It seems to me that the most robust solution is to do it the hard way: know the people involved really well, both directly and via reputation among people you also know really well—ideally by having lived with them in a small community for a few decades.
It seems to me that the most robust solution is to do it the hard way: know the people involved really well, both directly and via reputation among people you also know really well—ideally by having lived with them in a small community for a few decades.
This can also be done over the internet. Talk to their irl social circle.