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Technically there is a chance that the logic running on Coldcards is different than what's on GitHub. Sure, you can build the firmware yourself then push it to your SD card and update using that, but the device itself could slightly alter the behavior of the firmware in a way that allows the Coldcard creators to access your keys. Highly improbable, and essentially impossible if you build your own Coldcard, but there's still a minuscule chance that this might happen with the prebuilt devices.
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