> ## Documentation Index
> Fetch the complete documentation index at: https://signatureapi-daf4ee54.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Verify a Deliverable

> Verify deliverable authenticity using Adobe Acrobat Reader's digital signature validation

To verify that a deliverable was generated by SignatureAPI, open the PDF in **Adobe Acrobat Reader** (free) or **Adobe Acrobat** (paid).

1. **Check the signature status.**\
   Look for a green check mark next to the signature icon. You should see the message:\
   **"Signed and all signatures are valid."**

   <img src="https://mintcdn.com/signatureapi-daf4ee54/UqiVROmDb8Tz-1YC/docs/images/verification.png?fit=max&auto=format&n=UqiVROmDb8Tz-1YC&q=85&s=a09725e68583596e2dd29ded9c9df227" alt="Valid Signature Message in Adobe Acrobat" width="2110" height="844" data-path="docs/images/verification.png" />

2. **Open the Signature Panel.**\
   Review the signature details.

All SignatureAPI deliverables are signed with a digital certificate issued to **Signature API, Inc.**\
To view the certificate's serial numbers and fingerprints, go to the [API verification guide](/docs/api/resources/deliverables/verification).