Overview
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0 ETH
Eth Value
$0.00More Info
Private Name Tags
ContractCreator
Latest 25 from a total of 2,448 transactions
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Claim | 11243977 | 1402 days ago | IN | 0 ETH | 0.00045903 | ||||
Claim | 11236156 | 1403 days ago | IN | 0 ETH | 0.00078104 | ||||
Claim | 11218979 | 1406 days ago | IN | 0 ETH | 0.00046886 | ||||
Claim | 11214990 | 1407 days ago | IN | 0 ETH | 0.00060078 | ||||
Claim | 11195558 | 1410 days ago | IN | 0 ETH | 0.00059079 | ||||
Claim | 11193707 | 1410 days ago | IN | 0 ETH | 0.00094437 | ||||
Claim | 11193707 | 1410 days ago | IN | 0 ETH | 0.0009118 | ||||
Claim | 11193707 | 1410 days ago | IN | 0 ETH | 0.00078154 | ||||
Claim | 11186326 | 1411 days ago | IN | 0 ETH | 0.00049164 | ||||
Claim | 11180427 | 1412 days ago | IN | 0 ETH | 0.00065102 | ||||
Claim | 11179033 | 1412 days ago | IN | 0 ETH | 0.00050456 | ||||
Claim | 11174046 | 1413 days ago | IN | 0 ETH | 0.0010015 | ||||
Claim | 11172460 | 1413 days ago | IN | 0 ETH | 0.00052422 | ||||
Claim | 11172460 | 1413 days ago | IN | 0 ETH | 0.00052422 | ||||
Claim | 11172460 | 1413 days ago | IN | 0 ETH | 0.00050456 | ||||
Claim | 11172375 | 1413 days ago | IN | 0 ETH | 0.00153686 | ||||
Claim | 11171944 | 1413 days ago | IN | 0 ETH | 0.00084581 | ||||
Claim | 11171465 | 1413 days ago | IN | 0 ETH | 0.00105203 | ||||
Claim | 11171465 | 1413 days ago | IN | 0 ETH | 0.00100694 | ||||
Claim | 11171429 | 1413 days ago | IN | 0 ETH | 0.00652197 | ||||
Claim | 11171416 | 1413 days ago | IN | 0 ETH | 0.00115388 | ||||
Transfer | 11171349 | 1413 days ago | IN | 0 ETH | 0.000399 | ||||
Claim | 11171328 | 1413 days ago | IN | 0 ETH | 0.0010754 | ||||
Claim | 11171304 | 1413 days ago | IN | 0 ETH | 0.00121866 | ||||
Claim | 11171295 | 1413 days ago | IN | 0 ETH | 0.00070166 |
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Contract Name:
MerkleDistributor
Compiler Version
v0.6.12+commit.27d51765
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2020-10-31 */ // File: @openzeppelin\contracts\token\ERC20\IERC20.sol // SPDX-License-Identifier: MIT 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 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 pragma solidity 0.6.12; 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
- No Contract Security Audit Submitted- Submit Audit Here
[{"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"}]
Contract Creation Code
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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)
000000000000000000000000b78b3320493a4efaa1028130c5ba26f0b6085ef873b5e29ac01a492cc4b4ac2729b2105571cf30a30009886ed366733264d9fc90
-----Decoded View---------------
Arg [0] : token_ (address): 0xb78B3320493a4EFaa1028130C5Ba26f0B6085Ef8
Arg [1] : merkleRoot_ (bytes32): 0x73b5e29ac01a492cc4b4ac2729b2105571cf30a30009886ed366733264d9fc90
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000b78b3320493a4efaa1028130c5ba26f0b6085ef8
Arg [1] : 73b5e29ac01a492cc4b4ac2729b2105571cf30a30009886ed366733264d9fc90
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://0bc22750f8b8e20cb35b84efec14b92b750788a28849da6ffa78648c97fa223d
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