The FAA Aircraft Registry is already public and on the web
If you provide an aircraft ID (N number) as input you get information about the owner. I own an aircraft and my name and address are available to all via this registry if you know my aircraft N number (N4918Y for those who are interested) you can find my address.
There is nothing really new in making the same information available about drone owners. It is also my understanding that the NexGen (ADS-B) air traffic control system requires each individual aircraft to broadcast its unique permanent ID. This is quite different from broadcasting a transponder code assigned for a particular flight or the default visual flight rules code (1200).