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description Coldcard Mk4 Overview
The Coldcard Mk4 is widely considered the gold standard for Bitcoin-only security. It is designed for users who want to minimize their attack surface by focusing exclusively on the Bitcoin protocol. It supports air-gapped transactions via microSD cards, allowing you to sign transactions without ever plugging the device into a computer. With features like 'brick-me' PINs, duress wallets, and physical tamper-evident packaging, it is built for the most paranoid and security-conscious Bitcoiners.
It is not for beginners, but for those who understand the nuances of self-custody, it is unmatched.
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