One CardSigner.
As many cards as you need.
Each card holds its own seed encrypted behind its own PIN-code.
- Private keys
- Passphrases
- Multisig descriptors
- Passwords
On the included black metal Satochip SeedKeeper card.
- No Account
- No Vendor app
- No Cloud
- No Altcoins
Bitcoin only.
Open source software.
Anyone can read it and check it.
CNC-machined aluminium.
Sandblasted.
Anodized.
Every edge chamfered.
Silver buttons.
Designed and manufactured in Belgium.
Four screws.
Every part replaceable.
Step 1
Download the software yourself and write it to a microSD card.
Download & verify software Try the software in the simulator
Step 2
Plug in USB-C for power.
Use any USB charger or power bank you already have.
Create. Save. Load.
Create your seed on CardSigner.
On the device itself.
Save it to the card.
Behind its PIN-code.
Load it next time.
No words to type, no QR to scan.
- This is not a hardware wallet
- Built to last
- CNC-machined aluminium
- Smooth premium metal finish
- Sandblasted and anodized
- Solid tactile buttons
- USB-C power
- microSD card slot
- Card slot
- Four screws to open & verify
- Camera scans QR codes
- Off-the-shelf parts
- Raspberry Pi Zero v1.3
- Easy to repair
- No soldering
- No Wi-Fi, no Bluetooth
- A vault the size of a card
- PIN-protected secure element
- See what you sign
- Large 2.8-inch screen
- Pre-assembled or DIY kit
- Designed, manufactured & assembled in Belgium
- Every card is a key
- As many cards as you want
- As many seeds as you need
- Infinite possibilities
- One CardSigner
Sign by QR code.
Your wallet shows the transaction.
CardSigner scans it and signs it.
- Your wallet shows the transaction as a QR code.
- CardSigner scans it and shows where the money goes.
- You approve it on CardSigner.
- CardSigner shows the signed transaction as a QR code.
Your wallet scans it back.
Works with
Specifications
- Screen
- 2.8-inch IPS, 320 × 240
- Camera
- Reads QR codes
- Card
- Satochip SeedKeeper, black metal, PIN-code, one included
- Wireless
- None. No Wi-Fi, no Bluetooth
- Power
- USB-C
- Software
- SeedSigner smartcard fork, open source
- Case
- CNC aluminium, sandblasted, anodized, chamfered
- In the box
- CardSigner and one black metal SeedKeeper card.
Optional: extra SeedKeeper cards, a microSD card and a USB-C cable.
Pre-order CardSigner.
€275, VAT included, with one black metal SeedKeeper card.Extra cards: €35 each, up to five cards in total.You pay in full now, and we ship in December 2026.
