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• library BoringMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function mul(uint256 a, uint256 b)
•    - function to128(uint256 a)
•    - function to64(uint256 a)
•    - function to32(uint256 a)
• library BoringMath128
•    - function add(uint128 a, uint128 b)
•    - function sub(uint128 a, uint128 b)
• library BoringMath64
•    - function add(uint64 a, uint64 b)
•    - function sub(uint64 a, uint64 b)
• library BoringMath32
•    - function add(uint32 a, uint32 b)
•    - function sub(uint32 a, uint32 b)
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function permit(
• library BoringERC20
•    - function returnDataToString(bytes mem ...
•    - function safeSymbol(IERC20 token)
•    - function safeName(IERC20 token)
•    - function safeDecimals(IERC20 token)
•    - function safeTransfer(
•    - function safeTransferFrom(
•  contract Domain
•    - function _calculateDomainSeparator(ui ...
•    - function _domainSeparator()
•    - function _getDigest(bytes32 dataHash)
•  contract nICE is IERC20, Domain *
•    - function balanceOf(address user)
•    - function _transfer(
•    - function _useAllowance(address from, ...
•    - function transfer(address to, uint256 ...
•    - function transferFrom(
•    - function approve(address spender, uin ...
•    - function DOMAIN_SEPARATOR()
•    - function permit(
•    - function mint(uint256 amount)
•    - function _burn(
•    - function burn(address to, uint256 sha ...
•    - function burnFrom(

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/**
 *Submitted for verification at Etherscan.io on 2021-07-09
*/

// SPDX-License-Identifier: MIXED

// File @boringcrypto/boring-solidity/contracts/libraries/[email protected]
// License-Identifier: MIT
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

/// @notice A library for performing overflow-/underflow-safe math,
/// updated with awesomeness from of DappHub (https://github.com/dapphub/ds-math).
library BoringMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        require(b == 0 || (c = a * b) / b == a, "BoringMath: Mul Overflow");
    }

    function to128(uint256 a) internal pure returns (uint128 c) {
        require(a <= uint128(-1), "BoringMath: uint128 Overflow");
        c = uint128(a);
    }

    function to64(uint256 a) internal pure returns (uint64 c) {
        require(a <= uint64(-1), "BoringMath: uint64 Overflow");
        c = uint64(a);
    }

    function to32(uint256 a) internal pure returns (uint32 c) {
        require(a <= uint32(-1), "BoringMath: uint32 Overflow");
        c = uint32(a);
    }
}

/// @notice A library for performing overflow-/underflow-safe addition and subtraction on uint128.
library BoringMath128 {
    function add(uint128 a, uint128 b) internal pure returns (uint128 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint128 a, uint128 b) internal pure returns (uint128 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }
}

/// @notice A library for performing overflow-/underflow-safe addition and subtraction on uint64.
library BoringMath64 {
    function add(uint64 a, uint64 b) internal pure returns (uint64 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint64 a, uint64 b) internal pure returns (uint64 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }
}

/// @notice A library for performing overflow-/underflow-safe addition and subtraction on uint32.
library BoringMath32 {
    function add(uint32 a, uint32 b) internal pure returns (uint32 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint32 a, uint32 b) internal pure returns (uint32 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }
}

// File @boringcrypto/boring-solidity/contracts/interfaces/[email protected]
// License-Identifier: MIT

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /// @notice EIP 2612
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

// File @boringcrypto/boring-solidity/contracts/libraries/[email protected]
// License-Identifier: MIT

// solhint-disable avoid-low-level-calls

library BoringERC20 {
    bytes4 private constant SIG_SYMBOL = 0x95d89b41; // symbol()
    bytes4 private constant SIG_NAME = 0x06fdde03; // name()
    bytes4 private constant SIG_DECIMALS = 0x313ce567; // decimals()
    bytes4 private constant SIG_TRANSFER = 0xa9059cbb; // transfer(address,uint256)
    bytes4 private constant SIG_TRANSFER_FROM = 0x23b872dd; // transferFrom(address,address,uint256)

    function returnDataToString(bytes memory data) internal pure returns (string memory) {
        if (data.length >= 64) {
            return abi.decode(data, (string));
        } else if (data.length == 32) {
            uint8 i = 0;
            while(i < 32 && data[i] != 0) {
                i++;
            }
            bytes memory bytesArray = new bytes(i);
            for (i = 0; i < 32 && data[i] != 0; i++) {
                bytesArray[i] = data[i];
            }
            return string(bytesArray);
        } else {
            return "???";
        }
    }

    /// @notice Provides a safe ERC20.symbol version which returns '???' as fallback string.
    /// @param token The address of the ERC-20 token contract.
    /// @return (string) Token symbol.
    function safeSymbol(IERC20 token) internal view returns (string memory) {
        (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(SIG_SYMBOL));
        return success ? returnDataToString(data) : "???";
    }

