The Alpenglow upgrade is currently being trialed on the Solana testnet, bringing an impressive reduction in finality time from 12.8 seconds down to just 150 milliseconds. While this phase ensures that validators undergo thorough evaluation, it unfortunately leaves integrations unchecked. Consequently, any deposit flow or bridge that maintains a confirmation constant calibrated specifically for 32 slots operates on an underlying assumption that nobody has re-derived.

https://www.coindesk.com/tech/2026/09/23/solana-starts-testing-upgrade-that-could-cut-finality-from-12-8-seconds-to-150-milliseconds