ETH Price: $2,647.54 (+1.56%)
Gas: 27.1 Gwei

Contract

0xb89494aB70001A2F25372b5E962046908188feEa
 

Overview

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0 ETH

Eth Value

$0.00

Token Holdings

Multichain Info

Transaction Hash
Method
Block
From
To
Unstake196565642024-04-14 21:50:47186 days ago1713131447IN
Flashstake: FlashBack Staking
0 ETH0.0007030910.21372277
Unstake196565602024-04-14 21:49:59186 days ago1713131399IN
Flashstake: FlashBack Staking
0 ETH0.0009157611.09777206
Unstake194803162024-03-21 3:17:35211 days ago1710991055IN
Flashstake: FlashBack Staking
0 ETH0.0021893426.53493904
Unstake192558352024-02-18 16:20:47242 days ago1708273247IN
Flashstake: FlashBack Staking
0 ETH0.0026316731.89219166
Unstake189875202024-01-12 1:23:47280 days ago1705022627IN
Flashstake: FlashBack Staking
0 ETH0.001678820.34475532
Unstake189168862024-01-02 2:59:11290 days ago1704164351IN
Flashstake: FlashBack Staking
0 ETH0.0009664414.03937791
Unstake188725282023-12-26 21:25:35296 days ago1703625935IN
Flashstake: FlashBack Staking
0 ETH0.0017663821.40870469
Unstake188719352023-12-26 19:25:35296 days ago1703618735IN
Flashstake: FlashBack Staking
0 ETH0.0014779821.47353862
Unstake187792472023-12-13 19:12:23309 days ago1702494743IN
Flashstake: FlashBack Staking
0 ETH0.0050638361.36638049
Unstake187659702023-12-11 22:34:47311 days ago1702334087IN
Flashstake: FlashBack Staking
0 ETH0.0009748345.97430919
Unstake187180062023-12-05 5:17:23318 days ago1701753443IN
Flashstake: FlashBack Staking
0 ETH0.0029904243.44150932
Unstake186557562023-11-26 12:09:35327 days ago1701000575IN
Flashstake: FlashBack Staking
0 ETH0.0019676723.84831352
Unstake186167662023-11-21 1:08:35332 days ago1700528915IN
Flashstake: FlashBack Staking
0 ETH0.004274562.10420756
Unstake186106762023-11-20 4:40:11333 days ago1700455211IN
Flashstake: FlashBack Staking
0 ETH0.0046747467.91928165
Unstake185868332023-11-16 20:27:35336 days ago1700166455IN
Flashstake: FlashBack Staking
0 ETH0.0029307542.58090783
Unstake185868292023-11-16 20:26:47336 days ago1700166407IN
Flashstake: FlashBack Staking
0 ETH0.0026659338.73327588
Unstake185868232023-11-16 20:25:35336 days ago1700166335IN
Flashstake: FlashBack Staking
0 ETH0.0028588941.53679725
Unstake185559202023-11-12 12:46:23341 days ago1699793183IN
Flashstake: FlashBack Staking
0 ETH0.0022447132.60868344
Unstake185558982023-11-12 12:41:59341 days ago1699792919IN
Flashstake: FlashBack Staking
0 ETH0.0026294931.86571176
Unstake185173302023-11-07 3:14:35346 days ago1699326875IN
Flashstake: FlashBack Staking
0 ETH0.0016869524.50615886
Unstake185173272023-11-07 3:13:59346 days ago1699326839IN
Flashstake: FlashBack Staking
0 ETH0.0017557725.50595533
Unstake185173242023-11-07 3:13:23346 days ago1699326803IN
Flashstake: FlashBack Staking
0 ETH0.0017893125.99317768
Unstake185173172023-11-07 3:11:59346 days ago1699326719IN
Flashstake: FlashBack Staking
0 ETH0.0017494325.41377045
Unstake185047562023-11-05 8:55:59348 days ago1699174559IN
Flashstake: FlashBack Staking
0 ETH0.0014514317.5893615
Unstake184839532023-11-02 10:58:11351 days ago1698922691IN
Flashstake: FlashBack Staking
0 ETH0.0016416719.89480671
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Contract Source Code Verified (Exact Match)

