A common problem in (remote) chastity keyholding scenarios is setting up a lock box that will both allow the keyholder full control over the lockee's access to the key, while also keeping the key readily available in the case of an emergency.

My idea (please let me know if you've seen it before): use two magnetic connectors, and have the lockee place the key in a way that shorts both contacts. Use a microcontroller to check wether the circuit is connected or broken - indicating wether the key is currently in place or has been removed.

The key can be taken at any time, but when it's removed, the keyholder is instantly notified (eg through tele or another messaging service that has a simple api for those things). Emergency access is possible at any time, and when the reason was not an emergency, the dominant can introduce the appropriate consequences.

The device is super simple and could run on a cheap battery for quite some time, so that unplugging won't stop key removal from registering.

Switching off the wifi can also be disincentivised by having the microcontroller do regular connection testing, log whenever the connection fails, and sends an update with network downtime at the end of the day. If there were any relevant gaps, the keyholder will notice.

The idea came to me when a key from a small lock that came with the chastity belt stuck to one of the Satysfier brand charging cables (as seen in the image). I've opened one up, and the construction is very simple - this is very doable with some pretty 3d printing, but could actually be done hackier by just chopping such a charging cable and hooking it up to a controller, nothing else required.

If people are interested, I can write up some code for an ESP32 or other Arduino like boards. I'm not experienced with 3d print design, but can probably whip something up too.

Just wanted to share :) Cheers!