SeedSigner

DIY Bitcoin hardware wallet:

• Raspberry Pi Zero (or compatible) + camera + small screen.
• Boots from microSD running SeedSigner image.
• Stateless: no seed stored on device. User enters seed each session via dice / QR / hand-typed words.

Hardware (DIY)

• Raspberry Pi Zero W (~$10).
• Camera Module 1.3 / 2.1 (~$25).
• Waveshare 1.3" screen (~$20).
• 4 GPIO buttons.
• microSD with SeedSigner image.

Total: ~$60 in parts, plus 3D-printed case.

Operation