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A comment on We can confirm that there was a successful 51% attack on Ethereum Classic. Parent comment

Re:We can confirm that there was a successful 51% attack on ... by Semaphor on Tuesday January 08, 2019 @12:20AM (#18853396)
But isn't the point of the whole thing that you do not broadcast it until after you are done? So yes, it's obvious in hindsight, but the damage will be done.
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Re:We can confirm that there was a successful 51% attack on ... by CydeWeys on Tuesday January 08, 2019 @05:51PM (#18860573)
The question was how do you detect it. You obviously can't detect it until it's broadcasted because until then it's all happening in secret.
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