Merge pull request #1163 from yulin-li/yulin/c2pa

[Azure AI Svcs] [avatar] add c2pa verification screenshot

Author: denrea

articles/ai-services/speech-service/text-to-speech-avatar/content-credentials.md

@@ -29,7 +29,7 @@ Content credentials in the Azure text to speech avatar can help people understan
 
 ## Limitations
 
-The content credentials are only supported in video files generated by batch synthesis of text to speech avatar, and only `mp4` file format is supported.  
+The content credentials are only supported in video files generated by batch synthesis of text to speech avatar, and only `mp4` file format is supported.
 
 ## How do I use content credentials in my solution today?
 
@@ -39,7 +39,15 @@ No extra set-up is necessary. Content credentials are automatically applied to a
 
 ## Verifying that a video file has content credentials
 
-As for now, self-serve verification of content credentials for text to speech avatar video isn't yet available. You can contact Microsoft for verification of content credentials of Azure text to speech avatar generated videos.
+You can check the content credentials of a text to speech avatar via either of the following methods:
+
+1. **Content Credentials Verify webpage ([contentcredentials.org/verify](https://contentcredentials.org/verify))**: This is a tool that allows users to inspect the Content Credentials of content such as a video. If an uploaded video of a text to speech avatar is created with the Speech service, the tool will show that and display the issued date and time of the Content Credentials. This screenshot shows an example avatar video upload result where the Content Credentials were issued by Microsoft.
+
+  :::image type="content" source="media/avatar-content-credentials-verify.png" alt-text="Screenshot of the content credential verification website.":::
+
+  This page shows that a video generated by Azure TTS Avatar Service has Content Credentials issued by Microsoft.
+
+2. **Content Authenticity Initiative (CAI) open-source tools**: The CAI provides multiple open-source tools that can be used to validate and display C2PA Content Credentials. Find the right tool for your application and [get started here](https://opensource.contentauthenticity.org/).
 
 ## Next steps