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Glossary

To help with clarity and a common understanding, here are some helpful terms and their definitions.

General

  • Superchain Ecosystem member: A chain with an agreement in place to commit sequencer revenue back to the Optimism Collective.
  • Blockspace charter: A Blockspace Charter is a technical-focused governing document (and framework) for the Superchain.
  • Standard chain: A chain that conforms to the Standard Rollup Charter
  • Frontier chain: A non-standard chain that has modifications that do not fit the Standard Rollup Charter criteria.
  • Standard chain candidate: A chain that has met most of the standard chain criteria, except for the ProxyAdminOwner key handover.
  • Key handover: A colloquial term for updating the chain's ProxyAdminOwner to fulfill the requirements of the standard rollup charter.

Superchain Level and Rollup Stage

Chains in the superchain-registry are assigned a superchain_level (shown in individual config files as well as the chainList.toml/json summaries), depending on the set of validation checks that they pass.

Frontier chains have superchain_level = 0. These are members of the Superchain ecosystem.

Standard chains have superchain_level = 1. Because they satisfy a much stricter set of validation checks (see the Standard Rollup Blockspace Charter), they also qualify as Stage 1 rollups chains. These are full members of the Superchain.