Blockchain-Enabled Healthcare Digital Twins System

This repository contains a comprehensive implementation of a Blockchain-Enabled Digital Twins in Healthcare, some critical codes are collectively stored here.

Project Contents

1. IoT Firmware (healthcare-iot-firmware)

• Location: /healthcare-iot-firmware/
• Description: Arduino firmware for patient vital sign data acquisition
• Supported Sensors:
  • MAX30105 (Heart Rate & SpO2)
  • MAX30205 (Body Temperature)
  • AM2320 (Ambient Temperature & Humidity)
  • SSD1306 OLED Display

2. Azure Digital Twin - IoT Data Processing Service (iot-azure-hdt)

• Location: /iot-azure-hdt/
• Core Functions:
  • IoT device data ingestion
  • Data encryption and blockchain key storage
  • Azure Digital Twins (ADT) state management
  • Data validation utilities

3. Blockchain Smart Contract - Key Storage(blockchain-key-storage-contract)

• Location: /blockchain-key-storage-contract/
• Description: Ethereum-based smart contract for encrypted data key hash storage
• Tech Stack: Solidity, Hardhat, OpenZeppelin

4. Healthcare Digital Twin Dashboard (hdt-dashboard)

• Location: /hdt-dashboard/
• Features:
  • Real-time patient monitoring interface
  • Environmental parameter visualization
  • DeepSeek AI integration for health insights

5. Digital Twin Models (dtdl-models)

• Location: /dtdl-models/
• Content: Azure Digital Twins Definition Language (DTDL) models
• Model Types:
  • Patient model (ParentDT)
  • Room model (ParentDT)
  • Sensor models (ChildDTs)

Security Considerations

• Environment variables stored in .env files (gitignored always!)
• Secure storage requirements for encryption keys and blockchain transaction mappings
• Production deployment security hardening guidelines

Author

• Xinjian Zhang
• GitHub Profile

Acknowledgements

Special thanks to the guidance and support from my supervisor, Dr. Mubashar Iqbal.

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Note: This implementation serves as a prototype of Blckchain-Enabled Digital Twins in Healthcare for a Master's thesis project.