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A comment on Cost of a 51% attack for different cryptocurrencies?. Parent comment

Re:Cost of a 51% attack for different cryptocurrencies? by pat2man on Monday January 27, 2020 @11:33AM (#22160863)
As far as the block chain is concerned they cannot. No single branch can have a double spend. But of course with deep reorgs they can defraud exchanges or other parties who end up on the wrong branch.
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Re:Cost of a 51% attack for different cryptocurrencies? by skitout on Monday January 27, 2020 @11:36AM (#22160904)
As far as the block chain is concerned they cannot... when they are not under attack. The attack can rewrite part of the history to double spend some crypto
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Re:Cost of a 51% attack for different cryptocurrencies? by pat2man on Monday January 27, 2020 @11:38AM (#22160936)
They cannot rewrite history. But they can create multiple histories and switch between them.
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