Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2020-12-07
*/

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


pragma solidity ^0.7.0;

/**
 * @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);
}

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


pragma solidity ^0.7.0;

/**
 * @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;
    }
}

// File: contracts/interfaces/IMerkleDistributor.sol

pragma solidity ^0.7.4;

// Allows anyone to claim a token if they exist in a merkle root.
interface IMerkleDistributor {
    // Returns the address of the token distributed by this contract.
    function token() external view returns (address);

    // Returns the merkle root of the merkle tree containing account balances available to claim.
    function merkleRoot() external view returns (bytes32);

    // Returns the start time of distribution
    function startTime() external view returns (uint256);

    // Returns true if the index has been marked claimed.
    function isClaimed(uint256 index) external view returns (bool);

    // Claim the given amount of the token to the given address. Reverts if the inputs are invalid.
    function claim(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof
    ) external;

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

// File: contracts/distributor/MerkleDistributor.sol

pragma solidity ^0.7.4;




contract MerkleDistributor is IMerkleDistributor {
    address public immutable override token;
    bytes32 public immutable override merkleRoot;
    uint256 public immutable override startTime;

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

    constructor(address token_, bytes32 merkleRoot_, uint256 startTime_) {
        token = token_;
        merkleRoot = merkleRoot_;
        startTime = startTime_;
    }

    function isClaimed(uint256 index) public override 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 override {
        require(block.timestamp >= startTime, "MerkleDistributor: Distribution not started yet");
        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);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"token_","type":"address"},{"internalType":"bytes32","name":"merkleRoot_","type":"bytes32"},{"internalType":"uint256","name":"startTime_","type":"uint256"}],"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"},{"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":"startTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

60e060405234801561001057600080fd5b506040516106ed3803806106ed8339818101604052606081101561003357600080fd5b5080516020820151604090920151606082901b6001600160601b03191660805260a083905260c08190526001600160a01b03909116919061065161009c60003980610163528061044452508061028152806104205250806102f2528061048e52506106516000f3fe608060405234801561001057600080fd5b50600436106100575760003560e01c80632e7ba6ef1461005c5780632eb4a7ab146100ea57806378e97925146101045780639e34070f1461010c578063fc0c546a1461013d575b600080fd5b6100e86004803603608081101561007257600080fd5b8135916001600160a01b0360208201351691604082013591908101906080810160608201356401000000008111156100a957600080fd5b8201836020820111156100bb57600080fd5b803590602001918460208302840111640100000000831117156100dd57600080fd5b509092509050610161565b005b6100f261041e565b60408051918252519081900360200190f35b6100f2610442565b6101296004803603602081101561012257600080fd5b5035610466565b604080519115158252519081900360200190f35b61014561048c565b604080516001600160a01b039092168252519081900360200190f35b7f00000000000000000000000000000000000000000000000000000000000000004210156101c05760405162461bcd60e51b815260040180806020018281038252602f8152602001806105ed602f913960400191505060405180910390fd5b6101c985610466565b156102055760405162461bcd60e51b81526004018080602001828103825260288152602001806105816028913960400191505060405180910390fd5b600085858560405160200180848152602001836001600160a01b031660601b815260140182815260200193505050506040516020818303038152906040528051906020012090506102ac8383808060200260200160405190810160405280939291908181526020018383602002808284376000920191909152507f000000000000000000000000000000000000000000000000000000000000000092508591506104b09050565b6102e75760405162461bcd60e51b81526004018080602001828103825260218152602001806105a96021913960400191505060405180910390fd5b6102f086610559565b7f00000000000000000000000000000000000000000000000000000000000000006001600160a01b031663a9059cbb86866040518363ffffffff1660e01b815260040180836001600160a01b0316815260200182815260200192505050602060405180830381600087803b15801561036757600080fd5b505af115801561037b573d6000803e3d6000fd5b505050506040513d602081101561039157600080fd5b50516103ce5760405162461bcd60e51b81526004018080602001828103825260238152602001806105ca6023913960400191505060405180910390fd5b604080518781526001600160a01b038716602082015280820186905290517f4ec90e965519d92681267467f775ada5bd214aa92c0dc93d90a5e880ce9ed0269181900360600190a1505050505050565b7f000000000000000000000000000000000000000000000000000000000000000081565b7f000000000000000000000000000000000000000000000000000000000000000081565b6101008104600090815260208190526040902054600160ff9092169190911b9081161490565b7f000000000000000000000000000000000000000000000000000000000000000081565b600081815b855181101561054e5760008682815181106104cc57fe5b602002602001015190508083116105135782816040516020018083815260200182815260200192505050604051602081830303815290604052805190602001209250610545565b808360405160200180838152602001828152602001925050506040516020818303038152906040528051906020012092505b506001016104b5565b509092149392505050565b610100810460009081526020819052604090208054600160ff9093169290921b909117905556fe4d65726b6c654469737472696275746f723a2044726f7020616c726561647920636c61696d65642e4d65726b6c654469737472696275746f723a20496e76616c69642070726f6f662e4d65726b6c654469737472696275746f723a205472616e73666572206661696c65642e4d65726b6c654469737472696275746f723a20446973747269627574696f6e206e6f74207374617274656420796574a2646970667358221220269e02b8d1b0fb78971999ccb974e9eff95b000ba800e2b7795edf29b4bd6fbf64736f6c6343000704003300000000000000000000000009a3ecafa817268f77be1283176b946c4ff2e60849a1e0e885953b96669a39bf383afabf9b604df593c34285c6f1664fbb400ee5000000000000000000000000000000000000000000000000000000005fc935b0

