Translations:VeriBlock and Proof-of-Proof FAQ/44/en

In the event that an attacker is producing an alternate chain, they have to publicly publish fingerprints of their attacking chain in-step with the normal block mining of the legitimate network, which will delay Bitcoin finality until the attacker stops expending resources. In the absence of an attack (or when the attacker abandons their attack and stops building the alternate chain), BFI can indicate that the transaction is as secure to accept on Bitcoin itself.