Bankrupt Japanese firm MtGox said in a filing that it has found 200,000 lost bitcoins- worth around $116m - in an old digital wallet from 2011. MtGox, formerly the world's largest bitcoin exchange, filed for bankruptcy in February, after it said it lost thousands of bitcoins to hackers.

Although MtGox had originally said that its "old-format" wallets no longer held any bitcoins, on March 7 confirmed that such a wallet which was used prior to June 2011 held a balance of approximately 200,000 bitcoins.

The firm moved the found bitcoins to offline wallets on 14 and 15 March so that they could not be targeted.

MtGox recently won brief bankruptcy protection in the US as the firm's case works its way through Japanese courts.