As per present time many world leaders are thinking to Regulate crypto currencies as on world wide bases and also talking for realesed own country's own Crypto currencies but How can regulated it as on worldwide base 
I think there's no such thing as worldwide regulation instead each country that was adopting cryptocurrencies have their own piece of regulatory requirements like my country, cryptocurrencies are not banned instead they have categorized it if it is a "security or not a security" and those crypto base firm must get necessary requirements issued by SEC for securities or the Central Bank for non-securities, that was the initial requirements, for now, to be able to operate in my country.