alt Hacker NewsInvite trees approximately solve this problem. I don't need to know who you are to know that someone in good standing in the community invited you.
Invite trees approximately solve this problem. I don't need to know who you are to know that someone in good standing in the community invited you.
And that if you misbehave you get booted out and whoever invited you gets dinged. If they get dinged enough they become a leaf rather than a branch.