After a disappointing debut in June, Google released an updated version of its sellers.json file mid-october. Sellers.json is a mechanism developed by the IAB Tech Lab that buyers can use to verify which exchanges and SSPs are authorized to sell a publisher’s inventory. Google’s expanded file now includes information for 1.2 million publishers, and support for all publishers selling through AdSense, AdMob and Ad Manager. Complaints about Google’s first stab at sellers.json centered on the fact that the file included only a fraction of its publisher base. And of the publishers that were included, many were missing domain names and/or had their business name listed as confidential.