How to certify your internal documents before archiving or audit

The date of an internal document is often impossible to prove after the fact

During an external audit or tax inspection, a company must prove that an internal report or meeting minutes were established before a specific date — but no system allows independent certification. A labor dispute pits the company against a former employee over the date a HR document was created. Without timestamped technical proof, the company's word alone is not enough. Existing cloud solutions require uploading often confidential documents to foreign servers — a real GDPR compliance issue.

Document integrity proof, without compromising confidentiality

I need to archive meeting minutes, an audit report or a sensitive HR document.

I generate a timestamped proof before archiving or sending. The SHA-256 hash is calculated locally and timestamped by a third-party authority using the RFC 3161 standard.

I can prove that this document existed at this precise date, verifiable by any third party.

The document never leaves the device. Zero upload, zero GDPR exposure.

Accepted formats: PDF, Word, Excel, ZIP, images — all document formats

3 steps, 30 seconds per document

1. Drop your document: Meeting minutes, report, contract, audit, HR file… drag and drop in your browser.
2. Automatic local certification: SHA-256 hash calculated in your browser + RFC 3161 timestamp via a trusted third-party authority.
3. Download your Proof Pack: Readable PDF certificate + archivable .tsr token, independently verifiable.

A solution designed for team needs

• Enterprise templates — Logo, entity, mandatory custom fields on each certificate.
• Naming policies — Configurable naming conventions and local retention.
• Packaged deployment — Signed bundle deployable internally, no external dependency.
• TSA authority choice — Dedicated timestamp authority configuration per your requirements.
• Priority support + invoicing — Enterprise invoices, dedicated support and custom SLA.
• Dedicated onboarding — Personalized support for deployment in your organization.

ProofStamper vs classic cloud solutions for enterprises

Two approaches, only one preserves your confidentiality

All your sensitive documents, certified before archiving

• Meeting minutes — Certify the date of minutes before distribution to partners.
• Audit reports — Prove a report existed before a regulatory deadline.
• Supplier contracts — Timestamp signed versions before archiving.
• HR documents — Pay slips, amendments, annual reviews certified.
• Financial reports — Balance sheets, income statements, forecasts dated.
• Internal policies — Internal regulations, IT charters, quality procedures.

Frequently asked questions

Is this proof GDPR compliant?

Yes. ProofStamper does not collect, store or transmit any document. Only the cryptographic hash (SHA-256) — a unique identifier that cannot reconstruct the document — is sent to the timestamp authority. Your sensitive data never leaves the device.

Are our documents sent to your servers?

No, never. All processing happens locally in the user's browser. No file, no content is transmitted to ProofStamper or any third party. This is the fundamental guarantee of our local-first approach.

What's the difference with a qualified eIDAS electronic signature?

A qualified electronic signature (eIDAS) legally binds a signer to a document's content. ProofStamper's RFC 3161 timestamp proves a file existed at a given date, without modifying it. Both are complementary: timestamp first to prove anteriority, sign afterwards if needed.

Can we deploy ProofStamper across our entire team?

Yes. The Business plan includes packaged deployment (signed bundle), enterprise templates with logo and mandatory fields, naming policies, and dedicated onboarding for your organization.

Do you issue invoices for businesses?

Yes. The Business plan includes compliant enterprise invoicing, priority support and a dedicated contact. Contact us for a custom quote.