This is the first that I've heard of this and that'd be nice (I'm selling a decent bit of my collection and the tax stamp turns off a lot of people who aren't used to them.) One thing to SQLBullet, no SSN, but rather a D/L number or something similar. Maybe a minimum amount of info to ID, then a D/L or ID picture pops up on their site to confirm? I would never give up my SSN to a stranger on the street.