If you are going to make a commercially viable NFC door lock - my advice: make it accessible via Wi-Fi. That would be an absolute must.

Similar in functionality to lockitron with NFC. Otherwise, it will be too limited.

Also, if you really want to reach the largest market... Add bluetooth to the mix. Then the user would have the option to choose entry method...

I have not found a song that allows for the phone to wake.... Only, to unlock. Can anyone advise if this song exists?

The whole point for me was to wake AND unlock...

I don't use bitcoin and don't plan on using it... Is it possible to program the ring to use for credit card payments? And, if so, how?