I’m currently in the process of applying for my student visa to Belgium and I would please like some clarity on a few things:

For the “Attestation of registration or admission in a program of courses of university or
non-university higher education (article 58)” requirement, will just an admission letter from the university suffice or is there another document required?

The university I plan on attending offers their own proof of solvency procedure which seems to be somewhat similar to the blocked account system. However, for doesn’t seem to be an option on the checklist as proof of substenance:
https://storage.visas-be.tlscontact.com/visa-be/6bcf0edd-6370-4f2b-ade2-d0ff49d1dccc.pdf. Can I still go ahead with just a blocked certificate from my university as proof of sufficient means of substenance? If yes, will I still need the sponsorship form?