Re: How can you verify the randomness that's coming from a hardware?
what's wrong with using RDRAND or RDSEED? i know there's people that have a conspiracy theory that those are having a backdoor but it's intel. come on! bonus points is, if you have a modern computer, you're good to go.
YOu are digging up moths old topic from death and than you are speaking nonsense like this 
It's no conspiracy theories, it's well know fact that Intel has hidden operating system inside that is called Intel Management (AMD has it's own version) and they are sending information all the time.
Only way I know that people managed to mitigate this threat is with flashing open source firmware Coreboot, but you need to use second device for that, and it's not exactly newbie friendly procedure.
Even if we disregard that, bottom line is that this is not giving true random results.