
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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QSRs have emerged as superheroes during the pandemic, creating an entirely different consumer experience in record time by offering contactless delivery, curbside pick-up, and other innovations that have allowed them to stay open and operational when so many other businesses have shuttered. But as many states are still moving through their phased re-opening plans and more options become available to consumers, QSRs are challenged with keeping their momentum going. How can they continue to build on their success? The key is activation. Advertising on the right channels at the right time. The more QSRs can offer experiences that leverage the power of data to better speak to their customers and address their unique needs, the better chance they have of continuing to succeed in these unwieldy times. As we move into the fall and winter, and as more and more people look to QSR’s to help with their meal plans, consider the following: 1. Use data to create a more robust loyalty program. There’s no question consumers have plenty of QSRs to choose from and using a loyalty program is an excellent way to ensure they continue to view you as a preferred dining destination. But you might be surprised to learn how much of a difference it can make to your bottom line. PYMNTS reported that in 2019, Starbucks President and CEO Kevin Johnson shared how the company’s active mobile app rewards membership grew to 16.8 million users, which comprised 41% of sales in U.S. stores. The PYMNTS Restaurant Readiness Index also shows that 79.5% of QSR customers and 47.5% of QSR managers see loyalty programs as a feature that is important to a restaurant’s success. Now is a great time to review your loyalty program (or create a new one) and see if you can expand it to offer more perks, thereby enticing more customer interaction. A strong loyalty program should include a combination of your own customer data, enriched with third-party data for deeper customer insights, such as behavior, lifestyle and interests. 2. Make it easy for customers to order, purchase and pick-up with mobile ordering. Mobile ordering is no longer the wave of the future—it’s part of the new now. PYMNTS reported that Dunkin’ Brands CEO Dave Hoffmann noted on-the-go ordering experienced an average weekly sales increase of 25% year over year—and this growth was especially key in locations without a drive-through. For customers who want an easy option that allows them to order, pay and pick-up at curbside, mobile ordering is the ultimate in simplicity, and your data can help you determine who is most primed to take advantage of this option so you can push it directly to them. 3. Offer demographic and location-specific promos. The power of data can help you know a lot about your customers, from age and occupation to whether or not they have a family, how they spend their time, and how much of that time is spent at your competitor’s restaurant. This data can help you craft promotions that can speak directly to your consumer, ensure you’re advertising on the channels they prefer and frequent and get them in your door. When you know you cater to parents who are tired of a long day of homeschooling and work Zoom meetings, you can tailor and execute a promo campaign that speaks directly to their needs and deliver it to their preferred channel, encouraging them to skip cooking and order from you instead. Or maybe you have locations that are close to college campuses, allowing you to entice students with a two-for-one deal they just can’t pass up. And as offices start the slow process of opening back up, there’s an opportunity to welcome workers back to the neighborhood with a special curbside or delivery pick-up deal. 4. Ensure your customer knows your brand values. More and more, consumers are becoming conscious of who they spend their money with and why. As Longitude Design points out, this is something Ben & Jerry’s does exceptionally well, and their value message is spread across everything the brand does, from their scoop shops to their store-bought pints to their company-branded events. This is your opportunity to share what you value as a company and a brand, and how it aligns with your consumer’s lifestyle. Is your food sustainably sourced? Is your packaging environmentally friendly? Be transparent about your supply chain, share how you care for your employees, give some insight into the prep process behind your food, as these insights will help your consumer gain trust in you, which in turn creates loyalty. Social media is a great way to get the word out about your value-based operational initiatives. To learn more about how you can use data to build on and enhance the new customer QSR experience, visit our Restaurant Marketing Solutions page.

Healthcare marketers: Open enrollment starts November 1st. Are you ready? It’s that time of year again—time to promote your insurance plans to existing and potential members ahead of open enrollment. But do you know your members beyond the basics? Sure, you know their name, address, phone number and email address, but do you know what communication channels they prefer? Do you know their lifestyle, behaviors and interests? In order for member communications to be effective, they need to be data-driven—first and foremost. The problem is, the industry is fragmented—and so is its data. With individuals covered by both private and public insurance plans—many payers don’t have access to a complete and accurate view of members and their respective data. And as the industry continues to move toward digital transformation and embraces automation, organizations that aren’t leveraging data insights are in danger of missing out on the opportunity to create a more solid connection with members. Partnering with a third-party data provider like Experian to enrich your first-party data is the answer. With a reliable source of data, health plans can more easily identify members, deduplicate their profiles, and leverage accurate contact information and communicate on a personal, relevant, empathetic level. Here are 5 ways to attract new members and retain existing members: 1. Create more accurate personas for marketing needs: Whether we use your data or combine yours with ours, you can gain stronger member analysis for segmentation and modeling that can help you maintain current relationships or expand your outreach to acquire new members—and ensure the loyalty of both categories. 2. Ensure the accuracy of member data: With Experian’s identity and data solutions, you can rest assured that your member database is accurate and up to date to maximize contact rates and minimize errors. 3. Build strong communication channels with your members: Optimize your advertising efforts through preferred channels—and identify those communication channels—to effectively connect with your customers using our data identifying their lifestyle, interests, behaviors and more. 4. Understand more about your members’ needs and behaviors: We’ll help you keep your members healthy. What do your members do, need, prefer? How much can they afford for healthcare? How do they live? You could guess, or you can let unbiased data guide your decisions so you can better assist your members in their health care goals. 5. Create a better member experience: With data and insights, Experian can give you the information you need to enable a consistent member experience, allowing you to match your products in a way that complements your member’s needs and lifestyle. Experian cuts through the data overload by focusing on data that matters and drives actionable decisions. With Experian on your side, you’ll be able to leverage the largest consumer database. We’re here to help you to manage a wide range of marketing needs, including measuring your campaign impact and determining the best messages to use to connect with your audience. We can also assist with securely managing your data in a way that helps to ensure the accuracy of that data to give you the most up-to-date picture of your current member database. Ready to learn more about our healthcare marketing solutions for open enrollment? Complete our online form and an Experian Marketing Services representative will reach out to you soon.