Electronic Timestamp: Trusted Time and Evidence

Electronic timestamp and trusted timestamping

Data connecting other electronic data to a time, with different assurance from a displayed clock or signing-log entry.

Published on

2026-11-06

Last updated on

A verifiable timestamp token differs from a device clock or displayed signing date.
RFC 3161 binds a data digest to time; it does not itself establish a human’s intent.
Qualified timestamp status requires additional service and legal conditions.

What is an electronic timestamp?

An electronic timestamp links electronic data to a time. The term can be used loosely, so distinguish a displayed date or workflow log entry from an independently verifiable timestamp token and its associated trust conditions.

What does an RFC 3161 token contain?

In RFC 3161’s time-stamp protocol, a time-stamp authority (TSA) signs a token containing a message imprint, identifying the hash algorithm and digest of the data, together with time and other required information. The protocol does not require the full document contents to be sent to the TSA.

The token can support evidence that the corresponding data existed by the indicated time, within the applicable accuracy and policy. It does not establish the exact moment a human read or agreed to a document, nor does the token alone establish who created the original content.

Device clock versus qualified timestamp

A computer clock or recorded signing date is not automatically trusted third-party time evidence. An RFC 3161 token is also not automatically qualified under EU eIDAS.

eIDAS Articles 41 and 42 set distinct effects and requirements for a qualified electronic timestamp, including a time source linked to UTC and protection by the qualified provider under the required conditions. Its presumptions concern time accuracy and linked-data integrity, not universal truth, personal consent or the agreement’s enforceability.

Why does timestamp evidence matter later?

Timing evidence can contribute to historical signature validation, especially when certificates later expire or their status changes. Assess the relevant TSA or trust service provider and qualified service listing where applicable. In PAdES profiles, timestamp evidence has a defined technical role; a visible signing date is not a substitute.

A Common Case: Distinguishing event time from time evidence

A Florida property-services team could need evidence that a signed document existed by a particular time. Its review can separate application log entries from independent timestamp evidence, while leaving the exact moment of human agreement as a separate question.

FAQs

Must a timestamp authority receive the full document?

RFC 3161 uses a message imprint, comprising a hash algorithm identifier and digest; the protocol does not require disclosure of the full document contents.