| MtGox bitcoin exchange chief executive Mark Karpeles arrested in Japan |
Japanese police have arrested the chief executive of the failed company MtGox, which was once the world's biggest exchange of the virtual currency bitcoin.
Mark Karpeles is being held in connection with the loss of bitcoins worth nearly $US400 million, which prompted the company's collapse in February last year.
The 30-year-old is suspected of manipulating data on the exchange's computer system in 2013 to artificially create about $US1 million.
It was not immediately clear if there would be more charges against Karpeles, who reportedly denied the allegations.
The global virtual currency community was shaken by the shuttering of MtGox, which froze withdrawals in early 2014 because of what the firm said was a bug in the software underpinning bitcoins that allowed hackers to pilfer them.
Police said investigators suspect Karpeles knew details about the missing bitcoins which were reportedly transferred to an account controlled by him without notifying depositors, local media reported.
Police suspect that Karpeles repeatedly transferred clients' bitcoins into his own account for speculative trading.
he exchange — which once handled around 80 per cent of global bitcoin transactions — filed for bankruptcy protection soon after the cyber-money went missing, admitting it had lost 850,000 coins worth $US387 million.
They were worth about $US480 million at the time of the disappearance.
Karpeles later said he had found some 200,000 of the lost bitcoins in a "cold wallet" — a storage device such as a memory stick that is not connected to other computers.
Calls to regulate bitcoin
Bitcoins are generated by complex chains of interactions among a huge network of computers around the planet and are not backed by any government or central bank, unlike traditional currencies.
Investors in the Tokyo-based exchange have called on the firm to publicise its data so that hackers around the world can help analyse what happened at MtGox.
"They seem to refuse to make public more precise information about MtGox's own [information] and how and when it was stolen, if it was really stolen," a French investor told AFP last year at a creditors' meeting.
Karpeles had reportedly refused to travel to the United States, where he was being asked to appear for questioning in connection with MtGox's collapse.
Regulators have scrambled to respond to the use of bitcoin, with some calling for caution until rules are developed to stop them being abused.
Launched in 2009 by a mysterious computer guru, bitcoin offers a largely anonymous payment system and can be stored either virtually or on a user's hard drive.
Backers say virtual currencies allow for an efficient and anonymous way to store and transfer funds online.
But regulators argue the lack of legal framework governing the currency, the opaque way it is traded and its volatility make it dangerous.
After trading for cents per bitcoin for the first two years of its existence, the currency began a frenzied climb in 2011 that took it to $US40 a coin the following year and to $US1,100 in 2013.
Bitcoin is currently trading at around $US280 ($380).
Bitcoin's reputation was also damaged when US authorities seized funds as part of an investigation into the online criminal enterprise Silk Road.
In May, American Ross Ulbricht was convicted of masterminding Silk Road, which sold $US200 million worth of drugs to customers all over the world using bitcoin.
During his trial, a witness said investigators once suspected Karpeles of running the online black market — a claim he subsequently denied.
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