On Saturday, June 20, 2015 1:23:03 AM Aaron Voisine wrote:
> They don't need to be made cryptographically safe, they just have to be
> safer than, for instance, credit card payments that can be charged back. As
> long as it's reasonably good in practice, that's fine.

They never will be. You can get a decent rate of success merely by making one 
transaction propagate fast (eg, 1 input, 1 output) and the other slow (eg, 
1000 inputs, 1000 outputs) and choosing your peers carefully. The only reason 
unconfirmed transactions aren't double spent today is because nobody is 
seriously *trying*.


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