At approximately market close, I will visit the following page in an Incognito window: 

If that redirects to a login page (or full screen pop-up) the market resolves YES. Otherwise it resolves NO.

If others are able to check at the exact close time and provide screenshots I will accept that as proof unless there's reason to believe it's fraudulent. Otherwise it will be based on whenever I check, even if that turns out to be a bit later than the exact close (could be up to 48 hours, though I'll try my best to be quicker than that).

Any changes to the login wall between now and close don't matter, just the end state at close time as described above. It doesn't matter whether the login page can be bypassed/dismissed.

Same rules as the previous version of this market:

https://techcrunch.com/2023/06/30/twitter-now-requires-an-account-to-view-tweets/

If you’re not logged into your Twitter account and try to view a tweet, you’ll be presented with a sign in screen.