description Coldcard Mk4 Overview
The Coldcard Mk4 is an air-gapped hardware wallet, meaning it never connects directly to the internet, providing the highest level of security. Transactions are signed and transferred via microSD card, eliminating the risk of online attacks. It's primarily focused on Bitcoin but supports other cryptocurrencies. Designed for advanced users, the Coldcard offers a high degree of customization and control.
Its secure element chip and robust construction make it a formidable defense against physical tampering. While the interface can be complex, the enhanced security makes it a top choice for Bitcoin maximalists.
help Coldcard Mk4 FAQ
How does the Coldcard Mk4 sign transactions without internet?
The Coldcard Mk4 is an air-gapped hardware wallet, meaning it never connects directly to the internet. You sign transactions by moving them via a microSD card between your online computer and the device, eliminating the risk of online attacks.
Can the Coldcard Mk4 store Ethereum or altcoins?
No, the Coldcard Mk4 is primarily focused on securing Bitcoin. It is a dedicated Bitcoin-only hardware wallet designed to minimize attack surfaces associated with multi-coin firmware.
What kind of power source does the Coldcard Mk4 use?
The Coldcard Mk4 features dual secure elements and is powered via a standard USB-C connection or a 9V battery. This allows you to power it completely offline using a battery during the transaction signing process.
Is the Coldcard Mk4 PIN code secure?
Yes, the Mk4 uses a complex PIN system that requires two separate PIN entries (prefix and main) to unlock the device. If a thief enters an incorrect prefix, the device can present a duress wallet or brick itself to protect your funds.
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