The date no one can dispute.
A Qualified Timestamp proves two things at once: that your document existed at an exact moment and that not a single comma has changed since. With a legal presumption in your favor and recognition across the European Union.
- Qualified under eIDAS
- Any file type
- Verifiable by third parties
Two guarantees in a single seal
The timestamp binds your document's cryptographic hash to the official time: existence on a date and integrity ever since, in a single act.
Proof of existence
It proves the document existed, exactly as it is, at the moment of sealing. Nothing created later can claim that date; it sounds obvious, and it is precisely what you need to prove.
Proof of integrity
Any later modification, however small, breaks the match with the timestamp. If the timestamp verifies, the document is exactly the original.
Valid across the EU
As a qualified timestamp under the eIDAS Regulation, it enjoys the presumption of accuracy of the date and integrity of the data, and is recognized in every Member State.
Any file
PDFs, images, spreadsheets, code, video… The timestamp is applied to the cryptographic hash, so the format doesn't matter.
Standard verification
Any third party can check the timestamp with standard market tools, without depending on us to validate it.
One at a time or in batches
Timestamp a single document from the web or thousands a day via API, integrated into your archiving and invoicing processes.
What do you need to date today?
- Creative work and intellectual propertyDesigns, manuscripts, music, code: proof of authorship prior to any dispute.
- Quotes and offersPin down what you offered and when, before negotiation blurs it.
- Minutes and internal agreementsPartner, shareholder and board decisions with an indisputable date.
- Technical evidenceExpert reports, screenshots, activity logs and audit files.
- Regulatory complianceDocument archiving with long-term integrity guarantees.
- Condition photographsThe state of a construction site, a vehicle or a property on a specific date.
Timestamping is a matter of seconds
Provide the document
Upload it from the web or send it via API. The seal is applied to its unique cryptographic hash.
We issue the qualified seal
Our timestamping authority issues the Qualified Timestamp that binds hash and official time together.
Keep seal and document
You receive the timestamp along with your document. Together they prove date and integrity to anyone, whenever needed.
Qualified means legal presumption
Article 41 of the eIDAS Regulation (EU) 910/2014 grants qualified electronic timestamps the presumption of accuracy of the date and time they indicate and of the integrity of the data to which that date and time are bound. In practice: you are not the one who has to prove the date; it is the other party who would have to rebut it.
Common questions about timestamping
What exactly does “qualified proof of date” mean? +
That the document's date does not depend on the word of whoever submits it: a qualified third party has fixed it cryptographically. It serves to prove that something existed “before” a relevant event: a dispute, a third-party filing, a legal deadline.
Do I have to send you the document's content? +
The timestamp is applied to the file's cryptographic hash, a mathematical digest that identifies it uniquely without revealing its content. Working via API you can compute the hash in your own systems and timestamp confidential documents without them ever leaving your premises.
How does a third party verify the seal? +
The seals follow the international timestamping standard, so they can be checked with the usual tools for validating electronic signatures and seals, with no need to contact us.
Does it complement other lofirmo services? +
It already does: the evidence reports of our notifications and contracts are sealed with this very service. As a standalone product, it lets you give qualified proof of date to any document of your own without sending or signing it.
Give your documents a date beyond question
Create your free account and timestamp your first documents with the trial credit.
Prefer to talk it through? +34 910 606 161 · Monday to Friday