SOLANA UPGRADE THAT COULD CUT FINALITY FROM 12.8S TO 150MS

Summary from the TLDR Crypto newsletter

Solana's Alpenglow upgrade has moved to public testnet, replacing TowerBFT with a new consensus protocol called Votor that reduces transaction finality from 12.8 seconds to 150 milliseconds. Votor replaces on-chain vote accumulation across 32 slots with direct validator-to-validator messaging that settles in one or two rounds, requiring no changes to wallets or user-facing transaction flows. The rollout requires Agave 4.3 validator software, while Firedancer and Frankendancer clients do not yet support the upgrade, and a tentative mainnet date of September 28 has not been confirmed. The finality reduction would cut the hold periods exchanges impose before crediting deposits, the wait bridges require before releasing cross-chain funds, and the confirmation delays merchants currently face.