The Solana Foundation and software developer Anza scheduled the Alpenglow mainnet upgrade for October 21, 2026, targeted for epoch 1064 at approximately 15:00 UTC

How changes to Bitcoin's rules get proposed, fought over and adopted, from improvement proposals and soft forks to upgrade debates like quantum resistance.

Mainnet debuts, major upgrades, and ecosystem milestones that mark when networks ship, from genesis blocks to landmark hard forks.