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Beautiful scenery!
Lovely!

I agree, proof of work attacks the problem from a very narrow angle, our only evidence so far is that it seemingly works in the very primitive computing scenarios we are currently placing the new technologies in.

In many ways I look at ledgering as our new technology being able to provide the simple ledgering calculation mechanisms the first computers did, when we supersede the implementation techniques that we currently rely on we'll raise the bar on what the technology is capable of.