Imagine a network on healthcare institutes where they don’t own a patient’s personal data. The data all belong in the blockchain. The patients are identified via their hash ID which will be their unique identifier. The hashing allows the ID to be unique and secure, protecting also the privacy of the user.
The blockchain can also aid in the creation of a patient information sharing marketplace. This way, it will be possible to actually incentivize information sharing between the different institutes to prevent any kind of info blocking.
However, what if we still have some malicious actors who attempt to do information blocking or tampering?
In that case two of the blockchain’s most significant features will step up and handle this situation:
Firstly, the blockchain is a transparent medium. Anyone, who is part of the network, can look into the blockchain and look at how each transaction takes place and whether all the relevant information is getting passed through or not.
Secondly, we have anti-tampering.
If anyone tries to block the data then via the snowball effect, it will change the hash drastically. Now, remember, that the blocks in the blockchain are linked to one another via a hash pointer. Each block in the blockchain stores the hash of the data that is stored in the previous block. If the data inside any one of the blocks change, it sets up a chain reaction which could freeze up the whole blockchain. Since this is a theoretical impossibility, it is impossible to tamper with any data that is inside the blockchain.
(original text can be found on: https://blockgeeks.com/guides/blockchain-in-healthcare/)
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