ETH Price: $3,336.42 (-1.15%)
Gas: 8 Gwei

Contract

0x8a7a5991aAf142B43E58253Bd6791e240084F0A9
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
0x60806040133712562021-10-07 10:29:111027 days ago1633602551IN
 Create: BottoGovernance
0 ETH0.09651312120

View more zero value Internal Transactions in Advanced View mode

Advanced mode:
Loading...
Loading

Contract Source Code Verified (Exact Match)

Contract Name:
BottoGovernance

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 8 : BottoGovernance.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@uniswap/lib/contracts/libraries/TransferHelper.sol";

/// @title Eleven-Yellow BOTTO governance service
/// @notice Staked BOTTO tokens represent a weighting for influence on governance issues
contract BottoGovernance is OwnableUpgradeable {
    using SafeMath for uint256;

    address public botto;
    uint256 public totalStaked;
    mapping(address => uint256) public userStakes;

    event Staked(address indexed staker, uint256 amount);
    event Unstaked(address indexed staker, uint256 amount);
    event RecoveryTransfer(address token, uint256 amount, address recipient);

    /// @param botto_ ERC20 contract address of BOTTO token
    /// @dev BOTTO token contract address is initialized
    function initialize(address botto_) public initializer {
        __Ownable_init();
        botto = botto_;
    }

    /// @notice Stake BOTTO tokens for governance purposes
    /// @param amount_ the amount of BOTTO tokens to stake
    /// @dev Stake requires approval for governance contract to transfer & hold BOTTO tokens
    function stake(uint256 amount_) public virtual {
        require(amount_ > 0, "Invalid amount");
        userStakes[msg.sender] = userStakes[msg.sender].add(amount_);
        IERC20(botto).transferFrom(msg.sender, address(this), amount_);
        totalStaked = totalStaked.add(amount_);
        emit Staked(msg.sender, amount_);
    }

    /// @notice Unstake previously staked tokens
    /// @dev Existing token stake is transferred back to owner
    function unstake() public virtual {
        uint256 amount = userStakes[msg.sender];
        require(amount > 0, "No existing stake");
        userStakes[msg.sender] = 0;
        totalStaked = totalStaked.sub(amount);
        IERC20(botto).transfer(msg.sender, amount);
        emit Unstaked(msg.sender, amount);
    }

    /// @notice Sweeps excess tokens to a specified recipient address
    /// @param token_ address of token to recover
    /// @param recipient_ payable address for token beneficiary
    /// @dev Total token balance is recovered; only excess non-staked tokens in case of BOTTO
    function recover(address token_, address payable recipient_)
        public
        virtual
        onlyOwner
    {
        uint256 _balance = IERC20(token_).balanceOf(address(this));

        if (token_ == botto) {
            _balance = _balance.sub(totalStaked);
        }

        TransferHelper.safeTransfer(token_, recipient_, _balance);
        emit RecoveryTransfer(token_, _balance, recipient_);
    }
}

File 2 of 8 : TransferHelper.sol
// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.6.0;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}

File 3 of 8 : IERC20.sol
// SPDX-License-Identifier: MIT

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 4 of 8 : SafeMath.sol
// SPDX-License-Identifier: MIT

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 5 of 8 : ContextUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/*
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    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;
    }
    uint256[50] private __gap;
}

File 6 of 8 : AddressUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @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");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        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 7 of 8 : Initializable.sol
// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;

import "../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

File 8 of 8 : OwnableUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.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.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        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;
    }
    uint256[49] private __gap;
}

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

Contract Security Audit

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"}],"name":"RecoveryTransfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Unstaked","type":"event"},{"inputs":[],"name":"botto","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"botto_","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token_","type":"address"},{"internalType":"address payable","name":"recipient_","type":"address"}],"name":"recover","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount_","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalStaked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userStakes","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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

