WazirX, one of India’s largest cryptocurrency exchanges, has “temporarily” suspended all trading activities on its platform days after losing about $230 million, nearly half of its reserves, in a security breach. The Mumbai-based exchange said in a tweet Sunday evening that the cyber attack had substantially impaired its ability to maintain the critical 1:1 collateral ratio with assets, a move that raises more concerns about the adequacy of WazirX’s reserves and its ability to fully reimburse it...