MUMBAI, April 19 -- The Enforcement Directorate (ED) has provisionally attached assets worth Rs.97.79 crore belonging to businessman Raj Kundra, husband of Bollywood actress Shilpa Shetty, as part of a money-laundering investigation into an alleged Rs.6,600 crore Bitcoin-based Ponzi scheme operated by Singapore-based Variable Tech Pte Ltd, officials said on Thursday....