Test the device against an online program (or indeed many programs). If the device and the program(s) agree N times, you have to ask yourself why would you not trust the device on run N+1?
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@npub13wpu...qpdr agreement only tests the math. a device can derive every key correctly from a seed it quietly picked out of a tiny space and still pass every comparison you run. that is why people roll dice, the entropy comes from outside the box.