Description
Build your own air-gapped Bitcoin hardware wallet. The SeedSigner is an open-source, stateless signing device that you assemble yourself from off-the-shelf components — no proprietary hardware, no vendor lock-in, no trust required. Your keys, your hardware, your sovereignty.
Why SeedSigner?
Commercial hardware wallets require you to trust that the manufacturer did not backdoor the firmware, embed a radio transmitter, or pre-generate your seed phrase. SeedSigner eliminates that trust assumption. The hardware is commodity Raspberry Pi components that you can inspect, the firmware is open-source and auditable, and the device has no WiFi, no Bluetooth, no USB data connection, and no persistent storage. Your seed phrase exists only while the device is powered on — it is never stored.
Communication with your wallet software happens entirely through QR codes displayed on the screen and scanned by the camera. There is no physical data connection between SeedSigner and your computer. This is what « air-gapped » actually means.
What is in the Kit
- Raspberry Pi Zero v1.3 — the version without WiFi/Bluetooth (intentionally chosen for air-gap security)
- WaveShare 1.3″ LCD HAT — 240×240 pixel display with joystick and 3 buttons for navigation
- Camera module — for scanning QR codes (seed import, PSBT signing)
- GPIO header — pre-soldered or hammer header for tool-free assembly
- MicroSD card — pre-loaded with SeedSigner firmware
- 3D-printed enclosure — protective case for the assembled device
- Assembly hardware — screws, standoffs, and ribbon cable
| Specifications | |
|---|---|
| Device Type | Air-gapped Bitcoin signing device (hardware wallet) |
| Processor | Raspberry Pi Zero v1.3 (1GHz ARM11, 512MB RAM) |
| Display | 1.3″ IPS LCD, 240×240 pixels |
| Camera | OV5647 or compatible CSI camera module |
| Connectivity | None (no WiFi, no Bluetooth, no USB data) |
| Storage | Stateless — no persistent key storage |
| Power | Micro-USB (power only, no data) |
| Communication | QR code only (camera scans in, screen displays out) |
| Firmware | Open-source (SeedSigner project, verifiable on GitHub) |
| Seed Generation | Dice rolls, camera entropy, or manual entry |
| Supported Formats | BIP-39 seed phrases, single-sig and multisig, PSBTs |
Compatible Wallet Software
- Sparrow Wallet — full PSBT support via QR codes (recommended)
- Specter Desktop — multisig coordination with QR scanning
- Blue Wallet — mobile wallet with QR-based PSBT signing
- Any wallet software that supports PSBT via QR codes (BIP-174)
What SeedSigner Can Do
- Generate new seed phrases using verifiable entropy (dice rolls or camera noise)
- Import existing BIP-39 seed phrases via manual entry or QR code
- Sign Bitcoin transactions (PSBTs) via QR code exchange
- Export xpub for watch-only wallets via QR code
- Participate in multisig setups (2-of-3, 3-of-5, etc.)
- Verify receive addresses on the device screen
Is this as secure as a Ledger or Trezor?
SeedSigner has a fundamentally different security model. Commercial wallets store your keys and rely on secure elements. SeedSigner stores nothing — you re-enter your seed phrase each time you need to sign. There is no attack surface when the device is off because there are no keys on it. The trade-off is convenience: you need your seed backup (metal plate, paper) every time you transact. For cold storage that you rarely touch, SeedSigner’s stateless model is arguably more secure.
Do I need to know how to solder?
No. The kit includes a hammer header or pre-soldered GPIO pins, so assembly is tool-free or requires only basic hand tools. The Raspberry Pi, camera, and LCD HAT stack together with screws and a ribbon cable. Total assembly time is about 15–30 minutes.
Why does this use a Raspberry Pi Zero WITHOUT WiFi?
This is intentional. The Pi Zero v1.3 (not the W or WH versions) has no wireless hardware at all — no WiFi chip, no Bluetooth chip, no antenna. This is a hardware guarantee of air-gap security that cannot be compromised by software. Even if malicious firmware was loaded, there is no radio to transmit data.
What happens if I lose the SeedSigner device?
Nothing. The device stores no keys. As long as you have your BIP-39 seed phrase backed up (ideally on a metal seed plate), you can restore your wallet on any compatible device or software. The SeedSigner itself is just a signing tool.
Can I verify the firmware myself?
Yes. The SeedSigner firmware is fully open-source on GitHub. You can review the code, build it from source, and verify the hash of the pre-loaded image on the MicroSD card. This is the whole point — don’t trust, verify.
D-Central Technologies — Bitcoin Mining Hackers since 2016. Sovereignty is not just about mining — it is about holding your own keys. Every hash counts.
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