But don't most exchanges have a bigger delay for withdrawing? In order to escape with anything, you would have to withdraw before the exchange was aware of the

But don't most exchanges have a bigger delay for withdrawing? In order to escape with anything, you would have to withdraw before the exchange was aware of the double-spend, and at that point, they'd freeze your account. The exchange might be on the hook for honoring the phantom coins other users think they bought, but you haven't profited. Am I missing something?