Alpenglow introduces two core components - Votor, which manages voting and block finalization, and Rotor, which replaces Solana’s proof-of-history with a more efficient data dissemination protocol.

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Alpenglow consists of Votor, which processes voting transactions and block finalization logic, and Rotor, a data dissemination protocol that would replace Solana’s proof-of-history timestamping system and aim to reduce the time it takes for all nodes to agree on the network state.
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.