2024 marked a significant year. AI became integral to our workflows, commerce and retail media networks soared, and Google did not deprecate cookies. Amidst these changes, ID bridging emerged as a hot topic, raising questions around identity reliability and transparency, which necessitated industry-wide standards. We believe the latest IAB OpenRTB specifications, produced in conjunction with supply and demand-side partners, set up the advertising industry for more transparent and effective practices.
So, what exactly is ID bridging?
As signals, like third-party cookies, fade, ID bridging emerged as a way for the supply-side to offer addressability to the demand-side. ID bridging is the supply-side practice of connecting the dots between available signals, that were generated in a way that is not the expected default behavior, to understand a user’s identity and communicate it to prospective buyers. It enables the supply-side to extend user identification beyond the scope of one browser or device.
Imagine you visit a popular sports website on your laptop using Chrome. Later, you use the same device to visit the same sports website, but this time, on Safari. By using identity resolution tools, a supply-side partner can infer that both visits are likely from the same user and communicate with them as such.
ID bridging is not inherently a bad thing. However, the practice has sparked debate, as buyers want full transparency into the use of a deterministic identifier versus an inferred one. This complicates measurement and frequency capping for the demand-side. Before OpenRTB 2.6, ID bridging led to misattribution as the demand-side could not attribute ad exposures, which had been served to a bridged ID, to a conversion, which had an ID different from the ad exposure.
OpenRTB 2.6 sets us up for a more transparent future
In 2010, the IAB, along with supply and demand-side partners, formed a consortium known as the Real-Time Bidding Project for companies interested in an open protocol for the automated trading of digital media. The OpenRTB specifications they produced became that protocol, adapting with the evolution of the industry.
The latest evolution, OpenRTB 2.6, sets out standards that strive to ensure transparency in real-time bidding, mandating how the supply-side should use certain fields to more transparently provide data when inferring users’ identities.
What’s new in OpenRTB 2.6?
Here are the technical specifications for the industry to be more transparent when inferring users’ identities:
- Primary ID field: This existing field now can only contain the “buyeruid,” an identifier mutually recognized and agreed upon by both buyer and seller for a given environment. For web environments, the default is a cookie ID, while for app activity, it is a mobile advertising ID (MAID), passed directly from an application downloaded on a device. This approach ensures demand-side partners understand the ID’s source.
- Enhanced identifier (EID) field: The EID field, designated for alternative IDs, now accommodates all other IDs. The EID field now has additional parameters that provide buyers transparency into how the ID was created and sourced, which you can see in the visual below:
Using the above framework, a publisher who wants to send a cross-environment identifier that likely belongs to the same user would declare the ID as “mm=5,” while listing the potential third-party identity resolution partner under the “matcher” field, which the visual below depicts. This additional metadata gives the demand-side the insights they need to evaluate the reliability of each ID.
“These updates to OpenRTB add essential clarity about where user and device IDs come from, helping buyers see exactly how an ID was created and who put it into the bidstream. It’s a big step toward greater transparency and trust in the ecosystem. We’re excited to see companies already adopting these updates and can’t wait to see the industry fully embrace them by 2025.”
Hillary Slattery, Sr. Director, Programmatic, Product Management, IAB Tech Lab
Experian will continue supporting transparency
As authenticated signals decrease due to cookie deprecation and other consumer privacy measures, we will continue to see a rise in inferred identifiers. Experian’s industry-leading Digital Graph has long supported both authenticated and inferred identifiers, providing the ecosystem with connections that are accurate, scalable, and addressable. Experian will continue to support the industry with its identity resolution products and is supportive of the IAB’s efforts to bring transparency to the industry around the usage of identity signals.
Supply and demand-side benefits of adopting the new parameters in OpenRTB 2.6
- Partner collaboration: Clarity between what can be in the Primary ID field versus the EID field provides clear standards and transparency between buyers and sellers.
- Identity resolution: The supply side has an industry-approved way to bring in inferred IDs while the demand side can evaluate these IDs, expanding addressability.
- Reducing risk: With accurate metadata available in the EID field, demand-side partners can evaluate who is doing the match and make informed decisions on whether they want to act on that ID.
Next steps for the supply and demand-sides to consider
For supply-side and demand-side partners looking to utilize OpenRTB 2.6 to its full potential, here are some recommended steps:
For the supply-side:
- Follow IAB Specs and provide feedback: Ensure you understand and are following transparent practices. Ask questions on how to correctly implement the specifications.
- Vet identity partners: Choose partners who deliver the most trusted and accurate identifiers in the market.
- Be proactive: Have conversations with your partners to discuss how you plan to follow the latest specs, which identity partners you work with, and explain how you plan to provide additional signals to help buyers make better decisions.
We are beginning to see SSPs adopt this new protocol, including Sonobi and Yieldmo.
