Ads.txt is an initiative from The IAB Tech Lab. The main goal to increase transparency in the programmatic advertising ecosystem. It is a simple method for publishers to declare who is authorized to sell their digital inventory.
The publisher puts a text file on his web server on the root level of the domain, it must be called ads.txt, and it must have its Read permissions set to “World”. The file must follow the IAB format (see below).
The file should list all of the companies that are authorized to sell the publishers’ inventory. This page will be crawled by DSPs and the information will later be checked against incoming bid requests to validate that the advertising system the ad request is coming from is authorized to sell the publisher's inventory.
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