An anonymous reader shares a Reuters report: China's central bank launched spot checks on leading bitcoin exchanges in Beijing and Shanghai, ratcheting up pressure on potential capital outflows and knocking the price of the cryptocurrency down more than 12 percent against the dollar. The People's Bank of China said its probe of bitcoin exchanges BTCC, Huobi and OKCoin was to look into a range of possible rule violations, including market manipulation, money laundering and unauthorized financing. It did not say if any violations had been found. Chinese authorities have stepped up efforts to stem capital outflows and relieve pressure on the yuan. While the yuan lost more than 6.5 percent against the dollar last year, its worst performance since 1994, the bitcoin price has soared to near-record highs.