The Solana development team is proposing a significant overhaul of the consensus mechanism through the Alpenglow proposal, which is currently under vote by validators. As of Thursday morning, over 10% of validators have expressed support for the upgrade, with the majority yet to cast their votes.
If approved, the upgrade will replace the existing Proof-of-History and TowerBFT consensus mechanisms with a more efficient and resilient design, featuring two new components: Votor and Rotor. The current Proof of History mechanism timestamps transactions, enabling validators to agree on the correct order without needing to synchronize, thereby reducing network latency. TowerBFT, on the other hand, is the network's voting system, where validators use previous votes as a reference to quickly reach consensus on the next block while resisting potential attacks.
The new Votor consensus proposal promises to significantly reduce transaction finalization time from over 12 seconds to approximately 150 milliseconds, effectively providing instant confirmations for users. Rotor, planned for a later phase, aims to enhance network efficiency by minimizing data transfer between validators, supporting high-traffic applications such as DeFi and gaming.
The '20+20' resilience model introduced in Alpenglow ensures the network's continuity even in the event of 20% of validators being adversarial and another 20% being offline, marking a step towards achieving faster speeds while bolstering security and fairness for validators.