That would be some work to do. I am not going to spend time proving that my suggestion would work. There are not even enough prove to show that whom are the returning conmen. This implementation would means people like casual conmen or ffkers or blacklisted people would think twice before serious trying to do bad things. It is by no means a way to stop these people.

Just like how copy protections are being used in audio cds or pc games. You don't see these protection stopping piracy but you know that it is there to make life harder for people to pirate them. Publishers are willing to pay for those copy protections because it helps to fend of casual pirates.

I am not doing very extensive trading, so it doesn't really affect me but seeing people getting conned, ffked, scammed and all is really depressing. It really brings out the ugly side of Malaysian society. Worst is not so much as the victimizer but the victims who got scammed are the saddest. These people are just so ignorant when they see $$$ and no amount of teaching or tutorial are strong enough to beat the power of money. Of course it doesn't apply to everyone. Some really got scammed by opportunist under circumstances.