Solana's Alpenglow — the biggest consensus overhaul in its history — is now live for testing!

Solana developer Anza has deployed Alpenglow, the network's most ambitious consensus redesign to date, onto a community test cluster — the last major milestone before a potential mainnet rollout. Validator operators can now run software that replaces Solana's current hybrid of Proof-of-History, TowerBFT, and Proof-of-Stake with a new architecture built to dramatically cut finality times and improve network responsiveness under heavy load. "The biggest consensus change in Solana's history, now running on validator infrastructure ahead of mainnet," Anza wrote on X.

The upgrade matters because Solana's existing design, while fast and cheap, has drawn criticism for outages during peak demand. Alpenglow targets that structural weakness directly. A successful test-cluster run is the clearest signal yet that a mainnet upgrade is on the horizon.

Elsewhere in the week's protocol news: Ronin is…