Solana’s Alpenglow Upgrade Scheduled for October 21, Targets Finality Cut from 12.8 Seconds to 150ms Solana core developer Anza announced that the Alpenglow consensus upgrade is scheduled to go live on Solana mainnet-beta on October 21 at approximately 14:50 UTC. The upgrade will replace the existing TowerBFT consensus mechanism with Votor, aiming to reduce transaction finality from approximately 12.8 seconds to 150 milliseconds. Under the new mechanism, validators will exchange votes directly instead of submitting them as onchain transactions, potentially causing a significant decline in reported transaction totals that include validator votes. Alpenglow was previously activated on testnet on September 24 and devnet on September 25.