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https://5pillarsuk.com/2018/01/27/video-dr-haitham-al-haddad-declares-bitcoin-and-all-cryptocurrency-haram/
2. AAOIFI. (2016). AAOIFI Shariah Board Adopts New Shariah Standards on Gold. Available at:
http://aaoifi.com/announcement/aaoifi-shariah-board-adopts-new-shariah-standards-on-gold-and-liability-of-investment-manager/?lang=en
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https://www.alaraby.co.uk/english/blog/2017/12/6/digital-currency-bitcoin-forbidden-in-islam-rules-saudi-cleric
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https://www.alaraby.co.uk/english/news/2018/1/4/egypts-grand-mufti-issues-fatwa-against-bitcoin
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https://www.bis.org/cpmi/publ/d174.pdf