Deployed Bytecode

0x608060405234801561001057600080fd5b506004361061009e5760003560e01c80638da7ad23116100665780638da7ad2314610121578063a694fc3a14610147578063c4d66de814610164578063cad92a4b1461018a578063f2fde38b146101925761009e565b80632def6620146100a3578063648bf774146100ad578063715018a6146100db578063817b1cd2146100e35780638da5cb5b146100fd575b600080fd5b6100ab6101b8565b005b6100ab600480360360408110156100c357600080fd5b506001600160a01b03813581169160200135166102e7565b6100ab61045a565b6100eb610518565b60408051918252519081900360200190f35b61010561051e565b604080516001600160a01b039092168252519081900360200190f35b6100eb6004803603602081101561013757600080fd5b50356001600160a01b031661052d565b6100ab6004803603602081101561015d57600080fd5b503561053f565b6100ab6004803603602081101561017a57600080fd5b50356001600160a01b031661067f565b610105610745565b6100ab600480360360208110156101a857600080fd5b50356001600160a01b0316610754565b336000908152606760205260409020548061020e576040805162461bcd60e51b81526020600482015260116024820152704e6f206578697374696e67207374616b6560781b604482015290519081900360640190fd5b3360009081526067602052604081205560665461022b9082610869565b6066556065546040805163a9059cbb60e01b81523360048201526024810184905290516001600160a01b039092169163a9059cbb916044808201926020929091908290030181600087803b15801561028257600080fd5b505af1158015610296573d6000803e3d6000fd5b505050506040513d60208110156102ac57600080fd5b505060408051828152905133917f0f5bb82176feb1b5e747e28471aa92156a04d9f3ab9f45f28e2d704232b93f75919081900360200190a250565b6102ef6108c6565b6001600160a01b031661030061051e565b6001600160a01b03161461035b576040805162461bcd60e51b815260206004820181905260248201527f4f776e61626c653a2063616c6c6572206973206e6f7420746865206f776e6572604482015290519081900360640190fd5b6000826001600160a01b03166370a08231306040518263ffffffff1660e01b815260040180826001600160a01b0316815260200191505060206040518083038186803b1580156103aa57600080fd5b505afa1580156103be573d6000803e3d6000fd5b505050506040513d60208110156103d457600080fd5b50516065549091506001600160a01b0384811691161415610400576066546103fd908290610869565b90505b61040b8383836108ca565b604080516001600160a01b0380861682526020820184905284168183015290517f996808f206844561ab15563a6bef55ef199bcf1a5280d770271b29c012a3cfef9181900360600190a1505050565b6104626108c6565b6001600160a01b031661047361051e565b6001600160a01b0316146104ce576040805162461bcd60e51b815260206004820181905260248201527f4f776e61626c653a2063616c6c6572206973206e6f7420746865206f776e6572604482015290519081900360640190fd5b6033546040516000916001600160a01b0316907f8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0908390a3603380546001600160a01b0319169055565b60665481565b6033546001600160a01b031690565b60676020526000908152604090205481565b60008111610585576040805162461bcd60e51b815260206004820152600e60248201526d125b9d985b1a5908185b5bdd5b9d60921b604482015290519081900360640190fd5b3360009081526067602052604090205461059f9082610a1d565b3360008181526067602090815260408083209490945560655484516323b872dd60e01b815260048101949094523060248501526044840186905293516001600160a01b03909416936323b872dd93606480820194918390030190829087803b15801561060a57600080fd5b505af115801561061e573d6000803e3d6000fd5b505050506040513d602081101561063457600080fd5b50506066546106439082610a1d565b60665560408051828152905133917f9e71bc8eea02a63969f509818f2dafb9254532904319f9dbda79b67bd34a5f3d919081900360200190a250565b600054610100900460ff16806106985750610698610a7e565b806106a6575060005460ff16155b6106e15760405162461bcd60e51b815260040180806020018281038252602e815260200180610d07602e913960400191505060405180910390fd5b600054610100900460ff1615801561070c576000805460ff1961ff0019909116610100171660011790555b610714610a8f565b606580546001600160a01b0319166001600