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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

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.

skitout 7y ago
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
- pat2man 7y ago
  They cannot rewrite history. But they can create multiple histories and switch between them.