HealthcareGovernance Smart Contract (Simple Explanation) What It Does: This smart contract helps patients and doctors manage access to healthcare records securely. It stores only encrypted references (like IPFS links), not real medical data.

Roles:

• Admin: Registers patients and doctors.
• Patient: Adds their medical data and decides who can see it.
• Doctor: Requests access to patient data.

Data Records: Each patient has records with:

• dataHash: a unique ID or IPFS link
• description: short info like "Blood Test - Oct 2025"
• timestamp: when it was added

Adding Records: Patients can add records using addDataRecord(). The function checks that:

• The data hash and description are not empty.
• The sender is a registered patient.

Granting & Revoking Access: Patients can give or remove access for doctors using:

• grantAccess(address)
• revokeAccess(address)

Requesting Access: Doctors can request permission to view patient records using requestAccess(). There’s a 5-minute cooldown so they can’t spam requests. Viewing Records: A user can view data if they are the patient or have permission. The function viewDataRecords(patient, start, end) uses pagination, so it only shows a limited range of records to save gas.

Admin Setup: Admins can add new users:

• registerPatient(address)
• registerDoctor(address)

Security Features:

• Validates input fields (no empty strings or zero addresses)
• Uses role-based access control (Admin, Patient, Doctor)
• Prevents spam requests (cooldown timer)
• Future-ready for off-chain verification (e.g., checking IPFS data

addDataRecord | Patient | Adds encrypted data reference grantAccess | Patient | Allows doctor to view data revokeAccess | Patient | Removes doctor’s access requestAccess | Doctor | Requests permission viewDataRecords | Patient/Doctor| Views records if allowed registerPatient | Admin | Adds a patient registerDoctor | Admin | Adds a doctor