Overview

• Optimism and Flashbots announced a formal partnership to integrate Flashbots’ sequencing infrastructure across the OP Stack Superchain.
• Flashblocks are already live on Base and Unichain with confirmations reported as fast as 200 milliseconds, with Optimism mainnet and other chains slated to follow in the coming months.
• Builders will gain configurable features such as programmable block building, verifiable ordering using secure enclaves, responsible MEV capture, and enhanced spam resistance.
• Unichain and World Chain are testing verifiable transaction ordering and priority blockspace as part of the advanced sequencing options.
• Optimism says the Superchain accounts for over 60% of Ethereum layer‑2 activity and that Flashbots’ tooling builds a large share of Ethereum blocks, framing the potential reach of the rollout.