The SeedSigner Standard is an open-source, air-gapped Bitcoin signing device designed for users who prioritize security, verifiability, and full independence. Built around a Raspberry Pi Zero v1.3 (the version without WiFi or Bluetooth hardware), it ensures complete air-gapping—no USB data transfer, Bluetooth, or network connectivity is possible.
The device operates statelessly: private keys exist only in volatile RAM during active use and are automatically erased upon power-off. This eliminates persistent storage of sensitive data, meaning no seed or key information remains on the device.
Entropy generation is user-controlled using physical dice rolls or camera noise collection. SeedSigner supports BIP-39 seed phrases (12 or 24 words), optional BIP-39 passphrases, custom derivation paths, and native generation of extended public keys (XPUBs) for multisignature wallets, including 2-of-3 or 3-of-5 setups.
All software and hardware designs are fully open-source and publicly auditable. Preassembled units arrive ready for immediate use after flashing the official operating system image to the included microSD card. DIY kits provide the core components for self-assembly, allowing greater control over sourcing and verification.
What’s Included
- SeedSigner device (preassembled or DIY parts)
- 3 × C12 seed phrase cards
- Edding pen and NovaSapien pigment-based pen
- NovaSapien and SeedSigner stickers
- USB cable
- New microSD card
- Printed instructions and marketing card
Colors
- Preassembled: Orange, Black, Red, Transparent, Vulcan
- DIY: Orange, Black, Red
This SeedSigner can be purchased together with the NovaSapien Self-Custody Kit – Sovereign Backup System for a complete, best-practices self-custody solution that includes both the signing device and comprehensive backup materials.
NovaSapien’s online self-custody courses offer detailed, step-by-step instructions accessible even for users with no technical background. We strongly recommend taking your time with the courses to build a thorough understanding of key generation, secure storage, and signing practices before proceeding. Official documentation and tutorials are available at seedsigner.com, and the SeedSigner Telegram channel provides additional community support.
Technical Specifications
- Weight: 0.15 kg
- Dimensions: 190 × 120 × 50 mm
- Warranty: 360 days on components
Optional Extras
- Sovereign Backup Kit
- SteelQR backups
Frequently Asked Questions
What is SeedSigner?
SeedSigner is an open-source, air-gapped Bitcoin signing device based on a Raspberry Pi Zero v1.3. It generates seed phrases, restores wallets, and signs transactions via QR codes, with no persistent storage of private keys or internet connectivity.
Preassembled vs DIY—what's the difference?
Preassembled units are fully built; flash the official OS image to the included microSD card. DIY versions supply components for user assembly. Both have identical functionality; DIY offers supply-chain control.
How secure is SeedSigner?
Stateless design (keys in RAM only, erased on power-off), full air-gapping (QR codes only—no USB, Bluetooth, WiFi), open-source code/hardware (auditable), user-controlled entropy. Supply-chain risk is low with generic parts; always use Pi Zero v1.3 (no wireless radios).
How do I generate a seed phrase?
Use physical dice rolls (highest sovereignty) or camera noise. Verify BIP-39 checksum manually. Dice rolls take time—don’t rush, as errors can lead to invalid seeds.
What is the transaction signing process?
Prepare PSBT in wallet software, scan QR to SeedSigner, review/approve on screen, scan signed QR back. If QR won’t scan, adjust brightness/density, clean camera lens, or try different distance.
Does SeedSigner support multisig?
Yes, generates XPUBs for 2-of-3/3-of-5 in Sparrow/Caravan. Test small amounts first; mismatches in wallet configs are a common issue—double-check derivation paths.
Which wallets and software are compatible?
Any with QR/PSBT support: Sparrow, Electrum, Specter Desktop, BlueWallet, Nunchuk. QR density/brightness issues can occur—adjust in wallet settings if scanning fails.
How do I update software?
Download latest .img from GitHub, flash to microSD using Raspberry Pi Imager or Etcher. Verify hash. Boot failures often come from bad flashes—re-flash and check power supply.
Where can I find support and resources?
Official tutorials/documentation at seedsigner.com. Community help on Telegram group, GitHub issues, @SeedSigner on X. NovaSapien’s online self-custody courses provide step-by-step guidance, especially useful for beginners—take your time to fully understand before proceeding.
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