Blockchain technology is going to change everything: the shipping industry, the financial system, government … in fact, what won’t it change? But enthusiasm for it mainly stems from a lack of knowledge and understanding. The blockchain is a solution in search of a problem.
I would have argued it solved a distributed data problem, but DHTs solved that and much like DHTs, the Blockchain is painfully slow.
DHT and blockchain solve different problems. Blockchain are usefully when you need to come to consensus on the ordering for events.
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You could, scuttlebutt builds a social network without domains and optionally uses a DHT