How is a person to know that he is covered by a special act, since no documents confirming it are issued?

Currently, the fact that one is entitled under the so-called Special-purpose Act can be proven in two ways:

• having a PESEL number with UKR status (in which case the UKR status is disclosed in the notification of assignment of the PESEL number)  
• residence permit diia.pl accessible via the mObywatel app.