U.S. Bitcoin wallet Coinbase said it now has more than 650,000 users. In a blog posting, Coinbase said its user numbers have grown nine-fold in the past nine months, having started 2013 at around 30,000 accounts.

On Dec. 12, Coinbase announced it had raised $25 million in a funding round led by Andreessen Horowitz. The funding took the total raised so far by Coinbase to $31 million.

Coinbase said the average number of Coinbase transactions was up more than twenty-fold in November 2013 from January 2013. Nearly 90 percent of Coinbase visitors are male, and more than half of all visitors fall into the 25 to 34 age range, Coinbase said.

Despite the male dominance of Bitcoin users, the percentage of women interested in buying Bitcoin is growing. "The share of women interested in buying Bitcoin rose to 12.5 percent of our total base in November 2013 from 5.8 percent in October 2013," Coinbase said.

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