It’s too late to invest in Airbnb, but a company that bills itself as the Airbnb of cloud computer storage is raising cash and anyone with an Internet connection can get in on the action. Storj Labs is selling digital coins at 50 cents apiece to raise $30 million in an early-stage financing round. In just five days, hundreds of contributors signed up for a piece of what they hope will be the next Silicon Valley unicorn.