Which mechanism provides fast finality across Avalanche chains?

• A. Trusted relays.
• B. Proof of Work with long finality.
• C. Centralized checkpoints.
• D. Snow consensus provides quick finality across chains.

Answer: (D)

Snow consensus enables fast finality across Avalanche chains. In this approach, each chain runs a randomized voting process where validators repeatedly sample others and push toward a common choice. When a supermajority in these samples favors a value, that choice becomes final with very high probability after only a few rounds. Because all chains use the same consensus mechanism and validators, finality on one chain quickly propagates to the others, giving rapid cross-chain finality. This stands in contrast to designs with trusted relays, long-proof-of-work delays, or centralized checkpoints, which don’t deliver the same low-latency, multi-chain finality.