🪂 Airdrop Contract 🪂

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This Solidity smart contract implements an airdrop functionality for distributing tokens to multiple users based on a Merkle tree. Users can claim their portion of tokens by providing a valid Merkle proof.

Features

• Airdrop Initialization: Owner can initialize a new airdrop by providing the Merkle root, number of users, and amount of tokens to be distributed.
• Token Revision: Owner can update the token contract address if needed.
• Claim: Users can claim their tokens by providing a valid Merkle proof.

Getting Started 🚀

1. Deploy the contract to the Ethereum blockchain.
   1. Ensure you have a .env file with the following variables:
      1. ARB_SEPOLIA_API_KEY=<Your_Arb_Sepolia_Alchemy_Node_API_Key>
      2. AIRDROP_CONTRACT_OWNER_PRIVATE_KEY=<Airdrop_Contract_Owner_Private_Key>
   2. Run shell npx hardhat deploy --network arbSepolia
2. Initialize a new airdrop using the init function.
3. Distribute the tokens to the contract address.
4. Users can claim their tokens using the claim function.

Usage

init(bytes32 _merkleRoot, uint256 _numberOfUsers, uint256 _amount)

Initialize a new airdrop with the Merkle root, number of users, and amount of tokens to be distributed.

revise(IERC20 _airdropToken)

Update the token contract address.

claim(bytes32[] memory _proof, uint256 airdropID)

Claim tokens by providing a valid Merkle proof.

Notes 🧠

• Ensure that enough tokens are deposited to the contract address before users claim their tokens.
• Users cannot claim tokens multiple times in same airdrop.
• Ensure the validity of Merkle proofs before processing claims.