ETH Price: $3,133.12 (-2.37%)
Gas: 10 Gwei

Contract

0x4b3EDb22952Fb4A70140E39FB1adD05A6B49622B
 
Transaction Hash
Method
Block
From
To
Value
Claim183637782023-10-16 15:17:11191 days ago1697469431IN
Lido: Early Stakers Airdrop
0 ETH0.001911511.7260199
Claim178432482023-08-04 17:56:47264 days ago1691171807IN
Lido: Early Stakers Airdrop
0 ETH0.0043903328.83865239
Claim174436472023-06-09 15:45:47320 days ago1686325547IN
Lido: Early Stakers Airdrop
0 ETH0.0035579621.82449584
Claim174312082023-06-07 21:39:11321 days ago1686173951IN
Lido: Early Stakers Airdrop
0 ETH0.0006295821
Claim173845722023-06-01 7:47:11328 days ago1685605631IN
Lido: Early Stakers Airdrop
0 ETH0.0008080329.06489355
Claim173845642023-06-01 7:45:35328 days ago1685605535IN
Lido: Early Stakers Airdrop
0 ETH0.0008151429.32084928
Claim173815072023-05-31 21:26:23328 days ago1685568383IN
Lido: Early Stakers Airdrop
0 ETH0.0008340330
Claim162851162022-12-28 18:42:47483 days ago1672252967IN
Lido: Early Stakers Airdrop
0 ETH0.0026233915.93277964
Claim152783472022-08-04 21:48:52628 days ago1659649732IN
Lido: Early Stakers Airdrop
0 ETH0.000270349.01753484
Claim152783462022-08-04 21:48:42628 days ago1659649722IN
Lido: Early Stakers Airdrop
0 ETH0.001347978.18743199
Claim147872422022-05-16 16:12:51709 days ago1652717571IN
Lido: Early Stakers Airdrop
0 ETH0.005296532.16476785
Claim146708512022-04-28 4:53:42727 days ago1651121622IN
Lido: Early Stakers Airdrop
0 ETH0.0076124849.99595386
Claim145293722022-04-06 1:15:48749 days ago1649207748IN
Lido: Early Stakers Airdrop
0 ETH0.0128426277.9900469
Claim144471622022-03-24 5:46:58762 days ago1648100818IN
Lido: Early Stakers Airdrop
0 ETH0.0045958728.18901081
Claim141828952022-02-11 5:37:07803 days ago1644557827IN
Lido: Early Stakers Airdrop
0 ETH0.0085390952.38130299
Claim139034572021-12-30 0:26:41846 days ago1640824001IN
Lido: Early Stakers Airdrop
0 ETH0.02983502181.21814136
Claim138943562021-12-28 14:47:46848 days ago1640702866IN
Lido: Early Stakers Airdrop
0 ETH0.0153904693.47380322
Claim138799812021-12-26 9:25:03850 days ago1640510703IN
Lido: Early Stakers Airdrop
0 ETH0.0076880246.6936805
Claim137899062021-12-12 11:04:37864 days ago1639307077IN
Lido: Early Stakers Airdrop
0 ETH0.0088302658
Claim136324452021-11-17 10:38:24889 days ago1637145504IN
Lido: Early Stakers Airdrop
0 ETH0.02020724122.72849578
Claim134660442021-10-22 7:15:02915 days ago1634886902IN
Lido: Early Stakers Airdrop
0 ETH0.0060911240.000001
Claim134485982021-10-19 13:52:34918 days ago1634651554IN
Lido: Early Stakers Airdrop
0 ETH0.0095320657.89148665
Claim132534932021-09-19 2:28:56948 days ago1632018536IN
Lido: Early Stakers Airdrop
0 ETH0.0069436142.16427407
Claim131876662021-09-08 21:54:44958 days ago1631138084IN
Lido: Early Stakers Airdrop
0 ETH0.01816082111.42018001
Claim131204452021-08-29 12:46:31969 days ago1630241191IN
Lido: Early Stakers Airdrop
0 ETH0.0079635653
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Contract Source Code Verified (Exact Match)

Contract Name:
MerkleDistributor

Compiler Version
v0.6.11+commit.5ef660b1

Optimization Enabled:
Yes with 200 runs

Other Settings:
constantinople EvmVersion, GNU GPLv3 license
/**
 *Submitted for verification at Etherscan.io on 2021-01-04
*/

// SPDX-License-Identifier: MIT AND UNLICENSED
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


pragma solidity ^0.6.0;

/**
 * @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 ^0.6.0;

/**
 * @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

// Copied from: https://github.com/Uniswap/merkle-distributor

pragma solidity >=0.5.0;

// 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);
}

// File: contracts/MerkleDistributor.sol

// Copied from: https://github.com/Uniswap/merkle-distributor

pragma solidity =0.6.11;




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)

0000000000000000000000005a98fcbea516cf06857215779fd812ca3bef1b32eff1326464cbd9a7c317d8d3c7cacaf78c7511441324846c67f7e1ec9fdd0315

-----Decoded View---------------
Arg [0] : token_ (address): 0x5A98FcBEA516Cf06857215779Fd812CA3beF1B32
Arg [1] : merkleRoot_ (bytes32): 0xeff1326464cbd9a7c317d8d3c7cacaf78c7511441324846c67f7e1ec9fdd0315

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000005a98fcbea516cf06857215779fd812ca3bef1b32
Arg [1] : eff1326464cbd9a7c317d8d3c7cacaf78c7511441324846c67f7e1ec9fdd0315


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://abef3a763c82cf1e24c986a51b75f215a4e67f928504bd92768afe89e575c0c6

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