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Contract Source Code (Solidity)

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Outline

•    - function _msgSender()
•    - function _msgData()
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(
•  contract Redeemer is Ownable *
•    - function add(uint x, uint y)
•    - function mul(uint x, uint y)
•    - function wmul(uint x, uint y)
•    - function redeem()
•    - function withdraw()

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/**
 *Submitted for verification at Etherscan.io on 2021-12-17
*/

// Verified using https://dapp.tools

// hevm: flattened sources of src/Redeemer.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

////// lib/openzeppelin-contracts/contracts/utils/Context.sol
// OpenZeppelin Contracts v4.3.2 (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;
    }
}

////// lib/openzeppelin-contracts/contracts/access/Ownable.sol
// OpenZeppelin Contracts v4.3.2 (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);
    }
}

////// lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol
// OpenZeppelin Contracts v4.3.2 (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);
}

////// src/Redeemer.sol
/* pragma solidity ^0.8.0; */

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

/**
 * @dev A Redeemer contract
 */
contract Redeemer is Ownable {
    IERC20 immutable public grid;
    IERC20 immutable public phon;
    uint256 immutable public deadline;
    uint256 constant internal MULTIPLIER = 155e18; // Phonon tokens per Grid

    uint256 constant internal WAD = 10 ** 18;

    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, "ds-math-add-overflow");
    }

     function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
    }

    //rounds to zero if x*y < WAD / 2
    function wmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }

    /**
     * @dev Constructor
     * @param _grid Old GRID token to be locked up
     * @param _phon New PHONON token to be distributed
     * @param _deadline When contract owner can withdraw PHONON tokens
     */
    constructor(IERC20 _grid, IERC20 _phon, uint256 _deadline) {
        grid = _grid;
        phon = _phon;
        deadline = _deadline;
    }

    function redeem() external {
        uint256 amount = grid.balanceOf(msg.sender);
        require(grid.transferFrom(msg.sender, address(this), amount), "Redeemer: could not transfer GRID.");
        require(phon.transfer(msg.sender, wmul(amount * 10 ** 6, MULTIPLIER) ), "Redeemer: could not transfer PHONON.");
    }

    /**
     * @notice Withdraws PHONON tokens from the contract.
     */
    function withdraw() external onlyOwner {
        require(
            block.timestamp >= deadline,
            "Redeemer: Can't withdraw"
        );
        require(phon.transfer(owner(), phon.balanceOf(address(this))), "Redeemer: withdraw failed");
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000012b19d3e2ccc14da04fae33e63652ce469b3f2fd000000000000000000000000758b4684be769e92eefea93f60dda0181ea303ec00000000000000000000000000000000000000000000000000000000639d48b8

-----Decoded View---------------
Arg [0] : _grid (address): 0x12B19D3e2ccc14Da04FAe33e63652ce469b3F2FD
Arg [1] : _phon (address): 0x758B4684BE769E92eeFeA93f60DDA0181eA303Ec
Arg [2] : _deadline (uint256): 1671252152

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000012b19d3e2ccc14da04fae33e63652ce469b3f2fd
Arg [1] : 000000000000000000000000758b4684be769e92eefea93f60dda0181ea303ec
Arg [2] : 00000000000000000000000000000000000000000000000000000000639d48b8