Alpenglow is Solana’s protocol rewrite (SIMD‑0326) that replaces PoH and TowerBFT with Votor and Rotor, cutting transaction finality to sub‑150ms and improving validator efficiency and attack resilience. Validators approved activation with 98.27% backing; mainnet launch is targeted in 2026.
Alpenglow approved by SOL validators with 98.27% support
Alpenglow replaces Proof of History and TowerBFT with Votor (consensus) and Rotor (propagation)
Expected finality reduction to sub‑150ms and increased attack resilience; mainnet target: H1 2026
Meta description: Alpenglow Solana upgrade approved by validators; sub‑150ms finality, Votor and Rotor changes. Read implications for Solana vs Ethereum in 2026 — COINOTAG.
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Alpenglow is Solana’s SIMD‑0326 protocol rewrite that removes Proof of History and TowerBFT and introduces Votor (consensus) and Rotor (data propagation). The upgrade is designed to reduce transaction finality to sub‑150ms while improving resource efficiency and validator resilience.
Validator participation reached 52% of active validators in the vote, and the proposal earned 98.27% support among stakers. Opposition was 1.05% with 0.36% abstaining. These figures reflect strong network consensus and clear validator endorsement of the architecture change.
Alpenglow replaces PoH and TowerBFT with a leaner model: Votor simplifies voting and consensus logic, while Rotor optimizes data propagation to align bandwidth with stake distribution. As a result, block validation time is expected to fall from ~12.8s observed historically in some edge cases to ~150ms and, in ideal conditions, below 100ms.
Votor is a streamlined consensus protocol that reduces voting complexity and improves validator coordination. Rotor is a propagation layer that minimizes latency by matching data flow to stake distribution and minimizing redundant bandwidth. Together they reduce latency and resource usage while maintaining finality guarantees.
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