Contract Name:
FlashBack

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 800 runs

Other Settings:
default evmVersion
File 1 of 6 : FlashBack.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

contract FlashBack is Ownable {
    using SafeERC20 for IERC20;

    address public immutable stakingTokenAddress;
    address public immutable rewardTokenAddress;
    uint256 public immutable minimumStakeDuration;
    uint256 public immutable maximumStakeDuration;

    uint256 public totalReservedRewards;
    uint256 public totalLockedAmount;
    address public forfeitRewardAddress = 0x8603FfE7B00CCd759f28aBfE448454A24cFba581;

    uint256 public maxAPR = 1;

    struct StakeStruct {
        address stakerAddress;
        uint256 stakedAmount;
        uint256 reservedReward;
        uint256 stakeStartTs;
        uint256 stakeDuration;
        bool active;
    }
    mapping(uint256 => StakeStruct) public stakes;
    uint256 public stakeCount = 0;

    event Staked(uint256 stakeId, uint256 _amount, uint256 _duration);
    event Unstaked(uint256 stakeId, uint256 _reward, uint256 _rewardForfeited);
    event ForfeitRewardAddressChange(address _forfeitRewardAddress);
    event MaxAPRChange(uint256 _newMaxAPR);

    constructor(
        address _stakingTokenAddress,
        address _rewardTokenAddress,
        uint256 _minimumStakeDuration,
        uint256 _maximumStakeDuration
    ) public {
        stakingTokenAddress = _stakingTokenAddress;
        rewardTokenAddress = _rewardTokenAddress;
        minimumStakeDuration = _minimumStakeDuration;
        maximumStakeDuration = _maximumStakeDuration;
    }

    function stake(
        uint256 _amount,
        uint256 _duration,
        uint256 _minimumReward
    ) external returns (uint256) {
        require(msg.sender != 0x5089722613C2cCEe071C39C59e9889641f435F15, "BLACKLISTED ADDRESS");
        require(msg.sender != 0x8603FfE7B00CCd759f28aBfE448454A24cFba581, "BLACKLISTED ADDRESS");

        uint256 reward = calculateReward(_amount, _duration);
        require(reward >= _minimumReward, "MINIMUM REWARD NOT MET");

        // Transfer tokens from user into contract
        IERC20(stakingTokenAddress).safeTransferFrom(msg.sender, address(this), _amount);

        // Reserve the reward amount
        totalReservedRewards = totalReservedRewards + reward;
        totalLockedAmount = totalLockedAmount + _amount;

        // Store stake info
        stakeCount = stakeCount + 1;
        stakes[stakeCount] = StakeStruct(msg.sender, _amount, reward, block.timestamp, _duration, true);

        emit Staked(stakeCount, _amount, _duration);

        return stakeCount;
    }

    function unstake(uint256 _stakeId) external {
        StakeStruct memory p = stakes[_stakeId];

        // Determine if the stake exists
        require(p.active == true, "INVALID STAKE");
        require(p.stakerAddress == msg.sender, "NOT OWNER OF STAKE");
        require(block.timestamp > (p.stakeStartTs + minimumStakeDuration), "DURATION < MINIMUM");

        // Determine whether stake ended or user is unstaking early
        bool unstakedEarly = (p.stakeStartTs + p.stakeDuration) > block.timestamp;

        totalReservedRewards = totalReservedRewards - p.reservedReward;
        totalLockedAmount = totalLockedAmount - p.stakedAmount;

        // Transfer back originally staked tokens and reward (if duration ended)
        if (unstakedEarly) {
            IERC20(stakingTokenAddress).safeTransfer(msg.sender, p.stakedAmount);
            IERC20(rewardTokenAddress).safeTransfer(forfeitRewardAddress, p.reservedReward);

            emit Unstaked(_stakeId, 0, p.reservedReward);
        } else {
            IERC20(stakingTokenAddress).safeTransfer(msg.sender, p.stakedAmount);
            IERC20(rewardTokenAddress).safeTransfer(msg.sender, p.reservedReward);

            emit Unstaked(_stakeId, p.reservedReward, 0);
        }

        delete stakes[_stakeId];
    }

    function calculateReward(uint256 _amount, uint256 _duration) public view returns (uint256) {
        require(_amount > 0, "INSUFFICIENT INPUT");
        require(_duration >= minimumStakeDuration, "DURATION < MINIMUM");
        require(_duration <= maximumStakeDuration, "DURATION > MAXIMUM");

