This is an untested truley reckless hardware wallet, we take no responsiblity for loss of funds!
Koopa is a bare bones, build your own hardware wallet, based on the very affordable ($5) ESP32, and MH-ET-LIVE epaper module. The project uses Stepan Snigirev's incredible bitcoin library https://github.com/micro-bitcoin/uBitcoin
Koopa is a slightly altered version of Stepan Snigirev's hack at Bitcoin2019 https://github.com/stepansnigirev/esp32_watch
If you like this project and might even use or extend it, why not send some tip love! https://paywall.link/to/f4e4e