ReverseOTP – Power Shift in Welfare Distribution System

Designed for rural India with intermittent connectivity and scalable fraud monitoring.

Problem Statement:

Public Distribution System (PDS) in rural areas faces:

• Duplicate ration distribution
• Black marketing by shopkeepers
• Fake complaints by customers
• No transparency in offline environments
• Weak fraud detection mechanisms

Our system ensures secure token-based ration distribution with offline verification and fraud detection.

Solution Overview:

We built a secure ration distribution system that:

• Uses TOTP-based secure UTID tokens (valid for 15 minutes)
• Allows offline verification using SQLite
• Syncs transactions to MongoDB when internet is available
• Detects duplicate distribution per month
• Allows customers to file complaints
• Performs fraud detection on both shopkeepers and customers
• Provides admin analytics dashboard APIs

Architecture:

👤 Customer (USSD Simulator)

• Enters ration card number
• Receives secure 15-minute UTID token

🏪 Shopkeeper App (Offline SQLite)

• Verifies UTID offline using secret key
• Dispenses ration
• Stores transaction locally
• Syncs when internet is available

☁ Backend (Node.js + MongoDB)

• Validates users
• Stores transactions
• Handles sync
• Stores complaints
• Runs fraud detection
• Provides admin analytics

👤 Government DashBoard

Accessible by government officials.

Provides:

• Shop-wise fraud risk status (RED / GREEN)
• Complaint ratio per shop
• Total black-market Kg detected
• Customer fraud detection
• Suspicious activity alerts
• Monthly distribution analytics

Government can:

• Identify high-risk shops
• Detect black marketing patterns
• Track repeated fake complainers
• Trigger inspections/raids

🛠 Tech Stack

📱 Frontend

• React Native – Shopkeeper mobile application
• React Native (USSD Simulator) – Simulates SMS/USSD logic
• React.js – Government Monitoring Dashboard

💾 Local Storage (Offline-First Architecture)

• SQLite – Stores beneficiary data and transactions locally in the shopkeeper app
• SHA-256 – Ensures tamper-proof transaction records (Blockchain-like simulation)

⚙ Backend

• Node.js – Runtime environment
• Express.js – REST API framework
• MongoDB Atlas – Cloud database for centralized storage
• Mongoose – MongoDB object modeling and schema management

📊 Impact

• Prevents duplicate ration allocation
• Detects black marketing
• Identifies fake complaints
• Works in low-internet rural areas
• Secure token-based distribution

👥 Team Roles:

• Risa: Backend architecture, Sync logic (Offline to online databse), APIs, TOTP logic, Databases
• Ketan: USSD Simulator
• Blossom: Storing data offline using sqlite, triggering sync api when internet is available, frontend for the shopkeepers app
• Manish: Dasboard for the government officials