For some purposes, you are requested to provide a proof of registration as PhD candidate. For example, before participating in a conference, or before admission to (student) housing. 

Radboud University has a standard format for this. You can request the proof of registration from your Graduate School Coordinator. Your Graduate School Coordinator can generate the proof of registration in Hora Finita and send it to you via e-mail. 

The proof of registration includes your name, date and place of birth, start date and expected end date of your PhD track and the name of your PhD supervisor.