FORTUNE — Tim Chang has a very busy full-time job as a partner with venture capital firm Mayfield, where he has led investments in such companies as Lyft, Lumosity and Playdom. But he also has a business venture on the side, helping friends and family invest in bitcoin via something called Binary Fund.
Binary Fund was formed by a Canadian investment firm called Binary Financial, and also includes participation from venture capitalist Jon Teo (ex-General Catalyst who is forming a new fund of his own). The idea is basically to participate in bitcoin arbitrage, as opposed to investing in bitcoin-focused startups.