This is what nostr needs. Nostr must be prepared for bots, those will come. In past I had an idea of trust links. In centralised systems we see for eg 163 good rep and 2 bad, in decentralised it can be gamed by bots. So if we want to have it w/o central authority reputation can be sorted out by wage of particular "good" or "bad" reputation. If A had relation with B then he/she knows that B is real thus reputation given by B to C is probably real. In this case if we have chain A->B->C->D then it should(?) have lower wage than A->B->C. Its not technical solution its rather how reputation is presented to user. I think we could give ourselves reputation when we meet in meatspace.