Ooff. Bitcoin, a system not based on a usury system, is Fatwa’d in 2018. 

https://english.ahram.org.eg/NewsContent/3/12/286399/Business/Economy/Bitcoin-trading-is-unlawful-pursuant-to-Islamic-Sh.aspx

I wonder if the grand mufti is keeping in mind what happened to Ghadafi after his gold standard pursuit.