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Contract Source Code Verified (Exact Match)

Contract Name:
MerkleClaimERC20

Compiler Version
v0.8.13+commit.abaa5c0e

Optimization Enabled:
Yes with 1 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at Etherscan.io on 2022-04-11
*/

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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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);
    }
}

// File: @openzeppelin/contracts/utils/cryptography/MerkleProof.sol


// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
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) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        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 = _efficientHash(computedHash, proofElement);
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = _efficientHash(proofElement, computedHash);
            }
        }
        return computedHash;
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.5.0) (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 `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);
}

// File: contracts/Claim.sol


pragma solidity >=0.8.0;

/// ============ Imports ============




/// @title MerkleClaimERC20
/// @notice ERC20 claimable by members of a merkle tree
/// @author Anish Agnihotri <contact@anishagnihotri.com>
/// @dev Solmate ERC20 includes unused _burn logic that can be removed to optimize deployment cost
contract MerkleClaimERC20 is Ownable {

  /// ============ Immutable storage ============

  /// @notice ERC20-claimee inclusion root
  bytes32 public immutable merkleRoot;
  address public immutable token;

  /// ============ Mutable storage ============

  /// @notice Mapping of addresses who have claimed tokens
  mapping(address => bool) public hasClaimed;

  /// ============ Errors ============

  /// @notice Thrown if address has already claimed
  error AlreadyClaimed();
  /// @notice Thrown if address/amount are not part of Merkle tree
  error NotInMerkle();

  /// ============ Constructor ============

  /// @notice Creates a new MerkleClaimERC20 contract
  /// @param _merkleRoot of claimees
  constructor(
    bytes32 _merkleRoot
  ) {
    merkleRoot = _merkleRoot; // Update root
    token = 0xa23C1194d421F252b4e6D5edcc3205F7650a4eBE;
  }

  /// ============ Events ============

  /// @notice Emitted after a successful token claim
  /// @param to recipient of claim
  /// @param amount of tokens claimed
  event Claim(address indexed to, uint256 amount);

  /// ============ Functions ============

  /// @notice Allows claiming tokens if address is part of merkle tree
  /// @param to address of claimee
  /// @param amount of tokens owed to claimee
  /// @param proof merkle proof to prove address and amount are in tree
  function claim(address to, uint256 amount, bytes32[] calldata proof) external {
    // Throw if address has already claimed tokens
    if (hasClaimed[to]) revert AlreadyClaimed();

    // Verify merkle proof, or revert if not in tree
    bytes32 leaf = keccak256(abi.encodePacked(to, amount));
    bool isValidLeaf = MerkleProof.verify(proof, merkleRoot, leaf);
    if (!isValidLeaf) revert NotInMerkle();

    // Set address to claimed
    hasClaimed[to] = true;

    // Mint tokens to address
    require(IERC20(token).transfer(to, amount), "MerkleDistributor: Transfer failed.");

    // Emit claim event
    emit Claim(to, amount);
  }

  function removeStuckToken(address _token, uint256 _amount) external onlyOwner {
    require(_amount > 0 && IERC20(_token).balanceOf(address(this)) >= _amount,"Error");
    require(IERC20(_token).transfer(msg.sender, _amount));
  }
}

Contract Security Audit

Contract ABI

API
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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

4368ac6506a785e966e00cabb073ee904a4005c9b36ff555494fd6ef935a5b1a

-----Decoded View---------------
Arg [0] : _merkleRoot (bytes32): 0x4368ac6506a785e966e00cabb073ee904a4005c9b36ff555494fd6ef935a5b1a

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 4368ac6506a785e966e00cabb073ee904a4005c9b36ff555494fd6ef935a5b1a


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://f1a0d9c2bbbcd4bed8dbab02f3807f3d2d670b428b434082587373b6b4c97258

Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.