[giovannibajo1]

Moxie, what about showing a positive UI for users you have verified keys with? Something like the verified checkmark on twitter. I'm ok with this being client side of course, and possibly even lost if you reinstall the app (better than nothing).

I like to verify keys of my main professional contacts on WhatsApp, but it's hard to remember who you verified keys with, and then whether the key was changed since last time you verified it.

[dbrgn]

Threema offers that. You do a QR code scan, after which a contact is marked as verified (3 green dots). Since Threema has a fixed key per user, these verifications are persistent and most people transfer their keys when switching to a new phone.