BitBoy
A stateless, QR-airgapped hobbyist hardware wallet
Workflow:
- Enter BIP39 seed on QWERTY keyboard
- (Optional) Export XPUB to desktop wallet with QR on device display
- Import unsigned PSBT with QR scanner
- After confirming outputs & fees, BitBoy will sign it
- Export signed PSBT with QR on device display
Shopping List
BitBoy
QR code airgap, keyboard. $110.
- M5stack "faces" kit ($70)
- Waveshare industrial QR scanner ($40)
BitBoy "lite"
MicroSD airgap. $42.
- M5Stack ($37)
- MicroSD card ($5)
How it works:
- Base MicroPython firmware
- Bitcoin primitives
- Drivers for display, buttons, keyboard
bitboy.py
in this repo contains the hardware wallet logic itself. It's a modern asyncio event loop!wallet.py
is a primitive watch-only wallet leveraging Bitcoin Coreui.py
is a shitty UI connecting BitBoy and wallet.py / Bitcoin Core- Eventually I want this all to work in Junction
Status
This is alpha software, testnet-only for now.
If you'd like to build one, buy the items in the shopping list. Instructions will be posted in the next week. You can DM Justin with questions on Twitter.