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Arbitrum Nitro with Celestia DA

Arbitrum Nitro with Celestia DA

Overview

The Arbitrum Nitro integration with Celestia enables Orbit chains to use Celestia for data availability instead of Arbitrum AnyTrust. The implementation uses a sidecar architecture where a separate celestia-server handles Celestia-specific operations via RPC.

How it works

Nitro's batch poster coordinates with the Celestia DAS server to store batch data:

  1. Batch posting: The MaybePostSequencerBatch method checks if a DAS writer is configured and acquires a lock before posting
  2. Data storage: The DAS writer calls the Celestia server's Store method, which:
    • Creates a blob from the batch data
    • Submits it to Celestia with retry logic and gas price adjustment
    • Returns a BlobPointer containing block height, share indices, and data commitments
  3. Verification: During disputes, Blobstream (default: SP1 Blobstream) confirms batch availability on Celestia, supporting fraud proofs through the hash oracle trick

Key features

  • Sidecar architecture: Processing logic handled by separate celestia-server, keeping Nitro nodes lightweight
  • Fallback support: Native fallback mechanism with configurable da-preference parameter (e.g., ["celestia", "anytrust"])
  • Preimage oracle: Validators populate preimage mappings with Celestia hashes for fraud proof support
  • Robust submission: Automatic retry with gas price adjustment for network congestion

Resources