Solana’s planned upgrade to make payments final in a fraction of a second has reached its public developer network, giving application teams a place to test before it reaches the blockchain carrying real money.

Called Alpenglow, the upgrade targets roughly 150 milliseconds for finality, the point at which a transaction can no longer be reversed, compared with about 12.8 seconds under the existing system.

That could shorten the wait for an exchange to release deposited funds or a payment app to tell a merchant a sale is complete.

Anza, the company building Solana’s core software, announced the developer-network switch on Sept. 25, a day after the separate testnet completed its transition. The Solana Foundation’s upgrade page lists Alpenglow as active on both networks.

Developers use the developer network, or devnet, to check applications with tokens that have no real value. The separate testnet is used primarily to stress-test network software and validator operations.

Alpenglow changes how validators, the computers that check transactions, agree on the network’s records. They will exchange votes directly instead of recording those votes as transactions inside blocks, the batches of transactions added to the blockchain. Agreement can then take one or two voting rounds.

Removing those votes will also make some Solana activity charts fall. Transaction totals that include validator votes will shrink even if users make just as many payments and trades. The Foundation has told data providers to adjust their comparisons.

Services that build transaction histories also need to keep competing candidate blocks separate until the network selects one.

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