Solana activates Alpenglow, targeting 150ms transaction finality

Solana has used the same consensus system since its 2020 launch. On Wednesday, Oct. 21, it activated Alpenglow, a replacement designed to make transactions final in about 150 milliseconds, according to Decrypt’s report on the mainnet launch.

Faster finality could let services treat payments and deposits as settled sooner, without asking users to change wallets.

What changes when a Solana payment is final?

Finality is the point when an application can treat a transaction as settled and irreversible. Under Solana’s previous system, TowerBFT, full finality took about 12.8 seconds; Decrypt reports Alpenglow targets roughly 150 milliseconds.

That distinction matters because some apps show a transaction as confirmed before it has reached full finality. The upgrade aims to shorten the remaining wait, which could help an exchange credit a deposit sooner or a merchant confirm a stablecoin payment with less delay.

How does Alpenglow reach the target?

Alpenglow changes how validators—the computers that check transactions and agree on the ledger—vote. Instead of recording those votes as blockchain transactions, validators send them directly to each other and combine approvals into certificates.

Those certificates can make a block final after one or two voting rounds. Solana’s live network explorer lists Alpenglow as the active consensus system and gives slot 459,652,999 as its genesis slot; the switch took place at the following slot, 459,653,000, according to Decrypt.

The 150-millisecond figure is a target, not a guarantee for every transaction. Network conditions and how quickly a wallet, exchange or other service receives finality information can affect what users experience.

Do users need to change wallets or pay more?

No wallet change is required, and CoinDesk reports that fees and applications remain unchanged. The change happens in the network’s validator voting process, so people can keep using their existing Solana apps.

One visible difference may appear in network dashboards: validator votes no longer count as on-chain transactions. CoinDesk says headline transaction totals may fall as a result, even if user payments and trades continue at the same pace.

For users, the practical benefit depends on whether the service they use acts on full finality. Faster settlement gives those services the option to release funds or goods sooner, but the upgrade does not by itself guarantee that every app will update its confirmation flow.

Sources

• Decrypt’s report on the mainnet launch — decrypt.co