Re:Ethereum Proof-of-Stake
by camjohnson26 on Thursday July 07, 2022 @11:56AM
(#32015660)
That you’re getting downvoted speaks to the poor quality of discussion on this thread. To me this is the core issue with PoS. I don’t know enough about it to say if the Ethereum devs have solved it or not, but this is a much more interesting topic than misguided comparisons of PoS to crony capitalism, which is just uninformed.
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There's no solution that will give PoS the same objectivity PoW enjoys, but PoS (with slashing and exit delays) is secure against long forks under a weakly subjective model.
Vitalik has a pretty good post about it: https://blog.ethereum.org/2014/11/25/proof-stake-learned-lov...
Essentially, the solution is to ignore forks whose lengths exceed the exit delay, since such forks can be created without a slashing risk.
The main issue is that new nodes need to start with a (somewhat recent) trusted checkpoint. This does open up some attack surface that doesn't exist in PoW, though in my view it's not much of an issue. If I want to be extra careful, I can always ask several sources for a checkpoint and make sure they match.