A public record of Authorized Digital Sellers for a website.
https://iabtechlab.com/ads-txt/
Advertising · ads txt
Get access to data on 830,099 websites that are Ads.txt Customers. We know of 372,173 live websites using Ads.txt and an additional 457,926 sites that used Ads.txt historically and 269,006 websites in the United States.
Get a list of 830,099 websites using Ads.txt which includes location information, hosting data, contact details, 2,463,784 currently live websites which includes 2,091,611 domains that redirect to sites in the list. 457,926 sites that used this technology previously and 269,006 websites in the United States currently using Ads.txt.