Is okcoin legal in the USA?

I'm curious about the legality of Okcoin in the United States. As a cryptocurrency enthusiast, I'm always looking for reliable and secure platforms to trade my digital assets. However, I've heard conflicting reports about the status of Okcoin in the US market. Can you clarify whether or not Okcoin is legal for US citizens to use? Additionally, are there any specific regulations or restrictions that I should be aware of when it comes to trading on Okcoin if I'm located in the USA?