Alpenglow is a proposed consensus upgrade for the Solana blockchain that replaces both the TowerBFT finalization system and the proof-of-history timestamping mechanism.

Quotes that support claims

The upgrade replaces Solana’s existing TowerBFT proof-of-stake consensus mechanism and proof-of-history timestamping system with new components called Votor and Rotor.

Anza proposed a new Solana consensus protocol to replace TowerBFT and the proof-of-history system, aiming to bring Web2-level speed to the network.