“The OpenRTB 2.6 specifications are a critical step forward in ensuring transparency and trust in programmatic advertising. By aligning with these standards, we empower our partners with the tools needed to navigate a cookieless future and drive measurable results.”
Michael Connolly, CEO, Sonobi
These additions to the OpenRTB protocol further imbue bidding transactions with transparency which will foster greater trust between partners. Moreover, the data now available is not only actionable, but auditable should a problem arise. Buyers can choose, or not, to trust an identifier based on the inserter, the provider and the method used to derive the ID. While debates within the IAB Tech Lab were spirited at times, they ultimately drove a collaborative process that shaped a solution designed to work effectively across the ecosystem.”
Mark McEachran, SVP of Product Management, Yieldmo
For the demand side:
- Evaluation: Use the EID metadata to assess all the IDs in the EID field, looking closely at the identity vendors’ reliability. Select partners who meet high standards of data clarity and accuracy.
- Collaboration: Establish open communication with supply-side partners and tech partners to ensure they follow the best practices in line with OpenRTB 2.6 guidelines and that there’s a shared understanding of the mutually agreed upon identifiers.
- Provide feedback: As OpenRTB 2.6 adoption grows, consistent feedback from demand-side partners will help the IAB refine these standards.
Moving forward with reliable data and data transparency
As the AdTech industry moves toward a cookieless reality, OpenRTB 2.6 signifies a substantial step toward a sustainable, transparent programmatic ecosystem. With proactive adoption by supply- and demand-side partners, the future of programmatic advertising will be driven by trust and transparency.
Experian, our partners, and our clients know the benefits of our Digital Graph and its support of both authenticated and inferred signals. We believe that if the supply-side abides by the OpenRTB 2.6 specifications and the demand-side uses and analyzes this data, the programmatic exchange will operate more fairly and deliver more reach.
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Audigent, a part of Experian, is excited to announce that curated audience and contextual inventory packages are now accessible on Google Display and Video 360 (DV360), delivered via Index Marketplaces. These premium deals offer industry-leading targeting solutions, combining high-quality data and inventory to enhance scale, value, and performance across connected TV (CTV), display, and online video (OLV). The integration launches with over 250 ready-to-run deals covering various sectors, including some available for DV360 buyers for the first time, such as automotive, B2B, seasonal retail, sports fandom, travel, and weather, among others. Each deal combines exclusive audience data with premium inventory under a single DV360 deal ID. The supply-side activation lets you scale campaigns without cookies or device IDs, so results stay consistent even as traditional tracking disappears. "We’re excited to expand Audigent’s curated, data-enriched packages in DV360 with Index Exchange. Putting Experian’s audiences and Audigent's premium supply inside a single deal ID accelerates smarter decisions for marketers—letting brands activate, test, and see results right away.”Chris Feo, Chief Business Officer, Experian Why these packages stand out Unique targeting and supply packages Each package fuses exclusive data with handpicked inventory and ships as a single, ready-to-trade deal ID. Deep partner bench Audiences are sourced from first-party publisher data as well as data leaders such as Experian, Affinity Answers, Acxiom, Bombora, Circana, Dun & Bradstreet, Resonate, Sports Innovation Lab, The Weather Company, and more, providing buyers with deterministic purchase, intent, behavioral, and lifestyle signals in one flight. Future-proofed addressability Packages rely on Audigent’s identity framework, contextual intelligence, and supply-side data activation rather than third-party cookies or device IDs, keeping reach intact as identifiers fade. Three reasons these packages drive results Signal-agnostic reach: Cookieless, device-less targeting preserves scale today and tomorrow. Instant activation: Traders simply add the pre-curated deal ID to a DV360 line item and go live in seconds. Built-in quality assurance: Exclusive audience data is paired with hand-vetted inventory, so you start closer to KPIs from day one. Direct-to-source media buying that pays off By packaging curated, data-enriched deals directly atop Index Exchange, via the Index Marketplaces platform, Audigent eliminates extra hops and integrates premium partner data into a single price, with no additional data management platform (DMP) fees. That means higher match rates, simplified audience management, and a cleaner, greener path that concentrates spend on top-tier publishers. Paired with Index Exchange’s omnichannel reach, brands see stronger performance and lower waste, no trade-offs required. "Our goal with Index Marketplaces is to streamline access to premium supply, high-quality data, and measurable outcomes. Hosting Audigent's ready-to-run deals on Index lets DV360 buyers tap addressable inventory curated for scale, sustainability, and speed – no extra steps, just better results."Paul Zovighian, Vice President of Marketplaces, Index Exchange Real-world use cases Audigent’s deep data collaboration bench isn’t window dressing; it’s baked into every package. Deterministic signals from Experian and fellow data leaders come pre-loaded, so you tap high-intent, high-match audiences the instant you activate a deal ID. In-market auto shoppers Reach consumers actively researching specific vehicle types, such as compact cars, SUVs, trucks, or luxury