CoinDesk
Solana has moved the Alpenglow upgrade to its public testnet, where developers will try to cut transaction finality from about 12.8 seconds to 0.15 seconds. Finality is the moment a payment becomes irreversible, the checkpoint exchanges, bridges and merchants wait on before crediting deposits, releasing cross-chain funds or treating a sale as settled. The upgrade replaces Solana's TowerBFT consensus with Votor, a protocol in which validators send votes directly to one another and finalize blocks after one or two rounds.
Why it matters
Finality is the latency floor for payments infrastructure. At roughly 13 seconds, deposit crediting and bridge releases carry a built-in wait; at 150 milliseconds, payments on Solana start to behave like card-network instant settlement, a meaningful gap to close as stablecoins move into regulated finance. Users notice no change: applications keep executing transactions exactly as they do today, with no wallet or sending-flow updates required. Alpenglow has already spent more than four months on a smaller purpose-built network, so the testnet move tests whether the broader fleet of computers and services already running the blockchain can switch together.
Market impact
Validators taking part need Agave 4.3, the main client maintained by Anza, which recommended it to all mainnet validators on Sept. 21 after staged rollouts to operators covering 10% and then 25% of staked SOL. Firedancer and Frankendancer won't be supported in the first migration, so it runs entirely through Agave. Sept. 28 appears on Anza's schedule as a tentative mainnet date for Agave 4.3 features, but it is not a confirmed Alpenglow launch. Watch testnet stability and whether mainnet validators coalesce behind the switch.
Frequently asked questions
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What does Solana's Alpenglow upgrade change?
It replaces Solana's TowerBFT consensus with Votor, a protocol where validators send votes directly to one another and finalize blocks after one or two rounds instead of stacking votes across 32 slots.
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How much faster is finality under Alpenglow?
Solana targets cutting transaction finality from about 12.8 seconds to 0.15 seconds, meaning payments become irreversible almost immediately.
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Do Solana users need to change wallets or how they send funds?
No. Applications keep executing transactions as they do today, and the consensus change happens below the user-facing layer.
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When will Alpenglow launch on Solana mainnet?
Sept. 28 appears on Anza's schedule as a tentative date for enabling Agave 4.3 features on mainnet, but it is not a confirmed Alpenglow launch date.
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Does the first Alpenglow migration support Firedancer?
No. The initial testnet migration requires Agave 4.3 and does not support Firedancer or Frankendancer, so it runs entirely through the Agave client.
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