Delhi Police have arrested SK Masud Alam, a West Bengal-based hacker, involved in the $230 million cyber theft from WazirX.The cyber theft affected 45% of WazirX's total wealth, involving virtual currencies worth about Rs 2,000 crore ($230 million).The investigation suggests internal manipulation involving multiple players rather than malicious attacks on WazirX systems.The role of Liminal Custody, the company for WazirX digital wallets, is under investigation for its response to the requests for information.