As of November 8th, Google’s advertising platforms filter all unauthorized ad inventory identified by published ads.txt files:
- Marketers and agencies using DoubleClick Bid Manager and AdWords will not buy unauthorized impressions as identified by publishers’ ads.txt files.
- DoubleClick Ad Exchange and AdSense publishers that use ads.txt are protected against unauthorized inventory being sold in our auctions.
Preventing the sale of unauthorized inventory depends on having complete and accurate ads.txt information. So, to make sure our systems are filtering traffic as accurately as possible, we built an ads.txt crawler based on concepts used in our search index technology. It scans all active sites across our network daily, over 30m domains, for ads.txt files, to prevent unauthorized inventory from entering our systems.