Signed Exchanges (SXG) is a subset of the emerging family of specifications called
To help with debugging and to verify a specific page is served using SXG, you can inspect a URL using the URL Inspection Tool to find if any SXG related issues appear on the AMP section of the analysis.
You can diagnose issues affecting the indexed version of the page or use the “live” option which will check validity for the live version currently served by your site.
To learn more about the types of SXG issues we can report on, check out this Help Center Article on SXG issues. If you have any questions, feel free to ask in the Webmasters community or the Google Webmasters Twitter handle.
Posted by Amir Rachum, Search Console Software Engineer & Jeffrey Jose, Google Search Product Manager.