Supported by Optimism Governance

The goal of this effort is to conduct a thorough investigation of cross-chain — and in particular cross-rollup — interoperability concerns.

Bluntly, one could equate interoperability with bridging: message-passing bridges, asset bridges, and atomic cross-chain transaction bundles.

This repository serves as a wiki for the research effort.

All pages are laid down flat in the pages directory so that they have a stable URL. Structure can be superimposed via index pages if required.

Project management is done via GitHub issues for now.

Everyone is welcome to contribute via pull requests, though it is recommended to get in touch (norswap [at] gmail) before investing signficant effort in any given direction.

• Direction — initial opinions & research direction
  • Lists key questions to be answered by the research.
• Sources & Brainstorming
  • Bridge List — a list of cross-chain bridges
  • Bridge Taxonomy List — a list of proposed taxonomies and properties for cross-chain bridges
  • Sequencing List — a list of projects and proposals for decentralized and shared sequencing
  • Bridging Model List — a list of bridging models (messaging formats & relaying)
  • Specialized Bridging List — a list of projects and proposals for specialized bridging
  • Bridge Research List — a list of investigation into innovative bridging solutions
  • DevEx List — a list of existing SDKs and modalities for cross-chain bridging -
  • Axiom List — a list of statements we consider to be true
  • Hypothesis List — a list of hypotheses we think might be true, but should strive to prove or disprove