safety – Is the ‘actual barrier’ to assault bitcoin’s consensus 33.34%, slightly than 51%?

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Noticed a random tweet thread that claimed that the “51” in “51% assault” was misinformation, and that in actuality solely 33.34% of hash energy could be wanted for a foul actor to assault the community.

I used to be skeptical, however one of many posters linked to a speak by Dr. Leeman Baird the place, so far as I can interpret, he explains that for those who put a firewall round 1/third of the hash energy and refuse to permit it to speak to the opposite 2/3rds, then you definately solely want barely greater than half of this remaining 66% (33.34%) to maliciously assault the community. (The related a part of the video begins at 1:01:08 or so).

I form of get it as an idea, however as one of many college students asks, it appears prohibitively troublesome for a foul actor to cordon off 1/third of the world’s hash energy with a firewall. As they ask, is constructing a firewall round 1/third of hash energy considerably simpler than acquiring the remaining 18% of the hashpower they’d’ve wanted (18+33=51%) to conduct an ordinary 51% assault? This looks as if an awesome query, however Dr. Baird casually responds that China already has a firewall round all of their web, so doing so is fairly easy because it already exists.

Would not the hash energy simply transfer? He explains that recognizing that it has been cordoned off could be troublesome and thus makes this answer infeasible.

Is that this legit? Would love for somebody to provide perception.

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