This is a transcribed excerpt of the “Bitcoin Magazine Podcast,” hosted by P and Q. In this episode, they are joined by Paul Sztorc to break down why all roads lead to proof-of-work and how proof-of-stake protocols are fooling themselves by thinking that proof-of-stake technology can stay decentralized and secure.
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P: Start by defining at a high level what we mean when we say proof-of-work versus proof-of-stake. How would you define proof-of-work and how would you define proof-of-stake?
Paul Sztorc: It’s fine because it’s the point of my article. Proof-of-work is you do this one type of computation over and over again. So your computer is working very hard. There’s no other way to do it, it’s just based on quantity. How many times can you do this SHA256 hash? You’re doing it really fast, and every two weeks the bottom performers are fired. So basically, since you are just doing a computation a lot, it comes down to the electricity you spend, the money you spend on hardware, physical chips, the money you pump in to cool the chips, and it’s basically like you’re running your computer, you’re making your computer work really hard.
This doesn’t happen so much anymore, but in the olden days, you would be using your computer and it would just make little sounds, but then if you fired up a game — something that was intensive — the fan would go crazy and it would start to make more noise because the computer’s working really hard. So that’s the work; that poor computer is working really hard instead of doing nothing or only working when you ask it to. It’s going 100% trying to just churn out as much as possible.
In proof-of-stake, the idea is in the reality of the cryptosystem, in the reality of the blockchain or in the reality of the coin, in that reality of the full node software, it knows somehow — which is part of the problem, this somehow — but it knows who has which coins and it also knows who stakes which coins. These people put the coins into a sort of hazardous state, a hazardous box. They stake the coins. They say, “I buy in” with a certain amount, and then they join this — what would be — class of miners in their world.
They have a certain amount of coins staked and then there’s a complicated lottery system. There are many variants, but in general, it’s like the more money you stake, the more likely you are to be chosen. When you’re chosen, you have the ability to create the next block and then create the reward because you get a shot of that $10 billion.
Source: https://bitcoinmagazine.com/technical/nothings-cheaper-than-proof-of-work-consensus
