Healthcare records on NOSTR

This spec aims to build a client application that enables patients to securely store and access their medical data using the Nostr protocol while ensuring only authorized doctors can write medical records. All data is end-to-end encrypted (E2EE) before being stored on Nostr relays, preventing unauthorized access. Patients can grant or revoke doctors’ write permissions, and all medical updates are encrypted with the patient’s public key, ensuring only they can read them. An audit log keeps track of all doctors (identified by their npubs) who have accessed or modified the patient’s data. This solution provides privacy, security, and transparency while leveraging decentralized, zero-trust storage on Nostr. 🚀

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1️⃣ Core Architecture#

Client Application (Mobile - Patient)#

• Stores only encrypted medical data (no write permissions).
• Allows temporary read access to the patient.
• Maintains an audit log of npubs (medical staff) who wrote/modified data.

Client Application (Mobile - Doctor)#

• Writes new medical records and encrypts them with the patient’s npub.
• Submits encrypted records to Nostr relays.
• Can view past records that they (or other authorized doctors) have written.

Nostr Relays#

• Store only encrypted medical records (relays cannot read them).
• Act as a communication layer between doctors and the patient.

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2️⃣ How It Works (End-to-End Workflow)#

👨‍⚕️ Writing/Updating Medical Data (Doctor)#

1. The doctor inputs new medical records into their mobile app.
2. The data is encrypted using the patient’s npub (so only the patient can read it).
3. The encrypted record is published to Nostr relays.
4. The patient’s app detects the update and decrypts the data locally for viewing.

👩‍⚕️ Managing Doctor Access (Patient)#

1. The patient manually grants or revokes access to doctors via their app.
2. If a doctor is granted access, they can write new records.
3. The patient cannot modify or delete medical records, only read them.

🔑 Secure Key Exchange for Read Access#

1. The doctor encrypts records with the patient’s npub.
2. The patient uses their nsec (private key) to decrypt and read the data.
3. Other unauthorized parties (including relays) cannot decrypt the data.

📜 Access Logging#

• Every write operation (new or modified medical record) is logged in the patient’s app.
• The log includes:
  • npub of the doctor who made the update.
  • Timestamp of the update.
  • Hash of the encrypted record for verification.

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3️⃣ Security Measures#

✅ Doctors Can Write, Patients Can Only Read

• Only authorized doctors can submit medical data.
• Patients can only view (not modify) their records.

✅ End-to-End Encryption

• Data is encrypted before transmission, ensuring no unauthorized access.

✅ Zero-Trust Storage

• Nostr relays store encrypted records that are useless without the decryption key.

✅ Audit Log for Transparency

• Patients can track who wrote or modified their records.

✅ No Long-Term Access Without Authorization

• The patient can revoke a doctor’s write permissions anytime.

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4️⃣ Technology Stack#

• Frontend (Mobile App)

  • Flutter (Dart) or React Native (JavaScript/TypeScript)
  • Secure local storage for audit logs (EncryptedSharedPreferences on Android, Keychain on iOS)

• Cryptography

  • ECC (Elliptic Curve Cryptography) for key exchange (Nostr encryption model)
  • AES-256 for encrypting medical records (written by doctors)

• Networking & Storage

  • Nostr Protocol (NIPs 04 for encrypted DMs, NIP 33 for event-based access control)
  • Multi-Relay Storage (for redundancy)

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5️⃣ Potential Challenges & Solutions#

🔹 Patient Cannot Edit Records#

• Patients might want to annotate or request corrections on their records.
• Solution: Allow a separate encrypted channel for patient feedback.

🔹 Doctor Write Permissions Management#

• A UI is needed for patients to approve/revoke doctor access easily.
• Solution: Implement a simple approval system in the mobile app.

🔹 Relay Availability#

• Solution: Store records on multiple relays for redundancy.

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This design ensures that only authorized doctors can write data, while patients have full visibility and control over access. 🚀

I'm looking for a co-founder to build this. I've got the experienced and cost-efficient team who can build this. DM me for details.