Finality

Solana’s Alpenglow upgrade is scheduled to activate Wednesday, replacing the validator voting system the network has used since 2020. The change targets roughly 150-millisecond finality, lower validator costs and a transaction experience closer to centralized exchange speeds.

Solana has set Oct. 21 for the Alpenglow upgrade, a consensus change designed to make transactions irreversible in roughly 150 milliseconds under suitable network conditions. The migration will move validator voting off-chain, a shift that could reduce headline transaction counts even if user activity remains steady.

Ethereum’s Glamsterdam upgrade has lifted Sepolia’s processing allowance from about 60 million gas to nearly 200 million gas as developers test higher-capacity block design. Early sampled blocks used only 26% to 46% of the available allowance, while a short finality period showed strong testnet participation.

Solana’s Alpenglow upgrade is now active across both public testing environments, giving application teams more room to prepare before any live-network activation. The change targets about 150 milliseconds for settlement finality, but no mainnet launch date has been announced and the performance goal remains unproven under live-market conditions.

Ethereum developers have confirmed key testing dates for the Glamsterdam upgrade while warning that disposable builder identities could disrupt Sepolia block production. The issue does not threaten mainnet funds, but it could complicate infrastructure testing before the upgrade moves closer to Ethereum activation.