The CDN is you, for all intents and purposes. It's your agent in the back and forth, as much as your hosting provider would be. A third-party cache isn't.
I don't mind that you can sign and verify content, that's fine and useful. I'm just not a fan of changing the address bar's meaning.
But what I'm saying is that the meaning that you ascribe to the address bar is incorrect -- it already only tells you who published the content, not who you are actually connected to.
What I'm saying is that this does not change the meaning of what's in the URL bar. It's the same as before. It tells you who published the content originally.
> it already only tells you who published the content
No, it tells you the origin of the document. If you are the creator, and you choose to put your content on server X it will tell you "I've got this from server X". Whether that server is a reverse proxy or a shared webhost or a dedicated server in a DC or a raspberry pi running on your desk doesn't matter - it's the designated original that you, the owner of example.org chose.
That's what it always meant, and it changes when you do a redirect, and it shows you the current URL even if there is a canonical header of http-equiv. I can put a reverse proxy on my host and proxy example.com to example.org - the address bar tells you that you're reading example.com, not example.org, as it should, because you're connected to me, not to example.org.
I don't mind that you can sign and verify content, that's fine and useful. I'm just not a fan of changing the address bar's meaning.