Based OP primary sources — 2026-05-11

Official docs

• https://gattaca-com.github.io/based-op/
  • Intro page frames Based OP as a backwards-compatible Phase 1 based OP stack with a portal, gateway, and modified OP-node / execution-layer components.
• https://gattaca-com.github.io/based-op/overview/
  • Explains the phased path from centralized gateway to whitelisted gateways to permissionless gateways with slashing.
• https://gattaca-com.github.io/based-op/architecture/portal/
  • Shows the portal sidecar as the Engine API multiplexing layer that selects gateways, verifies payloads with a fallback EL, and preserves liveness.
• https://gattaca-com.github.io/based-op/architecture/gateway/
  • Details the gateway actor model, transaction sorting, simulator workers, frag broadcast flow, and state-machine logic.
• https://gattaca-com.github.io/based-op/scaling/
  • Explains the throughput thesis: continuous block building, frag-based early replay, partial-state RPC serving, and leader-aware propagation upgrades.

Repository / code surface

• https://github.com/gattaca-com/based-op
• https://raw.githubusercontent.com/gattaca-com/based-op/main/README.md
  • Useful for the concrete operator flow: starting a gateway, portal registration, follower-node setup, and modified wallet support for preconfirmations.

Design post

• https://ethresear.ch/t/becoming-based-a-path-towards-decentralised-sequencing/21733
  • Linked repeatedly from the docs as the higher-level design rationale for the gateway / decentralization path.