Solana activates Alpenglow, targeting 150ms transaction finality

Solana activated Alpenglow on mainnet on October 21, replacing the consensus system it has used since 2020 and targeting transaction finality in about 150 milliseconds. The Solana Foundation’s upgrade page says the change went live at the start of epoch 1064.

Faster finality could let payment and trading services treat funds as settled sooner.

How does Alpenglow change transaction settlement?

Alpenglow changes how validators agree on blocks. Under the previous system, validators recorded votes as on-chain transactions, and a block became final after enough votes accumulated; Solana says that took about 12.8 seconds. Now validators send votes directly to each other and combine them into certificates, allowing a block to become final after one or two voting rounds.

The roughly 150-millisecond figure is a target, not a guaranteed wait for every transaction. As CoinDesk reported on the launch, the time it takes an app to show finality also depends on how quickly the service receives that information.

What changes for people using Solana?

Users can keep their existing wallets and apps, and transaction fees and execution remain unchanged, according to the Foundation. No migration or new signing steps are needed to send transactions.

Services that wait for finality before releasing goods, crediting an exchange deposit or making funds available could act sooner. The actual experience will depend on how each service handles settlement and displays the update.

Why might Solana transaction counts fall?

Validator votes no longer appear as transactions in blocks, so dashboards that counted those votes will show lower totals after the change. That drop does not by itself mean users are making fewer payments or trades; comparisons with earlier activity need to separate validator votes from user transactions.

For validator operators, the economics change too: Solana requires at least 0.8 SOL in a vote account to pay the Validator Admission Ticket each epoch. The Foundation says a validator without enough in that account will not vote or produce blocks in the following epoch. The upgrade changes consensus, while transaction execution and user fees stay the same.

Sources

• Solana Foundation’s upgrade page — solana.com
• CoinDesk reported on the launch — coindesk.com