Authorized Digital Sellers or Ads.txt, is an IAB-approved text file that aims to prevent unauthorized inventory sales in order to improve transparency in programmatic advertising.

Publishers can create their own ads.txt files to identify who is authorized to sell their inventory. This allows buyers to check the validity of the inventory they purchase. The files are publicly available and crawlable by exchanges, Supply-Side Platforms (SSP), and other buyers and third-party vendors.

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