    /// @notice Provides a safe ERC20.name version which returns '???' as fallback string.
    /// @param token The address of the ERC-20 token contract.
    /// @return (string) Token name.
    function safeName(IERC20 token) internal view returns (string memory) {
        (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(SIG_NAME));
        return success ? returnDataToString(data) : "???";
    }

    /// @notice Provides a safe ERC20.decimals version which returns '18' as fallback value.
    /// @param token The address of the ERC-20 token contract.
    /// @return (uint8) Token decimals.
    function safeDecimals(IERC20 token) internal view returns (uint8) {
        (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(SIG_DECIMALS));
        return success && data.length == 32 ? abi.decode(data, (uint8)) : 18;
    }

    /// @notice Provides a safe ERC20.transfer version for different ERC-20 implementations.
    /// Reverts on a failed transfer.
    /// @param token The address of the ERC-20 token.
    /// @param to Transfer tokens to.
    /// @param amount The token amount.
    function safeTransfer(
        IERC20 token,
        address to,
        uint256 amount
    ) internal {
        (bool success, bytes memory data) = address(token).call(abi.encodeWithSelector(SIG_TRANSFER, to, amount));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "BoringERC20: Transfer failed");
    }

    /// @notice Provides a safe ERC20.transferFrom version for different ERC-20 implementations.
    /// Reverts on a failed transfer.
    /// @param token The address of the ERC-20 token.
    /// @param from Transfer tokens from.
    /// @param to Transfer tokens to.
    /// @param amount The token amount.
    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        (bool success, bytes memory data) = address(token).call(abi.encodeWithSelector(SIG_TRANSFER_FROM, from, to, amount));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "BoringERC20: TransferFrom failed");
    }
}

// File @boringcrypto/boring-solidity/contracts/[email protected]
// License-Identifier: MIT
// Based on code and smartness by Ross Campbell and Keno
// Uses immutable to store the domain separator to reduce gas usage
// If the chain id changes due to a fork, the forked chain will calculate on the fly.

// solhint-disable no-inline-assembly

contract Domain {
    bytes32 private constant DOMAIN_SEPARATOR_SIGNATURE_HASH = keccak256("EIP712Domain(uint256 chainId,address verifyingContract)");
    // See https://eips.ethereum.org/EIPS/eip-191
    string private constant EIP191_PREFIX_FOR_EIP712_STRUCTURED_DATA = "\x19\x01";

    // solhint-disable var-name-mixedcase
    bytes32 private immutable _DOMAIN_SEPARATOR;
    uint256 private immutable DOMAIN_SEPARATOR_CHAIN_ID;    

    /// @dev Calculate the DOMAIN_SEPARATOR
    function _calculateDomainSeparator(uint256 chainId) private view returns (bytes32) {
        return keccak256(
            abi.encode(
                DOMAIN_SEPARATOR_SIGNATURE_HASH,
                chainId,
                address(this)
            )
        );
    }

    constructor() public {
        uint256 chainId; assembly {chainId := chainid()}
        _DOMAIN_SEPARATOR = _calculateDomainSeparator(DOMAIN_SEPARATOR_CHAIN_ID = chainId);
    }

    /// @dev Return the DOMAIN_SEPARATOR
    // It's named internal to allow making it public from the contract that uses it by creating a simple view function
    // with the desired public name, such as DOMAIN_SEPARATOR or domainSeparator.
    // solhint-disable-next-line func-name-mixedcase
    function _domainSeparator() internal view returns (bytes32) {
        uint256 chainId; assembly {chainId := chainid()}
        return chainId == DOMAIN_SEPARATOR_CHAIN_ID ? _DOMAIN_SEPARATOR : _calculateDomainSeparator(chainId);
    }

    function _getDigest(bytes32 dataHash) internal view returns (bytes32 digest) {
        digest =
            keccak256(
                abi.encodePacked(
                    EIP191_PREFIX_FOR_EIP712_STRUCTURED_DATA,
                    _domainSeparator(),
                    dataHash
                )
            );
    }
}

// File contracts/nICE.sol
//License-Identifier: MIT

// Staking in sSpell inspired by Chef Nomi's SushiBar - MIT license (originally WTFPL)
// modified by BoringCrypto for DictatorDAO

contract nICE is IERC20, Domain {
    using BoringMath for uint256;
    using BoringMath128 for uint128;
    using BoringERC20 for IERC20;

    string public constant symbol = "nICE";
    string public constant name = "Staked Ice Tokens";
    uint8 public constant decimals = 18;
    uint256 public override totalSupply;
    uint256 private constant LOCK_TIME = 24 hours;

    IERC20 public immutable token;

    constructor(IERC20 _token) public {
        token = _token;
    }

    struct User {
        uint128 balance;
        uint128 lockedUntil;
    }

    /// @notice owner > balance mapping.
    mapping(address => User) public users;
    /// @notice owner > spender > allowance mapping.
    mapping(address => mapping(address => uint256)) public override allowance;
    /// @notice owner > nonce mapping. Used in `permit`.
    mapping(address => uint256) public nonces;

