Key blockchain upgrades in the second half of 2026 will focus on protocol performance, reliability, and institutional-grade infrastructure. The article lists upgrades related to the Ethereum network (Glamsterdam), Solana (Alpenglow), Base (Beryl), Avalanche (Octane), as well as Bitcoin proposals like OP_CAT / CTV covenants and discussions on quantum resistance. Among them, Glamsterdam is expected to go live in the second half of the year, Solana Alpenglow aims to reduce final confirmation time to around 100–150 milliseconds, and Base Beryl has shortened withdrawal finalization time from 7 days to 5 days. Bitcoin-related proposals still lack a clear activation path, and the likelihood of a major soft fork this year remains low. (Cointelegraph) https://(wublock123.com)/news/2026-blockchain-upgrades-protocol-performance-institutional-infrastructure-63982