While the Bitcoin community is impatiently waiting for Mt. Gox to provide details on the massive hacker attack that stole 6 percent of all the Bitcoin in the world, a group of hackers, who claim to have broken into the bankrupted Bitcoin exchange's servers, said that the company still has at least some of customers' Bitcoins.

According to a Forbes report, the hacker group on Sunday took over the personal blog and Reddit account of Mt. Gox's CEO Mark Karpeles to announce that the exchange has access to a portion of the Bitcoins that the company had said were stolen from customers.

To support the claim, the group uploaded a series of files including an Excel spreadsheet of over a million trades, a screenshot purportedly confirming the hackers' access to the data, a list of Mark Karpeles’ home addresses, his personal CV, and more.

Hackers also point to a balance file, which reportedly shows a balance of 951,116 Bitcoins, to prove that Mt. Gox's claim to have lost customers’ Bitcoins to hackers is nothing but a lie. “That fat fuck has been lying!!”, a note in the file from the hackers reportedly reads.

While the legitimacy of the database dump is yet to be verified, it could also be an accounting mismatch with the company's actual store of Bitcoins, report says. The stolen money hasn't yet appeared on the log of Bitcoin blockchain, the public ledger of transactions that prevents fraud and forgery in the Bitcoin economy, suggesting that whoever has it isn't spending it at the moment.

In another, possibly related event, a user on the BitcoinTalk forum posted a message offering a 20 GB stolen database from Mt. Gox for 100 Bitcoins. According to the user, the database contains Mt. Gox users' personal details and passport scans.