How to activate Ads.txt file for Blogger adsense website with ads

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Last Months Google Adsense Official has offered to blogger adsense publishers for adding ads.txt in blogger blogsite after offered Search Console Beta Version for real data for website monetize adsense.

What is ads.txt file? Ads.txt is authorized Digital Seller made by IAB Project. What for? To transparency in programmatic advertising.
Adsense publisher can upload file ads.txt to blogger blog to identify who authorize to sell inventhory.
Google said that is not mandatory but is highly recomended to adsense publisher to place ads.txt file to their blogger dashboard. So what function for? Google said that if you place it, it can help you protect your brand from conterfeit inventory in app, website an video like ads invalid Cliks, etc.
How to set up and activate ads.txt file in blogger? For general wordpress, blogger and other cms for adsense website monetize use

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Pub-id is publisher id. Change pub-000000000 with your pub-id in adsense. To know your pub id go to adsense dashboard click setting > Account > Account Information, your pub id there.

For simple you can go to blogger dashboard earnings > publisher id there.
You can ceck that your publisher id has activate go to url https/http://your-domain.com/ads.txt.