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Feb 18, 2024
Authorized Digital Sellers, or ads.txt is an IAB Tech Lab initiative that helps ensure that your digital ad inventory is only sold through sellers (such as AdSense) who you've identified as authorized. Creating your own ads.txt file gives you more control over who's allowed to sell ads on your site and helps prevent counterfeit inventory from being presented to advertisers.

Use of ads.txt is not mandatory, but it's highly recommended. It can help buyers identify counterfeit inventory and help you receive more advertiser spend that might have otherwise gone toward that counterfeit inventory.