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Suppose A has 0.2 hashing power. If A is waiting for only 1 confirmation. The chance of successful attack is 0.2^2 = 0.04 = 4%. So the victim has to pay 0.04*Block reward tx fees. This is the description of Feather Forking attack What if the attacker is waiting for 2 confirmations, how to compute the probability, is that like 0.8*0.2*0.2+0.2*0.8*0.2+0.2*0.2 or anything else. I am confused about it, thank you.

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