&gt;TREZOR asks for external entropy during the initialization and this one is mixed with an internal one. Even in the unlikely change that internal RNG generator fails, you should be on the safe side.<p>Assuming it actually uses it.<p>&gt;The whole design is (hardware and software) is open-source. You don&#x27;t need to trust, you can verify yourself (or ask a friend who can if you are not able to).<p>This doesn&#x27;t matter unless you build it yourself. Open source hardware and software specs are irrelevant if you have no proof the thing you are using followed them precisely.