Solana switches to Alpenglow today, October 21. It is the network's biggest upgrade since 2020 and replaces the validator voting system. Final confirmation of a transaction should drop from about six seconds to 150 milliseconds, CoinDesk reports.
What goes live today
The switch happens at the start of epoch 1064. The change itself activates at slot 459,653,000 after a transition period of 5,000 slots. The upgrade alters how validators, the computers that process transactions and vote on their validity, reach agreement with each other.
Today every validator writes its vote straight onto the blockchain like an ordinary transaction. A payment becomes final only once enough votes pile up, which takes about six seconds. For comparison, Ethereum needs roughly 13 minutes to reach full finality.
Voting moves off the chain
Alpenglow takes voting off-chain. Votes are bundled into certificates that lock in a transaction within one or two rounds. That is a speedup of about 40 times.
There is a side effect for statistics. Validator votes used to count as transactions, and now they will not appear on the blockchain. The network's transaction counter will look much lower, although trading itself does not go anywhere.
"Solana's transaction count is going to look a lot lower this week, and people will ask if something's wrong. It isn't. Most of what got counted before was validators voting, and that's off-chain now. The trading's all still there."
Robin Nordnes, CEO and founder of Raiku, in an email comment
Cheaper for validators, but a bumpy road
Validators currently burn about 2 SOL a day on vote fees. That cost doubled after Solana cut its slot time to roughly 200 milliseconds. Alpenglow scraps those fees and introduces a flat entry charge, the validator admission ticket, set at 0.8 SOL per epoch (about a day). Costs fall by roughly 60%.
Since early May the test network was wiped and restarted from scratch six times. One migration attempt failed network-wide and had to be rolled back, according to a post from Galaxy Digital, one of about 100 validator operators on the testnet. A later migration succeeded and cleared the way for launch.
No real money was at risk, since every failure happened on a network built for exactly that kind of breakage.
What traders and payment services get
Six seconds is a long time in a fast market. A price can move before a trade is locked in, and exchanges and payment apps make users wait before crediting a deposit. Cut to a fraction of a second, Solana gets close to paying by card or trading on a centralized exchange.
- Payment confirmation: about 150 milliseconds instead of six seconds.
- Validator fees: a flat 0.8 SOL per epoch instead of roughly 2 SOL a day.
- Transaction counter: lower, because votes are no longer written to the blockchain.
Not everyone sees speed as the main point. Nordnes said faster finality is nice for trading desks but was never the bottleneck. Being close to where the block is built still matters more.
The first hours will show real numbers
Everything now depends on how the network behaves under live load. The 150 millisecond target has so far been measured only on the test network. The first data will arrive right after the switch at slot 459,653,000.
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