... or maybe even just save some sort of hash of the display name so that a change can easily be detected (and subsequently update the saved hash if and when I verify it's okay to do so).

Regarding the privacy issue, this might be a stupid idea, so I won't hold it against you if you just ignore it. 😉 When I choose to follow someone, add a nickname initially populated with that user's display name - but encrypted by my nPub (requiring my nsec to decrypt). Then, clients could indicate to me when the encrypted version of that user's display name no longer matches the saved nickname... and, if I wanted, I could choose to have the nickname updated to stay current with the new encrypted version of that user's display name. (though maybe simply 'saved_name' would be a more accurate description than either 'nickname' or 'petname').

The privacy issue hadn't occurred to me; but, I see now how someone could inadvertently (or intentionally) dox you through your "petname"... that could be a problem. As far as usage goes, maybe the standard client action could be to populate the nickname to match the display name at the time of being added to a follow list... if that nickname never got changed from that point on, so be it.

#askNostr, As we should all know, it's pretty trivial for a Nostr user to change their profile name and picture. I think this is a good thing (maybe couldn't stop it even if we wanted to). However, it seems like this ability could be gamed to help facilitate impersonators in a way that could evade most detection: e.g. if an nPub I'm already following decided to impersonate another nPub I'm already following, I don't think I would notice. Obviously, this would require a much longer game by a would-be impersonator than the issue is addressing in his note I've quoted here; but, the solution to this long-game impersonator might be pretty simple: Nicknames (a la, what the Signal app uses). If every entry in your follow list also had a 'Nickname' field, it could easily be used to always display the nPubs name that was used at the time you chose to follow that nPub; or even whatever Nickname you chose to assign to that nPub. Maybe clients could allow you to toggle between displaying the nPub's chosen name, or whatever nickname you've chosen for the nPub, or perhaps both simultaneously. At this point, I'm just rambling; and this doesn't currently seem to be a big issue; but whenever I notice someone who I follow has changed their profile name otherwise unannounced, something in the back of my mind is tells me this presents a potential danger that could be hard to detect.

Yeah, I've started noticing this a few years ago... I don't even bother anymore... unless I forget not to bother until another of my comments disappearing reminds me again.

I mostly use noStrudel, and I never paid any attention to the public key color. However, when considering adding an nPub to follow, I do pay attention to how many it is followed by who I also already follow. This is the information 1 line down from where your screenshot cuts it off. For example, it tells me that your legit nPub is followed by 83 who I also already follow... that seems pretty good to me.

"...private equity accessible via blockchain...available exclusively through Robinhood’s EU crypto app..." This makes no sense to me. Can someone explain what the point of using a blockchain is (as opposed to just using a conventional database) when the app in and of itself is a single point of failure?

🤣 "I don't know what this is... I think It's a popular brand everyone's wearing." It's still SOOOO early!

... after 'crashing' back to $100k, Bitcoin will once again be declared dead and a complete failure.

All government assistance - to the extent it's even necessary - should always come in the form of facilitating the beneficiary's unqualified participation in the open market; not in the form as a replacement of that market.