Posted By : Mohd
The ERC-4337 standard introduces a new account abstraction layer for Ethereum, enabling a more flexible and user-friendly approach to account management, especially for smart contract wallets. It allows transactions to be sent by smart contracts on behalf of users, opening up possibilities for paying transaction fees in tokens other than ETH, setting transaction parameters, and more complex account recovery mechanisms. For more information, visit Smart Contract Development Services.
Node.js and npm: Ensure that you have Node.js and npm installed on your machine.
Hardhat: Development framework for Ethereum, allowing for smart contract compilation, testing, and deployment.
Code Editor: Choose a code editor of your preference to code the smart contract. Example - VS Code.
Below is a simplified example of a smart contract that follows the ERC-4337 standard. This contract acts as a basic smart wallet that can hold funds and execute transactions on behalf of its owner.
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interface IERC20 {
//Transfer function
function transfer(address to, uint amt) external returns (bool);
//Approve function
function approve(address spender, uint amt) external returns (bool);
//Transfer from function
function transferFrom(address from, address to, uint amt) external returns (bool);
//Balance function
function balanceOf(address _account) external view returns (uint);
}
Functions are provided to deposit ETH into the wallet (deposit) and withdraw ERC20 tokens (withdrawToken). The contract can also receive ETH directly thanks to the receive function.
// Deposit funds into the wallet
function deposit() external payable {}
// Withdraw ERC20 tokens from the wallet
function withdrawERC20Token(IERC20 token, address to, uint256 amount) external onlyOwner {
require(token.transfer(to, amount), "Token transfer failed");
}
// Allow wallet to receive ETH
receive() external payable {}
The executeTransaction function allows the owner to execute arbitrary transactions, sending ETH and data to other contracts or addresses
// Execute a transaction from the wallet
function executeTransaction(address payable to, uint256 value, bytes calldata data) external onlyOwner {
(bool success, ) = to.call{value: value}(data);
require(success, "Transaction failed");
}
The onlyOwner modifier ensures that only the wallet owner can execute certain functions, adding a layer of security.
modifier onlyOwner() {
require(msg.sender == owner, "Not the owner");
_;
}
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This example is a basic illustration and can be extended with more features like multi-signature control, transaction limits, and recovery options to create a more robust and user-friendly smart wallet that leverages the ERC-4337 standard. You can find the whole code for the example below:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IERC20 {
//Transfer function
function transfer(address to, uint amt) external returns (bool);
//Approve function
function approve(address spender, uint amt) external returns (bool);
//Transfer from function
function transferFrom(address from, address to, uint amt) external returns (bool);
//Balance function
function balanceOf(address _account) external view returns (uint);
}
contract BasicSmartWallet {
address public owner;
modifier onlyOwner() {
require(msg.sender == owner, "Not the owner");
_;
}
constructor(address _owner) {
owner = _owner;
}
// Deposit funds into the wallet
function deposit() external payable {}
// Execute a transaction from the wallet
function executeTransaction(address payable to, uint256 value, bytes calldata data) external onlyOwner {
(bool success, ) = to.call{value: value}(data);
require(success, "Transaction failed");
}
// Allow wallet to receive ETH
receive() external payable {}
// Withdraw ERC20 tokens from the wallet
function withdrawERC20Token(IERC20 token, address to, uint256 amount) external onlyOwner {
require(token.transfer(to, amount), "Token transfer failed");
}
// Approve an allowance for an ERC20 token
function approveToken(IERC20 token, address spender, uint256 amount) external onlyOwner {
require(token.approve(spender, amount), "Token approve failed");
}
}
If you are interested in developing similar or more complex blockchain-based solutions, like crypto wallets, smart contracts, or DeFi solutions, connect with our skilled smart contract developers to get started.
September 8, 2024 at 02:39 am
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