Contract 0x904943e97a51A8260fd71187bC9d2c69FeB8547f 1

 

Contract Overview

Balance:
0 Ether

EtherValue:
$0.00

Token:
 
Txn Hash
Method
Block
From
To
Value
0x639fe202719e0578c9d843dccbec932c1944db910c84a7bb6dc3e30fffc108f3Withdraw153109602022-08-09 23:38:061 day 18 hrs ago0x33678e563e130ed39cfd7c122dda3c7c8a3a1465 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00091219 15.‍67027164
0x9f15d8dcce319e9f247f983dfef74d4f6b63ed7dd065449ed614a46c56e24aceWithdraw153046292022-08-08 23:45:082 days 18 hrs ago0x71cff83956e0bd4523827c0a993e1e0a32bfbbce IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00069457 11.‍93188171
0x22889930fab7aeb1d0d84a8fc33aa227fc403e42177c7383bd90e29d10b9e81aWithdraw153043052022-08-08 22:34:462 days 19 hrs ago0x3227a45c17cfb8ead1f4bd60a4f2ba0cabc18cfc IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00056273 16.‍91866182
0x1d85dddc6cb913937962c1e429e4f7e21a5cb8b7095a55b41f9d4978765809c0Withdraw153043052022-08-08 22:34:462 days 19 hrs ago0x3227a45c17cfb8ead1f4bd60a4f2ba0cabc18cfc IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00100702 17.‍2993534
0xb374a08a52ef0d3b3b48af8b0f784044beb4cf9e1ebe4ecf71bbdd22870bc7ceWithdraw152999812022-08-08 6:28:533 days 12 hrs agoENS Name anonmus.eth IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00045678 7.‍84686125
0x077428d7be2a13157734937367fca5477ba4d96184172cb2e11c84b09123ccfeWithdraw152975542022-08-07 21:13:213 days 21 hrs ago0x134e2ca341d0128fdbad3c35a6e2f512ee2cb3f5 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00055024 9.‍45240714
0x460bf4b3dc908caaeff63d642b86fb5b3cb7d55dddf8dec2d3940425578999ffWithdraw152974562022-08-07 20:51:483 days 21 hrs ago0x188211aee5d6222c0447f9529a2690acaeda971f IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00090058 15.‍47079419
0x1f0db69827de6f392bca5e84808fa51077f4c5ac08eca288f259ec4c1ceaf607Withdraw152924442022-08-07 2:14:314 days 16 hrs ago0x9a43289013a3ee8e5417a527f148c14e730df504 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00019133 3.‍28678111
0x50f8d9fd094d2290facf03123ef041a7851939e1a21552c58bca70983222b238Withdraw152912112022-08-06 21:34:544 days 20 hrs ago0xec8576a637b3070e80b5b971a3cd57aeb28f9699 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00066846 11.‍48321965
0xb2c8e21dff3fa0d0ba8c80c06f1db4fa0ccbb135af38cbe8786dee43b5b0df5fWithdraw152864672022-08-06 3:57:435 days 14 hrs ago0xe2a956faf60beeb0e2c6fc40dc9e3b329106308a IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍0003971 11.‍93903871
0xfbe3945fadcdc99ec9e62487dee3ad78335dadec35108a23c43ee50a9930b1cfWithdraw152864672022-08-06 3:57:435 days 14 hrs ago0xe2a956faf60beeb0e2c6fc40dc9e3b329106308a IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00097254 16.‍70698817
0x9ef5c6d287aaf7ee1be535b8933b98d4e95aac4b726971ce1fec1d1f4a28bfd0Withdraw152861282022-08-06 2:39:165 days 15 hrs ago0x812d7a7014c89f1ffc849a62a6d0bf4395901705 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00043926 7.‍54588311
