Justin Kan's new legal startup, Atrium, has snatched up $65 million in a new round of funding led by Andreessen Horowitz. Kan is perhaps best known as the creator of modern live-streaming with the launch of Twitch, which sold to Amazon for nearly $1 billion. He aims to repeat his success with Atrium. Andreessen Horowitz's Andrew Chen said Kan's boldness is part of the reason the investor has so much faith in Kan as a founder.