First they ask you to fund an account with certain amount of Bitcoin, promising you’ll double it in 14 days. According to them, the profits should be generated thanks to their special forex trading skills. Then, once you send your coins, they deliver a very problematic email. It says that for some reason your transaction look suspicious, and that in order to process it they need a confirmation. They ask for many documents to “prove” your transfer. Of course it’s just a way to buy time and you don’t get any money eventually. So in addition to take your money without any return, they continue with fraudulent activity after stealing your identity.