PROVE IT EXISTED. FOREVER.

When your auditor asks you to prove an AI output existed at a specific moment, what do you show them?

THE PROBLEM

Article 14(4)(b) of the EU AI Act requires timestamped records of AI outputs. Most companies save files to a shared drive. When an auditor asks "prove this wasn't modified after review," they can't. The file could have been changed at any point.

THE SOLUTION

Upload any file. We compute its SHA-256 fingerprint and seal it into our immutable hash chain. We never see your document. We only seal its cryptographic fingerprint. The seal includes a permanent timestamp, a chain link to every previous attestation, and a public verification URL.

THE TAMPER CHALLENGE

Click any block to alter it. Try to break the chain without getting caught.

CHAIN INTACT

All records verified.

Each block is locked to the one before it. Change any record, and every block after it breaks instantly. This is how we prove your files were not altered.

Tamper attempts: 0

TIMESTAMP

Permanent, to the second. When your auditor asks when, you have the answer.

CHAIN

Every seal links to the previous one. Insert, reorder, or backdate and the chain breaks. Tamper-evident by design.

AUTHORITY

If you have completed the free operator assessment, your seal includes your operator tier. Not just "this file existed" but "this file existed AND the person responsible was independently assessed."

Traditional notarization: €25 per seal

Seal only. No cryptographic chain. No public verification. Physical visit required.

WIPO timestamping: €20 per token

Timestamp only. No authority verifying the subject. No public verification. No chain.

AuditProof attestation: EUR 25 for 3 files

Cryptographic chain. Timestamp. Authority. Public verification. No subscription. No account. Runs entirely in your browser.

Includes timestamp, chain, authority, and public verification. No subscription. No account needed.

3 FILES (INTRO OFFER)

€25

I understand this is an automated software diagnostic, not legal advice or a compliance certification. TermsSeal Your File - €25

10 FILES

TEN FILE BUNDLE

€100

Ten files, sealed individually. Each gets its own SHA-256 fingerprint, its own chain link, and its own public verification URL. Built for ongoing compliance, when one seal isn't enough. Same guarantee: we never see your documents, only their cryptographic fingerprints.

I understand this is an automated software diagnostic, not legal advice or a compliance certification. TermsBuy Bundle - €100

Complete the free operator assessment to seal files under your operator authority. Your seal will include your assessed tier.

TAKE THE FREE ASSESSMENT

This will be entry #1 in the AuditProof Attestation Chain.

Audit a Public Company