keycard shell
One secure device,
infinite backups
Unrivalled security with an infinite number of removable Keycards, each with their own key.
Coming 2025 Bundled with Keycard
Unparalleled security
Keycard's secure element has passed Common Criteria EAL6+ certification.
Stateless
Your information and private keys are never stored on the device.
Clear security model
Your private keys will never leave Keycard's secure Element.
Fully open source
Our software, hardware and construction are fully open source.
Convenient, secure and made to last
Runs for ever
With the use of a very common replaceable Nokia BL-4C battery.
Ethereum support
Works out of the box with your favourite Ethereum wallets.
Large display
Verify the correctness of transaction data on the secure device.
Air-gapped
Send transactions through the air via QR code standard ERC-4527.
Easy to backup
Use multiple cards as backups, each protected by a unique PIN.
Bitcoin support
Something here about how it’s really super cool and a great feature.
Running on open source software
Full visibility of seed phrase
All the words clearly numbered and visible ready for you to write them down.
Human readable tx data
Get a clear understanding of what you’re actually signing.
Secure PIN for each card
Switch your card, enter your pin, and you’re ready to sign a transaction.
Compatible QR wallets
Its embedded camera allows Keycard Shell to be used fully airgapped.
Block USB data transfer
Add an extra layer of safety every time you connect your cable to charge.
Name your cards
Easily identify your cards by giving them a unique name.
Keep your device at home
Stored away on a drawer, or hiding in plain sight, Keycard Shell is stateless without a Keycard.
Take your keys with you
Discreet and light, your Keycard fits perfectly in your wallet ready to go, everywhere!
Fully airgapped
Sign transactions on your favourite wallets through QR signing
Many use cases,
multiple Keycards.
keycard shell
One device for all
your Keycards
Unrivalled security with an infinite number of removable Keycards, each with their own key.
Coming 2025 Bundled with Keycard
