Wallet software provider Blockchain has opened its three millionth bitcoin wallet, having doubled downloads in less than a year.

The company has seen continued demand since bitcoin’s 2013 price spike, passing the 1.5 million milestone in April. Rival Coinbase currently lists 2.5 million wallets in the wild.

Speaking to CoinDesk, CEO Peter Smith could not confirm how many of Blockchain’s wallet accounts are active (ie contain funds) for privacy reasons. However, he pointed to record-breaking transaction volume as a sign of bitcoin’s user growth.

“You can look to the 140% (approx.) year-over-year growth in the number of transactions powered by our software daily to get a sense for activity, which, as a company focused on making it easy to transact, is really encouraging,” he said.