People
Protect your photos and documents in seconds.
Choose the file and get the certificate and the proof, ready to show whoever needs to see it. Nothing to install.
Trust needs proof.
Certify the date and integrity of your files.
Create verifiable proof of any document, image or file.
With optional custody and a qualified eIDAS timestamp (RFC 3161), recognised across the EU.
- PDF certificate, ready to share
Your digital proof, easy to understand for whoever receives it. It comes with a ZIP holding your exact file and the data to check it. If the image carries Content Credentials (C2PA), the certificate records them.
- Independent verification
With standard tools and public references we do not control.
- Your file stays on your device
With your account, Sellat Local computes the fingerprint right there and the file is never uploaded.
- Qualified seal and custody, if you need them
Legal presumption of date and integrity across the EU, under Regulation (EU) 910/2014. And, if you want, your original kept encrypted in the EU.
For every need
One proof. Three ways to use it.
Protect a file, keep a record of what happens in your business, or give your AI agents proof of what they do.
Businesses
Prove what existed, and when.
Build proof into your internal processes through the API: orders, accepted terms, contracts or records, sealed with no manual work. The file never leaves your server.
AI agents
Give your AI agent a way to prove what it did.
Every log, decision or result it records gets a verifiable proof that it existed at that moment and has not changed since. No manual steps.
How it works
Just 3 steps.
- 01
Choose the files
Select the exact version you want to protect.
- 02
We create the proof
Sellat computes its fingerprint locally and creates the evidence tied to that file.
- 03
Keep it and check it
Keep the proof and use it later to verify that the file matches.
Qualified (eIDAS) timestamp
What a qualified timestamp adds to your proof.
Add to your proof a qualified timestamp, issued by a qualified trust service provider on the EU trusted list (currently the FNMT-RCM), under Regulation (EU) 910/2014. It is issued over your file’s fingerprint and stays inside your proof.
- A qualified timestamp enjoys a legal presumption of the accuracy of the date and time it indicates and of the integrity of the data it is bound to, across the European Union.
- Anyone can verify it with standard tools (RFC 3161) against the EU trusted list, without relying on Sellat. The timestamp shows that this exact file existed at that moment; not who its author is nor the content of any agreement.
Use cases
Useful before a question arises.
You do not need to understand blockchain to protect an exact version. Here are three examples.
Protect your work or idea Your design or script, sealed before you show it 
Online store Every order with the terms the customer accepted Logs and records Your systems’ logs, sealed through the API Independent verification
Your proof can also be checked outside Sellat.
You keep the evidence, and others can verify it independently. Sellat does not establish authorship, decide who is right or prove what was agreed: it records technical evidence about a specific file.
Have the proof ready before you need it.
Protect the exact version of the file you want to be able to recognise later.
Protect files