in the mini challenge , i have used scene.isDirty which return bool if the scene has changed so that in a prefab situation the scene wouldn’t change and the unique Identifier will be empty. i tried it and it worked as intended.So is that a good approach?

// your code here
         void Update() {
            if(Application.IsPlaying(gameObject)) return;
            SerializedObject serializedObject = new SerializedObject(this);
            SerializedProperty property = serializedObject.FindProperty("uniqueIdentifier");
                property.stringValue = System.Guid.NewGuid().ToString();

It’s fine. Sounds like a similar method that Unity itself uses to know if it needs to update things like the UI.

Yes, this should work fine. If the object you are editing is a prefab, then gameObject.scene.IsDirty should be false, and the rest of the code should never run. Using either IsDirty or testing the path will accomplish the same result.