swift - How constant is the Firebase Anonymous ID

Question

I'm building an app with Firebase Real-Time Database. The app will be mainly offline at first, but we are planning an online update later. I'm planning to use the anonymous sign in, to get an ID for the user and store all his data under this ID:

Auth.auth().signInAnonymously(completion: { (user, error) -> Void })

After signing in I get an ID that looks like something like this: pCfgFOvEYEYvfWHaaaaavKgs8h33

Is it guaranteed that this ID will ALWAYS stay unchanged on a given device? I couldn't find any documentation about this.

Answer 1

Waitting for answers