Ads.txt (Authorized Digital Sellers) is a mechanism that enables content owners to declare who is authorized to sell their ad inventory. It’s the formal list of advertising partners you support as a publisher.
If you are a current member of the WordAds program and you’ve customized the ads.txt file on your site, you may not be reaching your maximum earning potential. Advertising buyers actually block sites that are missing buyers’ ads.txt data, so it’s very important to keep this file current.
Please note: if your site is a a subdirectory site, then Ads will not work. You will need to purchase a plan with WordAds for the main site, then follow the below instructions.
To maximize the revenue you’re generating, you can configure Jetpack to control your ads.txt file — that way, the list of approved partners updates automatically, while you save time you can better invest in running your business or creating new content. Here’s how:
- Make sure that you’re running the latest version of Jetpack from Dashboard → Updates.
- Head to <your-site-url>/ads.txt, and copy the custom entries you find there.
- Go to your site’s Ads section at Jetpack → Settings → Traffic, and paste those entries into the Custom ads.txt entries field.
- Click the blue Save Settings button at the top of the Ads section when you’re done.
- Confirm that there is no ads.txt file at the root of your site. If another plugin is trying to manage your ads.txt file, disable the plugin.
Jetpack 
Great post! Perfect explanation overall. Thanks for sharing!
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Wow Nice Guide let me try it. I hope it also works on managed word press hosting. Thanks
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