When you register you have to submit
a valid identity document,
a completed and signed application for registration.
In order to obtain data on your work experience and insurance period, the ESS can ask you to submit your workers book, or a certificate or diploma on the attained levels of your education.
If you are a jobseeker whose employment is at risk, you will also have to submit:
the termination of your employment contract due to business reasons, or
the employment contract for a definite period of time.