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Quick question - from someone who hasn't looked at bitcion since it was between 10c and $5 - since your transaction doesn't clear until the block propagates how they handle double spends?

The same way that restaurants make sure you pay instead of just leaving the building. It's mostly just not worth the hassle to save a few bucks.

Double spends are overwhelmingly a theoretical issue. Credit card fraud, on the other hand, is pandemic.

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