How do I add a trusted timestamp to my PDF document in Adobe Acrobat?

Open your PDF in Acrobat. Go to 'All tools' > 'Use a certificate'. Select 'Timestamp' to get a timestamp from a trusted Time Stamping Authority (TSA). This proves the exact time of signing.

Why is Long-Term Valid (LTV) data important for digital signatures?

LTV data is important because signing certificates can expire. Without LTV, your signature might appear invalid after your certificate's expiration date. LTV data ensures your signature remains valid for many years, which is crucial for legal and archival documents. It embeds all necessary verification information into the document itself.

What happens if I don't use a trusted Time Stamping Authority (TSA) for my timestamp?

If your timestamp does not come from a trusted TSA, it might not be recognized as valid. This means the proof of when your document was signed could be questioned. Always ensure your TSA is part of a Public Key Infrastructure (PKI) to guarantee its reliability and acceptance.

Can I renew the LTV data of a signature without invalidating the original signature?

Yes, you can renew LTV data without making the original signature invalid. This is a key benefit of LTV, especially for documents that need to remain legally sound over very long periods. The renewal process updates the verification information while preserving the integrity of the initial signature and its timestamp.

How does a timestamp differ from a digital signature in securing a document?

A digital signature proves who signed a document and that it hasn't changed since. A timestamp, on the other hand, specifically proves *when* the document was signed or existed. It's like 'a lock for the lock' – it secures both the signature and the document to a precise moment in time, adding an extra layer of non-repudiation and trust regarding the timing.

Automate timestamp LTV signing via API or scripting in Adobe Acrobat — How-to & AI prompts

AI prompts

3 ways to ask · copy any one

AExecute — “help me do it”Show me code to add LTV timestamps to PDFs using the API...…+

Show me code to add LTV timestamps to PDFs using the Adobe PDF Services or Acrobat Sign API for [programming language] and [authentication method].

when the reply comes backWant to see how to verify LTV signatures after signing?

BImprove — “do it better”Review my script for automating LTV timestamp signing and suggest...…+

Review my script for automating LTV timestamp signing via API and suggest ways to improve reliability, error handling, and security.

when the reply comes backNeed help setting up API authentication for your script?

CDecide — “help me choose”Explain the difference between PDF Services and Acrobat Sign API for...…+

Explain the difference between using Adobe PDF Services API and Acrobat Sign API for automated LTV timestamp signing, and help me choose the best one for [my use case].

when the reply comes backCurious how to handle errors when the timestamp server is down?

How to do it

the tool · the steps · what to avoid

1
Obtain a valid digital ID (certificate) that supports timestamping and Long-Term Validation (LTV) from a trusted Certificate Authority.
CautionEnsure the certificate is enabled for timestamping and LTV, as not all certificates support these features.
2
Install the digital ID in the operating system or Acrobat's trusted identity store.
3
Identify a Time Stamp Authority (TSA) that provides RFC 3161-compliant timestamping services and obtain its URL.
Best practiceSome TSAs require authentication; check with your provider for API keys or credentials.
4
Configure Acrobat's trusted identities and timestamp server settings to include your TSA endpoint.
NoteIn Acrobat, this is typically done via Preferences > Signatures > Time Stamp Servers.
5
Write an Acrobat JavaScript script that uses the 'signDoc' and 'addTimeStamp' methods to digitally sign the PDF and apply a timestamp from your configured TSA.
Best practiceSee Adobe's JavaScript for Acrobat API Reference for 'signDoc' and 'addTimeStamp' usage.
6
In your script, set the 'certify' parameter to true and enable LTV by specifying the 'embedValidationInfo' option if available.
NoteLTV embedding is supported in Acrobat JavaScript by setting 'embedValidationInfo' to true when signing.
7
Execute the script via Acrobat's JavaScript console, an Action Wizard, or by integrating it into a batch process using the Acrobat SDK.
Best practiceFor automation at scale, use the Acrobat SDK with C++/COM or JavaScript to trigger batch signing.
8
Verify the output PDF to ensure the digital signature is present, timestamped, and marked as LTV-enabled.
NoteOpen the signed PDF in Acrobat and check the Signature Panel for LTV status.

In the appWith the API

You can automate timestamped LTV signatures in Acrobat by scripting with JavaScript and configuring trusted timestamp servers.

Adobe Acrobat JavaScript API provides 'signDoc' and 'addTimeStamp' methods to automate timestamp LTV signing.

The real tasks

the one, listed here

Annotate the customer complaint file with timestamps and notes so the service team can act on recurring issues

FAQ

about this task

To automate LTV timestamp signing, you send your PDF to the Acrobat Sign API endpoint for digital signatures, include the option for timestamping, and handle authentication in your code. The API will return the signed PDF with the timestamp applied.

A regular digital signature proves who signed the PDF, but an LTV signature also includes extra information so the signature can be checked and trusted even years later, even if the certificate is expired or revoked.

A trusted timestamp shows exactly when a document was signed, which is important for legal or business reasons. It helps prove the document existed and was signed at a certain time, even if the signer’s certificate changes later.

Both APIs can handle digital signatures, but Acrobat Sign API is focused on signing workflows and legal compliance, while PDF Services API is more general. Choose based on your needs for workflow, compliance, and available features.

If your API call fails, check your authentication, the endpoint URL, and your request format. Also, make sure the timestamp server is reachable. Handle errors in your code so you can retry or log what went wrong.

Automate timestamp LTV signing via API or scripting

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help