The IAB Tech Lab created the Authorized Digital Sellers Ads.txt project to eliminate the ability to profit from counterfeit inventory by increasing transparency to buyers of who you authorize to transact on your inventory.


What is Ads.txt

To combat fraud, the industry has adopted ads.txt which allows publishers to publicly declare the companies they authorize to sell their digital inventory. This record at the root domain of the site makes it harder for counterfeit inventory to be transacted across the ecosystem.

"Ads.txt is a simple, flexible, and secure method for publishers and distributors to declare who is authorized to sell their inventory, improving transparency for programmatic buyers." - IAB Tech Lab

Why do I need Ads.txt

Advertisers are transitioning to purchase only on Ads.txt inventory to make sure they are buying only authorized inventory. If the file is absent of any valid records declaring authorized systems, then the buyers can assume that no advertising system is authorized to buy and sell ads on the website.


How does it work?

Only the website admin is able to edit the root files of the website which makes it reliable because the text file cannot be changed by anyone other than you. This otherwise un-editable file lists only the people you approve to buy your inventory.

In the example below, each of the green boxes is an authorized seller that you work with. The ads.txt box on the far left represents a single line in your actual ads.txt file indicating to the supply chain which players you have authorized to transact on your inventory. Your ads.txt file includes the full list of your authorized partners and is crawled by the DSP so that the buyer has transparency of who you authorize to work with your site. This gives an added layer of safety to the buyer because the supply chain knows the site indicates only specific partners, so it helps combat counterfeit inventory. 

*Source: IAB Tech Lab


How do I implement Ads.txt  

In the dashboard under your domain, then "Ads.txt File Manager" you can find the most up-to-date ads.txt file to implement.

  • Host your file at the top-level of the domain’s file structure aka root level for your domain by your webmaster or development team. IE:  https://yourdomain.com/ads.txt 
  • Encode the data as a formatted plain text object


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