I mean why not just use a authenticator app, and Bluetooth.. With esp32.
⚡️🚪 WATCH - Unlocking a door with a Bitcoin Lightning payment.
https://blossom.primal.net/e1d276022b548cc8bb96039a294f07e94b631c753bd958d726df074750273bec.mp4
Discussion
Because nearly every Bitcoin person had lightning... Even a Cash App user can access this. I'm fact cash app does free lightning payments.
