Re:Stripe: Bitcoin Sign-up
by hendzen on Thursday March 27, 2014 @03:00PM
(#7482574)
As you said, even if the original tx has propagated, a double spending tx with a higher fee will jump the line in a miner's mempool. Never assume miners are altruistic - they seek primarily to maximize their profit. Propogation is a useful heuristic, but its not a panacea.
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For most miners at the present time this is not true. The reference code does not do this, and most mining pools are running something close to the reference code. (And furthermore, most such txes will never transit the network in any case, because most nodes will refuse to relay them.)