--- title: "Solana activates Alpenglow consensus upgrade, cutting finality to 150 milliseconds" description: "Solana activated its Alpenglow consensus upgrade, replacing TowerBFT and reducing transaction finality from 12.8 seconds to about 150 milliseconds, The Block reported. The outlet described it as a network overhaul. Reported by The Block on 2026-10-21. SOL -2.17% in the 24 hours after detection." language: en canonical: "https://whycoinmoves.com/en/events/solana-anza-s-alpenglow-goes-live-e8cc9c46903ef0" published: 2026-10-21T14:27:52.000Z updated: 2026-10-22T14:29:21.000Z indexable: false --- # Solana activates Alpenglow consensus upgrade, cutting finality to 150 milliseconds Solana activated its Alpenglow consensus upgrade, replacing TowerBFT and reducing transaction finality from 12.8 seconds to about 150 milliseconds, The Block reported. The outlet described it as a network overhaul. Reported by The Block on 2026-10-21. SOL -2.17% in the 24 hours after detection. Attributed sources: [The Block]() ## Key facts Solana activated its Alpenglow consensus upgrade, replacing TowerBFT and reducing transaction finality from 12.8 seconds to about 150 milliseconds, The Block reported. The outlet described it as a network overhaul. Evidence strength: Single source, 1 publisher group(s) (The Block); this describes source coverage, not truth or causation. After site detection, observed returns were 5 minutes: -0.07% (difference from BTC +0.03 pp; 21/10/2026, 14:27 → 21/10/2026, 14:33, UTC; Gate · USDT); 1 hour: +1.39% (difference from BTC +0.92 pp; 21/10/2026, 14:27 → 21/10/2026, 15:28, UTC; Gate · USDT); 24 hours: -2.17% (difference from BTC +0.69 pp; 21/10/2026, 14:27 → 22/10/2026, 14:27, UTC; Gate · USDT). Unlisted windows are unavailable. In the preceding 30 days, the 99th percentile of absolute hourly returns was 2.01% (OKX · USDT; cutoff 21/10/2026, 14:27, UTC). This hourly baseline is not directly comparable with a minute move. ## Returns after site detection | Window | Return | BTC | Difference from BTC | Actual sampled interval (UTC) | Source | | --- | --- | --- | --- | --- | --- | | 5 minutes | -0.07% | -0.10% | +0.03 pp | 21/10/2026, 14:27 → 21/10/2026, 14:33 | Gate · USDT | | 1 hour | +1.39% | +0.47% | +0.92 pp | 21/10/2026, 14:27 → 21/10/2026, 15:28 | Gate · USDT | | 24 hours | -2.17% | -2.86% | +0.69 pp | 21/10/2026, 14:27 → 22/10/2026, 14:27 | Gate · USDT | ## Historical hourly baseline | Metric | Value | | --- | --- | | Ready | true | | Coverage | 100.0% (720/720) | | Median absolute hourly return | 0.28% | | 99th percentile of absolute hourly returns | 2.01% | | BTC beta | 1.46 | | Source / cutoff (UTC) | OKX · USDT / 21/10/2026, 14:27 | ## Claims and open questions - The Block reported that Solana activated Alpenglow, replacing TowerBFT. - The Block reported that transaction finality fell from 12.8 seconds to about 150 milliseconds. - What share of validators upgraded to the Alpenglow client at activation, which on-chain or client-release data would confirm? - Did the Solana Foundation or Anza publish an official statement confirming the activation, its timing and the finality figures? ## Source evidence - [Anza’s Alpenglow goes live on Solana, cutting finality to 150 milliseconds]() — The Block; published 21/10/2026, 14:24; received 21/10/2026, 14:27 (UTC). ## Recent SOL events and market reactions - [Solana activates Alpenglow consensus upgrade on mainnet]() — Published 21/10/2026, 04:35 (UTC) · Multiple publishers (3 publishers) · Project updates · 5m -0.14% / 1h +0.09% / 24h -0.51% - [Why did SOL drop 1.59% in 5 minutes? Evidence check: Solana falls as most tracked coins move lower · 2026-10-20]() — Received 20/10/2026, 15:14 (UTC) · Cause unresolved · Market watch · 5m -0.16% / 1h +0.64% / 24h +2.63% - [Solana study models geo-aware leader schedule proposal SIMD-0675]() — Published 14/10/2026, 15:05 (UTC) · Official source (1 publisher) · General news · 1h -0.32% - [SkyAI sells entire Solana treasury and launches $201 million buyback]() — Published 19/10/2026, 21:04 (UTC) · Multiple publishers (2 publishers) · General news · 1h -0.32% - [Full coin archive]() ## Research for this archive - [Altcoin beta to Bitcoin: BTC, ETH, SOL and DOGE hourly returns]() - [Perpetual funding rates and annualized yield: a 2025 comparison]() - [Crypto listing and delisting effects: an OKX price study]() - [Do token unlocks lower prices? SUI, SOL and high FDV claims]() [Methods and limitations]() Publisher count is not independent evidence count. Price changes cannot verify news or prove causation.