Bitconnect was an exchange and an open source Bitcoin based cryptocurrency it was one of the most successful cryptocurrencies  by price until the beginning of  the year 2018 . It became unfamous when the Thailand conference appeared in you tube displaying an unreal behaviors from a guest speaker and after that the exchange collapsed . The Bitconnect coin was among the top 20 successful cryptocurrency tokens now the Bitconnect is saying that it has come under cyber attack .