OKEX has a comparatively high standard among cryptocurrency exchanges for exactly who can participate. OKEX is not currently available for citizens of Hong Kong, Cuba, North Korea, Iran, Crimea, Sudan, Malaysia, Syria, the USA and its territories, Bangladesh, Ecuador, Bolivia, and Kyrgyzstan. These countries are either on the United Nations Security Council Sanctions List or its citizens are restricted or prohibited from trading platforms in some way. In the case of the United States, cryptocurrencies still very much occupy a legal gray area. The issue hinges on whether cryptocurrencies can be classified as securities, and it has largely been decided on a case-by-case basis. Exchanges that offer multiple coins – that is, all of them – are thus in danger of running afoul of the U.S. Securities and Exchange Commission if they don’t take steps to prevent U.S. citizens from operating on their exchanges.