models, using deterministic data from Experian. These segments predict purchase intent within the next 180 days, enabling the delivery of accurate messaging at the moment of consideration. B2B account growth Target decision-maker employees at companies segmented by employee count: 11–50, 51–250, or 251+, using Dun & Bradstreet’s data. Or reach small business professionals and business decision-makers via deals utilizing Bombora’s data assets. Sports fandom Engage verified MLB fans based on purchase behavior, powered by Sports Innovation Lab. Extend reach to contextual sports content, including live sports and sports-related programming across CTV and OLV. Seasonal retail bursts Engage gift-givers and in-market segments for gifts and occasions. Target DIY home improvers and verified affinity audiences for home projects. Reach back-to-school families by targeting parents preparing for the school year with Affinity Answers’ event-based segments. Weather-driven behavior Activate campaigns based on how real-time or forecasted weather conditions (like sunny days, outdoor activity suitability, or severe weather alerts) influence mindsets and decisions, powered by The Weather Company's data. "This collaboration integrates The Weather Company’s industry‑leading weather forecast data into DV360, the world’s largest buying platform, enabling real‑time relevance through curated deals. Experian contributes deep expertise in consumer audiences, The Weather Company delivers unmatched precision in timing and location, and Index Exchange adds efficiency and transparency – together creating a streamlined, turnkey solution for activation." Dave Olesnevich, VP of Data and Ad Product, The Weather Company Ready to activate? Search Audigent in DV360’s Marketplace, select the Audigent package that fits your KPIs, and add the deal ID to your line item. Prefer a custom build? Reach out to us at partnershipsales@experian to curate a package tailored to your campaign goals. The quickest path to performance is just one deal ID away. Contact us now Latest posts
Brands want more from their media investments: better insights, more efficient reach, and clear proof of performance. Whether you’re starting with high-quality first-party data or need help reaching new audiences, Experian offers flexible solutions to drive reach among key audiences and to measure the impact. We’ve built two primary activation and measurement solutions tailored to how brands operate, so you can spend less time managing data and more time driving outcomes. Use case 1: First-party insights to activation and measurement Best for: Brands with first-party data looking to deepen their understanding of existing customers, activate intelligently, and measure what matters – all through a single trusted partner. Solution: Audience Engine + Outcomes Audience Engine Audience Engine is our self-service platform designed to help you onboard first-party data, gain key insights into your customers, build custom audiences using our powerful data assets, and activate them across 200+ platforms — all within a single workflow. Outcomes Experian Outcomes closes the loop by measuring real-world results of your campaigns (such as visits, purchases, and website actions) and tying them back to specific media exposures across digital and TV channels. Together, these tools offer a full-funnel audience and measurement solution, from planning and activation to proving performance. Let’s bring this to life A leading athletic retailer partnered with Experian and Yieldmo to drive in-store foot traffic, targeting shoppers likely to buy from their competitors during key sales windows. Using Experian’s Audience Engine, which includes our proprietary and third-party data marketplace, Yieldmo built a high-performing, self-serve targeting strategy for the retailer. By combining Experian Audiences with Partner Audiences from Alliant, Circana, Webbula, and Sports Innovation Lab, Yieldmo was able to build apparel and footwear audiences from the data marketplace including: In-store shopper segments Athleisure purchasers Competitive purchasers Audience Engine also enabled Yieldmo to tap into Experian’s identity graph, expanding cross-channel reach and maximizing campaign scale and precision. And while not used for this campaign, our Outcomes solution allows advertisers to tie media spend to in-store activity, so retailers can measure true business impact. Benefits Understand your customers more deeply To reveal behavioral, demographic, and lifestyle trends. Reach your first-party audiences at scale Across top activation platforms, using Audience Engine’s onboarding capabilities. Increase your brand awareness By reaching prospective audiences, using Experian Audiences, Partner Audiences, and lookalike audiences. Measure campaign effectiveness With Outcomes, which correlates media exposures (digital and/or TV) with offline and online conversions, visits, or sales. Optimize future media buys By using attribution insights to refine targeting, creative, and channel mix based on what’s actually driving results. Use case 2: Activation and measurement Best for: Brands that already know who they want to reach and are looking to activate high-quality, data-driven audiences across their preferred media platforms and want to clearly understand what’s driving performance. Solution: Audiences + Partner Audiences + Outcomes Audiences Experian Audiences are pre-built audience segments grouped by shared attributes from Experian Marketing Data built for activation on-the-shelf of top programmatic, TV, and social destinations like FreeWheel, Magnite, and Madhive, in addition to Audience Engine. Partner Audiences Experian's Partner Audiences are high-quality audience segments sourced directly from 30+ leading third-party data providers like Affinity, Circana, and Dun & Bradstreet. These segments are curated across verticals