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Coldcard Mk3

$129.97

Secure your Bitcoin and sleep like a baby
Coldcard is the world’s most trusted and secure bitcoin hardware wallet.

It provides Physical Security. Your seed words are stored in a specialized chip, designed to securely store secrets.

Additional information

Brand

Coinkite

Category: Product ID: 20294

Description

Secure Element
It provides Physical Security. Your seed words are stored in a specialized chip, designed to securely store secrets.

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

True Air-gap
Only hardware wallet with option to never be connected to a computer, for full operation: from seed generation, to transaction signing. Uses PSBT (BIP174) natively!

Duress PIN

We provide an optional “duress PIN code”. If you enter that PIN code, instead of the “real” PIN code, nothing special is shown on the screen and everything operates as normal… However, the bitcoin key generated is not the main key. It is effectively a completely separate wallet!

To take best advantage of this feature, you should put some Bitcoin into the duress wallet. How much you are willing to lose or what you need to make it plausible, we don’t know.

The “duress” wallet will still be derived from the original BIP39 words, so you don’t need to back it up separately, but there will be no way to get from that wallet back to the original wallet with the real funds in it.

Countdown to Brick PIN

This is a covert variation of the BRICK ME PIN mode. It forces a time delay (of minutes/hours/days) when logging into the Coldcard.

But once set, unlike the normal countdown, this special mode covertly bricks the Coldcard. Again, this may form some part of your game-theory for duress situations, but is completely optional.

The goal of this mode is to provide plausible deniability of a required time delay (similar to Bank’s sages), while denying the attacker a functional device in case they take it away.

BIP39 Passphrases (25th word)

We now support BIP39 passphrases so you can also create an unlimited supply of distraction wallets. This feature is also useful for your own organization of funds or accounts. Unlike the single duress PIN, an unlimited number of related wallets can be created using BIP39.

Brick me PIN

Another PIN can also be defined, which we call the “Brick Me” PIN. Using that PIN code at any PIN prompt, will destroy the secure element and render your Coldcard worthless. Again, this may form some part of your game-theory for duress situations, but is completely optional.

Login Countdown

Force a time delay when logging into the Coldcard. Once enabled, you must enter the PIN correctly, and then wait out a forced delay (of minutes/hours/days) while a countdown is shown on-screen. Then enter your PIN correctly, a second time, to get in.

 

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