RAG answers 'what text is similar to this query?' It cannot prove the retrieved passage matches an authoritative document at capture time. In compliance, legal, and finance workflows, similarity is not enough — you need cryptographic proof of provenance.
Capture documents with POST /v1/extract to produce evidence bundles, verify them offline, then feed verified chunks into your vector store. Agents cite bundle IDs and Merkle proofs instead of unverifiable embedding matches.
Use DocImprint when decisions require auditable citations — contracts, filings, invoices, policies. Use RAG for exploratory search over already-verified corpora. High-stakes agents should capture proof first, then retrieve.
| Capability | Typical RAG | DocImprint |
|---|---|---|
| Semantic search | Yes | Via Collections |
| Tamper-evident capture | No | Yes (evidence bundles) |
| Offline verification | No | Free verify endpoint |
| Chain-of-custody | No | Legal hold + notarize |