Contract

Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

// SPDX-License-Identifier: UNLICENSED
pragma solidity =0.6.11;

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

contract MerkleDistributor is Ownable {
    uint256 public immutable CLAIM_END_TIMESTAMP;
    
    address public immutable token;
    bytes32 public immutable merkleRoot;

    // This is a packed array of booleans.
    mapping(uint256 => uint256) private claimedBitMap;

    // This event is triggered whenever a call to #claim succeeds.
    event Claimed(uint256 index, address account, uint256 amount);

    constructor(address token_, bytes32 merkleRoot_) public {
        token = token_;
        merkleRoot = merkleRoot_;

        CLAIM_END_TIMESTAMP = block.timestamp + 26 weeks;
    }

    function isClaimed(uint256 index) public view returns (bool) {
        uint256 claimedWordIndex = index / 256;
        uint256 claimedBitIndex = index % 256;
        uint256 claimedWord = claimedBitMap[claimedWordIndex];
        uint256 mask = (1 << claimedBitIndex);
        return claimedWord & mask == mask;
    }

    function _setClaimed(uint256 index) private {
        uint256 claimedWordIndex = index / 256;
        uint256 claimedBitIndex = index % 256;
        claimedBitMap[claimedWordIndex] = claimedBitMap[claimedWordIndex] | (1 << claimedBitIndex);
    }

    function claim(uint256 index, address account, uint256 amount, bytes32[] calldata merkleProof) external {
        require(!isClaimed(index), 'MerkleDistributor: Drop already claimed.');

        // Verify the merkle proof.
        bytes32 node = keccak256(abi.encodePacked(index, account, amount));
        require(MerkleProof.verify(merkleProof, merkleRoot, node), 'MerkleDistributor: Invalid proof.');

        // Mark it claimed and send the token.
        _setClaimed(index);
        require(IERC20(token).transfer(account, amount), 'MerkleDistributor: Transfer failed.');

        emit Claimed(index, account, amount);
    }

    function withdraw() external onlyOwner {
        require(block.timestamp >= CLAIM_END_TIMESTAMP);
        IERC20(token).transfer(msg.sender, IERC20(token).balanceOf(address(this)));
    } 
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev These functions deal with verification of Merkle trees (hash trees),
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        bytes32 computedHash = leaf;

        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return computedHash == root;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/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.
 */
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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"token_","type":"address"},{"internalType":"bytes32","name":"merkleRoot_","type":"bytes32"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"index","type":"uint256"},{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Claimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"CLAIM_END_TIMESTAMP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes32[]","name":"merkleProof","type":"bytes32[]"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"isClaimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"merkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

0000000000000000000000007f0693074f8064cfbcf9fa6e5a3fa0e4f58ccccf60adcb92999bbf31622580a00b1d793b8c91a7f359a00e6c3c7d1720135d09ed

-----Decoded View---------------
Arg [0] : token_ (address): 0x7F0693074F8064cFbCf9fA6E5A3Fa0e4F58CcCCF
Arg [1] : merkleRoot_ (bytes32): 0x60adcb92999bbf31622580a00b1d793b8c91a7f359a00e6c3c7d1720135d09ed

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000007f0693074f8064cfbcf9fa6e5a3fa0e4f58ccccf
Arg [1] : 60adcb92999bbf31622580a00b1d793b8c91a7f359a00e6c3c7d1720135d09ed