I close my eyes, hoping the brain won’t play tricks and send me into panic mode. The metallic, rhythmic noises of the MRI overpower the classical music in my headphones. I am one of the participants in the Swiss Heart Study, and this is my first time having a heart MRI. I know my data will be used to understand better and prevent cardiovascular disease. A week later, I received a huge data collection, from MRI images to blood tests, DXA scans, and even fitness test results. Not great, so I need to climb off the couch and enjoy the great outdoors more. And I wonder: how do I make sense of that? Can I correlate it with all the data from my wearables? What about the previous medical records? How can I utilise my data to enhance my health and share it with someone who uses it for a cause I believe in, such as the Swiss Heart Study? I would love to have all my health data in one place. Not because I am a control freak, but because I am tired to act as a detective. I wear a smart ring that tracks my sleep. A smartwatch that monitors my heart rate. I have apps for meditation, nutrition, fitness, and even one for stress management. Then there are my medical files – scattered across countries, stored in dusty folders or locked away in inaccessible hospital systems. Blood tests in one place. Vaccinations in another. I cannot even retrieve MRI scans without calling someone. If this is my body, why is my data everyone else’s business? The Problem: Fragmentation and Power Asymmetry Today’s healthcare system is a beautiful mess. Innovative? Yes. Personalised? Maybe. Integrated? Not even close. Every new wearable promises insight. Every new clinic runs its own diagnostics. Healthcare experts estimate that 95% of the hospital data is unused. But the result is a puzzle with missing pieces, and the patient is often the last to see the full picture. Meanwhile, tech companies, providers, and platforms do see your data, just not in a way that helps you. They monetise, analyse, and lock your data behind terms of service that nobody reads. Your digital self is sliced and sold while you struggle to download your lab results. This is inconvenient and dangerous. Critical insights get lost. Many rare or genetic disorders could benefit from the data, and more people could get appropriate treatment. Duplicated tests waste money. And patients lose agency over something deeply personal: their health story. The Vision: One Patient, One Record, Total Control Imagine opening a secure app and seeing everything: Now imagine this is not owned by Apple, Google, or your local hospital, but by you. Not stored in 15 places, but under your digital key. Not shared by default, but only when you choose, for a doctor, a second opinion, or even a clinical trial you believe in. What do you get instead? You can get valuable personalised health insights, access to additional health coaching and telemedicine, or health tokens you can use in the healthcare system. The Turning Point: Blockchain and Decentralised Health Data Ownership The Etheros HealthData Foundation, in collaboration with the Crypto Valley Association, has recently outlined a bold yet feasible vision for the ownership of health data. Their proposal? Use blockchain to restore control to individuals while preserving trust, privacy, and interoperability. The approach is simple. I am the owner of the data. I can share it securely with the institutions and causes I believe in and be incentivised to do so. Sharing my health data is a sensitive topic, but with zero-knowledge proof protocols, I can anonymise the data before sharing it. When I hear of blockchain, I think of transparency, but what about my privacy? Well, there is a solution for that too: Digital Identities (DID) can be leveraged to protect my identity. Moreover, blockchain allows me to use personal health vaults, encrypted and secure spaces where I can keep my data and smart consent – I grant and revoke access instantly, and I always have full control over who sees my data, when and why. It is a model where ethics meet tech, and where patients finally become partners, not passive subjects. The change: what do we need to own our health data Interoperability If we want patients to truly own their health data, we cannot ignore the plumbing behind the scenes. One of the most important pieces of that infrastructure is something called Fast Healthcare Interoperability Resources (FHIR). It might sound like yet another complicated acronym, but it is actually one of the most promising enablers of change in healthcare. Fast Healthcare Interoperability Resources (FHIR) is a technical standard that defines how health data can be formatted, exchanged, and accessed across different systems. In simple terms, it tells hospitals, labs, pharmacies, insurers, and even health apps how to speak the same digital language. This is a big deal, considering that most healthcare systems today still operate in silos, with data locked in proprietary formats that are hard to access—especially by the patient. Legal Clarity If patients are to own their health data, we need clear rules about what that actually means. Who holds the data? Who can access it—and under what conditions? Too often, laws are vague or inconsistent across countries, leaving both patients and providers in limbo. True data ownership needs a legal backbone—one that defines rights, responsibilities, and recourse when those rights are violated. Patients need clear, enforceable rights over their health data: the right to access it, to share it, and to decide who uses it. The Ethereos Health Data Foundation is working to define these rights in practical terms, using smart contracts and decentralized governance to turn legal intentions into verifiable actions. Trust Through Transparency Technology alone does not build trust—transparency does. Patients must know what data is being collected, how it is stored, and who is using it. Blockchain can verify data integrity without exposing personal information. Patients will not trust a system they cannot see into. Blockchain provides a transparent, tamper-proof record of every data access and transaction. With