Ads.txt (Authorized Digital Sellers) is a solution protecting ad buyers from ad fraud by IAB (Interactive Advertising Bureau).
It is a text file published by a website or mobile app declaring the authorized sellers. The buyers can check who is authorized to sell their inventory if the inventory is coming from the publisher.
Ads.txt is important for programmatic buying and selling for a clean supply chain. It protects the buyers from domain spoofing, also protects the publishers’ brand.
<Field #1>, <Field #2>, <Field #3>, <Field #4>
Comments start with # is will be ignored.
A website or mobile owner can put ads.txt at the root domain, update it when required.
Or a better solution is to use Ads.txt manager. The Ads.txt manager like adstxt.dev makes the life of adops easier. It is not necessary to going through the development cycle to change the ads.txt file on the website, the content of Ads.txt can be updated anytime.
Google allows advertisers to buy ads.txt authorized-only inventory.
Display & Video 360 buyers can opt in to exclude publishers that have not published ads.txt files.
“From the end of October 2017, DoubleClick Bid Manager (DBM) only buys inventory from sources identified as authorized sellers in a publisher’s ads.txt file, when a file is available. ads.txt may become a requirement for DBM.”