Announcing AMP Real URL

The solution makes use of Web Packaging (which incorporates some clever use of cryptography) to allow the cache (run by Google, Cloudflare or others) to keep a copy of an AMP page and serve it quickly to the end user, but to also contain cryptographic proof of where the page originally came from. In cooperation with a browser that understands Web Packaging this means that a page can be stored in an AMP cache and served quickly from it while showing the original site URL in the browser’s navigation bar. Gone is the hated grey bar, all your visitors see is your proper URL:

Importantly your site is still being served from Google’s AMP cache just as before; all of this comes without any cost to your SEO or web performance.

Source: blog.cloudflare.com