Why does Iris prompt me to sign a note containing only a number when opening my messages? What is it?

Why does Iris prompt me to sign a note containing only a number when opening my messages? What is it?

🤔 not for me or maybe I signed it without even noticing lol
Actually it's not just messages, seems like it does so when opening notifications too. But declining to sign doesn't block anything (e.g. I can still see the messages/notifications).
No joke it happens even when I do a www.google.com search!!!
Even weirder! I think the number is a timestamp, but I still don't know why it pops up. Any idea #[4]
?
Iris stores your latest "notifications seen" and "dms seen" timestamps so that you can use different devices and they are in sync. You can approve it if you like. There's a "feature" that will keep asking it unless you approve it automatically (tick that box). Will be fixed later.
Makes sense. Thanks for your answer!