proof of work is inherently wasteful in a way that other systems are not. Exactly how wasteful they are is yet to be determined. This depends on how much valu

proof of work is inherently wasteful in a way that other systems are not. Exactly how wasteful they are is yet to be determined. This depends on how much value a successful attack on the blockchain could be to an attacker. The greater the value, the greater the cost of the proof-of-work system needed to prevent it.