Alpenglow aims to cut Solana’s block finality from 12.8s to 150ms.
Voting starts in Epoch 840, requiring a 2/3 majority to pass.
Mainnet rollout targeted for early 2026 if governance succeeds.
The Solana blockchain is on the cusp of a transformative upgrade with the introduction of the Alpenglow consensus protocol, proposed under SIMD-0326.
Announced by Wu Blockchain on August 17, 2025, this upgrade aims to slash block finality from 12.8 seconds to an impressive 150 milliseconds, a 99% reduction that could redefine scalability in decentralized networks.
Solana’s new consensus proposal Alpenglow (SIMD-0326) has entered the community governance stage. The protocol aims to reduce block finality from 12.8s to ~150ms. Voting will take place between Epochs 840–420 (current epoch: 834, ~2 days each). The proposal passes if yes votes…
— Wu Blockchain (@WuBlockchain) August 17, 2025
Spearheaded by Anza’s research team, led by ETH Zurich’s Professor Roger Wattenhofer, Alpenglow replaces outdated mechanisms like Proof of History and Tower BFT with a modern architecture focused on performance and resilience. This shift, backed by a 2024 research paper highlighting liveness issues in Solana’s current system, promises to align Solana’s speed with Web2 applications.
The proposal enters the community governance phase between Epochs 840-842, starting approximately two days from now, with voting concluding by the end of Epoch 842. A successful vote requires a two-thirds majority of yes votes (out of yes + no votes) and a 33% quorum, including abstentions. This process, detailed on the Solana Developer Forums, leverages a Jito Merkle Distributor for stake-weighted voting. However, history suggests challenges—SIMD-228’s record 74.3% participation in March 2025 faced pushback from delegators, hinting at potential resistance despite the upgrade’s promise. If approved, a mainnet rollout is targeted for early 2026, pending ecosystem readiness.
Alpenglow’s design introduces Votor, a direct-vote protocol, and plans for Rotor, a new data dissemination system, to enhance efficiency. Off-chain voting and signature aggregation reduce costs, while the Validator Admission Ticket (VAT) ensures fair participation with a 1.6 SOL fee per epoch. This upgrade could boost transaction throughput, supporting Solana’s PayFi ambitions and attracting more dApps without congestion. Yet, the transition’s complexity and validator coordination risks loom large.
For Web3 enthusiasts, this vote is a pivotal moment—Solana’s ability to execute this overhaul could cement its as a high-performance blockchain leader.
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