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Contract

0xB5774c5167243034c7eDf4Ec4201C41C85715596
 

Overview

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0 ETH

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$0.00

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Claim163100252023-01-01 6:08:23704 days ago1672553303IN
0xB5774c51...C85715596
0 ETH0.00109114.31654007
Claim161125242022-12-04 16:05:35732 days ago1670169935IN
0xB5774c51...C85715596
0 ETH0.0012258313.01503146
Claim159172672022-11-07 9:31:59759 days ago1667813519IN
0xB5774c51...C85715596
0 ETH0.000667211.1248403
Claim157741772022-10-18 9:43:59779 days ago1666086239IN
0xB5774c51...C85715596
0 ETH0.0019263525
Claim157387702022-10-13 11:02:59784 days ago1665658979IN
0xB5774c51...C85715596
0 ETH0.0004506613.41737158
Claim157387702022-10-13 11:02:59784 days ago1665658979IN
0xB5774c51...C85715596
0 ETH0.000967212.56079115
Claim152831262022-08-05 15:23:29853 days ago1659713009IN
0xB5774c51...C85715596
0 ETH0.0011902315.60885754
Claim150684082022-07-03 8:11:06886 days ago1656835866IN
0xB5774c51...C85715596
0 ETH0.000727289.44160421
Claim145485902022-04-09 1:36:22971 days ago1649468182IN
0xB5774c51...C85715596
0 ETH0.0041772654.19806658
Claim138797262021-12-26 8:29:201075 days ago1640507360IN
0xB5774c51...C85715596
0 ETH0.0039215251.46768394
Claim138746342021-12-25 13:35:411076 days ago1640439341IN
0xB5774c51...C85715596
0 ETH0.0052432368.08682674
Claim137323132021-12-03 7:36:251098 days ago1638516985IN
0xB5774c51...C85715596
0 ETH0.0049802365.32661344
Claim136352722021-11-17 20:57:291113 days ago1637182649IN
0xB5774c51...C85715596
0 ETH0.0088596115
Claim134758212021-10-23 19:53:301138 days ago1635018810IN
0xB5774c51...C85715596
0 ETH0.0047043961.05158679
Claim134735562021-10-23 11:46:151139 days ago1634989575IN
0xB5774c51...C85715596
0 ETH0.0041944455.03364608
Claim133979442021-10-11 14:53:461151 days ago1633964026IN
0xB5774c51...C85715596
0 ETH0.00886978116.41056355
Claim133539412021-10-04 17:23:471158 days ago1633368227IN
0xB5774c51...C85715596
0 ETH0.00850039110.31159289
Claim132531392021-09-19 1:08:031173 days ago1632013683IN
0xB5774c51...C85715596
0 ETH0.0037451448.61420632
Claim132234542021-09-14 11:02:451178 days ago1631617365IN
0xB5774c51...C85715596
0 ETH0.0031315440.66306886
Claim131979522021-09-10 12:16:221182 days ago1631276182IN
0xB5774c51...C85715596
0 ETH0.0054859972.05335677
Claim131937142021-09-09 20:28:001182 days ago1631219280IN
0xB5774c51...C85715596
0 ETH0.00950531101
Claim131936992021-09-09 20:25:181182 days ago1631219118IN
0xB5774c51...C85715596
0 ETH0.00972473126.2395339
Claim131910522021-09-09 10:40:311183 days ago1631184031IN
0xB5774c51...C85715596
0 ETH0.0062169980.69405912
Claim131716642021-09-06 10:39:571186 days ago1630924797IN
0xB5774c51...C85715596
0 ETH0.0078249483.13793911
Claim131439302021-09-02 3:39:451190 days ago1630553985IN
0xB5774c51...C85715596
0 ETH0.0045500959.08441614
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Contract Source Code Verified (Exact Match)

Contract Name:
MerkleDistributor

Compiler Version
v0.7.4+commit.3f05b770

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Unlicense license
/**
 *Submitted for verification at Etherscan.io on 2021-05-31
*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity 0.7.4;



// Part: IMerkleDistributor

// 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 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);
}

// Part: OpenZeppelin/[email protected]/IERC20

/**
 * @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);
}

// Part: OpenZeppelin/[email protected]/MerkleProof

/**
 * @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: MerkleDistributor.sol

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

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

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

    function isClaimed(uint256 index) public view override 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(!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);
    }
}

Contract Security Audit

Contract ABI

[{"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"},{"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":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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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)

000000000000000000000000dada00a9c23390112d08a1377cc59f7d03d9df552ab2ae4f54cf47d5e0376e9fd4deb47e6fcaa926fec6673c91d0da7caf1fda80

-----Decoded View---------------
Arg [0] : token_ (address): 0xDADA00A9C23390112D08a1377cc59f7d03D9df55
Arg [1] : merkleRoot_ (bytes32): 0x2ab2ae4f54cf47d5e0376e9fd4deb47e6fcaa926fec6673c91d0da7caf1fda80

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000dada00a9c23390112d08a1377cc59f7d03d9df55
Arg [1] : 2ab2ae4f54cf47d5e0376e9fd4deb47e6fcaa926fec6673c91d0da7caf1fda80


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