A public record of Authorized Digital Sellers for a website.
https://iabtechlab.com/ads-txt/
Advertising · ads txt
Get access to data on 1,010,096 websites that are Ads.txt Customers. We know of 264,482 live websites using Ads.txt and an additional 745,614 sites that used Ads.txt historically and 179,039 websites in the United States.
Get a list of 1,010,096 websites using Ads.txt which includes location information, hosting data, contact details, 264,482 currently live websites and an additional 1,145,353 domains that redirect to sites in this list. 745,614 sites that used this technology previously and 179,039 websites in the United States currently using Ads.txt.