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Satellite functionality is split across modules that are combined through the ISatellite interface.

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MMR and block commitment modules

  • MmrCoreModule: manages MMR creation, root/size history, parent hash storage, and MMR queries.
  • EvmOnChainGrowingModule: appends EVM header batches directly on-chain.
  • EvmSharpMmrGrowingModule: updates MMR state from SHARP-proven job outputs.
  • StarknetSharpMmrGrowingModule: Starknet-oriented SHARP growth module surface.

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Proof and fact registry modules

  • EvmFactRegistryModule: verifies and stores EVM header/account/storage/timestamp facts.
  • CairoFactRegistryModule: tracks Cairo facts (verified and mocked modes are both represented).

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Parent hash fetch modules

  • Native fetcher: pulls recent parent hashes from the local chain context.
  • Network-specific fetchers: modules for Starknet, Arbitrum, and Optimism-specific flows.
These modules provide authenticated continuity points used by growth processes.

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Messaging modules

  • Sender side: universal sender plus network-specific senders (for example L1->Starknet, L1->Optimism, L1->Arbitrum, L1->ZkSync, Arbitrum->ApeChain).
  • Receiver side: receiver modules validate the cross-domain source and ingest incoming parent hashes/MMRs/facts.
  • Registry: SatelliteRegistryModule stores known satellites and connection metadata.

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Data Processor module

  • DataProcessorModule: stores HDP task status/results and authenticates task completion by checking authorized program hashes and valid Cairo facts against MMR roots used by the task.

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Governance and maintenance modules

  • Ownership/admin controls: owner and admin management.
  • Inspector module: module/function selector introspection.
  • Maintenance module: add/replace/remove module selectors (diamond maintenance operations).

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Practical interpretation

For most integrators, the key interaction is with proof/read surfaces (EvmFactRegistryModule + read helpers). For protocol operators, growth/messaging/maintenance modules are what keep commitments fresh and synchronized across chains.