0xdf7504d5b42c8b5d4fecaef2e5e8980ccfb16cfe04e8785f41201a1141b09fc1Withdraw152834132022-08-05 16:30:346 days 2 hrs ago0x1bfc39ceb0b43c0f4441b1c0917b52fbcb65213b IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00172723 29.‍67152143
0xe46c8b2470f36ff08ab4d2c51b6f09f1c9734d73177897b40a76aba7c3d02aafWithdraw152821052022-08-05 11:42:336 days 6 hrs ago0xae7cc34f6aaf56ab8c11b6e39a2360f1dbee50a4 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00125801 16.‍70403864
0xb120464419129f19910a5b471d5c3badf0f7fc14dd5b59d68de8a643b8a1db37Withdraw152795862022-08-05 2:20:216 days 16 hrs ago0x6048fc91583e3373acb88d2196db8aedf9730fe1 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00109631 18.‍82920222
0x12254231b0df1723e03cdee5d01f0f65cf35404fa8fa8bee01e0cac52b2064edWithdraw152767002022-08-04 15:28:087 days 3 hrs ago0xb727e028a7c5364a2e1078f5ecad023c82ccfdc8 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍0007252 21.‍79564516
0x17205059af8f5649ad0fa08a3983153ae4e0b5e845894873bdaa5b16c90d5d41Withdraw152767002022-08-04 15:28:087 days 3 hrs ago0xb727e028a7c5364a2e1078f5ecad023c82ccfdc8 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00054815 16.‍47458811
0x4d8231e5eff7e1da12eb6ed9205fd2ee4e170f0ab461e73ce00ca836eb0ad817Withdraw152767002022-08-04 15:28:087 days 3 hrs ago0xb727e028a7c5364a2e1078f5ecad023c82ccfdc8 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00095921 16.‍47458811
0x9f84d0edab17e8af293b7ab12de37eb7399fcd037c008255b0ca6cf4fe3bb78aWithdraw152726742022-08-04 0:25:167 days 18 hrs ago0x5dc23472e3fe47a7df6f27e8f9d2eaf9a7b13a54 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00045999 7.‍90210959
0x533ca378e1a537dfc56a0b7bbb1ea3e5723a5a0397c0c710dbccf06aeac60738Withdraw152722372022-08-03 22:50:427 days 19 hrs ago0x5c7896d2bc82f329fd81c14f4ecb0365bf40c431 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍0009929 17.‍05663752
0x7885f0e0f348d2061f303d7bdf325c849c9091dfaf8ea6cfd28bc4ffdbf79b12Withdraw152715442022-08-03 20:20:137 days 22 hrs ago0x82c36c13af2061a38163b2d0049e07181dccd927 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00084753 14.‍5594886
0xfcf009805259f88911f36edcd169f94aa4b910e9f9163bd75a464295fb77aae7Withdraw152712172022-08-03 19:08:057 days 23 hrs ago0x2aced456aaa479e400e688bab1f9247d27086903 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍0016457 28.‍27096944
0x149abdd74b0a6680fa6ac8473719770cc482947bff92f0892ba517287d78006bWithdraw152712042022-08-03 19:05:227 days 23 hrs ago0x5168d56e2c233d290e23ce55554a37dda051063d IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00147732 25.‍37835323
0x66d61abfaad67e79e5b0f73bf89b9bc5e899e5688af27bd5478ebab7b6cfa265Withdraw152695072022-08-03 12:37:518 days 5 hrs ago0x1e3403a4d514948051e6e8f62955bd6415345c48 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00052145 8.‍95601645
0xb51f95ff7ce1cea461280a44d107e3aa906231b36295c3843069d57cdf85f32fWithdraw152678912022-08-03 6:30:078 days 12 hrs ago0x2fdb099e91d4f0c83bb01f0472ac63811df08712 IN  0x904943e97a51a8260fd71187bc9d2c69feb8547f0 Ether0.‍00023502 7.‍06856119
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x0F8544887bE3b6DB7535B996C047fC8eec8E49f6

