The 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 Ethereum's Glamsterdam, Solana's Alpenglow, Base Beryl, and Avalanche Octane, as well as Bitcoin's OP_CAT / CTV covenant proposals and post-quantum discussions. Among them, Glamsterdam is expected to go live in the second half of the year, Solana Alpenglow aims to reduce finality time to around 100–150 milliseconds, and Base Beryl has shortened withdrawal finality from 7 days to 5 days. Bitcoin-related proposals still lack a clear activation path, making a major soft fork unlikely this year. (Cointelegraph)

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