Last updated Feb 9, 2026 by AI Enrichment
On August 15, 2022, the IAB Tech Lab released version 1.1 of the ads.txt (Authorized Digital Sellers) specification, marking a significant update to the industry standard first introduced in 2017. The ads.txt initiative allows publishers to publicly declare which companies are authorized to sell their digital inventory, creating a transparent record that buyers can verify before purchasing ad space. Version 1.1 introduced enhancements to improve supply chain transparency and strengthen protections against unauthorized inventory sales and domain spoofing. The update built upon the widespread adoption of ads.txt across the digital advertising ecosystem, where the standard had become a critical tool for combating ad fraud and ensuring inventory authenticity. By 2022, ads.txt had been implemented by a majority of publishers and was regularly checked by demand-side platforms and advertisers to verify legitimate inventory sources. The 1.1 release represented the IAB Tech Lab's continued commitment to evolving the standard in response to emerging fraud tactics and industry feedback, maintaining its relevance as fraudsters developed more sophisticated methods to circumvent transparency measures.
The release of ads.txt 1.1 reinforced the IAB Tech Lab's position as the primary standards-setting body for programmatic advertising transparency and fraud prevention. The update demonstrated the industry's ongoing commitment to supply chain integrity at a time when ad fraud remained a multi-billion dollar problem. By continuously improving the ads.txt standard, the IAB Tech Lab helped maintain buyer confidence in programmatic channels and supported publishers' ability to protect their brand reputation and revenue streams. The evolution of ads.txt also influenced related transparency initiatives like sellers.json and SupplyChain object (chain object in OpenRTB), creating a more comprehensive framework for supply path optimization (SPO). The update particularly benefited legitimate publishers by making it harder for fraudulent actors to impersonate premium inventory, while encouraging demand-side platforms and advertisers to implement more rigorous verification processes in their buying workflows.