Google AMP had the concept of Signed Exchanges so that you can host content on a third party server while proving its integrity https://developer.chrome.com/blo

Google AMP had the concept of Signed Exchanges so that you can host content on a third party server while proving its integrity https://developer.chrome.com/blog/signed-exchanges https://developer.chrome.com/blog/signed-exchanges Unfortunately, AMP itself was controversial and the system was not really adopted elsewhere, but it is something.