Greg Hunter has had guest interviews that mention crypto-currencies, but that is about as far as it goes. I have followed Greg Hunter's interviews and news wrap-ups for many years. Greg is far more of a gold and silver bug than a fan of crypto-currencies at this time.

Greg Hunter is a friend and fan of Gregory Mannarino. I too follow Gregory Mannarino (@marketreport). When Gregory got into crypto-currencies and started posting on SteemIt I was hoping Greg Hunter would soon follow. But it did not happen.

To answer your question directly, I do not recall an interview conducted by Greg Hunter discussing cryptography.

Have a great weekend!
Steem on,
Mike