What is a long-term method I can use to uniquely identify an iOS device?

Question

What is the best way to uniquely register an iOS Device, which won\'t be limited by future Apple restrictions?

My current approach to register an iOS device (basical

Answer 1

The best approach I've seen is using the keychain. You can generate an UUID with the CFUUIDCreateString function and store it in the keychain. This data stays in the device between installs and restores from backups.