My friend beat him up with minor injuries and detained him for nine days. What does it mean when the police station asked for proof of household registration and proof of reality?

1. The other party was slightly injured and has been suspected of committing a crime;

2. Criminal detention has been processed, indicating that the Public Security Bureau has filed a case;

3. The police station is now Proof of household registration and proof of reality are required during investigation and evidence collection;

4. After the investigation is completed, the case will be transferred to the procuratorate for review and prosecution, and finally the case will be transferred to the court for trial by the procuratorate.