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 1. Boot SeedSigner from microSD. 2. Enter seed via: - Dice rolls (entropy → seed). - Manual word entry. - SeedQR scan (encoded BIP39…