In slovenia, you have your name, surname and date of birth, but also unique citizen number (EMŠO) and your personal tax number. They tell you not to tell anyon

In slovenia, you have your name, surname and date of birth, but also unique citizen number (EMŠO) and your personal tax number. They tell you not to tell anyone your EMŠO... but EMŠO is generated from your date of birth, gender, former yugoslav republic you were born in (slovenia=50) and the sequental number of your birth that day (0-499 boys, 500-999 girls)... plus a checksum. So if you were born in slovenia, are a boy, and were a third boy born on 20th december 1970 (970... because why waste numbers?!?!), your emšo would be 201297050003K (K=checksum, too lazy to calculate). We also have a tax number, that they also tell you not to share... but then you open up an independent contractor business (technically, it's a not a seprate company, but "you" are the company), and your personal tax number is published in many many online systems, info pages, you have to put it on receipts, ads, you have to tell it when you're buying toilet paper for work use, etc. But yeah... if you want to open a bank account, you need a government issued id card (or passport), and they check it very very throughly.