You'd reach for this when you need to verify documents without exposing their contents, using blockchain anchoring for tamper-proof records. The server likely handles document hash generation, ledger writes for verification timestamps, and retrieval operations to prove a document existed at a specific point in time. It's built for scenarios where you need cryptographic proof of document authenticity without centralized trust, like compliance workflows, IP protection, or audit trails. The privacy-first angle means the actual document data stays off-chain while verification happens publicly. Useful if you're building verification into workflows where traditional notarization is too slow or you need programmatic access to proof-of-existence.