Solana's Alpenglow upgrade goes live Wednesday, targeting 150-millisecond finality
Solana switches on Alpenglow on Wednesday
Solana is expected to activate Alpenglow on Wednesday, described as its biggest network overhaul since 2020. The upgrade changes how validators — the computers that process transactions and vote on which ones are valid — agree with each other.
The goal is to cut the time it takes for a transaction to become irreversible, known as finality, from about six seconds to roughly 150 milliseconds. That is about 40 times faster, according to the source material.
The switch is set for the start of epoch 1064 on Wednesday, with the actual change at slot 459,653,000 after a 5,000-slot transition.
How Alpenglow changes the way votes are counted
- Today, every validator writes its votes directly onto the blockchain like any other transaction. A payment is not locked in until enough votes stack up, which takes about six seconds.
- Alpenglow moves voting off the chain and bundles votes into certificates that can lock in a transaction in one or two rounds.
- Validators currently spend about 2 SOL a day on vote fees. That cost doubled after Solana recently cut slot times — the window each block gets — to about 200 milliseconds.
- Alpenglow removes those fees and replaces them with a flat entry charge called a validator admission ticket, set at 0.8 SOL per epoch, a period of about 24 hours. The source describes this as roughly 60% cheaper.
Six test-network restarts and a failed migration
The path to launch was not smooth, per a post from Galaxy Digital, one of roughly 100 validator operators on the test network. The test network was wiped and restarted from scratch six times since launching in early May, and one attempt to migrate to the new system failed network-wide and had to be rolled back. A later migration went through, clearing the way for Wednesday's launch.
According to the source material, none of that put real money at risk, because it all happened on a network built for exactly that kind of breakage.
What a validator operator says to expect
Robin Nordnes, CEO and founder of Raiku, which builds trading infrastructure on Solana, said in an email that Solana's transaction count will look much lower this week and that this does not signal a problem. He said most of what was counted before was validators voting, and that voting is off-chain now, while trading activity continues.
Nordnes also said that for trading desks, faster finality is welcome but was never the main obstacle, and that being close to where the block is built remains the bigger factor.
What is confirmed
- Alpenglow is scheduled to activate on Wednesday, starting at epoch 1064, with the change at slot 459,653,000 after a 5,000-slot transition.
- The upgrade replaces on-chain validator voting with off-chain voting bundled into certificates.
- The stated finality target is about 150 milliseconds, compared with roughly six seconds today.
- The validator admission ticket is set at 0.8 SOL per epoch, described as about 60% cheaper than the previous vote fees.
- The test network was restarted six times, and one migration attempt failed and was rolled back before a later migration succeeded.
What is still unclear
The 150-millisecond figure is a target. The source says it is not yet confirmed how the upgrade will perform on mainnet.
The source also does not say how quickly exchanges and payment apps will change their own waiting times for deposits, even though it notes they currently make users wait before treating a deposit as done.
Why the finality change matters
Finality is the point at which a transaction can no longer be reversed. Six seconds can be a long time in a fast market, because a price can move before a trade is locked in. Cutting that wait could make trading and payments on Solana feel closer to a card payment or a trade on a centralized exchange, which is a platform run by a company rather than by the network itself.
For comparison, the source says Ethereum takes roughly 13 minutes to reach full finality.
Sources
Newisty Editorial Team covers technology, cryptocurrency, digital products, online platforms, developer tools and the wider digital economy. Our content is researched from official sources, company announcements, public documentation, market data and other primary or reputable sources. Articles are reviewed and edited before publication for clarity, accuracy and useful context.