SeedSigner
Open-source air-gapped DIY Bitcoin signing device with multisig support.
Why We Recommend SeedSigner
100% open-source (MIT license). No pre-built hardware to trust—build it yourself from generic components. Community-driven project since December 2020. Stateless design (no secrets stored on device). Reproducible builds for verification.
Best For
Ideal for Bitcoin users who prioritize self-custody and strong security without relying on commercial hardware wallets. Especially suitable for technically inclined individuals, those in regions with import restrictions, or anyone wanting a customizable multisig setup with complete control over private keys in an air-gapped environment for under $50.
Services & Features
- Air-gapped QR code signing
- Stateless operation (all memory wiped on power off)
- Dice roll entropy for trustless seed generation
- SeedQR format support
- Multisig support with Sparrow, Specter, BlueWallet, Nunchuk
- BIP85 child seed generation
- Message signing and address verification
Considerations
Requires DIY assembly (Raspberry Pi Zero v1.3, camera module, LCD display). No customer support—community-driven help only. Technical knowledge needed for setup. Recommend using Pi Zero v1.3 (no WiFi/Bluetooth) for maximum security.
