A public record of Authorized Digital Sellers for a website.
https://iabtechlab.com/ads-txt/
Advertising · ads txt
Get access to data on 1,222,799 websites that are Ads.txt Customers. We know of 347,996 live websites using Ads.txt and an additional 874,803 sites that used Ads.txt historically and 222,104 websites in the United States.
Get a list of 1,222,799 websites using Ads.txt which includes location information, hosting data, contact details, 347,996 currently live websites and an additional 1,146,161 domains that redirect to sites in this list. 874,803 sites that used this technology previously and 222,104 websites in the United States currently using Ads.txt.