Well, I can start by talking about the human genome which is about 3Gb of data and which I think can actually be halved considering there are no wobbles. This info is gold in the next couple of years. And you're entirely right - medical information is highly sensitive - to have a blockchain encrypting this data would be invaluable and ethically sound as technology moves on.
From what I know,
Distributed ledger technology is considered a foundation of the blockchain (although there have been many upgrades and alterations) which contains different nodes to maintain the network. Currently, people estimate that there are around
15000 nodes, each full node is around
390GB. Therefore, in order to maintain a medical-based blockchain that contains genomes of 1 million customers, each node has to be a size of an enormous database. This is capable in the far future because technology advances every year.
However, I still do not think it is a good idea. And, not, as far as I know, nothing is unhackable. We have seen many blockchains being hacked and lost millions of dollars. Shifting from the current defense system to the blockchain requires the cybersecurity team to extend their knowledge to protect not only one but more than 2 database systems. It is extremely hard to maintain
Confidentiality, Integrity, and Availability for such data. And no matter how hard you try to harden the system, human is still the main factor that causes everything. Ronin's network was hacked and from what I know it is because an employee was exploited so sensitive information has been stolen. And you need to know that they have
9 nodes Therefore, a single centralized database is still a better option because right now, there have been many advanced defensive mechanisms with experienced engineers. You can create a many-layer system, use a virtual machine, fracture your data, etc...
My friend told me that AI will have the biggest impact on the medical system in the future. Why? There is actually not much data for them to research, and analyze to form a model and AI has the power to create new and fresh samples for more information so that scientists/doctors can draw a more precise conclusion. Just like deep fake technology that can create a non-existing person.