Not so hilariously for people this applies to, but the combination of name and DOB still isn't actually unique either. I'll skip rewording it and just leave this link
It doesn’t need to be absolutely unique though. It just needs to make the secondary market infeasible. I would argue that only being able to re-sell tickets on the secondary market to “Chris Smith” is going to result in essentially no ticket scalping.
https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-...