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pragma solidity ^0.5.16;

import "openzeppelin-solidity-2.3.0/contracts/token/ERC20/IERC20.sol";
import "synthetix-2.43.1/contracts/Owned.sol";
import "openzeppelin-solidity-2.3.0/contracts/cryptography/MerkleProof.sol";
import "synthetix-2.43.1/contracts/Pausable.sol";

/**
 * Contract which implements a merkle airdrop for a given token
 * Based on an account balance snapshot stored in a merkle tree
 */
contract Airdrop is Owned, Pausable {
    IERC20 public token;

    bytes32 public root; // merkle tree root

    uint256 public startTime;

    mapping(uint256 => uint256) public _claimed;

    constructor(
        address _owner,
        IERC20 _token,
        bytes32 _root
    ) public Owned(_owner) Pausable() {
        token = _token;
        root = _root;
        startTime = block.timestamp;
    }

    // Check if a given reward has already been claimed
    function claimed(uint256 index) public view returns (uint256 claimedBlock, uint256 claimedMask) {
        claimedBlock = _claimed[index / 256];
        claimedMask = (uint256(1) << uint256(index % 256));
        require((claimedBlock & claimedMask) == 0, "Tokens have already been claimed");
    }

    // helper for the dapp
    function canClaim(uint256 index) external view returns (bool) {
        uint256 claimedBlock = _claimed[index / 256];
        uint256 claimedMask = (uint256(1) << uint256(index % 256));
        return ((claimedBlock & claimedMask) == 0);
    }

    // Get airdrop tokens assigned to address
    // Requires sending merkle proof to the function
    function claim(
        uint256 index,
        uint256 amount,
        bytes32[] memory merkleProof
    ) public notPaused {
        require(token.balanceOf(address(this)) > amount, "Contract doesnt have enough tokens");

        // Make sure the tokens have not already been redeemed
        (uint256 claimedBlock, uint256 claimedMask) = claimed(index);
        _claimed[index / 256] = claimedBlock | claimedMask;

        // Compute the merkle leaf from index, recipient and amount
        bytes32 leaf = keccak256(abi.encodePacked(index, msg.sender, amount));
        // verify the proof is valid
        require(MerkleProof.verify(merkleProof, root, leaf), "Proof is not valid");
        // Redeem!
        token.transfer(msg.sender, amount);
        emit Claim(msg.sender, amount, block.timestamp);
    }

    function _selfDestruct(address payable beneficiary) external onlyOwner {
        //only callable a year after end time
        require(block.timestamp > (startTime + 365 days), "Contract can only be selfdestruct after a year");

        token.transfer(beneficiary, token.balanceOf(address(this)));

        selfdestruct(beneficiary);
    }

    event Claim(address claimer, uint256 amount, uint timestamp);
}

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
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.
     *
     * > 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);
}

pragma solidity ^0.5.16;

// https://docs.synthetix.io/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}

pragma solidity ^0.5.0;

/**
 * @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;
    }
}

pragma solidity ^0.5.16;

// Inheritance
import "./Owned.sol";

// https://docs.synthetix.io/contracts/source/contracts/pausable
contract Pausable is Owned {
    uint public lastPauseTime;
    bool public paused;

    constructor() internal {
        // This contract is abstract, and thus cannot be instantiated directly
        require(owner != address(0), "Owner must be set");
        // Paused will be false, and lastPauseTime will be 0 upon initialisation
    }

    /**
     * @notice Change the paused state of the contract
     * @dev Only the contract owner may call this.
     */
    function setPaused(bool _paused) external onlyOwner {
        // Ensure we're actually changing the state before we do anything
        if (_paused == paused) {
            return;
        }

        // Set our paused state.
        paused = _paused;

        // If applicable, set the last pause time.
        if (paused) {
            lastPauseTime = now;
        }

        // Let everyone know that our pause state has changed.
        emit PauseChanged(paused);
    }

    event PauseChanged(bool isPaused);

    modifier notPaused {
        require(!paused, "This action cannot be performed while the contract is paused");
        _;
    }
}

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

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0000000000000000000000004d03ef005e5f559fc9294a8e1cebba09284b1f8200000000000000000000000003e173ad8d1581a4802d3b532ace27a62c5b81dce212822f56abd96dd8e013f1b70b78b68bbc15d40ce1a5c3d1c4a14ee4a2899a

-----Decoded View---------------
Arg [0] : _owner (address): 0x4D03eF005e5f559fc9294a8E1CeBbA09284B1F82
Arg [1] : _token (address): 0x03E173Ad8d1581A4802d3B532AcE27a62c5B81dc
Arg [2] : _root (bytes32): 0xe212822f56abd96dd8e013f1b70b78b68bbc15d40ce1a5c3d1c4a14ee4a2899a

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000004d03ef005e5f559fc9294a8e1cebba09284b1f82
Arg [1] : 00000000000000000000000003e173ad8d1581a4802d3b532ace27a62c5b81dc
Arg [2] : e212822f56abd96dd8e013f1b70b78b68bbc15d40ce1a5c3d1c4a14ee4a2899a