In Germany, this is how identification works to some degree. You have an ID card number but this changes with every card. There is a permanent tax number but th

In Germany, this is how identification works to some degree. You have an ID card number but this changes with every card. There is a permanent tax number but this isn't used for anything but tax purposes. In the end, identification can be done by name, birth date and place of birth. You'll find these requirements on many official forms. This is fairly unique and ties to birth certificates which can be obtained with this information. Even if all databases were erased, this data could restore registers (as birth certificates have a paper copy).