Re: How can you verify the randomness that's coming from a hardware?
⭐ Merited by vapourminer (1)
yes it is but that's a really complicated process and i wouldn't recommend anyone to try it. they might end up with something that doesn't even work right and has low entropy! 
probably because it is a real pain to make them and they would have to charge so much that no one would buy it they would just buy something like this: https://www.amazon.com/TrueRNG-V3-Hardware-Random-Generator/dp/B01KR2JHTA
i heard someone made one using a geiger counter and detecting radiation. not sure how hard that is to diy. but maybe it's simpler than this zener diode thing.
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I just made a quick web search and seriously surprised that there's no ready-made PCB / DIY kit or similar, that you can plug in and get randomness e.g. through cat /dev/tty.usbrandomdevice.
probably because it is a real pain to make them and they would have to charge so much that no one would buy it they would just buy something like this: https://www.amazon.com/TrueRNG-V3-Hardware-Random-Generator/dp/B01KR2JHTA
i heard someone made one using a geiger counter and detecting radiation. not sure how hard that is to diy. but maybe it's simpler than this zener diode thing.