cant approve from zero address");
        require(spender != address(0), "cant approve to zero address");

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

    /**
     * @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 { }

    /**
     * @dev Returns actual balance of account as a sum of owned divends and current balance.
     * @param account Address of Token holder.
     * @return Token amount
     */
    function _getBalance(address account) private view returns (uint256) {
        return _balances[account];
    }

}

File 2 of 6 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 3 of 6 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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 4 of 6 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

File 5 of 6 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";
/**
 * @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.
 */
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @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(_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 6 of 6 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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;
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract ABI

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utability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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