Version 2.1.1 is available in the Play Store now. This version contains one fix that was causing the app to crash whenever you tried to scan QR codes because I hadn’t exported it to request permission to access the camera. Just one little checkbox that I missed! It should make sharing easier now.
Download from the Play Store and let ChastiKey be your keyholder: https://play.google.com/store/apps/details?id=co.uk.kevincross.chastikey&hl=en_GB