Japan’s government wants to start taxing Bitcoin, amid growing concern the digital currency could be used for tax evasion or money laundering. The shroud of mystery over its founder remains – reporters descended on the home of a Japanese-American engineer, revealed to be the man behind Bitcoin. Satoshi Nakamoto denied any involvement in the controversial currency. Plus: a $9bn deal to buy the Safeway grocery chain, an anti-trust probe into a telecoms merger, and who’s spying on Oreos?