Specific terms of use of time-stamping service

Download the specific terms of use of time-stamping service

The purpose of these Specific Terms of Use (STU) is to define the conditions for accessing and using the Time-Stamping Service. They supplement the ToU of Universign services on which they take precedence and the Time-Stamp Policy.

Before any use of the Service, the User shall acknowledge:

  • that they have read these STU;
  • that they have the legal competence and authorizations to commit to the terms of these STU
  • that they accept the STU without reserve.

The acceptance of the User is materialized by clicking on the check box on the Website at the time of the creation of a User account.

The STU are made available to them by Universign on its website. They can be downloaded in PDF format.


  • Time-Stamp Authority (TSA): refers to the authority in charge of issuing the Time-stamp tokens under the Time-Stamp Policy.
  • Electronic Seal: means a process which guarantees the origin and the integrity of the Document on which it is liked.
  • Time-stamp token: means a structure that links a Document at a particular point in time, thus establishing evidence that it existed at that time.
  • Time-Stamp: refers to a process making it possible to certify, by means of Time-stamp tokens, that a document existed at a given time.
  • Certification Policy (CP): refers to the set of rules to which the CA conforms in order to implement the certification service.
  • Time-Stamp Policy (STP): refers to the set of rules to which the STA conforms in order to implement the Time-Stamp Service.
  • Service: refers to the set of services and software solutions that Universign undertakes to provide to the User under the terms herein.


The Service makes it possible to time stamp Documents using Time-stamp tokens issued according to the Time-Stamp Policy which describes more precisely the implementation and organization of the Service.

Article 1.1. – Access to the Service

Access to the service requires:

  • Adapted software equipment and materials to access the Service;
  • A User Account.

Use of the Service through the API requires the information system of the User to be configured in accordance with the requirements of the Documentation.

Article 1.2. – Service usage

The User sends the Document to be Time-Stamped to the Service, through the API, in accordance with the Documentation.

In response to the User’s query, the Service sends a Time-stamp token whose components are described in the Time-Stamp Policy.

Article 1.3. – Usage restrictions

The Service must not be used to provide evidence that an e-mail has been successfully sent to a recipient or received by him.

The Service does not constitute a service for sending electronic registered mail.

The Service must not be used for the purpose of identifying the author or the origin of the Document.


Subject to compliance by the User with the applicable ToU and STU, Universign guarantees the enforceability, within the meaning of European regulations, of the Time-stamp tokens created using the Service.

The Time-Stamping performed through the Service benefits from a presumption of accuracy as regards the date and the time contained in the Time-stamp token and the integrity of the Document to which this Time-stamp token relates.

The Time-Stamp Service is synchronized with coordinated universal time so that the Time-stamp tokens are accurate to within one (1) second.

The Time-stamp tokens are sealed by means of an Electronic Seal.

In the case of an event affecting the security of the Service and which could have an impact on the Time-stamp tokens, appropriate information will be made available to the Users through the publication Website.

The information needed to implement the Time-stamp tokens verification procedure described in the Time-Stamp Policy are available on the publication Website.

Universign does not guarantee that the Service is suited to the needs of the User. It is the responsibility of the User to verify this suitability, in particular by making sure that the provisions of the Time-Stamp Policy meet their own requirements.


The User undertakes to verify the validity of the Time-stamp tokens upon receipt in accordance with the verification procedure described in the Time-Stamp Policy.

In addition to the cases provided for by the Time-Stamp Policy, the Time-stamp tokens can be verified for a period of five years from the date on which they were issued.

The User also undertakes to verify that the time-stamped Document is the one that is transmitted to Universign for Time-Stamping.

The Service does not keep an archive of the Time-stamp tokens issued.


The User undertakes to provide Universign with accurate information for the use of the Service.

Archiving the Time-stamp tokens is the sole responsibility of the User.


In accordance with the Time-Stamp Policy and the applicable regulations, Universign retains data relating to the operation of the Service for a period of six (6) years.


Universign undertakes to comply with the policies and standards listed in the following table. ETSI EN 319 411-1 CP of the Time-Stamp Authority ETSI EN 319 421 Time-Stamp Policy

These policies are published on the publication Website; they are audited according to the standard EN 319 403 by an accredited organization.

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