The price of bitcoin may be on the decline, but that hasn’t stopped bitcoin startups from attracting significant funding. Blockchain, the most popular Bitcoin wallet service, announced Tuesday that it has raised $30.5 million in a Series A round, marking one of the largest funding rounds of any bitcoin startup to date. The bitcoin startup was founded three years ago, but had never taken outside investment. Even so, it managed to build up a user base of more than 2 million wallets.