Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
}

// SPDX-License-Identifier: MIT
// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8.20;

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

interface IERC20Burnable is IERC20 {
    function burn(uint256 amount) external;
}

contract ECOLock {
    /// @notice ECO token
    IERC20Burnable public ecoToken;

    /// @notice Emitted when ECO is claimed 
    event EcoClaimed(address account, uint totalAmount);

    /// @notice Emitted when ECO is burned
    event EcoBurned(uint256 amount);

    // @notice ECO list of every account
    mapping (address => uint256) public ecolist;

    // @notice contract admin
    address public owner;

    constructor(address _ecoToken) public {
        owner = msg.sender;
        ecoToken = IERC20Burnable(_ecoToken);
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "Only owner can call this function.");
        _;
    }

    function setEcoAmountAdd(address[] memory _to, uint256[] memory _amount) onlyOwner public returns (bool) {
        require(_to.length == _amount.length, "The length of the two arrays must be the same");
        for (uint256 i = 0; i < _to.length; i++) {
            ecolist[_to[i]] += _amount[i];
        }
        return true;
    }

    function setEcoAmountSub(address[] memory _to, uint256[] memory _amount) onlyOwner public returns (bool) {
        require(_to.length == _amount.length, "The length of the two arrays must be the same");
        for (uint256 i = 0; i < _to.length; i++) {
            ecolist[_to[i]] -= _amount[i];
        }
        return true;
    }

    function ecoClaim() public returns (bool) {
        require(ecolist[msg.sender] > 0, "No locked ECO.");
        uint256 totalAmount = ecolist[msg.sender];
        ecolist[msg.sender] = 0;

        ecoToken.transfer(msg.sender, totalAmount);

        emit EcoClaimed(msg.sender, totalAmount);
        return true;
    }

    function burnEco(uint256 amount) external onlyOwner {
        require(amount > 0, "Amount must be greater than zero");
        ecoToken.burn(amount);
        emit EcoBurned(amount);
    }

    function transferOwnership(address newOwner) onlyOwner public {
        require(newOwner != address(0), "New owner is the zero address");
        owner = newOwner;
    }
}