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    function balanceOf(address user) public view override returns (uint256 balance) {
        return users[user].balance;
    }

    function _transfer(
        address from,
        address to,
        uint256 shares
    ) internal {
        User memory fromUser = users[from];
        require(block.timestamp >= fromUser.lockedUntil, "Locked");
        if (shares != 0) {
            require(fromUser.balance >= shares, "Low balance");
            if (from != to) {
                require(to != address(0), "Zero address"); // Moved down so other failed calls safe some gas
                User memory toUser = users[to];
                users[from].balance = fromUser.balance - shares.to128(); // Underflow is checked
                users[to].balance = toUser.balance + shares.to128(); // Can't overflow because totalSupply would be greater than 2^128-1;
            }
        }
        emit Transfer(from, to, shares);
    }

    function _useAllowance(address from, uint256 shares) internal {
        if (msg.sender == from) {
            return;
        }
        uint256 spenderAllowance = allowance[from][msg.sender];
        // If allowance is infinite, don't decrease it to save on gas (breaks with EIP-20).
        if (spenderAllowance != type(uint256).max) {
            require(spenderAllowance >= shares, "Low allowance");
            allowance[from][msg.sender] = spenderAllowance - shares; // Underflow is checked
        }
    }

    /// @notice Transfers `shares` tokens from `msg.sender` to `to`.
    /// @param to The address to move the tokens.
    /// @param shares of the tokens to move.
    /// @return (bool) Returns True if succeeded.
    function transfer(address to, uint256 shares) public returns (bool) {
        _transfer(msg.sender, to, shares);
        return true;
    }

    /// @notice Transfers `shares` tokens from `from` to `to`. Caller needs approval for `from`.
    /// @param from Address to draw tokens from.
    /// @param to The address to move the tokens.
    /// @param shares The token shares to move.
    /// @return (bool) Returns True if succeeded.
    function transferFrom(
        address from,
        address to,
        uint256 shares
    ) public returns (bool) {
        _useAllowance(from, shares);
        _transfer(from, to, shares);
        return true;
    }

    /// @notice Approves `amount` from sender to be spend by `spender`.
    /// @param spender Address of the party that can draw from msg.sender's account.
    /// @param amount The maximum collective amount that `spender` can draw.
    /// @return (bool) Returns True if approved.
    function approve(address spender, uint256 amount) public override returns (bool) {
        allowance[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32) {
        return _domainSeparator();
    }

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 private constant PERMIT_SIGNATURE_HASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    /// @notice Approves `value` from `owner_` to be spend by `spender`.
    /// @param owner_ Address of the owner.
    /// @param spender The address of the spender that gets approved to draw from `owner_`.
    /// @param value The maximum collective amount that `spender` can draw.
    /// @param deadline This permit must be redeemed before this deadline (UTC timestamp in seconds).
    function permit(
        address owner_,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(owner_ != address(0), "Zero owner");
        require(block.timestamp < deadline, "Expired");
        require(
            ecrecover(_getDigest(keccak256(abi.encode(PERMIT_SIGNATURE_HASH, owner_, spender, value, nonces[owner_]++, deadline))), v, r, s) ==
                owner_,
            "Invalid Sig"
        );
        allowance[owner_][spender] = value;
        emit Approval(owner_, spender, value);
    }

    /// math is ok, because amount, totalSupply and shares is always 0 <= amount <= 69.000.000 * 10^18
    /// theoretically you can grow the amount/share ratio, but it's not practical and useless
    function mint(uint256 amount) public returns (bool) {
        require(msg.sender != address(0), "Zero address");
        User memory user = users[msg.sender];

        uint256 totalTokens = token.balanceOf(address(this));
        uint256 shares = totalSupply == 0 ? amount : (amount * totalSupply) / totalTokens;
        user.balance += shares.to128();
        user.lockedUntil = (block.timestamp + LOCK_TIME).to128();
        users[msg.sender] = user;
        totalSupply += shares;

        token.safeTransferFrom(msg.sender, address(this), amount);

        emit Transfer(address(0), msg.sender, shares);
        return true;
    }

    function _burn(
        address from,
        address to,
        uint256 shares
    ) internal {
        require(to != address(0), "Zero address");
        User memory user = users[from];
        require(block.timestamp >= user.lockedUntil, "Locked");
        uint256 amount = (shares * token.balanceOf(address(this))) / totalSupply;
        users[from].balance = user.balance.sub(shares.to128()); // Must check underflow
        totalSupply -= shares;

        token.safeTransfer(to, amount);

        emit Transfer(from, address(0), shares);
    }

    function burn(address to, uint256 shares) public returns (bool) {
        _burn(msg.sender, to, shares);
        return true;
    }

    function burnFrom(
        address from,
        address to,
        uint256 shares
    ) public returns (bool) {
        _useAllowance(from, shares);
        _burn(from, to, shares);
        return true;
    }
}

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000000000000000000000000f16e81dce15b08f326220742020379b855b87df9

-----Decoded View---------------
Arg [0] : _token (address): 0xf16e81dce15B08F326220742020379B855B87DF9

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000f16e81dce15b08f326220742020379b855b87df9

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