[zulfishah]

Thanks! The ID number is only referenced in this file: ~/Library/Mobile Documents/BJ97GLR9R3~com~cjournal~icloud/Configuration.plist

It's just a reference to check if your current device is participating correctly with the rest of the iCloud container, so that you can tell if someone deleted the iCloud container behind you while the app wasn't active, the app would be able to handle that situation. It's only exposed to the user in case something is wrong and the user can quickly check this value from that plist file. In practice, it hasn't proven too useful to expose this to users, but something to build on for a future update.