...Plagued by two hacking incidents last year, Vircurex previously pledged to cover its users’ losses via its own income. Due to “large fund withdrawals in the last weeks,” Vircurex claims it has taken the above actions to prevent the service from shutting down entirely. ...This news follows the catastrophic shutdown of Mt. Gox, once the largest Bitcoin exchange in existence, on Feburary 25. Other prominent exchanges have ended in sudden shutdowns, including Flexcoin on March 5, and Crypto-Trade on February 27.