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  1. Captive Core – Invokes the stellar-core binary as a subprocess which connects to the live Stellar network and fetches network data (i.e., ledgers).
  2. BufferedStorageBackend – Retrieves ledger metadata from cloud storage.
  3. RPCLedgerBackend – Retrieves ledger metadata from an RPC server.
Each backend has its own setup and configuration requirements, which are covered in the following sections.

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LedgerCloseMeta Structure

xdr.LedgerCloseMeta captures a detailed record of all state changes during the closing of a Stellar ledger. It includes:
  • LedgerHeader – Metadata about the ledger, including:
    • Ledger sequence number
    • Previous ledger hash
    • Close time
    • Bucketlist hash
  • TxSet – The set of transactions included in the ledger.
  • TxProcessing – Execution results of each transaction, including:
    • Success or failure of operations within transactions
    • OperationMeta, which tracks LedgerEntryChanges caused by transactions
  • UpgradesProcessing – Any protocol upgrades applied in this ledger.
  • ScpInfo – Details of the consensus process that finalized this ledger.
  • EvictedLedgerKeys – Keys of ledger entries removed due to expiration.