🔐 ECDSA-Wallet

A simulated Web3 wallet app that uses ECDSA cryptographic signatures for secure transactions between addresses. Built for educational and portfolio purposes using React, TailwindCSS, and a custom backend powered by Express and LowDB.

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🧠 Summary

ECDSA-Wallet allows users to generate wallets (public/private key pairs), view balances, and send signed transactions to other wallets using elliptic curve cryptography. All data is persisted on the backend using a simple JSON-based database (LowDB), simulating real-world blockchain mechanics without needing an actual blockchain.

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🚀 Live Demo

🔗 The app is deployed on:

• Frontend (Vercel): https://ecdsa-wallet.vercel.app
• Backend (Render): https://ecdsa-wallet-backend.onrender.com

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🔐 Features:

• 🔑 Generate public/private key pairs using ECDSA (secp256k1)
• 💾 Persist wallets in browser's localStorage
• 📥 Check balance of any address
• 🔒 Sign and verify transactions using private key (never exposed)
• ⚖️ Prevent transfers to self or with invalid signatures
• 📜 View transaction history (stored via LowDB)
• 🧹 Delete wallets and update UI in real-time
• 🎨 Stylish interface built with Tailwind CSS

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🚀 Tech Stack:

Frontend	Backend	Crypto & DB
React	Express.js	ethereum-cryptography
Tailwind CSS	LowDB	secp256k1 (ECDSA)
Axios	Node.js	JSON persistence

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📦 Installation:

# 1. Clone the repo
git clone https://github.com/Hayk-1315/ECDSA_Wallet.git
cd ecdsa-wallet

# 2. Install backend dependencies
cd server
npm install

# 3. Install frontend dependencies
cd ../client
npm install

# 4. Start backend server
cd ../server
npm start

# 5. Start frontend (in another terminal)
cd ../client
npm run dev

🎓 Educational Value:

What you’ll learn:

🔐 Asymmetric cryptography using ECDSA

📩 Message signing & verification

🧭 Secure transaction flow with hash validation

💡 Designing a full-stack dApp architecture

🛠 Persisting data using LowDB as a lightweight backend

Perfect for newcomers who want to understand Web3 without diving straight into Solidity or deploying smart contracts.


🔮 Future Improvements:
🔐 Encrypt private keys in localStorage (AES)

🦊 MetaMask integration with ethers.js

📦 Migrate from LowDB to MongoDB or PostgreSQL

🧪 Add full unit & integration tests


🧑‍💻 Author:
Made with ❤️ by Albert Khudaverdyan

Feel free to reach out or contribute!


📄 License:
This project is licensed under the MIT License.
You are free to fork, modify, and share for educational or personal use.