Many countries have id numbers which are not a secret. In those countries you simply can‘t do anything with the number. Creating a bank account by mail with a s

Many countries have id numbers which are not a secret. In those countries you simply can‘t do anything with the number. Creating a bank account by mail with a ssn? Impossible you have to be at the department and show your passport. You cant be at a department? The postal service in germany can verify your identity if you are there, or there are some online webcam solutions where you have to show your passport in the webcam, rotate it by instructions etc.