Mumbai, April 19 -- The Mumbai zonal unit of the Enforcement Directorate (ED) has provisionally attached assets worth Rs.97.79 crore of businessman Ripu Sudan Kundra, also known as Raj Kundra, husband of Bollywood actor Shilpa Shetty, as part of its money-laundering investigation related to the alleged Rs.6,600 crore bitcoin-based Ponzi scheme operated by a Singapore-based firm, Variable Tech Pte Ltd. Kundra is under the ED scanner for allegedly being a recipient of a part of the proceeds of crime in the case, also known as the Gain Bitcoin Ponzi Scam....