How Does the Concept of “Finality” in a Blockchain Relate to 51% Attack Defense?

Finality in a blockchain refers to the point at which a transaction can be considered irreversible. In a Proof of Work system, finality is probabilistic, meaning that the more confirmations a transaction has, the more likely it is to be final.

A 51% attack can undermine this by reversing transactions that were previously considered final. Some blockchains have implemented mechanisms to achieve faster finality, which can help to mitigate the risk of a 51% attack.