L2 Demo Day June 16, 2023

Rollup-Boost
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Another week, another set of amazing demos! :zap::zap::zap::zap:

Let us know if any of these advancements resonate with you!

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In this weeks demo I’ll explain how the Flashblocks RPC overlay enables serving Flashblocks preconfirmed execution data using existing RPC endpoints by modifying the behavior of pending tags in reth and a few more endpoints. This lays the groundwork for exposing Flashblocks via standard Ethereum interfaces without altering RPC clients.

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In this quick demo, I walk through two recent engineering improvements:

  • First, I’ve added structured telemetry and detailed tracing spans for Flashblocks, making it easier to introspect builder activity, debug timing issues, and monitor payload construction in real time.

  • Second, I integrated a custom engine-API layer into the builder, which allows for more flexible control over payload handling, including conditional payload returns.

These updates were particularly useful for debugging and tuning the new dynamic Flashblock timing logic, where the number of Flashblocks emitted per slot is now adjusted based on how early or late we start building within the slot.

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In this session, I walk through recent engineering work on op-rbuilder:

  • Testability: We’ve overhauled the test infrastructure in op-rbuilder to improve reliability and speed up development. Using the new rb_test macro, we auto-generate tests across multiple builder variants. Logs from reth and op-rbuilder can now also be surfaced during test runs, making debugging easier. .

  • Builder SDK: Our new modular Builder SDK proposal makes it easier to build and customize block builders. I explain how the new pipeline and state APIs work, and show how they help us build more flexible and reliable builders.

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In this demo, I walk through recent additions to Contender, including new subcommands under the spam command for executing targeted stress scenarios on a reth devnet.

I’ll walk through gas patterns, block time stability, and inclusion delays under varying load with new interactive charts in the Contenter report.

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In this demo, I walk through how op-rbuilder integrates Flashtestations to register a builder running inside a TDX VM. I covers key generation, attestation quote submission, and onchain registration using a debug environment on Unichain Sepolia.