Keycard Shell
Modular, air-gapped hardware wallet for easy self-custody The Keycard Shell is a fully open-source hardware wallet designed for air-gapped transaction signing using easy to use removable Keycards. It separates the signing device from key storage, allowing private keys to remain inside a certified secure element at all times. This design supports long-term, sovereign self-custody without reliance on closed firmware, wireless connections, or vendor-controlled infrastructure. You can easily create a new key and save it to a Keycard
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About this product
Features
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Air-gapped operation
Transactions are signed offline using QR codes. No USB data connection, Bluetooth, Wi-Fi, or NFC is required for signing. -
Removable secure element
Private keys reside on individual Keycards. Each card can have its own PIN and seed, enabling separation of wallets, backups, or roles. -
Open-source hardware and firmware
The device firmware, hardware design, and tooling are fully open source and auditable. -
Replaceable battery
Powered by a standard BL-4C battery, allowing easy replacement and extended device lifespan. -
On-device verification
Built-in screen and camera allow users to review transaction details before signing. -
Duress PIN support
Optional secondary PIN can reveal a decoy wallet if entered under coercion.
What’s included
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1 × Keycard Shell device
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2 × Keycards
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Replaceable battery
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Quick start documentation