[avatar] add c2pa verification screeshot

Author: Yulin Li

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 +39,17 @@ 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.
+There are two recommended ways today to check the Credential of a video generated by Azure TTS Avatar Service:
+
+
+
+1. Content Credentials Verify webpage (contentcredentials.org/verify): This is a tool that allows users to inspect the Content Credentials of a piece of content. If a video was generated by Azure TTS Avatar Service, the tool will display that its Content Credentials were issued by Microsoft Corporation alongside the date and time of issuance.
+
+  :::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.
+
+1. **Content Authenticity Initiative (CAI) open-source tools**: The CAI provides multiple open-source tools that validate and display C2PA Content Credentials. Find the tool right for your application and [get started here](https://opensource.contentauthenticity.org/).
 
 ## Next steps