The Grand Mufti of Egypt has explicitly prohibited trading in Bitcoin, explaining that it is forbidden in Islamic Shari for the risks it holds, and its been used to fund terrorists.
They said it is the currency that is been used directly to fund terrorists and has no set rules, which is considered as a contract annulment in Islam, that is why it is forbidden. To learn more go read it for yourself see link below.
http://www.africanews.com/2018/01/02/top-egyptian-cleric-forbids-muslims-from-bitcoin-trading/
