Introduction

We're excited to present a reference implementation of a Phase 1 based OP stack. The implementation is fully backwards compatible, and overlays the current stack with high performance components to unlock fast execution preconfs and improve scalability.

The key components are:

• a Portal, upgrading existing sequencers with external block production
• a Gateway, a new sequencing entity that provides execution preconfs to the rollup on behalf of L1 proposers
• upgraded OP node and EL changes, including an extended P2P network, that enable nodes to pipeline block processing and serve preconfs before the block time has fully elapsed. We have made the necessary adaptations to op-node and op-geth as these are the most common clients, and will add the EL changes to reth soon.

Designed by Gattaca and developed in collaboration with Lambda Class, this implementation provides a reference for future development that we hope will help bootstrap based rollups and high-performance gateway solutions.