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Solana’s Alpenglow, its biggest network overhaul since 2020, goes live Wednesday
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Solana’s Alpenglow upgrade, the network’s largest overhaul since 2020, is scheduled to activate on Wednesday, replacing its validator voting system. The change is designed to cut transaction finality from about six seconds to roughly 150 milliseconds. If the target holds on mainnet, Solana payments and trades could lock in faster than a blink.
The upgrade alters how validators agree on valid transactions. Instead of writing every vote onto the blockchain, Alpenglow moves voting off-chain and bundles votes into certificates. Those certificates can finalize a transaction in one or two rounds.
The speedup matters for trading and payments. Six-second finality is slow in fast markets because prices can move before a trade settles. A 150-millisecond target would bring Solana closer to centralized exchanges and card payments; Ethereum, by comparison, takes about 13 minutes for full finality.
Validator economics also change. Validators currently spend about 2 SOL a day on vote fees, a cost that doubled after Solana reduced slot times to roughly 200 milliseconds. Alpenglow eliminates those fees in favor of a 0.8 SOL per-epoch admission ticket, about 60% cheaper.
The rollout followed a difficult testing period. The test network was restarted six times since early May, and one migration failed network-wide and had to be rolled back. A later migration succeeded, clearing the path to mainnet.
Robin Nordnes, CEO of Raiku, said Solana’s transaction count will look much lower this week because validator votes are now off-chain. "The trading’s all still there," he said, noting for trading desks faster finality is useful but proximity to block building remains the real bottleneck.
Activation is set for the start of epoch 1064 on Wednesday, at slot 459,653,000 after a 5,000-slot transition. The failed test migration posed no risk to real funds because it occurred on a test network built for such failures. The upgrade replaces the voting system Solana has used since 2020.
