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by vanzard 4089 days ago
This incident had nothing to do with zero-conf txs. In fact okpay did wait for multiple confirmations, and was still hit by this $10k double spend!

This whole thing was possible because of an accidental fork of the chain which lasted a few hours. This is the only accidental fork that occurred in the last 3 years.

Details: https://github.com/bitcoin/bips/blob/master/bip-0050.mediawi...