In this video, I discuss the differences between proof of work and proof of stake as consensus mechanisms. I also recount the history of Ethereum moving to proof of stake, as well as a less well-known proof of stake version of Bitcoin called BitcoinPoS. Proof of work remains the fairest and most thermodynamically sound way to anchor money to the real world of physics and energy, while proof of stake just recreates the fiat system of rule by the rich.