Custom ERC-20 Wallet for Ethereum Blockchain

Overview

A secure, self-custody cryptocurrency wallet designed specifically for ERC-20 token interactions on the Ethereum blockchain. This solution eliminates dependency on third-party wallets like MetaMask, offering full control over token management—sending, receiving, and withdrawals—via a lightweight implementation built with ethers.js. Currently optimized for the Sepolia testnet.

Key Features

• Self-Managed Accounts: Create new wallets or import existing ones via private keys.
• ERC-20 Token Operations: Transfer tokens, check balances, and audit transactions.
• Sepolia Testnet Integration: Test functionalities risk-free before mainnet deployment.
• Security-First Design: Encrypted private key storage with industry-best practices.
• CLI Interface: Simple console-based UI for developers.

Prerequisites

Ensure your system has:

• Node.js v14+ and npm
• An Infura account (for Ethereum network access)
• Deployed ERC-20 contract on Sepolia testnet

Installation

1. Clone the Repository

git clone https://github.com/yourusername/custom-erc20-wallet.git  
cd custom-erc20-wallet  

2. Install Dependencies

npm install  

3. Configure Environment

Create a .env file with:

INFURA_API_KEY=your_infura_project_id  
SEPOLIA_TOKEN_ADDRESS=your_token_contract_address  
SEPOLIA_PRIVATE_KEY=your_wallet_private_key  # ⚠️ Never commit this!  

Usage Examples

Generate a New Wallet

const newWallet = ethers.Wallet.createRandom();  
console.log("Address:", newWallet.address);  

Check ETH Balance

const balance = await sepoliaProvider.getBalance(wallet.address);  
console.log("Balance:", ethers.utils.formatEther(balance));  

Transfer ERC-20 Tokens

const tx = await tokenContract.transfer(recipientAddress, amount);  
console.log("Tx Hash:", tx.hash);  

Security Best Practices

• 🔒 Never expose private keys in client-side code.
• 🛡️ Use environment variables for sensitive data.
• 🧑‍💻 Audit dependencies regularly.

FAQ

Q: Can I use this wallet for mainnet transactions?

A: Yes, after thorough testing on Sepolia. Update the Infura endpoint to mainnet in the configuration.

Q: How do I recover a lost wallet?

A: Without the private key or seed phrase, recovery is impossible—this emphasizes self-custody security.

Q: Is MetaMask integration possible?

A: The wallet operates independently, but you can manually connect to dApps via injected providers.

👉 Explore advanced wallet setups

Contributing & License

• Contributions: Fork → Feature Branch → Pull Request.
• License: MIT (see LICENSE file).

### Keywords Integrated:  
1. ERC-20 Wallet  
2. Ethereum Blockchain  
3. Sepolia Testnet  
4. ethers.js  
5. Self-Custody Crypto  
6. Token Management  
7. Secure Transactions  

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