The Alpenglow upgrade scheduled for October 21, 2026 replaces TowerBFT, the consensus mechanism used by Solana since its 2020 launch, with a new consensus mechanism named Votor

From the articleSOL news: Solana sets Oct. 21 for Alpenglow upgrade targeting 150-millisecond finalityAlso in Solana targets 150-millisecond finality with Alpenglow upgrade on Oct. 21