        uint256 reward = ((_duration**2) * (maxAPR * _amount)) / ((10000 * 994519296000000));

        uint256 rewardsAvailable = getAvailableRewards();
        if (reward > rewardsAvailable) {
            reward = rewardsAvailable;
        }
        require(reward > 0, "INSUFFICIENT OUTPUT");

        return reward;
    }

    function setForfeitRewardAddress(address _forfeitRewardAddress) external onlyOwner {
        forfeitRewardAddress = _forfeitRewardAddress;
        emit ForfeitRewardAddressChange(_forfeitRewardAddress);
    }

    function setMaxAPR(uint256 _newMaxAPR) external onlyOwner {
        maxAPR = _newMaxAPR;
        emit MaxAPRChange(_newMaxAPR);
    }

    function getAvailableRewards() public view returns (uint256) {
        // In the event the staking token and reward token are the same
        if (stakingTokenAddress == rewardTokenAddress) {
            return IERC20(stakingTokenAddress).balanceOf(address(this)) - totalReservedRewards - totalLockedAmount;
        } else {
            // In the event they are different
            return IERC20(rewardTokenAddress).balanceOf(address(this)) - totalReservedRewards;
        }
    }
}

File 2 of 6 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/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.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 3 of 6 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

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

File 4 of 6 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 5 of 6 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 6 of 6 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

Settings
{
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_stakingTokenAddress","type":"address"},{"internalType":"address","name":"_rewardTokenAddress","type":"address"},{"internalType":"uint256","name":"_minimumStakeDuration","type":"uint256"},{"internalType":"uint256","name":"_maximumStakeDuration","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_forfeitRewardAddress","type":"address"}],"name":"ForfeitRewardAddressChange","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_newMaxAPR","type":"uint256"}],"name":"MaxAPRChange","type":"event"},{"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":"uint256","name":"stakeId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_duration","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"stakeId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_reward","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_rewardForfeited","type":"uint256"}],"name":"Unstaked","type":"event"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"_duration","type":"uint256"}],"name":"calculateReward","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"forfeitRewardAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAvailableRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxAPR","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maximumStakeDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minimumStakeDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardTokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_forfeitRewardAddress","type":"address"}],"name":"setForfeitRewardAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newMaxAPR","type":"uint256"}],"name":"setMaxAPR","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"_duration","type":"uint256"},{"internalType":"uint256","name":"_minimumReward","type":"uint256"}],"name":"stake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakeCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stakes","outputs":[{"internalType":"address","name":"stakerAddress","type":"address"},{"internalType":"uint256","name":"stakedAmount","type":"uint256"},{"internalType":"uint256","name":"reservedReward","type":"uint256"},{"internalType":"uint256","name":"stakeStartTs","type":"uint256"},{"internalType":"uint256","name":"stakeDuration","type":"uint256"},{"internalType":"bool","name":"active","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stakingTokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalLockedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalReservedRewards","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":[{"internalType":"uint256","name":"_stakeId","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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

000000000000000000000000b1f1f47061a7be15c69f378cb3f69423bd58f2f8000000000000000000000000b1f1f47061a7be15c69f378cb3f69423bd58f2f800000000000000000000000000000000000000000000000000000000000d2f000000000000000000000000000000000000000000000000000000000001e13380

-----Decoded View---------------
Arg [0] : _stakingTokenAddress (address): 0xB1f1F47061A7Be15C69f378CB3f69423bD58F2F8
Arg [1] : _rewardTokenAddress (address): 0xB1f1F47061A7Be15C69f378CB3f69423bD58F2F8
Arg [2] : _minimumStakeDuration (uint256): 864000
Arg [3] : _maximumStakeDuration (uint256): 31536000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000b1f1f47061a7be15c69f378cb3f69423bd58f2f8
Arg [1] : 000000000000000000000000b1f1f47061a7be15c69f378cb3f69423bd58f2f8
Arg [2] : 00000000000000000000000000000000000000000000000000000000000d2f00
Arg [3] : 0000000000000000000000000000000000000000000000000000000001e13380


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OVERVIEW

This contract allows Flash holders to Stake their Flash for a set duration and earn up to 100% additional Flash at the end of their stake.

Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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