ETH Price: $2,931.55 (-3.02%)
Gas: 37 Gwei

Contract

0xDD111F0fc07F4D89ED6ff96DBAB19a61450b8435
 

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Claim190702162024-01-23 15:19:1130 days 18 hrs ago1706023151IN
Index Protocol: Early Community Rewards
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0 ETH0.0021058627.21846063
Claim188814862023-12-28 3:37:4757 days 5 hrs ago1703734667IN
Index Protocol: Early Community Rewards
0 ETH0.0015991520.65799937
Claim175923222023-06-30 13:14:59237 days 20 hrs ago1688130899IN
Index Protocol: Early Community Rewards
0 ETH0.0028367236.66204645
Claim171205442023-04-25 3:15:59304 days 6 hrs ago1682392559IN
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0 ETH0.0025274232.65283227
Claim169937122023-04-07 2:36:23322 days 7 hrs ago1680834983IN
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Claim169917992023-04-06 20:05:35322 days 13 hrs ago1680811535IN
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0 ETH0.0031635940.88012815
Claim163192792023-01-02 13:06:47416 days 20 hrs ago1672664807IN
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Claim161185682022-12-05 12:20:47444 days 21 hrs ago1670242847IN
Index Protocol: Early Community Rewards
0 ETH0.0010723313.86211392
Claim154092282022-08-25 13:01:21546 days 20 hrs ago1661432481IN
Index Protocol: Early Community Rewards
0 ETH0.000971612.55454407
Claim147153802022-05-05 5:19:33659 days 4 hrs ago1651727973IN
Index Protocol: Early Community Rewards
0 ETH0.0031418240.58631081
Claim145919332022-04-15 19:49:05678 days 13 hrs ago1650052145IN
Index Protocol: Early Community Rewards
0 ETH0.0069346389.59134857
Claim139741402022-01-09 22:56:08774 days 10 hrs ago1641768968IN
Index Protocol: Early Community Rewards
0 ETH0.00958093123.76715614
Claim139671582022-01-08 21:16:13775 days 12 hrs ago1641676573IN
Index Protocol: Early Community Rewards
0 ETH0.01358409175.60264529
Claim139591952022-01-07 15:47:59776 days 17 hrs ago1641570479IN
Index Protocol: Early Community Rewards
0 ETH0.01349367174.26710328
Claim139291932022-01-03 0:05:39781 days 9 hrs ago1641168339IN
Index Protocol: Early Community Rewards
0 ETH0.00849853113.45448109
Claim138808962021-12-26 12:44:13788 days 20 hrs ago1640522653IN
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0 ETH0.0025669733.16039711
Claim138792542021-12-26 6:42:36789 days 2 hrs ago1640500956IN
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0 ETH0.0034717846.34793042
Claim138357932021-12-19 13:11:42795 days 20 hrs ago1639919502IN
Index Protocol: Early Community Rewards
0 ETH0.0028257536.51362204
Claim138174432021-12-16 17:09:22798 days 16 hrs ago1639674562IN
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0 ETH0.01183307157.92802372
Claim138148652021-12-16 7:34:31799 days 2 hrs ago1639640071IN
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0 ETH0.0038645849.90744953
Claim138109982021-12-15 17:13:35799 days 16 hrs ago1639588415IN
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0 ETH0.01099345141.98849763
Claim137632432021-12-08 6:22:06807 days 3 hrs ago1638944526IN
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Claim137155752021-11-30 15:33:36814 days 18 hrs ago1638286416IN
Index Protocol: Early Community Rewards
0 ETH0.007964102.89284844
Claim137153372021-11-30 14:37:32814 days 18 hrs ago1638283052IN
Index Protocol: Early Community Rewards
0 ETH0.0061632279.59637152
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Contract Source Code Verified (Exact Match)

Contract Name:
MerkleDistributor

Compiler Version
v0.6.10+commit.00c0fcaf

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at Etherscan.io on 2020-10-06
*/

// Dependency file: contracts/interfaces/IMerkleDistributor.sol



// pragma solidity ^0.6.10;

// 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);
}
// Dependency 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;
    }
}

// Dependency 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);
}


pragma solidity ^0.6.10;

// import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import { MerkleProof } from "@openzeppelin/contracts/cryptography/MerkleProof.sol";
// import { IMerkleDistributor } from "../interfaces/IMerkleDistributor.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)

0000000000000000000000000954906da0bf32d5479e25f46056d22f08464cab0f2cabbe50fc2d5d46f34ead7924313782cfc6c19a6ae31aa5883628a523f5db

-----Decoded View---------------
Arg [0] : token_ (address): 0x0954906da0Bf32d5479e25f46056d22f08464cab
Arg [1] : merkleRoot_ (bytes32): 0x0f2cabbe50fc2d5d46f34ead7924313782cfc6c19a6ae31aa5883628a523f5db

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000954906da0bf32d5479e25f46056d22f08464cab
Arg [1] : 0f2cabbe50fc2d5d46f34ead7924313782cfc6c19a6ae31aa5883628a523f5db


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://6435ab0784c767a848d5273cdea01f0c3f168db5ae601706dd2f3f077d2a5218

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