I was going to get an NFC ring initially. But then I woke up one night and decided that if I ever own a gun, and need it in the middle of the night because a zombie broke into my house. I'd want a system where I can stick my hand under the bed and pull out a gun. But this system shouldn't work for anyone else.

That pushed me over the edge and I got an implant a few weeks later. True story.

I still have to get around to buying a gun, let alone create an NFC reading smart holster.

There might be easier ways to differentiate individual hands if necrotic flesh is your threat model. :)

>I still have to get around to buying a gun

Please don't.

Use a four-digit pin that's by the users choosing. Works like a charm, totally water-proof and cannot otherwise inadvertently be retrieved. Also keeps brain-dead people out of the pool.

>Maybe I am clueless but why not just stick a NFC chip on the back of your smartphone or just get one with NFC?

Because then you don't feel as cool when you tell people about it.