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Outline

• library MerkleProof
•    - function verify(bytes32[] memory proo ...
• interface IFlashToken
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transfer(address recipient, ...
•    - function transferFrom(
•    - function mint(address to, uint256 val ...
•    - function burn(uint256 value)
•    - function _msgSender()
•    - function _msgData()
•  contract Ownable is Context
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•  contract ClaimContract is Ownable *
•    - function updateRootAndTime(bytes32 ro ...
•    - function isClaimed(uint256 index)
•    - function _setClaimed(uint256 index)
•    - function claim(
•    - function destroy()

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/**
 *Submitted for verification at Etherscan.io on 2020-12-22
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;


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;
    }
}


interface IFlashToken {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    function mint(address to, uint256 value) external returns (bool);

    function burn(uint256 value) external returns (bool);
}


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;
    }
}


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;
    }
}




contract ClaimContract is Ownable{
    using MerkleProof for bytes;
    uint256 public EXPIRY_TIME;
    address public FLASH_CONTRACT;
    bytes32 public merkleRoot;
    mapping(uint256 => uint256) private claimedBitMap;

    event Claimed(uint256 index, address sender, uint256 amount);
    
    constructor(address contractAddress, bytes32 rootHash, uint256 totalDays) public {
        FLASH_CONTRACT = contractAddress;
        merkleRoot = rootHash;
        EXPIRY_TIME = block.timestamp + totalDays;
    }

    function updateRootAndTime(bytes32 rootHash, uint256 totalDays) external onlyOwner {
        merkleRoot = rootHash;
        EXPIRY_TIME = block.timestamp + totalDays;
        renounceOwnership();
    }

    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(block.timestamp <= EXPIRY_TIME, "MerkleDistributor: Deadline expired");

        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(IFlashToken(FLASH_CONTRACT).mint(account, amount), "MerkleDistributor: Transfer failed.");

        emit Claimed(index, account, amount);
    }

    function destroy() external {
        require(block.timestamp >= EXPIRY_TIME, "MerkleDistributor: Deadline not expired");
        selfdestruct(address(0));
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"bytes32","name":"rootHash","type":"bytes32"},{"internalType":"uint256","name":"totalDays","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"index","type":"uint256"},{"indexed":false,"internalType":"address","name":"sender","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":"EXPIRY_TIME","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FLASH_CONTRACT","outputs":[{"internalType":"address","name":"","type":"address"}],"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":[],"name":"destroy","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":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"rootHash","type":"bytes32"},{"internalType":"uint256","name":"totalDays","type":"uint256"}],"name":"updateRootAndTime","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000b4467e8d621105312a914f1d42f10770c0ffe3c867c9d478aec65eab1e4126f9decefb4d9f975b423d9f5ecd14b1ec71c06f03190000000000000000000000000000000000000000000000000000000000055f7a

-----Decoded View---------------
Arg [0] : contractAddress (address): 0xB4467E8D621105312a914F1D42f10770C0Ffe3c8
Arg [1] : rootHash (bytes32): 0x67c9d478aec65eab1e4126f9decefb4d9f975b423d9f5ecd14b1ec71c06f0319
Arg [2] : totalDays (uint256): 352122

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000b4467e8d621105312a914f1d42f10770c0ffe3c8
Arg [1] : 67c9d478aec65eab1e4126f9decefb4d9f975b423d9f5ecd14b1ec71c06f0319
Arg [2] : 0000000000000000000000000000000000000000000000000000000000055f7a

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