Meta has made an extension that verifies the hash of the web version of messenger and whatsapp and it's using Cloudflare as a trusted 3rd party. Cloudflare's writeup is at https://blog.cloudflare.com/cloudflare-verifies-code-whatsap...

This seems like a good step in the right direction, but I am trying to figure out if anyone else can use this to publish more secure web apps and I can't seem to find any instructions or mentions of how this is usable for anyone else than just meta and their users. Is it?