Solana sets Oct. 21 for Alpenglow upgrade targeting 150-millisecond finality
In this news:
Key takeaways
- Solana scheduled the Alpenglow upgrade for October 21.
- The upgrade targets transaction finality in roughly 150 milliseconds.
- Validator votes will be exchanged directly rather than recorded on the blockchain.
Solana has scheduled Oct. 21 for Alpenglow, a major upgrade aimed at making transactions irreversible in roughly 150 milliseconds by changing how the computers running the network agree on payments.
The updated timetable published by the Solana Foundation sets a date for replacing TowerBFT, the voting system Solana has used since its launch in 2020. The 150-millisecond figure remains a target, with actual performance depending on network conditions.
How finality improves transaction speed
This matters as a Solana payment can already appear successful almost immediately. But Alpenglow aims to offer a stronger guarantee that it cannot be undone almost as quickly.
A merchant waiting for that assurance before accepting a payment, or a bridge before releasing funds on another blockchain, could act sooner.
Changes to validator voting and metrics
As of today, validators, the computers that check transactions and help secure Solana, submit their votes as transactions recorded on the blockchain. Alpenglow will let them exchange votes directly and combine enough approvals into a certificate that finalizes a block after one or two voting rounds.
That could produce an odd result on activation day, however. Solana’s transaction count may fall sharply because validator votes disappear from blocks, even if people keep trading and making payments at the previous pace.
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