Fearful of the future, Europeans are moving their money out of their banks and dumping it into safe havens such as U.S. Treasuries, Government of Canada bonds — and apparently the virtual currency Bitcoin.

“European volume has been skyrocketing,” said Charlie Shrem, chief executive of BitInstant LLC, a company in New York that enables clients to transfer funds between Bitcoin and U.S. and Canadian dollars, British pounds, euros and other major currencies.

According to Mr. Shrem, the sudden rise has been driven by people in countries like Greece, Italy, Spain — and even the Netherlands — anxious to protect their savings.