@Rahul2001 @Bob I think I like the double parameter better than a random string type link. The link can be shared by text/email, but not so easy by voice.
@Bob Since it's intended to be anonymous, I could meet Mr J.Q.P on the street, tell him the two parameters and meet in chat later. Even before I login myself. If it's any kind of generated link, someone has to login first to get that link, then find a way to share it.