> > In the healthcare related blockchain ideas or prototype implementations I > have heard about so far something different than proof of work is used, for > example proof of authority. That has other drawbacks and challenges, but it > does not suffer from the same power consumption problems. >
that's true. But I don't see s sweet spot there; either you end up falling back to a central authority after all - in which case you might as well just trust the central authority and design a more efficient solution, or you have something that's less secure - but doesn't - as far as I can figure out - have less of a reason to need security. The one possible exception I've seen, which I've seen in production, is closed trading schemes around tracking payments between a group of entities. Grahame
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