bitcoin-hardware-seedsigner
SeedSigner: DIY Bitcoin signing device. Raspberry Pi Zero + camera + screen. Boots from microSD, no permanent state. Stateless airgap signing. USE WHEN: building / supporting SeedSigner, designing stateless signing flows.
What this skill does
# 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 mnemonic). 3. Use as airgap signer for PSBT (QR transport). 4. Power off → seed wiped from RAM. No persistent storage of seed = no risk of physical seizure revealing keys. ## Compatible wallets - Sparrow Desktop. - Specter Desktop. - Nunchuk. QR transport: animated QR for PSBT in/out. ## Use cases - **DIY enthusiasts** wanting open hardware. - **High-security applications**: no firmware backdoors possible (you build it). - **Educational**: understand how HW wallets work. ## Compared to commercial | Aspect | SeedSigner | Commercial HW | |--------|------------|---------------| | Cost | $60 DIY | $50-500 | | Auditability | Full (you built it) | Trust manufacturer | | Convenience | Lower (boot every session) | Higher | | Permanent storage | None (stateless) | Encrypted internally | | Maintenance | DIY | Vendor support | ## Limitations - **Slower** signing (boot time + manual seed entry). - **No tamper-evident hardware** — Raspberry Pi has no SE. - **Camera quality** affects QR scan reliability. ## See also - [krux/SKILL.md](../krux/SKILL.md) - [specter-diy/SKILL.md](../specter-diy/SKILL.md) - [passport/SKILL.md](../passport/SKILL.md) - [coldcard/SKILL.md](../coldcard/SKILL.md) - [../wallets/backup/SKILL.md](../../wallets/backup/SKILL.md)
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