Explain the Concept of “Finality” in a PoS Blockchain

Finality refers to the guarantee that once a transaction or block is recorded on the blockchain, it cannot be reversed, altered, or reverted. In PoS systems, finality is often achieved when a supermajority (e.g. two-thirds) of the staked capital has attested to the block's validity.

This provides a stronger, more immediate guarantee of immutability than the probabilistic finality of PoW's longest chain rule.