With blockchain data can be stored in a decentralized public book.
With cryptocurrency, we can make anonymous transactions without centralized intervention.
If you add speed and spread to the public, then the future is cryptocurrency.
How do you think?
There is a thing called privacy coins that is exactly what best describe this. They are not govern by most centralized platform except for market trades but their concept is much similar to what you are asking. Their platform works like a privacy book encompasses of most data movement. Such example of this is monero which is highly commendable coin on cryptocurrency. There are some who followed this path but not sure of their potential.