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Secure your Bitcoin and sleep like a baby

COLDCARD is the world’s most trusted and secure Bitcoin Signing Device (a.k.a Bitcoin hardware wallet).

BUY COLDCARD Mk4

COLDCARD Mk4 Features

  • Dual Secure Element

    It provides the best Physical Security. Your seed words are stored in specialized chips, designed solely to securely store secrets. Now dual-vendor!

  • Verifiable Source Code

    All of the Coldcard code is viewable, editable, and verifiable. You can compile it yourself.

  • True Air-gap

    Only signing device (hardware wallet) with option to avoid ever being connected to a computer, for its full life cycle: from seed generation, to transaction signing. Uses PSBT (BIP174) natively!
BUY COLDCARD Mk4