Solana’s Alpenglow Goes Live for Community Testing as Mainnet Target Moves to Next Quarter

Solana developer Anza said Monday that Alpenglow, the biggest proposed consensus overhaul in the network’s history, is live on a community test cluster, marking the most significant step yet toward a potential mainnet rollout.

The community cluster lets external validator operators run the new consensus code in a live environment for the first time. Internal testing had previously been limited to roughly 45 nodes. “Alpenglow is live on the community test cluster,” Anza wrote on X. “The biggest consensus change in Solana’s history, now running on validator infrastructure ahead of mainnet.”

This story is an excerpt from the Unchained Daily newsletter.

The upgrade replaces two of Solana’s core mechanisms: TowerBFT, which validators currently use to agree on the state of the chain, and Proof-of-History, the cryptographic clock that timestamps transactions. The new architecture is built around two protocols, Votor and Rotor, which together aim to reduce transaction finality from roughly 12.8 seconds to around 150 milliseconds, a near 100-fold improvement, while freeing up block space currently consumed by validator vote transactions.

Validators overwhelmingly approved the upgrade last September, with 98% voting in favor under SIMD-0326. Developers are also testing what they have dubbed “Alpenswitch,” the validator migration between TowerBFT and Alpenglow in a live network setting.

The mainnet timeline has slipped from earlier hopes of a Q1 release. Anatoly Yakovenko, Solana co-founder, said at Consensus Miami last week that mainnet activation could come next quarter if testing proceeds smoothly. Anza Lead Economist Max Resnick told Decrypt that next steps include packaging Alpenglow into an Agave release and activating it on testnet before any mainnet move.

The implications cut beyond throughput. Faster, deterministic finality is what high-frequency trading venues, exchanges, and payments rails need to credit deposits and settle transactions quickly. SOL traded around $97 on Monday, up roughly 15% over the past month but still about 67% below its January 2025 all-time high.