CleanChain Blockchain (Node.js)

CleanChain is a simple blockchain prototype built using Node.js that rewards users with tokens for performing social impact activities.

The project demonstrates how blockchain systems work internally including wallet generation, digital signatures, mining, and transaction validation.

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Features

• Blockchain with Proof-of-Work mining
• ECDSA digital signatures for transaction security
• Wallet generation system
• Signed activity transactions
• Token reward system (CLEAN-COINS)
• CLI interface for interacting with the blockchain
• Leaderboard for contributors

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Example Actions

Users earn CLEAN-COINS for performing social impact activities such as:

• Studying
• Helping others
• Community service
• Job preparation
• Volunteering

Example reward system:

Action	Reward
Study	5 CLEAN-COINS
Clean	10 CLEAN-COINS
Help	8 CLEAN-COINS
Job	6 CLEAN-COINS

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Project Structure

CleanChain_blockchain/
     │
     ├── blockchain.js # Blockchain logic
     ├── wallet_utils.js # Wallet + cryptographic signature s
     ├── cli.js # Command line interface
     ├── wallet.js # Wallet dashboard  
     ├── crypto_utils.js # Cryptographic helper functions
     ├── main.js # Blockchain runner
     ├── run_script.js # Test script
     ├── test_wallet.js # Wallet test
     ├── balances.json # Token balances
     ├── wallets.json # Stored wallet keys
     └── package.json

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Installation

Clone the repository: git clone https://github.com/YOUR_GITHUB_USERNAME/cleanchain-blockchain.git

Install dependencies npm install

Run the CLI node cli.js

CLI Menu

Create Wallet Add Social Impact Activity (Signed) View Blockchain Check Blockchain Validity View User Balances Exit

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Example Blockchain Output

Block #1 User: Adarsh Action: study Reward: 5 CLEAN-COINS

Block #2 User: john Action: help Reward: 8 CLEAN-COINS

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Tech Stack

Node.js
Crypto (ECDSA)
JSON Storage
CLI Interface

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Learning Outcome

This project helped explore core blockchain concepts:

• Proof of Work
• Digital Signatures
• Wallet Management
• Immutable Data Structures
• Token Reward Mechanism

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Author

Adarsh Mane
B.Tech Computer Science Engineering