Optimism Upgrade 17 Strengthens Superchain Security
December 2, 2025 – The Optimism Upgrade 17 has been deployed across its L2 mainnet, delivering the most significant stability and congestion resistance improvements in Superchain history. The upgrade introduces protocol level controls for data availability, refined fee-market mechanics, and hardened fault-proof security. Key Takeaways Optimism deploys Upgrade 17 on L2 mainnet, improving congestion resistance …
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