Have an electrical engineer compare the device with the free/libre hardware designs, have a security person review the hardware and software designs, and maybe run some tests. In short, it's hard to know with certainty but we can increase confidence. I haven't heard of a Coldcard, though.
Yeah, basically trust the collectiv mind. What do you mean you haven't heard of Coldcard? You don't know this device?
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I had to look it up, yes. It appears to be a nice device. But I can't trust a company that sells privacy or security related products while they use Google Analytics on their site.
