Ads.txt (Authorized Digital Sellers) is a concept from the Interactive Advertising Bureau (IAB) that aims to help your digital advertising inventory only be sold through authorized sellers (Google Adsense. Ads.txt proves that your website is a verified web as a listing of Google Adsense partnerships
As I explained above, Ads.txt aims to verify your website if when you register Adsense with a Gmail account that is not for Blogger login, but if you register Adsense via daskboard Blogger then you do not need to activate Ads.txt, because Ads. txt will be verified automatically. Also read : How to submit the article "Fetch As Google" so that the link is quickly indexed.
To check active or not Ads.txt you can use the link http://www.domain.com/ads.txt. Change the domain name with your website address. If your ads.txt is active and verified will appear google.com, pub-0000000000000000, DIRECT, f08c47fec0942fa0. But if your Ads.txt is not active, there will be an error 404.
HOW TO ACTIVATE ADS.TXT IN BLOGGER
Step 1 : Enter the Google Adsense dashboard then you see the Google Adsense ID Publisher through menu >> Setting >> Account >> Account Information >> See the top Adsense Publisher ID. Also read : How to get money on the internet for additional income.
Step 2 : Enter the Blogger Dashboard >> Settings >> Search Preferences >> Monetization >> Custom Ads.txt >> Click edit and copy the following code : google.com, pub-0000000000000000, DIRECT, f08c47fec0942fa0 (Change the 0000000000 number with your Adsense ID).
Enabling this Ads.txt makes the ads that appear on your website not empty. Finish how to verify Ads.txt on the blog, if you are still confused please comment on this blog and I will help.