Documents that
prove themselves.
A forged contract, certificate, or statement now costs $15 to make. Graven seals a cryptographic fingerprint of every file you issue into a public, immutable registry — so anyone can verify it's authentic in seconds, without trusting you or us.
Verification is free, public, and requires no account.
Generative AI broke the assumption that documents are hard to fake.
Detection tools guess whether a document looks fake. Graven flips the model: issuers seal documents at creation, so authenticity becomes a mathematical fact — not a judgment call.
Seal once. Verify anywhere, forever.
Three parties, one shared source of truth. The issuer signs, the holder carries the file, and any verifier checks it against a public registry — no one has to call anyone.
Seal
Upload a file — or hash it locally via the API. Its SHA-256 fingerprint is signed and recorded on a public, immutable registry. The file itself never has to leave your systems.
Sign
Optionally embed an invisible watermark and a signed C2PA Content Credential directly in the file, so even copies and screenshots stay traceable back to the original record.
Verify
Recipients drop the file on the public verify page, scan a QR, or check the live badge. They get a plain answer: authentic, revoked, or no record — with the proof one click away.
Change one bit, break the chain.
Every block carries its own fingerprint and the one before it. Alter a single byte in any record and its hash changes — which breaks every block downstream. The network sees the mismatch instantly.
↑ live simulation — editing one block's data rewrites its hash and orphans every block that points to it.
One platform, every layer of document trust.
Tamper evidence
A single changed bit fails verification. Recipients know the file is exactly what was issued.
Provenance & revocation
Every seal answers: who issued this, when, and is it still valid? Revocable seals can be cancelled; permanent ones never can.
C2PA Content Credentials
Sign files with the open provenance standard adopted by Adobe, Microsoft, and camera makers — bound to the registry record.
Invisible watermarking
A fingerprint embedded in the pixels or text itself, so re-saved and copied files still resolve to their original record.
Live verification badges
Embed a status badge next to any published document. If it's ever revoked, the badge updates — no page edits.
API-first
Seal and verify programmatically with scoped API keys. Integrate into issuance pipelines in an afternoon.
Why you can trust the answer
We never see your files
Only a one-way fingerprint is recorded. The document itself stays with you unless you explicitly opt into encrypted storage.
Proofs outlive us
Records live on a public registry. Even if Graven disappeared tomorrow, every proof would remain independently checkable.
Honest failure modes
We say what we can't prove. No AI guesswork, no confidence scores — a document is verified, revoked, or has no record.
Seal your first document in two minutes.
Free to try. No file ever leaves your control. Verification is public forever.