Contract Name:
staking

Compiler Version
v0.8.3+commit.8d00100c

Optimization Enabled:
Yes with 9999 runs

Other Settings:
default evmVersion
File 1 of 7 : staking.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

interface SkyToken {
    function extMint(address _addr, uint256 _amount) external returns (bool);

    function isWhitelistedReceiver(address _addr) external view returns (bool);

    function isWhitelistedMinter(address _addr) external view returns (bool);

    /**
     * @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
    );
}

contract staking is Ownable, ERC20 {
    using SafeMath for uint256;

    uint256 public currentRound = 0;

    uint24 public WEEK = 604800;
    uint256 public readyAt = 0;
    uint256 public deployTime = block.timestamp ; 

    address public token_addr;
    SkyToken token_contract = SkyToken(token_addr);

    uint256 public am1 = 250e3 * 1e18 ; 
    uint256 public am2 = 500e3 * 1e18 ; 
    uint256 public am3 = 750e3 * 1e18 ;
    uint256 public am4 = 1e6 * 1e18 ; 

    mapping(uint256 => uint256) public roundPricePerShare;
    mapping(address => uint256) public roundDeposited;
    uint256 public ppsMultiplier = 1e18;

    event Deposit(address indexed addr, uint256 assetAmount);
    event Withdraw(
        address indexed addr,
        uint256 shareAmount,
        uint256 assetAmount
    );
    event Roll(uint256 newRound, uint256 newPPS);

    constructor() ERC20("Staked SkyToken", "sSKY") {
        roundPricePerShare[currentRound] = 1 * ppsMultiplier ; 
    }

    /**
     * @notice Set Skycoin token contract address
     * @param addr Address of Skycoin token contract
     */
    function set_token_address(address addr) external onlyOwner {
        token_addr = addr;
        token_contract = SkyToken(addr);
    }

    /**
     * @notice Deposits the `asset` into the contract and mint vault shares.
     * @param amount is the amount of `asset` to deposit
     */
    function deposit(uint256 amount) external {
        token_contract.transferFrom(msg.sender, address(this), amount);
        _deposit(amount);

        roundDeposited[msg.sender] = currentRound;

        emit Deposit(msg.sender, amount);
    }

    /**
     * @notice Mints the vault shares to the msg.sender
     * @param amount is the amount of `asset` deposited
     */
    function _deposit(uint256 amount) private {
        uint256 totalWithDepositedAmount = totalBalance();

        // amount needs to be subtracted from totalBalance because it has already been
        // added to it from either IWETH.deposit and IERC20.safeTransferFrom
        uint256 total = totalWithDepositedAmount.sub(amount);

        uint256 shareSupply = totalSupply();

        // Following the pool share calculation from Alpha Homora:
        // solhint-disable-next-line
        // https://github.com/AlphaFinanceLab/alphahomora/blob/340653c8ac1e9b4f23d5b81e61307bf7d02a26e8/contracts/5/Bank.sol#L104
        uint256 share = shareSupply == 0
            ? amount
            : amount.mul(shareSupply).div(total);

        _mint(msg.sender, share);
    }

    /**
     * @notice Withdraws WETH from vault using vault shares
     * @param shares is the number of vault shares to be burned
     */
    function withdraw(uint256 shares) public {
        uint256 withdrawAmount = getWithdrawAmount(shares, msg.sender);

        _burn(msg.sender, shares);

        token_contract.transfer(msg.sender, withdrawAmount);

        emit Withdraw(msg.sender, shares, withdrawAmount);
    }

    /**
     * @dev Get withdraw amount of shares value
     * @param shares How many shares will be exchanged
     */
    function getWithdrawAmount(uint256 shares, address _addr)
        public
        view
        returns (uint256 amount)
    {
        uint256 PPS;

        //check if last user: cannot use shares, could be partial withdraw
        uint256 userShareBalance = balanceOf(_addr);

        if (userShareBalance == totalSupply()) {
            //last user
            PPS = getPricePerShare(currentRound);
        } else {
            PPS = getPricePerShare(currentRound.sub(1));
        }

        amount = (shares.mul(PPS)).div(ppsMultiplier);
    }

    /**
     * @dev Get round in which user started staking latest staking round
     */
    function getUserStartRound(address _addr)
        public
        view
        returns (uint256 startRound)
    {
        startRound = roundDeposited[_addr];
    }

