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Outline

• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address to, uint256 ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(
•  contract aCNVRedemption *
•    - function redeem(address to)

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/**
 *Submitted for verification at Etherscan.io on 2022-04-01
*/

// SPDX-License-Identifier: WTFPL
pragma solidity >=0.8.0;


/**
     ██████╗ ██████╗ ███╗   ██╗ ██████╗ █████╗ ██╗   ██╗██████╗
    ██╔════╝██╔═══██╗████╗  ██║██╔════╝██╔══██╗██║   ██║╚════██╗
    ██║     ██║   ██║██╔██╗ ██║██║     ███████║██║   ██║ █████╔╝
    ██║     ██║   ██║██║╚██╗██║██║     ██╔══██║╚██╗ ██╔╝ ╚═══██╗
    ╚██████╗╚██████╔╝██║ ╚████║╚██████╗██║  ██║ ╚████╔╝ ██████╔╝
     ╚═════╝ ╚═════╝ ╚═╝  ╚═══╝ ╚═════╝╚═╝  ╚═╝  ╚═══╝  ╚═════╝
    Concave
*/

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)



/**
 * @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 `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);

    /**
     * @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 aCNVRedemption {

    event Redemption(address indexed redeemer, uint256 output);

    /* -------------------------------------------------------------------------- */
    /*                                   STORAGE                                  */
    /* -------------------------------------------------------------------------- */

    IERC20 public constant CNV = IERC20(0x000000007a58f5f58E697e51Ab0357BC9e260A04);

    IERC20 public constant aCNV = IERC20(0x6Ff0106D34FEEe8A8aCF2e7b9168480f86B82E2f);

    mapping(address => bool) hasRedeemed;

    /* -------------------------------------------------------------------------- */
    /*                                REDEEM LOGIC                                */
    /* -------------------------------------------------------------------------- */

    // @notice This contract is minted aCNV's totalSupply at CNV launch,
    // redemption rate is 1:1
    function redeem(address to) external returns (uint256 output) {

        require(hasRedeemed[msg.sender] == false, "!ALREADY_REDEEMED");

        output = aCNV.balanceOf(msg.sender);

        hasRedeemed[msg.sender] = true;

        CNV.transfer(to, output);

        emit Redemption(msg.sender, output);
    }
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"redeemer","type":"address"},{"indexed":false,"internalType":"uint256","name":"output","type":"uint256"}],"name":"Redemption","type":"event"},{"inputs":[],"name":"CNV","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"aCNV","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"redeem","outputs":[{"internalType":"uint256","name":"output","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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ipfs://8de303bf1169fce7abd9842a96174a68cc9945b30d1be1eadd306e472eb66cb8