A public record of Authorized Digital Sellers for a website.
https://iabtechlab.com/ads-txt/
Advertising · ads txt
Get access to data on 870,827 websites that are Ads.txt Customers. We know of 137,026 live websites using Ads.txt and an additional 733,801 sites that used Ads.txt historically and 90,517 websites in the United States.
Get a list of 870,827 websites using Ads.txt which includes location information, hosting data, contact details, 137,026 currently live websites and an additional 967,510 domains that redirect to sites in this list. 733,801 sites that used this technology previously and 90,517 websites in the United States currently using Ads.txt.