Signing Safe Transactions with Customized EIP-1271 Contracts on Sepolia
As a developer, you’re likely familiar with the process of creating smart contracts on blockchain platforms like Ethereum. In this article, we’ll explore how to sign safe transactions using a customized EIP-1271 contract on the Sepolia network.
What is an EIP-1271 Contract?
Before diving into the specifics of signing safe transactions, let’s briefly introduce you to the concept of EIP-1271 contracts. The Ethereum Improvement Proposal (EIP) 1271 introduced a new way to create and deploy custom contracts on the Ethereum network. This proposal allows developers to define their own contract structures, including the use of multiple functions, storage, and more.
Creating a Customized EIP-1271 Contract
To create a customized EIP-1271 contract, you’ll need to follow these steps:
- Define your contract’s structure: Identify the specific requirements for your contract, such as the number of inputs, outputs, and function calls.
- Write your contract code: Use Solidity (Ethereum’s programming language) or another suitable language to write your contract. The EIP-1271 specification provides a detailed guide on how to create a valid contract.
- Compile your contract: Compile your contract using a tool like Truffle or Remix, which will generate the necessary artifacts and ABI.
Signing Safe Transactions
Once you have your customized EIP-1271 contract compiled and deployed, you can use it to sign secure transactions. To do this, follow these steps:
- Create a Safe transaction
: Use the
safeApiKit
library (as mentioned in your original article) to create a safe transaction that references your custom contract.
- Attach your contract’s ABI
: Attach the ABI of your customized EIP-1271 contract to the secure transaction using the
attachContract
method.
- Sign the transaction: Use the
signTransaction
method to sign the safe transaction with your private key.
Here is an example code snippet in Solidity:
pragma solidity ^0.8.0;
contract MyCustomizedEIP1271 {
// Define the contract's structure and variables
public uint myVar;
function customFunction() public pure returns (uint) {
return 1;
}
// Attach the ABI of the customized EIP-1271 contract
mapping(address => bytes32) public contractAbi;
function attachContractAddress() public {
contractAbi[msg.sender] = abi.encodeWithSignature("customFunction", value);
}
// Sign a safe transaction using the contracted address and private key
function signTransaction() public pure returns (bytes memory, string memory) {
bytes32 contractAddr = contractAbi[msg.sender];
return signTransaction(msg.sender, contractAddr, myVar);
}
}
Using the Safe API Kit
To use this example in your Safe API Kit, you’ll need to:
- Import the necessary libraries and modules.
- Define your customized EIP-1271 contract’s ABI using the
abi.encodeWithSignature
method.
- Attach the contract address and ABI to a secure transaction using the
attachContractAddress
function.
Here is an example code snippet in Safe API Kit:
const { apiKit } = require('@safe-api-kit');
const EIP1271Contract = await apiKit.createEip1271Contract();
const myVar = 0; // Define your variable value
// Attach the contract address and ABI to a safe transaction
const safeTransaction = await apiKit.signSafeTransaction(
EIP1271Contract.address,
'0x...contractAddress...', myVar
);
By following these steps, you should be able to sign safe transactions with your customized EIP-1271 contract on the Sepolia network using the Safe API Kit.