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by EGreg 3148 days ago
You're right, you do mention proof of stake and dismiss it quickly. There is also delegated proof of stake, where validators can elect a leader without needing a proof of work arms race.

But you should really look at Ripple's consensus and study it:

https://ripple.com/build/xrp-ledger-consensus-process/

As well as HashGraph. Both of these do NOT require proof of work!

But in any case I think consensus is the wrong long term goal for technology powering currencies and other things. See my other comment in this thread regarding that (https://news.ycombinator.com/item?id=15646385)