CardSigner
A CNC-machined aluminium bitcoin signer with a smartcard slot. Pre-order, ships in December 2026.
Pre-order. Ships in December 2026.
About this product
CNC-machined aluminium, sandblasted and anodized black. Every edge chamfered. Silver buttons. Designed and manufactured in Belgium.
A hardware wallet keeps your seed inside. CardSigner saves it to a card and then forgets it. Create your seed on CardSigner and save it to a PIN-locked Satochip SeedKeeper card. Unplug it: the seed is gone from the device, and the card keeps it.
Your wallet creates a transaction. CardSigner scans it and signs it.
- Runs ShieldSigner: open source, community-made software
- Bitcoin only. No account.
- 2.8 inch IPS screen, 320×240, camera for QR codes
- Smartcard slot for SeedKeeper cards
- No Wi-Fi, no Bluetooth, USB-C power
Black metal SeedKeeper cards are optional: up to five, EUR 35 each.
Pre-order: you pay in full now, and we ship in December 2026.
Download and verify the firmware yourself at verify.bitsaga.be.