How Does Transaction Finality Work in a pBFT-based System?

In a pBFT system, transaction finality is achieved immediately or very quickly after a supermajority (typically two-thirds plus one) of the known, honest validators agree on the order and validity of a block. Once this consensus threshold is met, the transaction is finalized and cannot be reversed.

This contrasts with probabilistic finality in PoW/PoS, which requires multiple block confirmations. Immediate finality is essential for high-value financial transactions.