A UK company has been linked to the laundering of 650,000 stolen bitcoins worth £4.5bn, a BBC Radio 4 investigation has found.
The coins were taken by hackers from Tokyo-based Bitcoin exchange Mt Gox, leaving tens of thousands of customers out of pocket.
It’s not clear who is in control of the London-based firm Always Efficient LLP.
Mt Gox operator Mark Karpeles apologised to investors and said he was co-operating with the investigation.
The FBI has charged a Russian national with laundering the stolen bitcoins.
Mt Gox matched up those who wanted to buy the crypto-currency with dollars, pounds and other international denominations with those wanting to sell bitcoins, and handled an estimated 70% of the world’s Bitcoin trade.
The exchange was originally set up to trade cards from a game set in a world of wizards, spells and monsters. When it turned its focus to crypto-currencies, it appeared to be a huge success story.