[zmgsabst]

Genuinely curious since I’d only heard of the “51% attack” — what happens around 20%?

[wslh]

Please check "Selfish Mining: A 25% Attack Against the Bitcoin Network" [1] and scientific studies such as [2].

[1] https://www.reddit.com/r/Bitcoin/comments/1pv8ty/selfish_min...

[2] https://arxiv.org/pdf/1507.06183