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ZEC $1,339 Solana activates Alpenglow upgrade on mainnet with 150ms finality target
The consensus change replaces TowerBFT and aims to cut transaction finality by about 99%, though real-world performance is still to be measured.
Key takeaways
- Finality target. Alpenglow aims for roughly 150 milliseconds of finality, down from about 12.8 seconds.
- Launch timing. The upgrade went live on mainnet around 1:54 pm UTC on Oct. 21.
- Stake threshold. Validators holding at least 82% of staked SOL had to take part for the transition.
What happened
Solana activated Alpenglow on its mainnet around 1:54 pm UTC on Wednesday, Oct. 21, according to the Solana Foundation's Alpenglow dashboard. The upgrade is the network's first major consensus change and replaces TowerBFT, the system Solana has used since its 2020 launch.
The first phase, called Votor, lets validators send votes directly to each other instead of recording each vote onchain. Those votes are grouped into certificates that can settle consensus in one or two rounds. The migration was designed to happen within a single slot after a transition period of about 18 minutes, and it required validators holding at least 82% of staked SOL to take part.
Anza, the Solana-focused engineering firm, worked on the upgrade for approximately 18 months with other contributors. Anza researchers described Alpenglow as the biggest change to Solana's core protocol since genesis. The upgrade does not change how Solana executes transactions, so existing applications, smart contracts and fee mechanisms remain intact.
First $122.11Latest $106.92-12.4% over the period
Points are daily observations, not closing prices.
Why it matters
The Solana Foundation says Alpenglow seeks to cut transaction finality by 99%, to roughly 150 milliseconds from about 12.8 seconds. Faster finality could mean quicker payments, trade settlements and more responsive applications. Anza researchers wrote on May 19 that 150-millisecond latency could let Solana compete with Web2 infrastructure in responsiveness.
At press time, the Solana mainnet showed 6.6-second transaction finality and throughput of 4,721 transactions per second, according to the Alpenglow dashboard. Bitcoin.com News reported that actual performance will depend on network conditions. Because validator votes no longer appear as ordinary transactions, reported transaction counts could fall without a matching drop in user activity.
The SOL token rose nearly 3% in the 24 hours before the upgrade, reversing part of a 42% decline over the past year, according to CoinMarketCap. Market data showed SOL at $106.92 on Oct. 21.
What is still unclear
- Cointelegraph has asked the Solana Foundation for comment on Alpenglow's finality measurements in testnet environments and its expected performance in real-world applications.
- A second component, Rotor, is meant to change how blocks are distributed among validators, but it does not yet have a scheduled activation date.
Questions readers ask
What is Solana's Alpenglow upgrade?
Alpenglow is Solana's first major consensus upgrade. It replaces TowerBFT with a voting protocol called Votor, which lets validators exchange votes directly and form certificates instead of recording every vote onchain.
How much faster is Alpenglow finality?
The Solana Foundation targets roughly 150 milliseconds of finality, down from about 12.8 seconds, a reduction of about 99%. At press time the mainnet dashboard showed 6.6-second finality.
When did Alpenglow go live?
It went live on mainnet around 1:54 pm UTC on Wednesday, Oct. 21, 2026, according to the Solana Foundation's dashboard.
What is Rotor in Alpenglow?
Rotor is a later phase of Alpenglow that would replace Turbine as the block data-distribution protocol. It does not yet have a scheduled activation date.
