Solana just got a lot faster. Anza, the core development organization behind Solana, has completed the first successful Alpenswitch on the Alpenglow community cluster. The result: transaction finalization times dropped from approximately 12.8 seconds to around 100-150 milliseconds.
What Alpenglow actually changes
Finality is the point at which a transaction is considered irreversible. Until a transaction is finalized, there’s a theoretical window where it could be reversed or reorganized. Solana’s previous consensus mechanism, Tower BFT, paired with its block propagation system called Turbine, delivered finality in about 12.8 seconds. Alpenglow replaces both of those systems entirely.
Tower BFT gets swapped for a new consensus component called Votor. Turbine gets replaced by Rotor. Together, they form the backbone of the Alpenglow protocol.
Votor can finalize blocks in a single round if 80% of stake is participating and voting correctly. If participation dips to 60% of stake, it still gets the job done in two rounds. The system is designed to tolerate up to 20% malicious actors and an additional 20% of validators being offline simultaneously.
