AIR-GAPPED BITCOIN SIGNING
The one that came first, in milled aluminium AirgappedStatelessOpenYours
The original SeedSigner layout in a precision CNC-milled aluminium case, assembled and ready except for the microSD card. You download the firmware, verify it, flash it and put it in.
THE CASE
Milled aluminium, thumbstick and buttons
A precision CNC-milled aluminium enclosure with an aluminium thumbstick and buttons. Inside: a Raspberry Pi Zero 1.3 without WiFi, a Waveshare 1.3 inch LCD hat, a Zerocam mini camera behind a glass cover, on shortened hand-soldered low-profile gold pin headers.
STATELESS
There is nothing on it to find
No private key is stored on the device. It scans your seed in QR form, keeps it in memory only while it has power, signs, and forgets. The thing you have to keep safe is the backup you scanned in, not the device itself.
AIR-GAPPED
No radio, and no cable path for keys
The key component is the Raspberry Pi Zero 1.3, the version with no WiFi and no Bluetooth. Everything moves as QR codes: the unsigned transaction in through the camera, the proof of signature back out on the screen, read by your phone or laptop.
YOUR OWN CARD
You flash it, and you check it
No microSD card is included. Download the latest SeedSigner image from the project, verify it, flash it to a card and insert it. That is one more step than the v2 asks of you, and it is the step that puts you rather than us at the end of the trust chain.
HONESTLY
Who should take this one
This is the earlier premium build. The v2 costs a little more, includes the card, and adds a spring-loaded card slot, an optimised camera and a tighter assembly. Take this one if you already flash your own cards and do not need those revisions. If you want metal and this is your first SeedSigner, take the v2.
“Offline, air-gapped and stateless. Three plain reasons there is nothing here to take.
Seedsigner premium specifications
- Enclosure
- Precision CNC-milled aluminium
- Controls
- Aluminium thumbstick and buttons
- Core hardware
- Raspberry Pi Zero 1.3, without WiFi
- Display
- Waveshare 1.3 inch LCD hat
- Camera
- Zerocam Raspberry Pi mini camera, glass cover
- Wiring
- Shortened hand-soldered low-profile gold pin headers
- Storage
- microSD card not included, you flash your own
- Software
- SeedSigner, open source under MIT, stateless by design
- Works with
- Sparrow, Specter Desktop, Nunchuk, BlueWallet, Keeper
In the box
- Seedsigner premium, assembled in its CNC-milled aluminium case
- Waveshare LCD hat and Zerocam camera already fitted
- Aluminium thumbstick and buttons
- No microSD card. You supply one and flash the firmware yourself
Questions
What do I need before it will run?
A microSD card and about ten minutes. Download the latest SeedSigner image from seedsigner.com or the project's GitHub, verify it, flash it to the card, and insert the card.
How do I verify the firmware without a terminal?
Drop the file onto verify.bitsaga.be. It computes the SHA-256 in your browser and compares it against the hash the project published. Nothing is uploaded, nothing is tracked, and we host no firmware: the download button sends you to SeedSigner's own GitHub.
Should I buy this or the premium v2?
If you want metal and this is your first one, take the v2: it includes the card, the SD slot is spring-loaded, the camera is optimised and the build is tighter. Take this one if you already flash your own cards and the revisions do not matter to you.
Is my seed stored on the device?
No. It sits in memory while the device has power and is gone when you unplug it. If the device is lost or taken, there is no key material on it to extract.
Can I buy the aluminium case on its own?
No. The case is not available separately.
Images: seedsignerWider-scaled.png · IMG_20240130_121939-scaled.jpeg · IMG_20240130_122032-scaled.jpeg · IMG_20240130_121708-scaled.jpeg · IMG_20240130_121725-scaled.jpeg · IMG_20240130_122010-scaled.jpeg
The original, in metal
Assembled, milled, and waiting on the one card you bring yourself. Try the firmware in a browser tab first, verify what you flash, then power it up.