Here's another post on SN for the Mk4:
🎥 Demonstration of transferring data from NFC-equipped COLDCARD wallet MK4 to mobile | @econoalchemist #16477
And another post on SN for this Tweet:
Its time to show off @Coinkite’s newest @COLDCARDwallet, the Mk4 🔥🔥🔥 In this quick video tutorial, I go through the process of extracting a wallet address from the hardware device onto a mobile phone. Take a look! 👀 #20362
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