Using PKCS12 certificates to authenticate a Seal is a little more complex to understand than using a documentary certificate.
For a better understanding, we refer you to the abundant literature on the web on this subject..
A PKCS12 electronic certificate is inviolable, you can consult it using independent tools from DIGIPROOF :

Consultation of PKCS12 certificates
We suggest that you view DIGIPROOF electronic certificates using applications independent of DIGIPROOF, often free, installable on Windows or Linux. Among these products, we suggest you use Keystore Explorer, for relative simplicity and reliability. It is software used worldwide, the editor is completely independent of DIGIPROOF.

