Session 3.5 - Healthcare Use Case

Learning Objectives

Develop healthcare-specific smart contracts
Understand healthcare industry requirements
Address privacy and compliance challenges
Design secure patient data management systems

Healthcare Blockchain Applications

Healthcare Challenges

Healthcare systems face unique challenges including data privacy, interoperability, patient consent, and regulatory compliance.

Medical Records

Patient data ownership
Secure sharing between providers
Audit trails for access
Consent management

Drug Supply Chain

Counterfeit prevention
Origin verification
Temperature monitoring
Recall management

Clinical Trials

Data integrity
Patient consent tracking
Result transparency
Regulatory compliance

Patient Consent Smart Contract

Consent Management System

contract PatientConsent {
    struct ConsentRecord {
        address patient;
        address provider;
        string dataType;
        uint256 expiryDate;
        bool isActive;
    }
    
    mapping(bytes32 => ConsentRecord) public consents;
    mapping(address => bytes32[]) public patientConsents;
    
    event ConsentGranted(bytes32 consentId, address patient, address provider);
    event ConsentRevoked(bytes32 consentId);
    
    function grantConsent(
        address _provider,
        string memory _dataType,
        uint256 _duration
    ) public returns (bytes32) {
        bytes32 consentId = keccak256(abi.encodePacked(
            msg.sender, _provider, _dataType, block.timestamp
        ));
        
        consents[consentId] = ConsentRecord({
            patient: msg.sender,
            provider: _provider,
            dataType: _dataType,
            expiryDate: block.timestamp + _duration,
            isActive: true
        });
        
        patientConsents[msg.sender].push(consentId);
        emit ConsentGranted(consentId, msg.sender, _provider);
        return consentId;
    }
    
    function revokeConsent(bytes32 _consentId) public {
        require(consents[_consentId].patient == msg.sender, "Not authorized");
        consents[_consentId].isActive = false;
        emit ConsentRevoked(_consentId);
    }
    
    function checkConsent(bytes32 _consentId) public view returns (bool) {
        ConsentRecord memory consent = consents[_consentId];
        return consent.isActive && 
               block.timestamp <= consent.expiryDate;
    }
}

Privacy and Compliance

Regulatory Requirements

HIPAA: Patient data protection
GDPR: Right to be forgotten
FDA: Drug approval processes
State Laws: Medical practice regulations

Privacy Solutions

Off-chain Storage: Sensitive data external
Encryption: Data protection at rest
Zero-Knowledge: Proof without disclosure
Access Controls: Role-based permissions

Potential Blockchain Workflows

Healthcare Industry

Data Security & Access Control: Blockchain ensures secure, auditable access to patient data.
Integrity & Trust: Immutable records build trust among patients and providers.

Patient Identity & Records:
- Decentralized IDs (DID) for patient identity.
- Encrypted medical records stored off-chain; hashes on blockchain.
Data Access & Sharing:
- Patients grant/revoke access via smart contracts.
- Hospitals, labs, insurers, researchers access verified data.
Clinical Trials & Research:
- Trial data hashed and timestamped for integrity.
- Prevents tampering, enhances trust in results.
Drug Supply Chain:
- Track pharmaceuticals from manufacturer to patient.
- Prevents counterfeit drugs.
Insurance & Claims:
- Smart contracts automate claims validation and payout.
- Fraud prevention with immutable records.

Summary

Key Takeaways

Healthcare applications require strict privacy and compliance measures
Smart contracts can automate consent management and data sharing
Drug supply chain tracking prevents counterfeiting
Clinical trial transparency improves research integrity
Hybrid architectures balance transparency with privacy needs

What's Next?

Next, we'll explore a Property Transfer Case study.

Next: Property Transfer Case Previous: DLT-based Contracts Back to Course Home