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Author Topic: What is Ads.txt , What Problem Does It Solve and How Does It Work?  (Read 1112 times)

Offline Mr. Babatunde

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What is Ads.txt?

Ads.txt is an initiative developed by the IAB Tech Lab, aimed at combating certain types of ad fraud, mainly domain spoofing and illegitimate inventory arbitrage, and providing transparency in what is a highly opaque industry.

Released in May 2017, the ads.txt project is designed to clean up the online-advertising supply chain, help brands and advertisers purchase authentic digital media with confidence, and make it harder for fraudsters to profit from selling inventory that doesn’t belong to them.

While ads.txt revolves around advertising, the ads part is actually an acronym that stands for Authorized Digital Sellers.

What Problem Does Ads.txt Solve? ::)

In particular, ads.txt aims to tackle domain spoofing (a type of ad fraud) and arbitrage, which isn’t exactly ad fraud, but is still a shady practice. Arbitrage is a process in which impressions are bought and then repackaged and resold at a higher price by a third party. Ads.txt helps to solve this problem by indicating who the authorized resellers of a publisher’s inventory are.

Domain spoofing, also known as domain hijacking, works in two ways—either by using malware that’s been installed on a user’s computer or by changing the URL in an ad tag.

Both methods produce the same result in that they trick ad exchanges and other programmatic platforms into thinking that the user is visiting a legitimate site, when in fact the ad will actually appear on a different, illegitimate site or displayed on a page in a hidden web browser.

Piracy sites, websites riddled with bot traffic, and other shady websites often use domain spoofing as a way to monetize sites that would otherwise be blacklisted or ignored by advertisers and brands.

The reason this fraudulent practice has existed for so long is because it’s hard for advertisers to confirm that the information passed in the bids is correct, meaning they can’t verify if their ads actually appeared on the sites they say the ads did.

Now, thanks to ads.txt, domain spoofing and selling illegitimate inventory have become a lot harder.


First, a publisher adds an ads.txt file containing information about all the programmatic partners (supply-side platforms, ad exchanges, ad networks, etc.) that they work with to their web server and hosts it under their root domain.



Let’s take a closer look at the information in the ads.txt file and uncover what it all means.


Partner1, 678910, DIRECT, g45tg4e # banner


Partner1 – The AdTech platform the publisher uses to sell their inventory. Examples include appnexus.com, bidfluence.com, rubiconproject.com, doubleclickbygoogle.com, and pubmatic.com.

678910 – This field represents the Seller Account ID, which is also the publisher’s account ID for the respective AdTech vendors, and is used to verify the authenticity of the inventory during RTB auctions.

DIRECT / RESELLER – Direct means that the publisher works directly with the AdTech vendor to sell its inventory. Reseller means that the publisher has authorized another company (an ad network or digital advertising agency) to sell its inventory on its behalf.

g45tg4e – This optional field lists the Certification Authority ID, which identifies the advertising system within a certification authority, for example, the Trustworthy Accountability Group (TAG).

# banner – Some publishers include this extra field so they know which type of inventory the AdTech vendor sells (view cnn.com/ads.txt to see examples). As this hashtag represents a comment, it won’t be picked up by the crawling script unless certain configurations are made to it, but as this is purely for the publisher’s benefit, there’s no real need for buyers to have this information.

You can manually check to see if a website has an ads.txt file and view its contents by adding /ads.txt to the end of the root domain, e.g. businessinsider.com/ads.txt

Once a publisher has added the ads.txt file to their root domain, brands and advertisers can use a Python script to crawl the web (via a database they’ve created containing a list of domains) and see which publishers have an ads.txt file under their domain.



Once a brand or advertiser has a list of publishers that use ads.txt, they can reference this list against IDs in OpenRTB bid requests.

If the Seller Account IDs match, then the buyers (i.e. brands and advertisers) know that the publisher is who they say they are. If they don’t match or don’t exist, then it could mean that the domain is not coming from an authorized dealer or that the publisher hasn’t implemented ads.txt, and the buyers can choose not to bid on that particular inventory.

Ads.txt is an effective solution to combating domain spoofing because the publisher is the only one that can add the ads.txt file to its domain, meaning it can’t be altered by a different site and used to sell counterfeit inventory.

Is Ads.txt Being Adopted by Publishers?

Initial reports suggested that the ads.txt project wasn’t being adopted at the rate most would expect, considering it’s a pretty straightforward process and eliminates one of the biggest problems in AdTech.

Source - clearcode. cc














 

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