Earlier this year IAB revealed ads.txt (Authorized Digital Sellers), a project that aims to increase transparency to the digital ad market. It is promoted as a simple, flexible, and secure method for publishers and distributors to declare who is authorized to sell their inventory.
In layman’s terms publishers can add a simple .txt file to their website with the list of companies through which they sell their inventory. The list is sorted by name and with the publisher’s account ID included. This in turn helps buyers know who is selling publishers inventory programmatically.