Eliptic Curve Digital Signature

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.

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.

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

Educational Value:

This project was developed from scratch during a blockchain development bootcamp and then significantly enhanced. It simulates real-world Web3 behavior without requiring an actual blockchain.

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.