Solana Activates Alpenglow As Anza Targets Millisecond Finality

TL;DR: Anza says Alpenglow activated on Solana mainnet-beta on October 21. The consensus change targets roughly 150-millisecond finality; further networking and post-quantum improvements remain planned work. Core engineering firm Anza announced the Alpenglow activation at slot 459,653,000, around 14:00 UTC on Wednesday. According to the company, validators retired TowerBFT during the transition without moving activity to a separate chain. Anza describes the design as reducing the path to finality from approximately 12.8 seconds to around 150 milliseconds. That is the developer’s stated performance target, not a network-wide latency measurement independently reproduced for this article.