alpenglow

Solana ecosystem R&D company Anza announced that the Alpenglow mainnet test version will be activated on October 21, 2026, at 14:50 (UTC). After the upgrade is completed, transaction finality is expected to shorten from approximately 12.8 seconds to 150 milliseconds.Alpenglow will replace the existing TowerBFT voting mechanism with Votor, allowing validators to not write every vote to the chain but instead confirm consensus through direct communication and summarizing into smaller records. The network is expected to maintain the existing system for about 18 minutes, switching to Votor after staking SOL reaches 82% of the validator set. Another component of Alpenglow, Rotor, will adjust the distribution method of new blocks among validators, but the activation date has not yet been announced. This upgrade only includes Votor, and Solana will temporarily focus on the replacement of the consensus mechanism.

According to CoinDesk, Solana plans to implement the Alpenglow upgrade on October 21. This upgrade aims to reduce the transaction finality time to about 150 milliseconds and replace the existing voting system of the network with a faster certificate-based consensus mechanism.

According to The Defiant, the Solana development team Anza has scheduled the migration of Alpenglow's mainnet Beta for approximately 10:50 AM Eastern Time on October 21 (Wednesday), at which point the new consensus system will replace TowerBFT, aiming to reduce the final confirmation time for transactions to about 150 milliseconds. The Solana Foundation's upgrade guide indicates that the final confirmation time under TowerBFT is about 12.8 seconds. Final confirmation refers to the point in time when a transaction can no longer be rolled back, rather than the block interval.Alpenglow's Votor voting protocol no longer submits votes as on-chain transactions; instead, messages are sent directly between validators and aggregated into certificates, allowing blocks to be finally confirmed after one to two rounds of voting. The removal of voting transactions from blocks also frees up block space for users, while the execution and fees for user transactions remain unchanged. This upgrade had previously completed the migration of the testnet and development network in September, and the mainnet functionality switch has not yet been activated. According to Anza's activation policy, the new version of the software must be adopted by 95% of the staked amount for two epochs before it can be activated on the mainnet.The migration plan separates the activation of the functionality switch from the handover itself: the functionality switch is activated at the epoch boundary, and after 5,000 slots, blocks will pause carrying user transactions and will only contain votes. Validators will then establish the Alpenglow genesis certificate supported by 82% of the staked amount, roll back blocks containing only votes, and then restore user transactions with Votor. Anza expects the handover to take several hundred milliseconds.

Solana posted on platform X that it has gradually reduced the target Slot Time from 400 ms to 250 ms, during which the network's block skipping rate remained stable, and the downtime caused by continuous block skipping has also been shortened.However, the shorter Slot Time has led to an increase in voting delays, with nodes in Asia and South America being the most affected. Therefore, further reducing it to 200 ms before the launch of Alpenglow still requires caution.

Solana co-founder Anatoly Yakovenko stated that the industry is "not ready" for the next major upgrade of the chain, Alpenglow.Previously, Anza engineers had migrated the Solana developer network to the Alpenglow consensus protocol, which will change the way blocks are processed, aiming to reduce the transaction finality time from about 12.8 seconds to 100 to 150 milliseconds.

According to CoinDesk, the Solana consensus upgrade Alpenglow has completed the switch to Testnet and Devnet on September 24 and 25, respectively, and is currently running on the two major public test networks, allowing application teams to test compatibility before launching on the mainnet. Alpenglow aims to reduce the final confirmation time from about 12.8 seconds to approximately 150 milliseconds by allowing validators to exchange votes directly instead of writing votes as transactions into blocks, enabling consensus to be reached within one to two rounds of voting.The Solana Foundation reminds that the transaction statistics containing validator votes may decrease after the upgrade, but user payments and transaction volume may not necessarily decline; applications that simply send transactions and read account balances do not need to migrate. The 150 milliseconds is a simulated target and has not yet been validated in a real mainnet environment, and wallet processing and exchange deposit confirmations may still increase waiting times. The exact date for the mainnet launch has not yet been announced.

The Solana core consensus upgrade Alpenglow has officially entered the second public test network, and the transaction settlement delay is expected to be reduced from approximately 13 seconds to 150 milliseconds.

The Alpenglow upgrade of the blockchain network Solana has entered the public testnet, where developers will test reducing transaction finality from about 13 seconds to 0.15 seconds, or 150 milliseconds. This upgrade will replace Solana's existing TowerBFT consensus system with Votor, allowing validators to confirm blocks through one to two rounds of direct voting, but the way users send funds will not change.The first testnet migration requires using Agave 4.3 and does not currently support Firedancer or Frankendancer. The mainnet update on September 28 is still a tentative arrangement and not a confirmed launch date for Alpenglow.

According to SolanaFloor, Jump Crypto's Firedancer team will stop supporting the Solana transitional validator client Frankendancer after Alpenglow is activated on the Solana mainnet, with the upgrade expected to go live in October with v4.3.The team stated that the decision was made due to the maintenance and security burden, and they will subsequently focus resources on the complete Firedancer client.

