I don't understands how that system would help, can't you have multiple bank accounts? Except if all the banks transfer some strong common identifier like the social security number (and that sound pretty dangerous to share). Open 5 accounts in 5 different banks (I'm pretty sure you could even do it all at the same bank), and there you go... you will exist, but Ticketmaster would have no idea whether you are 5 different deanc or all the same one.