Possibly viewing Bitfloor, a popular Bitcoin exchange, as a risky money transmitting business, Capital One Financial Corp. has closed the exchange's bank account, prompting Bitfloor to halt operations. The incident may portend a growing wariness of businesses that handle virtual currencies.

Bitcoin, an anonymous digital currency, developed a following among consumers and businesses that were dissatisfied with the restrictions imposed on regulated banks and money transmitters. Even with the proper licensing, Bitcoin businesses still have a reputation as risky companies and are frequent targets of hackers.

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