I don't know if there is a good solution. Mostly it's a trade-off against these problematic options: 1. your contacts to be stored server-side instead of devi

I don't know if there is a good solution. Mostly it's a trade-off against these problematic options: 1. your contacts to be stored server-side instead of device-side, where they might end up in the hands of an adversary 2. your contacts to be stored in some other, less-ubuquitous-and-less-likely-to-be-complete format on your device. Maybe signal could have write access to your contacts so that it could store its own identifiers in the address book, but I could see a lot of wtf moments coming up when privacy-minded folk see that permission request.