    /**
     * @dev Get mint amount for roll()
     * @param timestamp current timestamp     
     */
    function getMintAmount(uint timestamp) public view returns (uint256 amount) {
        if (timestamp < deployTime + 31557600) {
            amount = am1 ; 
        } else {
            if (timestamp < deployTime + 63115200) {
                amount = am2 ; 
            } else {
                if (timestamp < deployTime + 94672800) {
                    amount = am3 ; 
                } else {
                    amount = am4 ; 
                   }
                }
            }
        }

    /**
     * @dev Change mint amounts for year 1, 2, 3 and >= 4
     * @param _am1 Amount to mint per week in year 1
     * @param _am2 Amount to mint per week in year 2
     * @param _am3 Amount to mint per week in year 3
     * @param _am4 Amount to mint per week in year 4
     */
    function changeMintAmounts(uint _am1, uint _am2, uint _am3, uint _am4) external onlyOwner {
        am1 = _am1 ; 
        am2 = _am2 ; 
        am3 = _am3 ; 
        am4 = _am4 ; 
    }

    /*
     * @notice Rolls the vault's funds into a new short position.
     */
    function roll() external onlyOwner {
        require(block.timestamp >= readyAt, "not ready to roll yet");
        
        uint mintAmount = getMintAmount(block.timestamp)/52 ; 
        token_contract.extMint(address(this), mintAmount);

        readyAt = block.timestamp.add(WEEK);
        currentRound = currentRound.add(1);

        roundPricePerShare[currentRound] = getPricePerShare(currentRound);

        emit Roll(currentRound, roundPricePerShare[currentRound]);
    }

    /**
     * @dev Get pricePerShare of a certain round (multiplied with ppsMultiplier!)
     * @param round Round to get the pricePerShare
     */
    function getPricePerShare(uint256 round) public view returns (uint256 pps) {
        if (round == currentRound) {
            uint256 _assetBalance = assetBalance();
            uint256 _shareSupply = totalSupply();

            if (_shareSupply == 0) {
                pps = 1;
            } else {
                pps = (_assetBalance.mul(ppsMultiplier)).div(_shareSupply);
            }
        } else {
            pps = roundPricePerShare[round];
        }
    }

    /**
     * @dev Get user asset balance using user share balance
     * @param _addr Address to get the user asset balance from
     */
    function getUserAssetBalance(address _addr)
        external
        view
        returns (uint256 balance)
    {
        uint256 userShareBalance = balanceOf(_addr);
        balance = getWithdrawAmount(userShareBalance, _addr);
    }

    /**
     * @notice Returns the vault's total balance, including the amounts locked into a short position
     * @return total balance of the vault, including the amounts locked in third party protocols
     */
    function totalBalance() public view returns (uint256) {
        return token_contract.balanceOf(address(this));
    }

    /**
     * @notice Returns the asset balance on the vault. This balance is freely withdrawable by users.
     */
    function assetBalance() public view returns (uint256) {
        return token_contract.balanceOf(address(this));
    }
}

File 2 of 7 : 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 7 : SafeMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
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) {
        unchecked {
            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) {
        unchecked {
            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) {
        unchecked {
            // 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) {
        unchecked {
            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) {
        unchecked {
            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) {
        return a + b;
    }

    /**
     * @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 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) {
        return a * b;
    }

    /**
     * @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.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        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) {
        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) {
        unchecked {
            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.
     *
     * 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) {
        unchecked {
            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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

File 4 of 7 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

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

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

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

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

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        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] + 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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(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:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

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

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

    /**
     * @dev 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 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 Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 5 of 7 : 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 7 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^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 7 of 7 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 9999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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nalType":"address","name":"_addr","type":"address"}],"name":"getUserStartRound","outputs":[{"internalType":"uint256","name":"startRound","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"address","name":"_addr","type":"address"}],"name":"getWithdrawAmount","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ppsMultiplier","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"readyAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"roll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"roundDeposited","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"roundPricePerShare","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"set_token_address","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token_addr","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"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"},{"inputs":[{"internalType":"uint256","name":"shares","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.