Solana's official disclosure data shows that the transaction volume in August reached 5 billion, surpassing the total transactions of all other blockchain networks, equivalent to processing over 100,000 transactions per minute, while maintaining transaction fees far lower than other public chains.In addition, the Alpenglow upgrade, aimed at significantly improving network confirmation speed, is expected to launch in October this year, promising to reduce transaction confirmation time from about 12 seconds to 400 milliseconds.

According to CryptoSlate, researchers from USENIX Security have publicly disclosed a clock attack vulnerability targeting Solana's Proof of History (PoH) mechanism, which was privately reported to the Solana development team back in December 2025. The research shows that a malicious scheduler leader can manipulate the PoH logical clock by "re-anchoring," slowing down the advancement of logical time, thus gaining a longer transaction selection window in physical time, and isolating honest leader blocks using the TowerBFT fork choice mechanism, with the required staking ratio for the attacker being less than 33%.The Alpenglow security competition with a reward of 50,000 SOL under Anza concluded on August 19, but the vulnerability was excluded from the review scope due to the competition rules that state "actions that can only be triggered when Alpenglow is not activated." The Solana development team stated that they are aware of the related behavior, believe that the probability of the most severe scenario occurring under current conditions is low, and expect that the Alpenglow upgrade will fundamentally eliminate the prerequisites for the attack. Currently, the Alpenglow code has been included in the Agave 4.2 client but has not yet been activated on the mainnet, and is expected to go live with Agave 4.3. Until then, the transitional risk of this vulnerability has not been publicly analyzed or addressed at the implementation level.

According to CoinDesk, the Solana core development team Anza announced that a major consensus mechanism upgrade codenamed Alpenglow has gone live on the community test network, allowing validators to switch from the current Proof-of-Stake + Proof-of-History + TowerBFT architecture to the new consensus framework in the test cluster.The upgrade aims to significantly shorten transaction finality time and improve network response efficiency by restructuring the validator communication and block confirmation process. This test marks that validators can now perform the "Alpenswitch" migration operation in a real environment. Solana co-founder Anatoly Yakovenko previously stated that if the testing goes smoothly, Alpenglow is expected to be deployed to the mainnet as early as next quarter.

According to CoinDesk, Solana co-founder Anatoly Yakovenko stated at Consensus Miami 2026 that the major upgrade of the Solana network, "Alpenglow," is expected to be launched this year, possibly as early as next quarter.Yakovenko said that the Alpenglow upgrade aims to bring transaction confirmation speeds close to the physical limit of "light speed," enhancing the network's speed, reliability, and transaction certainty, shifting from Solana's early innovations to a more mature phase focused on performance guarantees and reliability. This is crucial for time-sensitive applications such as financial applications.

Delphi Digital posted on platform X that Solana is preparing for a major upgrade called Alpenglow. This upgrade is a complete overhaul of the consensus mechanism, aiming to achieve sub-second finality by replacing Tower BFT and Proof of History (PoH).Alpenglow introduces two new protocol components: Votor and Rotor. Votor replaces the incremental voting rounds of Tower BFT with a lightweight voting aggregation model. Validators can aggregate votes off-chain before submitting the final confirmation, allowing blocks to achieve finality within 1 to 2 confirmation rounds. This improvement reduces the theoretical finality delay to 100 to 150 milliseconds, shortening it by about 100 times from the original 12.8 seconds.Votor achieves finality through two parallel paths: when a proposed block receives over 80% of the total staked weight in the first round, it triggers fast confirmation and takes effect immediately; if the support rate is between 60% and 80% in the first round, it triggers slow confirmation, requiring a second round of voting to exceed 60% for final confirmation.Rotor reconfigures Solana's block propagation layer. The original Turbine propagation network relied on multi-hop relays with variable delays, while Rotor introduces a staked-weight relay path that prioritizes bandwidth efficiency. Validators with high stakes and reliable bandwidth will become core relay points. Simulation data shows that under typical bandwidth conditions, block propagation can be completed in as fast as 18 milliseconds. This upgrade is expected to be rolled out gradually, with an initial launch timeframe anticipated between early to mid-2026.

ChainCatcher news, according to CoinDesk, Marinade Labs CEO Michael Repetny stated that the Solana ecosystem is preparing for an upgrade by the end of this year or early 2026, with future plans to lower the validator entry threshold after the Alpenglow upgrade, while increasing bandwidth and reducing latency.

ChainCatcher news, the Solana new consensus protocol Alpenglow proposal SIMD-0326 has been voted through. The voting rule requires that the proportion of affirmative votes must reach 2/3 of the total votes (affirmative + negative) to pass.Alpenglow aims to reduce the block finalization time from 12.8 s to nearly 150 ms.

ChainCatcher news, Solana's new consensus protocol Alpenglow proposal SIMD-0326 has entered the community governance phase. Alpenglow aims to reduce the block finalization time from 12.8s to nearly 150ms. The proposal will enter the voting phase during Epochs 840~420 (currently at 834, with one Epoch being approximately 2 days). The voting rule is that the proportion of affirmative votes must reach 2/3 of the total votes (affirmative + negative) to pass.