AIR-GAPPED BITCOIN SIGNING · V2
Metal on the outside, nothing on the inside AirgappedStatelessMilledOpen
The community SeedSigner in a precision CNC-milled aluminium case. This is the new V2 build: spring-loaded SD card slot, optimised camera, tighter and more solid, with a microSD card included so it runs the day it lands.
THE CASE
Milled from a solid block
A precision CNC-milled aluminium enclosure, with an aluminium thumbstick and buttons to match. Inside sit off the shelf parts: 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.
THE V2 BUILD
Rebuilt where it mattered
This is the new V2 version: a spring-loaded SD card slot, an optimised camera, and an even tighter, more solid build than the one it replaces. The component list has not changed. The assembly has.
STATELESS
Nothing left on it to take
There is no private key stored on the device. It scans a seed in QR form, holds it in memory while it has power, signs, and forgets. You can leave it on the desk. What you have to keep safe is the backup, not the box.
AIR-GAPPED
In through the camera, out through the screen
The Raspberry Pi Zero 1.3 at the heart of it is the version with no WiFi and no Bluetooth. An unsigned transaction arrives as a QR code you scan. The signed one leaves as a QR code on the screen. Your keys never touch a networked machine.
YOUR ORDER
Say which colour you want
Leave a colour preference in the order notes and we follow it where we can. By default we ship whatever we hold most of. The aluminium case is not available separately. A steel backup can go in the same order, from the picker above the buy button, and it arrives as its own line at its own price.
“Built like something you keep, and empty the moment you unplug it.
Seedsigner premium v2 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
- Build
- V2, spring-loaded SD card slot, optimised camera
- Storage
- microSD card included
- Software
- SeedSigner, open source under MIT, stateless by design
- Works with
- Sparrow, Specter Desktop, Nunchuk, BlueWallet, Keeper
In the box
- Seedsigner premium v2, assembled in its aluminium case
- microSD card, so it runs immediately
- Optional at ordering: a Seedfan steel backup for single sig, or the 3x Seedfan steel kit for multisig
- Optional in the same order: a Seedfan or titanium steel backup
Questions
What is different about the V2?
A spring-loaded SD card slot, an optimised camera, and an even tighter, more solid build. It also ships with a microSD card, where the earlier premium does not. The hardware list is otherwise identical.
It comes with a card, so do I still have to verify the firmware?
You should. The card means it runs out of the box, and you can still download the image from the SeedSigner project yourself, check it and flash it again. verify.bitsaga.be does the check in your browser: drop the file onto the page and it compares the SHA-256 against the hash the project published. Nothing is uploaded, and we host no firmware.
Can I add a steel backup at the same time?
Yes, from the picker above the buy button. It goes in as its own line at its own price, so you can see exactly what each part costs. Setup guidance is booked separately on our services page, not here.
Can I choose the colour?
Leave your preference in the order notes. We follow it where stock allows, and by default we ship the colours we hold most of. The aluminium case is not sold on its own.
Can I try one before buying?
Yes, and it costs nothing. The real firmware runs in a browser tab at bitsaga.be/seedsigner-simulator, so you can walk the menus, load a seed, export an xpub and sign a transaction first. Pick the stock firmware for this model, and use a public test seed, never one of your own.
Metal now, verified before you trust it
The V2 build in milled aluminium, with the card in the box. Try one in a browser tab first, check the firmware without a terminal, then order the colour you want.