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Consensus is only provably secure if there is complete broadcast: every node broadcasting to every other node. That's impractical, but we should move closer to that ideal, each node communicating directly across as many internet bottlenecks as feasible to prevent eclipse attacks.https://twitter.com/udiWertheimer/status/1082918393940987906 …
He doesn't understand the computer science, and thus makes many misleading claims and suggests things aren't solvable when they are.
I think it is worse, he doesn't understand economics. If you look at the real skin in the game published costs of building a new large mining facility vs output it would cost >$100B to reach 50% of network hash rate in new facility costs and it would be very public.
Maybe a mining pool hack across multiple pools could achieve >50% and be possible but it would be noticed very quickly probably 1 block max.
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