www.alpha-week.com/news/ofac-publishes-cryptocurrency-faqs
www.treasury.gov/resource-center/faqs/Sanctions/Pages/faq_compliance.aspx
www.cftc.gov/PressRoom/SpeechesTestimony/opabehnam5
See also:
goo.gl/LuRJwV
goo.gl/D1V7a2
www.jdsupra.com/legalnews/crypto-never-sleeps-vigilance-required-62663/
Update:
Click to access updateofacsanctionsconsiderationscryptosector.pdf
angle.ankura.com/post/102i75p/preventing-the-use-of-cryptocurrencies-to-evade-sanctions