Solana News: Alpenglow Activates Oct. 21, Targeting 150-Millisecond Finality

• Solana is set to activate Alpenglow on Wednesday, October 21, at the start of epoch 1064.

• It’s the network’s largest consensus change since mainnet launched in 2020.

• The target is full transaction finality in about 150 milliseconds, down from roughly 6.4 seconds.

• Consensus hands over about 18 minutes later, at slot 459,653,000.

• Validators pay a 0.8 SOL admission ticket per epoch instead of per-vote fees, about 60% below current gross voting costs.

• Firedancer and Frankendancer aren’t supported for the switch.

Solana is set to activate Alpenglow on Wednesday, October 21. It’s the network’s largest consensus change since mainnet launched in 2020, and it targets full transaction finality of about 150 milliseconds.

The feature turns on at the start of epoch 1064. This Solana news follows the final slot-time cut to 200 milliseconds on October 9.

Follow Solana news every day. Join SpotX Signals on Telegram for real-time crypto market alerts.

Solana News: Alpenglow Activation at a Glance

Key details:

• Date: Wednesday, October 21

• Start: epoch 1064

• Consensus handover: about 18 minutes later, at slot 459,653,000

• Finality target: about 150 milliseconds (about 6.4 seconds now)

• Estimated epoch 1064 start: around 13:20 UTC (Solana Foundation) or around 14:50 UTC (Anza)

• Validator ticket: 0.8 SOL per epoch, burned in full

• Supported validator clients: Agave, Jito-Solana and Harmonic Salsa

Readers who follow Solana news and network activity in real time can do so through the SpotX live stream.

Main News: A New Consensus System Goes Live

Under TowerBFT, the system Solana has run since 2020, validators vote by submitting transactions to the chain. A block becomes final once enough of those votes accumulate over 32 slots.

Alpenglow’s first phase, called Votor, has validators exchange votes directly and aggregate them into BLS certificates. Proof of History stops pacing block production once the migration completes.

• One round: a block finalizes if 80% of stake votes for it

• Two rounds: otherwise a second round at 60% thresholds applies

Finality: From 6.4 Seconds to a 150 ms Target

Recent slot-time cuts already halved the wait for full finality, from 12.8 seconds to about 6.4 seconds. The 150-millisecond target would cut that by a further factor of about 40.

The Solana Foundation describes 150 milliseconds as an expectation rather than a constant. It varies with stake distribution and with whether a block clears in one round or two. It hasn’t yet been measured on mainnet.

Votes Move Off the Chain

According to Galaxy Digital, vote transactions have made up roughly three quarters of everything the network processes. Under Alpenglow, those votes no longer appear as transactions in blocks.

Traders who monitor Solana network activity and validator data can follow live data through SpotX.

Validator Costs

Under TowerBFT, validators pay a fee on every vote, once per slot. The cut to 200-millisecond slots, completed on October 9, roughly doubled that bill per day to about 2 SOL.

• New system: a validator admission ticket of 0.8 SOL per epoch, about 24 hours at current slot times

• Charged to: the vote account, and burned in full

• Compared with current costs: about 60% below gross voting costs

• Block leader income: half of each vote fee previously went to the block leader

Fault Tolerance

Alpenglow is built to keep running with up to 20% of stake acting maliciously plus a further 20% offline. That’s a 40% combined budget, against 33% under TowerBFT. The share that can be actively hostile falls from 33% to 20%.

Slashing for double-voting is defined but isn’t switched on in this first iteration.

Testing History

• Community test cluster: launched in early May with about 50 operators and has grown to roughly 100 validators

• Galaxy Digital: joined in June

• Restarts: the cluster has been wiped and restarted six times

• Failed attempt: one migration attempt failed network-wide and was rolled back before a later attempt succeeded

• Funds at risk: none, since it was a test cluster

• Testnet and devnet: Alpenglow activated on testnet on September 24 and on devnet the next day

Validator Software and What Comes Next

During the migration, validators must run an Agave-based client: Agave, Jito-Solana or Harmonic Salsa. Firedancer and Frankendancer are not supported for the switch.

The network will confirm the handover through a new RPC call that returns Alpenglow’s genesis certificate. Epoch timing drifts with slot speed.

Rotor, a second phase that replaces Turbine’s block propagation with a single relay layer, is planned for a later release and isn’t yet scheduled.

Solana Market Snapshot

Binance’s ticker on the page shows SOL up 2.49% and ETH up 3.13%.

Summary: Solana News Today

Solana is set to activate Alpenglow on October 21, its largest consensus change since 2020, targeting about 150-millisecond finality.

• Activation: epoch 1064, with consensus handover about 18 minutes later

• Finality: target of about 150 ms, from about 6.4 seconds

• Votes: exchanged directly and aggregated into BLS certificates

• Fees: a 0.8 SOL per epoch admission ticket replaces per-vote fees

• Clients: Agave-based clients only for the migration

Never miss Solana news. Get real-time crypto alerts on SpotX Signals on Telegram.