Alpenglow aims to cut transaction finality from 12.8 seconds to just 150 milliseconds, marking one of Solana's biggest infrastructure overhauls.

Solana will replace its blockchain's consensus system on Oct. 21, targeting transaction finality in approximately 150 milliseconds.

On Oct. 13, Anza, the blockchain network's core developer, announced the mainnet activation date, setting the stage for one of the most significant infrastructure changes in Solana's history.

The upgrade, known as Alpenglow, will replace TowerBFT, the mechanism that currently takes approximately 12.8 seconds to finalize transactions. If successful, the change would reduce finality times by nearly 99%, bringing the network closer to instantaneous settlement.

The planned overhaul follows Solana's recent reduction in block-production times to about 200 milliseconds, another improvement designed to speed up transaction processing.

However, Alpenglow addresses a different limitation: the delay between processing a transaction and the point at which the network considers it irreversible.

Under Solana's existing consensus mechanism, validators establish finality by submitting votes as blockchain transactions, with agreement accumulating across multiple blocks.

Alpenglow introduces a new system called Votor, which allows validators to exchange votes directly and combine them into cryptographic certificates. This lets blocks become final after one or two voting rounds, significantly reducing the time needed to reach network-wide agreement.

According to the Solana Foundation, the change could benefit financial applications that depend on finalized transactions before releasing funds or executing subsequent operations.

For instance, payment providers could reduce the time between receiving a transfer and treating the funds as settled, while trading platforms could complete settlement-dependent operations more quickly.

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