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Solana has scheduled its Alpenglow consensus upgrade for epoch 1064, expected to begin around 15:00 UTC on Oct. 21. The upgrade targets transaction finality in about 150 milliseconds, but actual speed will depend on network conditions; validators must prepare compatible software for the migration.
Solana is scheduled to begin its Alpenglow upgrade on Oct. 21, replacing the network’s TowerBFT voting system with a new process targeting transaction finality in about 150 milliseconds. The Solana Foundation’s timetable places the migration at epoch 1064, expected to start around 15:00 UTC; the speed is a target, not a guarantee, and will depend on network conditions.
Alpenglow changes how validators—computers that check transactions and help secure the network—agree on blocks. Under the current system, validators submit votes as transactions recorded on Solana. The upgrade will instead let validators exchange votes directly and combine enough approvals into a certificate. According to the report, a block could be finalized after one or two voting rounds.
The rollout is planned in stages. Solana will retain the existing voting system for the first 5,000 slots, the short intervals used for block production, after the scheduled start. The switch to Alpenglow is expected roughly 18 minutes later. These are timetable estimates in the source report, rather than a claim that all network conditions or validator behavior are fixed in advance.
Validator operators need software built on Agave 4.3.0 for the migration. Operators using the alternative validator clients Firedancer or Frankendancer will need to switch software temporarily because those clients will not support the initial migration, according to the report. The upgrade also changes validator charges: current voting fees of roughly 1 SOL per epoch are to be replaced by a flat admission fee of 0.8 SOL. An epoch is a period in which Solana assigns validators network responsibilities.
Faster Settlement for Payments
The intended change is about the strength and speed of settlement, not simply how quickly a transaction appears on a screen. A Solana payment can appear successful almost immediately under the current system, but Alpenglow is designed to provide a stronger assurance that the transaction is finalized and cannot be reversed. The target of about 150 milliseconds could reduce the time a merchant waits before accepting a payment or a blockchain bridge waits before releasing funds on another network.
That distinction matters to businesses and services that need confidence in a transaction before delivering goods or moving assets. If the upgrade reaches its target under real network conditions, those applications may be able to act sooner. The reported target does not, by itself, establish that every transaction will finalize at that speed, and the report does not provide measured post-upgrade performance.
There may also be a visible change in network statistics at activation. Because validator votes will no longer be recorded as on-chain transactions, Solana’s reported transaction count could fall sharply even if user trading and payments continue at a similar pace. A lower count around the switch would not, on its own, show that user activity had declined.
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From TowerBFT to Alpenglow
Solana has used TowerBFT since the network launched in 2020. The system’s on-chain vote transactions contribute to the network’s reported transaction totals. Alpenglow is intended to replace that voting approach by moving validator votes off-chain and using a certificate to confirm sufficient agreement on a block.
The scheduled date follows testing on a second public test network, as described in a separate CoinDesk report cited by the source material. The available information here does not provide detailed test results, so it does not establish how closely test performance matched the 150-millisecond target or what performance users should expect after activation. The Oct. 21 schedule is the concrete new development; the target speed remains a projected outcome.
““targeting transaction finality in about 150 milliseconds””
— CoinDesk report
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Performance and Operator Readiness
The timetable sets an expected start time, but the source material does not say whether the migration will proceed exactly as scheduled or describe any contingency plan if it is delayed. It also does not establish how quickly finality will occur across different network conditions once Alpenglow is active. The 150-millisecond figure remains a target, and actual results will need to be assessed after activation.
The report says Firedancer and Frankendancer operators will need to switch software temporarily because those clients do not support the initial migration. It does not give the number of affected validators, say how many have already prepared Agave 4.3.0, or detail how long those operators may remain on alternative software. The likely effect on transaction-count metrics is also a forecast, not a reported post-upgrade result.
blockchain transaction finality device
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The Epoch 1064 Rollout
The next milestone is the scheduled start of epoch 1064, expected around 15:00 UTC on Oct. 21. Solana is set to retain its current voting system for the first 5,000 slots, then move to Alpenglow roughly 18 minutes after the epoch begins. Validators’ software readiness and the network’s progress through those stages will determine how the rollout unfolds.
After the switch, the points to watch are whether the network finalizes blocks near the stated target, whether the migration proceeds without reported disruption, and how transaction counts change once vote transactions are no longer included on-chain. Those observations would help distinguish a change in measurement from a change in user activity. The source material does not specify a date for a formal performance report or additional post-activation milestones.
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Key Questions
When is Solana scheduled to activate Alpenglow?
The migration is scheduled for epoch 1064, expected to begin around 15:00 UTC on Oct. 21, 2026. Solana is expected to use its current voting system for the first 5,000 slots before switching to Alpenglow roughly 18 minutes after the start.
Does Alpenglow guarantee finality in 150 milliseconds?
No. About 150 milliseconds is the stated target. The report says actual performance will depend on network conditions, and it does not provide measured post-upgrade results.
What changes for validators?
Validators will exchange votes directly rather than recording them as on-chain transactions, with approvals combined into a certificate. Operators need software built on Agave 4.3.0; Firedancer and Frankendancer operators will need to switch software temporarily for the initial migration.
Could Solana’s transaction count fall after the upgrade?
It could. Validator votes currently count as transactions on the blockchain, and Alpenglow moves those votes off-chain. The report says the reported count may fall sharply even if user trading and payment activity stays at a similar pace.
Will validator fees change?
According to the report, voting charges of roughly 1 SOL per epoch will be replaced by a flat admission fee of 0.8 SOL. The report does not provide further details about how the fee will apply to individual operators.
Source: rss
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