What Is the Role of ‘Finality’ in a PoS Consensus Mechanism?

Finality refers to the guarantee that once a block is confirmed, it cannot be reverted or changed, even if a temporary fork occurs. In PoS, a block achieves finality after a sufficient number of validators have attested to it, usually through two rounds of voting.

This provides a strong guarantee of immutability, which is crucial for decentralized applications (dApps) that rely on the chain's state.