160a01b0384161790558015610741576000805461ff00191690555b5050565b6065546001600160a01b031681565b61075c6108c6565b6001600160a01b031661076d61051e565b6001600160a01b0316146107c8576040805162461bcd60e51b815260206004820181905260248201527f4f776e61626c653a2063616c6c6572206973206e6f7420746865206f776e6572604482015290519081900360640190fd5b6001600160a01b03811661080d5760405162461bcd60e51b8152600401808060200182810382526026815260200180610ce16026913960400191505060405180910390fd5b6033546040516001600160a01b038084169216907f8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e090600090a3603380546001600160a01b0319166001600160a01b0392909216919091179055565b6000828211156108c0576040805162461bcd60e51b815260206004820152601e60248201527f536166654d6174683a207375627472616374696f6e206f766572666c6f770000604482015290519081900360640190fd5b50900390565b3390565b604080516001600160a01b038481166024830152604480830185905283518084039091018152606490920183526020820180516001600160e01b031663a9059cbb60e01b1781529251825160009485949389169392918291908083835b602083106109465780518252601f199092019160209182019101610927565b6001836020036101000a0380198251168184511680821785525050505050509050019150506000604051808303816000865af19150503d80600081146109a8576040519150601f19603f3d011682016040523d82523d6000602084013e6109ad565b606091505b50915091508180156109db5750805115806109db57508080602001905160208110156109d857600080fd5b50515b610a165760405162461bcd60e51b815260040180806020018281038252602d815260200180610d35602d913960400191505060405180910390fd5b5050505050565b600082820183811015610a77576040805162461bcd60e51b815260206004820152601b60248201527f536166654d6174683a206164646974696f6e206f766572666c6f770000000000604482015290519081900360640190fd5b9392505050565b6000610a8930610b41565b15905090565b600054610100900460ff1680610aa85750610aa8610a7e565b80610ab6575060005460ff16155b610af15760405162461bcd60e51b815260040180806020018281038252602e815260200180610d07602e913960400191505060405180910390fd5b600054610100900460ff16158015610b1c576000805460ff1961ff0019909116610100171660011790555b610b24610b47565b610b2c610be7565b8015610b3e576000805461ff00191690555b50565b3b151590565b600054610100900460ff1680610b605750610b60610a7e565b80610b6e575060005460ff16155b610ba95760405162461bcd60e51b815260040180806020018281038252602e815260200180610d07602e913960400191505060405180910390fd5b600054610100900460ff16158015610b2c576000805460ff1961ff0019909116610100171660011790558015610b3e576000805461ff001916905550565b600054610100900460ff1680610c005750610c00610a7e565b80610c0e575060005460ff16155b610c495760405162461bcd60e51b815260040180806020018281038252602e815260200180610d07602e913960400191505060405180910390fd5b600054610100900460ff16158015610c74576000805460ff1961ff0019909116610100171660011790555b6000610c7e6108c6565b603380546001600160a01b0319166001600160a01b038316908117909155604051919250906000907f8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0908290a3508015610b3e576000805461ff00191690555056fe4f776e61626c653a206e6577206f776e657220697320746865207a65726f2061646472657373496e697469616c697a61626c653a20636f6e747261637420697320616c726561647920696e697469616c697a65645472616e7366657248656c7065723a3a736166655472616e736665723a207472616e73666572206661696c6564a2646970667358221220f18fe3634d6c5e855adfd173fad8506a7a67db4c30eccd59cc8727a00b20670764736f6c63430007060033

Block Transaction Difficulty Gas Used Reward
View All Blocks Produced

Block Uncle Number Difficulty Gas Used Reward
View All Uncles
Loading...
Loading
Loading...
Loading

Validator Index Block Amount
View All Withdrawals

Transaction Hash Block Value Eth2 PubKey Valid
View All Deposits
Loading...
Loading
[ Download: CSV Export  ]

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.