Solana’s 150-millisecond settlement upgrade reaches second public test network

PRODUCTSolana’s 150-millisecondsettlement upgrade reachessecond public test network21IMPORTANCECLOSED3NEWS MEDIA3PIECESSep 26, 2026 08:11blockboard.net
In Solana

Solana’s Alpenglow upgrade is now live on its developer network, and a second public test network has also been switched on. The rollout gives application teams a place to test software before the live chain changes, while the upgrade targets much faster transaction settlement than the current system. One report also places the devnet handoff at slot 504,148,999 and says TowerBFT was replaced there.

What this rests on

Claim by claim, with its source
✓
Alpenglow is active on Solana’s devnet and testnet, giving application teams places to check their software before the live blockchain switches.
✓
The upgrade is designed to cut transaction settlement time to about 150 milliseconds from 12.8 seconds.
✓
Solana’s public developer network now lets teams test a system aimed at roughly 150 milliseconds of finality instead of about 12.8 seconds.
✓
Alpenglow went live on Solana’s devnet on Sept. 25, and the handoff completed at slot 504,148,999.
✓
The upgrade replaces TowerBFT on the developer network and opens a testing period before migration to mainnet-beta.

What it means

Who it affects, what changes and what is still unconfirmed

Each sentence links inside to the piece that supports it.

Application teams are the immediate group that can notice this change, because they now have public networks to test against before the live chain changes. That matters for developers building on Solana today, since the upgrade is already active on devnet and testnet rather than only being described as a future plan.

In practice, the testing setup now includes Alpenglow on devnet and testnet, and one part of the network has already moved away from TowerBFT. What stays the same is that this is still a testing period ahead of mainnet-beta, so the live network has not been described as switched over yet.

Market reaction

SO Solana it is the asset of the company or protocol in the event from 2 h before to 4 h after the line marks the first headline
published
+0.15 % before publication
+0.48 % after
$121price at publication
12series points

How the story was built

Every piece in order, with the time its news medium declares — if it is not believable we use ours and say so — and what it added to what was already known at that point. Arriving first is not the same as adding something.

+3 h 8 m
Sep 26 08:07
crypto.news echo
No new facts: foundation, designed, letting; with quotes
+9 h 38 m
Sep 26 14:37
The Defiant context
Its angle: completed, consensus, migration; with quotes

Has this happened before?

WhenWhat happenedFigure
22 days ago Solana Stablecoins Now Book Flights With 300 Airlines event 1 actors in common · 3 news media
22 days ago Kamino Opens GPU-loan-linked sUSDai Collateral Market on Solana event 1 actors in common · 2 news media

What could happen next

What the prediction markets currently price as likely. This is context, not a forecast of ours: there is money on it, and that is all we show.

0 % no series
Kalshi · $1,148,516 of open interest · resolves on Oct 2, 2026
0 % no series
Kalshi · $1,135,683 of open interest · resolves on Oct 6, 2026
5 % no series
Kalshi · $874,949 of open interest · resolves on Oct 1, 2026
0 % no series
Kalshi · $850,999 of open interest · resolves on Oct 2, 2026