I've previously [1] posited an impossibility theorem, namely that a Proof of Work blockchain can't: * be secure * be energy efficient, environment-friendly, a

I've previously [1] posited an impossibility theorem, namely that a Proof of Work blockchain can't: * be secure * be energy efficient, environment-friendly, and * have high value on the chain, "high stakes" - pick any two. This paper seems to argue a version of that rigorously. [1] https://news.ycombinator.com/item?id=31132999 https://news.ycombinator.com/item?id=31132999