# Medicalchain - Blockchain-based Patient Records

> Medicalchain utilizes blockchain technology to create a decentralized platform for electronic patient records. The platform enables patients to securely store and manage their health data while controlling access for various healthcare providers. The system aims to improve interoperability between different healthcare actors and break down data silos.

**Sector:** Tertiary sector · **Industry:** Care and social services · **Organisation:** Medicalchain · **Maturity level:** Concept

Canonical URL: https://www.sapientblock.com/en/use-cases/medicalchain-patientenakte-selbst-kontrollieren

## Documentation status

- **Project status:** Concept
- **Evidence:** Evidence medium
- **Editorial review:** Ufuk Avci, 15 April 2026

## Description

The concept of the patient-controlled health record (PCHR) addresses the data sovereignty issue in healthcare: today, clinics store patient data in proprietary systems; patients have no central access and no control over data sharing.

A systematic review in Frontiers in Blockchain (2026) examined the entire state of blockchain-based healthcare applications. Result: PCHR systems are among the most advanced and practical applications. The concept: the patient creates a self-controlled digital health record on the blockchain; clinics, labs, and pharmacies write findings into this record (with patient consent); the patient decides via smart contract who may access which data. Every access is immutably logged. Advantages over central EHR systems: (1) No single point of failure; (2) No data loss when practices close; (3) Complete patient history without redundancy issues; (4) Immediate access for emergency doctors with patient consent. EU regulation: GDPR Art. 20 requires data portability in healthcare — blockchain-based PCHR is a natural technical implementation.

## Benefits

- Healthcare facilities can reduce administrative costs for data exchange and management.
- Patients can manage their health data responsibly and use it for better medical care.
- Blockchain technology ensures immutable and secure storage of health data with decentralised access control.
- Patients gain full autonomy over their medical information and can grant targeted access.
- Interoperability between different healthcare providers is significantly improved.
- Medical staff gain faster access to complete patient histories, accelerating diagnosis and treatment processes.

## Challenges

- Healthcare facilities must invest in new IT infrastructure and convert existing systems.
- Patients need to develop digital skills to manage their health data independently.
- Integration into existing hospital information systems is technically complex and requires significant investment.
- Acceptance of the new technology among all healthcare stakeholders must first be established.
- Medical staff require training in handling blockchain-based systems and must adapt established workflows.

## Technology foundation

The solution is based on a blockchain architecture that combines both public and consortium elements. Blockchain is particularly suitable here because it enables immutable data records while providing decentralised access control for sensitive patient data.

## Sources

- [Blockchain Applications in Healthcare: A Systematic Review](https://www.frontiersin.org/journals/blockchain/articles/10.3389/fbloc.2026.1766092/full)