Address Details
contract
0x8b4eCf9d2e49Fb11782f8B4b0f3051A1F72E1C8D
- Contract Name
- Airdrop
- Creator
- 0x0659f7–9a04df at 0x12257e–dca21f
- Balance
- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 1 Transactions
- Transfers
- 1 Transfers
- Gas Used
- 21,000
- Last Balance Update
- 11145161
Transactions
Token Transfers
Internal Transactions
Coin Balance History
Logs
Code
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Write Contract
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- Contract name:
- Airdrop
- Optimization enabled
- false
- Compiler version
- v0.6.12+commit.27d51765
- EVM Version
- istanbul
- Verified at
- 2023-03-15T06:20:49.019491Z
project:/contracts/Airdrop.sol
// SPDX-License-Identifier: MIT pragma solidity >=0.6.11 <0.9.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/cryptography/MerkleProof.sol"; import "./interfaces/IMerkleDistributor.sol"; contract Airdrop is IMerkleDistributor { address public immutable override token; bytes32 public immutable override merkleRoot; event Initialized(address token, bytes32 merkleRoot); mapping(uint256 => uint256) private claimedBitMap; constructor(address token_, bytes32 merkleRoot_) public { emit Initialized(token_, merkleRoot_); 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.'); bytes32 node = keccak256(abi.encodePacked(index, account, amount)); require(MerkleProof.verify(merkleProof, merkleRoot, node), 'MerkleDistributor: Invalid proof.'); _setClaimed(index); require(IERC20(token).transfer(account, amount), 'MerkleDistributor: Transfer failed.'); emit Claimed(index, account, amount); } }
/_openzeppelin/contracts/cryptography/MerkleProof.sol
// SPDX-License-Identifier: MIT 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; } }
/_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); }
/project_/contracts/interfaces/IMerkleDistributor.sol
// 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); }
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"token_","internalType":"address"},{"type":"bytes32","name":"merkleRoot_","internalType":"bytes32"}]},{"type":"event","name":"Claimed","inputs":[{"type":"uint256","name":"index","internalType":"uint256","indexed":false},{"type":"address","name":"account","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Initialized","inputs":[{"type":"address","name":"token","internalType":"address","indexed":false},{"type":"bytes32","name":"merkleRoot","internalType":"bytes32","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"claim","inputs":[{"type":"uint256","name":"index","internalType":"uint256"},{"type":"address","name":"account","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes32[]","name":"merkleProof","internalType":"bytes32[]"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isClaimed","inputs":[{"type":"uint256","name":"index","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"merkleRoot","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"token","inputs":[]}]
Contract Creation Code
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Deployed ByteCode
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