Solana starts testing upgrade that could cut finality from 12.8 seconds to 150 milliseconds
Alpenglow would let exchanges, bridges and merchants treat payments as irreversible almost immediately.
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Summary
- Solana’s Alpenglow upgrade has moved to its public test network, where developers will test reducing transaction finality from about 13 seconds to 0.15 seconds.
- Alpenglow replaces Solana’s TowerBFT consensus system with Votor, which allows validators to finalize blocks after one or two rounds of direct voting without changing how users send funds.
- The initial testnet migration requires Agave 4.3 and will not support Firedancer or Frankendancer, while a Sept. 28 mainnet update remains tentative and is not a confirmed Alpenglow launch date.

