Solana (SOL) Activates Alpenglow as Price Falls 11.9% From Oct. 5 Close

Solana (SOL) activated Alpenglow on its mainnet Oct. 21, replacing TowerBFT with a protocol designed to speed transaction finality as the token’s Oct. 20 close stood 11.9% below Oct. 5. The handoff took effect at slot 459,653,000 at about 10 a.m. ET (14:00 UTC), roughly 24 minutes after epoch 1064 began at 9:36 a.m. ET (13:36 UTC). Alpenglow targets finality—the point when a transaction is treated as irreversible—in roughly 150 milliseconds. That figure is a design target, rather than a measure of sustained performance after the mainnet switch. The 12.8-second comparison with TowerBFT uses the older 400-millisecond slot schedule.