A public record of Authorized Digital Sellers for a website.
https://iabtechlab.com/ads-txt/
Advertising · ads txt
Get access to data on 851,747 websites that are Ads.txt Customers. We know of 168,232 live websites using Ads.txt and an additional 683,515 sites that used Ads.txt historically and 109,831 websites in the United States.
Get a list of 851,747 websites using Ads.txt which includes location information, hosting data, contact details, 1,188,948 currently live websites which includes 1,020,716 domains that redirect to sites in the list. 683,515 sites that used this technology previously and 109,831 websites in the United States currently using Ads.txt.