like Business, CPG, Health, Retail, and Travel, and are available through on top media destinations, in addition to our data marketplace for easy selection and deployment. Outcomes Experian Outcomes helps close the loop by tying real-world results back to media exposures across digital and TV channels. Together, these products empower marketers to activate smarter and prove success with confidence. Let's bring this to life A leading fashion brand set out to grow their customer base by reaching high-intent shoppers where they spend their time: online. Their goal: drive e-commerce conversions through a programmatic campaign powered by The Trade Desk. To do it, they needed more than just reach, they needed accuracy. That’s where Experian came in. On The Trade Desk, the brand quickly discovered Experian’s prebuilt audience segments, readily available and easy to activate. They selected: Age Range: 25–44 Women’s Fashion Frequent Spenders: Households identified as frequent purchasers of women’s apparel, cosmetics, jewelry, and accessories—based on verified, consumer-reported transactions from the past 24 months. These segments gave the brand confidence that it was putting its message in front of the right consumers, those most likely to engage and buy. To understand whether their campaign was driving results beyond impressions, the brand implemented a site pixel to capture both top-of-funnel visitation and bottom-of-funnel conversions. Using Experian’s Outcomes solution, they were able to close the loop—tying ad exposure directly to e-commerce sales. The Outcomes report showed clear campaign lift, highlighting which channels and audience segments performed best. Armed with these insights, the brand refined their targeting and messaging for future media buys—boosting ROI with each iteration. Benefits Reach your ideal audience at scale By activating Experian Audiences and Partner Audiences off the shelf at digital and TV platforms. Access privacy-conscious, diverse data Curated by 30+trusted data providers in verticals like Business, CPG, Health, Retail, and Travel without needing to manage multiple data contracts. Understand what’s working Through Outcomes reporting, which connects media exposure to offline and online outcomes like conversions, purchases, or visits. Continuously improve performance By using attribution insights to inform audience selection, creative strategy, and media channel mix for future campaigns. Bring this to your brand Experian’s activation and measurement solutions for brands gives you the tools to act with clarity: from onboarding your first-party data to reaching new customers and tying media back to real results. Whether you’re starting with deep customer insights or building campaigns from scratch, here’s how our solution helps: Audience Engine Onboard your first-party data, gain insights into audience composition, build custom audiences using Experian and Partner Audiences, and activate them across 200+ leading platforms — all through a centralized, self-service platform. Audiences and Partner Audiences Reach high-intent prospects using Experian’s syndicated audiences or custom-built segments from partners like Circana, Dun & Bradstreet, and more. Outcomes Understand what worked. See how media exposure correlates with actions like store visits, quote requests, site activity, or purchases. Every element is built to help you scale campaigns, improve addressability, and tie media spend to results that matter—without the overhead of multiple vendors or disjointed systems. Ready to see it in action? Get in touch with our team. Latest posts
1,000+ ready-made segments, available for activation within Nexxen Audigent, a part of Experian, has officially launched its audiences in the Nexxen demand-side platform (DSP), pairing premium publisher audiences with Nexxen’s streamlined connected television (CTV) and omnichannel buying workflow. Audigent transforms real engagement from premium publishers into over 1,000 ready-to-activate segments—spanning beauty, finance, travel, and more. Three key benefits Signal quality Verified publisher data drives higher match rates and wider look-alike reach. Media impact Reach up to 92 million entertainment fans, 78 million retail shoppers, or 71 million finance intenders across CTV, online video (OLV), and display without guesswork. Privacy and compliance Every segment is built from opt-in, first-party data and delivered through Audigent’s privacy-by-design framework. How Audigent and Nexxen boost your campaigns Now live in the Nexxen DSP, Audigent’s premium audiences plug directly into your existing buying workflow—making it easier than ever to plan, activate, and optimize at scale. Audigent utilizes cookieless, first-party IDs sourced directly from its premium publisher network, allowing advertisers to future-proof campaigns and continue to reach real people across browsers, devices, and CTV. Vertical use cases Auto Target auto intenders as they research new models, then retarget them on CTV during primetime motorsports broadcasts. Retail and CPG Engage retail shoppers with dynamic product ads ahead of peak sales weekends, bridging display and CTV for sequential storytelling. Travel and Hospitality Reach travel planners with destination-specific offers the moment they begin searching for flights. Finance Serve relevant credit card or fintech messaging to finance enthusiasts researching personal finance content. Premium audiences, measurable performance As a part of Experian, Audigent’s audience solution complements our broader identity resolution and activation capabilities, ensuring consistency across every channel. Together with Nexxen’s unified tech stack, advertisers can launch ads faster while respecting consumer privacy. Audience data, targeting, and media all sit in one workflow, making results easy to see and optimize. Contact us Latest posts