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Trust management systems often use registries to authenticate data, or formtrust decisions. Examples are revocation registries and trust status lists. Byintroducing distributed ledgers (DLs), it is also possible to createdecentralized registries. A verifier then queries a node of the respectiveledger, e.g., to retrieve trust status information during the verification of acredential. While this ensures trustworthy information, the process requiresthe verifier to be online and the ledger node available. Additionally, theconnection from the verifier to the registry poses a privacy issue, as it leaksinformation about the user's behavior.  In this paper, we resolve these issues by extending existing ledger APIs tosupport results that are trustworthy even in an offline setting. We do this byintroducing attestations of the ledger's state, issued by ledger nodes,aggregatable into a collective attestation by all nodes. This attestationenables a user to prove the provenance of DL-based data to an offline verifier.Our approach is generic. So once deployed it serves as a basis for any use casewith an offline verifier. We also provide an implementation for the Ethereumstack and evaluate it, demonstrating the practicability of our approach.

Offline-verifiable Data from Distributed Ledger-based Registries