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

00000000000000000000000009a3ecafa817268f77be1283176b946c4ff2e60849a1e0e885953b96669a39bf383afabf9b604df593c34285c6f1664fbb400ee5000000000000000000000000000000000000000000000000000000005fc935b0

-----Decoded View---------------
Arg [0] : token_ (address): 0x09a3EcAFa817268f77BE1283176B946C4ff2E608
Arg [1] : merkleRoot_ (bytes32): 0x49a1e0e885953b96669a39bf383afabf9b604df593c34285c6f1664fbb400ee5
Arg [2] : startTime_ (uint256): 1607022000

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000009a3ecafa817268f77be1283176b946c4ff2e608
Arg [1] : 49a1e0e885953b96669a39bf383afabf9b604df593c34285c6f1664fbb400ee5
Arg [2] : 000000000000000000000000000000000000000000000000000000005fc935b0

5342:1977:0:-:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6450:866;;;;;;;;;;;;;;;;;;;-1:-1:-1;;;;;6450:866:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;-1:-1:-1;6450:866:0;;-1:-1:-1;6450:866:0;-1:-1:-1;6450:866:0;:::i;:::-;;5444:44;;;:::i;:::-;;;;;;;;;;;;;;;;5495:43;;;:::i;5827:331::-;;;;;;;;;;;;;;;;-1:-1:-1;5827:331:0;;:::i;:::-;;;;;;;;;;;;;;;;;;5398:39;;;:::i;:::-;;;;-1:-1:-1;;;;;5398:39:0;;;;;;;;;;;;;;6450:866;6644:9;6625:15;:28;;6617:88;;;;-1:-1:-1;;;6617:88:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6725:16;6735:5;6725:9;:16::i;:::-;6724:17;6716:70;;;;-1:-1:-1;;;6716:70:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6836:12;6878:5;6885:7;6894:6;6861:40;;;;;;;;;;;-1:-1:-1;;;;;6861:40:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6851:51;;;;;;6836:66;;6935:49;6954:11;;6935:49;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;-1:-1:-1;6967:10:0;;-1:-1:-1;6979:4:0;;-1:-1:-1;6935:18:0;;-1:-1:-1;6935:49:0:i;:::-;6913:132;;;;-1:-1:-1;;;6913:132:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;7106:18;7118:5;7106:11;:18::i;:::-;7164:5;-1:-1:-1;;;;;7157:22:0;;7180:7;7189:6;7157:39;;;;;;;;;;;;;-1:-1:-1;;;;;7157:39:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;-1:-1:-1;7157:39:0;7135:124;;;;-1:-1:-1;;;7135:124:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;7277:31;;;;;;-1:-1:-1;;;;;7277:31:0;;;;;;;;;;;;;;;;;;;;;;;6450:866;;;;;;:::o;5444:44::-;;;:::o;5495:43::-;;;:::o;5827:331::-;5943:3;5935:11;;5891:4;6027:31;;;;;;;;;;;6085:1;5983:11;;;;6085:20;;;;6124:18;;;:26;;5827:331::o;5398:39::-;;;:::o;3344:796::-;3435:4;3475;3435;3492:525;3516:5;:12;3512:1;:16;3492:525;;;3550:20;3573:5;3579:1;3573:8;;;;;;;;;;;;;;3550:31;;3618:12;3602;:28;3598:408;;3772:12;3786;3755:44;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;3745:55;;;;;;3730:70;;3598:408;;;3962:12;3976;3945:44;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;3935:55;;;;;;3920:70;;3598:408;-1:-1:-1;3530:3:0;;3492:525;;;-1:-1:-1;4112:20:0;;;;3344:796;-1:-1:-1;;;3344:796:0:o;6166:276::-;6256:3;6248:11;;6221:24;6365:31;;;;;;;;;;;;6413:1;6296:11;;;;6413:20;;;;6365:69;;;6318:116;;6166:276::o

ipfs://269e02b8d1b0fb78971999ccb974e9eff95b000ba800e2b7795edf29b4bd6fbf