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External Block Building

Much like mev-boost on Ethereum layer 1, rollup-boost is a sidecar that runs alongside the sequencer in Optimism chains to source blocks from external block builders. Unlike mev-boost, there are no code changes or extra config to support external block building in the consensus node as rollup-boost reuses the existing Engine API to source external blocks.

architecture

Instead of pointing to the local execution client, the rollup operator simply needs to point the consensus node to rollup-boost and configure rollup-boost to connect to both the local execution client and the external block builder.

To read more about the design, check out the design doc for how rollup-boost integrates into the Optimism stack.