You share an encryption key like with a group chat on a messenger. Each channel gets one. To join, you need the channel name and the key.

The best use case we see is for off-grid comms. Hurricanes are a thing here, and the power goes out for days or weeks.

I'm experimenting with motion sensors that broadcast to the channel, also. So the neighbors know your house is being burglarized. In this area that's like a hunting permit being issued.