At 30, Andrew Bull is young for a law firm founder. But the blockchain technology his firm specializes in is much younger.

Bull’s new Philadelphia law firm, Bull Blockchain Law, officially opened its doors a little over a month ago. It’s not the first time he has launched a business rooted in the burgeoning area of blockchain technology. He founded a cryptocurrency mining company just a few years ago, which he recently closed, and worked on a digital asset fund, which Bull said is comparable to a hedge fund, but with cryptocurrency.