This contract, passGas
, leverages the concept of meta-transactions, allowing users to send transactions without incurring gas fees. Instead, another entity (e.g., the contract owner) pays for the gas. The system works by having the user sign a message off-chain. The signed message is then sent to the contract, where it gets verified. If the verification is successful, the desired transaction is processed.
- Meta-transactions: Users don't need to hold or spend ETH for gas fees.
- Nonces: Ensures a particular signature can only be used once, preventing replay attacks.
- Self Destruct: A mechanism for the contract owner to destroy the contract and recover any remaining funds.
passGas.sol
: The smart contract enabling meta-transactions.
claimPayment(uint256 amount, uint256 nonce, bytes memory sig)
: Claim ether based on a valid off-chain signature.kill()
: Allows the contract owner to safely destroy the contract.
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To claim a payment:
function claimPayment(uint256 amount, uint256 nonce, bytes memory sig) public
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To terminate the contract (owner only):
function kill() public
- Compile and deploy the contract using tools like Remix or Truffle.
- Ensure that the contract has enough funds (ETH) if you're planning to let users claim payments.
- Set up a system where users can sign messages off-chain and send the signatures to the contract to claim their payments.
- Keep the off-chain signing mechanism secure.
- Use a fresh nonce for every transaction to prevent replay attacks.
- Only the owner can destroy the contract, so be cautious with this power.
MIT