As theboss mentioned [1], is:
(a) browser crypto theoretically impossible, is it
(b) that something's practically from browsers today (like build-in crypto code) for a practical solution, or is it
(c) that existing attempts have not attempted to do something that is theoretically possible?
If I understood you correctly, you alluded verification might be possible [2] but it seems there isn't yet a clear description or understanding of what's possible and what's not.
