I think that would be a great feature.
It's a bit of a double-edged sword. On one side, it is promoting checking hashes and probably exposing people to that capability. On the other, web of trust betrays the zero-trust ethos, though it's probably the next best thing.
There's a pretty strong tech community on NOSTR that is well known and highly engaged. So, WoT seems like a viable strategy. How that works as NOSTR scales and the tech community becomes less dominant, I don't know.
I think the positives outweigh the potential negatives, though.
Cool stuff; keep it up guys!