Big banks' December victory on swaps rules turned Dodd-Frank into a lightning rod, making additional changes to the law more difficult.

State officials determined they have authority under current law to regulate virtual currencies; now they're considering whether and how to do so.

State officials determined they have authority under current law to regulate virtual currencies; now they're considering whether and how to do so.

Mt. Gox, an online exchange for the virtual currency, goes offline without warning or explanation; customers wonder whether bitcoins they purchased will ever be retrievable.

Mt. Gox, an online exchange for the virtual currency, goes offline without warning or explanation; customers wonder whether bitcoins they purchased will ever be retrievable.

New York and California are taking different approaches, but their final decisions on regulation of bitcoins are likely to set the tone for the rest of the U.S.

New York and California are taking different approaches, but their final decisions on regulation of bitcoins are likely to set the tone for the rest of the U.S.

U.S. Consumer Financial Protection Board looks into lending practices of the company's Bill Me Later service.