[Ukv]

> every miner would have to win every block to stay in business

To my understanding that'd be true if the energy cost was $2M per miner, but I think jpcfl was suggesting $2M total. i.e. that an individual miner would spend $100 on energy for a $100 expected return, which may be a 10% chance at $1000 or a 100% chance at $100.

Could adjust $2M up slightly for whatever portion was done by crypto-mining malware or dabblers with higher expected energy costs than return, and down for the portion done by professional miners who will be expecting a slightly positive return even after factoring in other costs.