Solana
Solana Activates Alpenglow Upgrade to Target Faster Transaction Finality
Core developer Anza has deployed the Alpenglow consensus protocol on the Solana mainnet-beta, aiming to lower transaction finality to roughly 150 milliseconds.
Solana core engineering firm Anza announced the activation of the Alpenglow consensus upgrade on the mainnet-beta network on October 21. Triggered at slot 459,653,000 around 14:00 UTC, the update replaces the network's long-standing TowerBFT protocol without requiring activity to migrate to a new chain.
The upgrade primarily aims to cut transaction finality—the point at which a transfer is deemed irreversible under network rules—from roughly 12.8 seconds to approximately 150 milliseconds. The report notes that this figure represents Anza's engineering target rather than an independently verified network measurement. While faster settlement reduces waiting times for payment processors and trading venues, it does not directly increase transaction throughput or eliminate user-side latency such as wallet signing and connection speeds.
Additional initiatives on Anza's development roadmap include Rotor, geographically aware leader rotation, and a post-quantum design dubbed Quantumglow, though none have confirmed release schedules. The practical impact of Alpenglow will depend on how the consensus mechanism performs under varying live network traffic.
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