It's simply a URI standard for crypto signatures. It provides no function except an address to something else. That's why Google is asking for a few "working" i

It's simply a URI standard for crypto signatures. It provides no function except an address to something else. That's why Google is asking for a few "working" integrations to prove the theory. Because someone goes to implement it and figures out the standard is missing something they need critically, they can modify the standard before it becomes a 1.0 standard.