Not trying to be a negative Nancy here - I've put a shitload of thought into this matter, and even having admin check the number first, then what?First off, it's going to take time to do that, and someone will have to be available and in a position of trust to act as middleman. (Like admin isn't spread thin enough already!)And you've effectively now added a third person who could take the funds and blame it on one of the other two.You'd need the wisdom of Solomon to settle that - and nobody would be happy having that btc-baby cut in half.Maybe institute a 'no-dishonesty rule' for both btc vendors and purchasers?