Fraud-Detection-Chain

Fraud-Detection-Chain combines blockchain technology with machine learning for secure financial management and real-time fraud detection.

System Architecture

┌───────────────────────────────────────────────────────────────┐
│                     Frontend (React + Streamlit)               │
├───────────────────────────────────────────────────────────────┤
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────────────┐  │
│  │ Treasury    │  │ Payment     │  │ Budget              │  │
│  │ Dashboard   │  │ Requests    │  │ Management          │  │
│  └─────────────┘  └─────────────┘  └─────────────────────┘  │
├───────────────────────────────────────────────────────────────┤
│                    Smart Contract Layer (Solidity)            │
│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐       │
│  │ AccessControl│  │ TreasuryCore │  │ PaymentMgr   │       │
│  └──────────────┘  └──────────────┘  └──────────────┘       │
├───────────────────────────────────────────────────────────────┤
│                    ML Fraud Detection Pipeline                │
│  ┌──────────┐  ┌──────────┐  ┌──────────┐  ┌──────────┐    │
│  │ Feature  │→ │ LightGBM │→ │ Ensemble │→ │ Alert    │    │
│  │ Extract  │  │ Model    │  │ Voting   │  │ System   │    │
│  └──────────┘  └──────────┘  └──────────┘  └──────────┘    │
└───────────────────────────────────────────────────────────────┘

Blockchain Components

• Access Control: Role-based permissions (Admin, Approver, Requester)
• Payment Requests: Multi-signature approval workflow
• Budget Tracking: On-chain budget allocation and spending limits
• Audit Trail: Immutable transaction history

ML Fraud Detection

• Model: LightGBM with 91% F1 score
• Features: Transaction patterns, timing, amount anomalies
• Training Data: Kaggle fraud dataset, Enron emails, SEC AAER
• Real-time: Sub-second prediction latency

Detection Capabilities

• Unusual transaction amounts
• Timing pattern anomalies
• Account behavior changes
• Network-based fraud rings