Recently, I am developing an app based on user health data tracking, which involves a scenario where a user wears multiple electronic watches. In this case, I need to distinguish the data sources to prevent the data from not being correctly distinguished when the user wears multiple watches. Currently, bundle identifier seems to be a great choice for me, but after trying to read the materials, it seems that after unbinding, I rebind it. Alternatively, rebinding on another phone would cause this parameter to change. Do you have any better ideas?