The world's biggest retailer wants to bring blockchains to the food business
Francis Tseng

Beijing, China I'm at Walmart's global food safety collaboration center, housed in a nondescript office tower downtown, on a rainy Beijing summer day. I meet with Frank Yiannas, VP of food safety at Walmart. He's fresh off a flight from Bentonville, Arkansas-Walmart's headquarters-and is in Beijing for a quarterly meeting of the board that oversees...