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Claim190360972024-01-18 20:21:47377 days ago1705609307IN
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Claim190360442024-01-18 20:11:11377 days ago1705608671IN
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Salvage157240312022-10-11 9:39:47842 days ago1665481187IN
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Claim156386542022-09-29 11:18:11854 days ago1664450291IN
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Claim156343372022-09-28 20:50:59854 days ago1664398259IN
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Claim155669112022-09-19 10:16:47864 days ago1663582607IN
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Claim154007312022-08-24 4:06:07890 days ago1661313967IN
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Claim153036202022-08-08 20:08:15905 days ago1659989295IN
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Claim152457722022-07-30 19:47:56914 days ago1659210476IN
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Claim152121192022-07-25 14:07:59920 days ago1658758079IN
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Claim152042492022-07-24 8:31:26921 days ago1658651486IN
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Claim152042452022-07-24 8:30:22921 days ago1658651422IN
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Claim151627622022-07-17 22:19:00927 days ago1658096340IN
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Claim151607602022-07-17 14:44:52928 days ago1658069092IN
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Claim150118102022-06-23 7:23:27952 days ago1655969007IN
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Claim149943052022-06-20 3:16:40955 days ago1655695000IN
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Claim148835732022-06-01 7:29:09974 days ago1654068549IN
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Claim148338802022-05-24 5:13:18982 days ago1653369198IN
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Claim148160892022-05-21 7:52:17985 days ago1653119537IN
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Claim148088942022-05-20 3:51:47986 days ago1653018707IN
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Claim147912492022-05-17 7:34:52989 days ago1652772892IN
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Contract Source Code Verified (Exact Match)

Contract Name:
DegenesisAirdrop

Compiler Version
v0.8.13+commit.abaa5c0e

Optimization Enabled:
Yes with 200000 runs

Other Settings:
default evmVersion
File 1 of 5 : DegenesisAirdrop.sol
pragma solidity 0.8.13;

/***
 *@title DegenesisAirdrop
 *@author InsureDAO
 * SPDX-License-Identifier: MIT
 * 
 *@notice modified from https://github.com/Uniswap/merkle-distributor
 *
 *@dev added features
 * - ownership to salvage the unclaimed token
 * - claimable duration
 */

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "./interfaces/IMerkleDistributor.sol";
import "./test/interfaces/pool/IOwnership.sol";


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

    IOwnership public immutable ownership;
    uint256 public constant START = 1648684800; //2022-03-31 00:00:00 UTC
    uint256 public constant CLAIM_DURATION = 86400 * 365 / 2;


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

    modifier onlyOwner() {
        require(
            ownership.owner() == msg.sender,
            "Caller is not allowed to operate"
        );
        _;
    }

    constructor(address token_, bytes32 merkleRoot_, address ownership_){
        token = token_;
        merkleRoot = merkleRoot_;
        ownership = IOwnership(ownership_);
    }

    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.');
        require(block.timestamp <= START + CLAIM_DURATION, "TOO LATE");

        // 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);
    }

    function salvage() external onlyOwner{
        /**
        *@notice owner can rug-pull the unclaimed airdrop and pooled tax
        *@dev transfer to the community treasure at the end.
        */
        require(block.timestamp > START + CLAIM_DURATION, "Still in Claimable Period");

        uint256 _amount = IERC20(token).balanceOf(address(this));
        IERC20(token).transfer(msg.sender, _amount);
    }
}

File 2 of 5 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        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 3 of 5 : MerkleProof.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
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) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        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 = _efficientHash(computedHash, proofElement);
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = _efficientHash(proofElement, computedHash);
            }
        }
        return computedHash;
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

File 4 of 5 : IMerkleDistributor.sol
// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.13;

// 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 5 of 5 : IOwnership.sol
pragma solidity 0.8.13;

//SPDX-License-Identifier: MIT

interface IOwnership {
    function owner() external view returns (address);

    function futureOwner() external view returns (address);

    function commitTransferOwnership(address newOwner) external;

    function acceptTransferOwnership() external;
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"token_","type":"address"},{"internalType":"bytes32","name":"merkleRoot_","type":"bytes32"},{"internalType":"address","name":"ownership_","type":"address"}],"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":[],"name":"CLAIM_DURATION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"START","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"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":"ownership","outputs":[{"internalType":"contract IOwnership","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"salvage","outputs":[],"stateMutability":"nonpayable","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)

000000000000000000000000d83ae04c9ed29d6d3e6bf720c71bc7beb424393e5364467e2906160d23f24d922fd4383ad833ef815c6a14107b0d17f7d7ed6f4800000000000000000000000056246e83f3148b05ce2d90b44fbb4e9fa9eaf5bb

-----Decoded View---------------
Arg [0] : token_ (address): 0xd83AE04c9eD29d6D3E6Bf720C71bc7BeB424393E
Arg [1] : merkleRoot_ (bytes32): 0x5364467e2906160d23f24d922fd4383ad833ef815c6a14107b0d17f7d7ed6f48
Arg [2] : ownership_ (address): 0x56246e83F3148B05Ce2D90B44fbb4e9fa9EAF5bb

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000d83ae04c9ed29d6d3e6bf720c71bc7beb424393e
Arg [1] : 5364467e2906160d23f24d922fd4383ad833ef815c6a14107b0d17f7d7ed6f48
Arg [2] : 00000000000000000000000056246e83f3148b05ce2d90b44fbb4e9fa9eaf5bb


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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.