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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Linear TV advertising — also known as traditional or broadcast TV advertising — refers to scheduled ad programming broadcasted over traditional channels. While it doesn’t dominate the spotlight as it used to, it’s still a significant force in advertising today because of its vast potential to reach broad audiences and create memorable moments through high-profile events. Broadcast and cable TV, both forms of linear TV, still account for around 24% and 26% of U.S. TV viewership, respectively. As marketers look for ways to combine traditional and digital strategies, knowing how linear TV still fits into the mix can create value for brands and provide new opportunities for broader reach and engagement. This article explores the relevance and benefits of linear TV and how traditional broadcast television can complement digital platforms alongside changing viewing preferences. Linear TV vs. digital channels Even though linear TV has maintained impressive viewership, it’s impossible to ignore the growing influence of advanced TV platforms like OTT (over-the-top) streaming services and connected TV (CTV). These digital channels have changed how audiences consume content, complemented traditional linear TV, and created new marketing opportunities. Each offers unique advertising value, and knowing how linear and certain forms of advanced TV stack up can help advertisers make informed choices about where to focus their efforts. Linear TV Linear TV is regularly scheduled programming on networks like ABC or NBC. The name refers to its linear delivery of content on a set schedule, with all viewers tuning in at the same time. It's great for reaching large audiences during live events or prime-time shows but lacks the precise targeting options available on digital platforms. Targeting: Advertisers can only target broad demographics (age, gender, location) but not specific interests or behaviors. Ad format: Ad formats typically take the form of non-interactive ads, usually 15-, 30-, or 60-second spots shown during commercial breaks. Viewer engagement: Viewing is passive, as ads are shown at fixed times and cannot be skipped. OTT OTT refers to streaming services that bypass traditional cable or satellite to deliver content through the internet on platforms like Netflix, Hulu, and Peacock. Content is available on-demand and accessible on devices like laptops, tablets, smart TVs, and smartphones. OTT is flexible, so viewers can watch what they want when they want. Targeting: OTT offers precise targeting using interest, viewing behavior, and location data to personalize ads. Ad formats: Formats can include pre-roll, mid-roll, sponsored content, and sometimes interactive ads to drive engagement. Viewer engagement: Viewers can control their experience with the ability to pause, skip, or replay content depending on the platform’s features. CTV CTV refers specifically to televisions connected to the internet through built-in smart features or external devices like Apple TV, Amazon Fire TV, or Roku. CTV is a delivery mechanism for streaming OTT content to the TV screen, making it like an intersection between traditional TV and digital streaming. Targeting: Similar to OTT, CTV allows precise targeting based on viewer data such as preferences, behaviors, and geographic location. Ad formats: Includes pre-roll, mid-roll, post-roll, and, in some cases, interactive ad features like clickable banners or in-ad actions. Viewer engagement: Engagement levels are higher than linear TV, as viewers are often more active participants who can pause or interact with ads. A brief comparison: Linear TV, OTT, and CTV The main differences between OTT and CTV are in their delivery and access. OTT refers to the streaming services providing content, regardless of the device, while CTV refers to the internet-enabled TV screens through which OTT content is consumed. They’re complementary, with OTT defining the content and CTV shaping the viewing experience on the largest screen in the house. Each TV platform has its own strengths. Linear TV is great for reaching a broad audience with memorable ads, while OTT and CTV offer more precise targeting and greater viewer engagement. Advertisers should consider using a mix of these platforms, taking advantage of each one’s benefits to create a well-rounded advertising strategy. Benefits of linear TV in the modern advertising landscape While consumer behavior has shifted toward digital content consumption, the sheer scale and influence of pre-scheduled, real-time broadcast TV advertising makes it a powerful tool for brand advertising within a broad media strategy. When integrated with digital strategies, linear TV can widen your reach, foster brand safety, and boost viewer engagement, to name a few benefits. Mass reach and brand visibility Broadcast TV advertising has a massive reach, especially during live events and news broadcasts. It delivers content to large, diverse audiences at once — something digital platforms, with often fragmented and niche targeting, cannot achieve on the same scale. To put things in perspective, there are nearly as many linear TV viewers today (228 million) as social media users (236 million), according to eMarketer. This helps marketers earn brand visibility and recognition across broad demographics and make an impact on their target audience. Advertisers can also use linear TV to reach multiple individuals in a single household, making it an efficient way to run household-focused marketing campaigns. Linear TV advertising increases the likelihood that a diverse audience residing in one household will see your content. Brand safety and controlled environment One of linear TV's most important advantages is its controlled, brand-safe environment. Unlike digital platforms, where ads can appear alongside user-generated content or in unpredictable and sometimes risky settings, linear TV offers a more curated environment. Advertisers can be confident their message will be delivered in a professionally regulated context so viewers develop a positive, reliable brand association. Diversify your marketing mix Some demographics are underserved by digital channels and are more likely to see ads on linear TV than on an internet-connected device. Top U.S. advertisers obtain more impressions among adults over 55 using linear TV ads, with Baby Boomers spending an average of 5 hours and 46 minutes daily on linear TV. This highlights why it’s so critical to diversify your marketing mix with various channels that help you tap into audiences your competitors may not be. Preferred hosting for major events Digital platforms are hosting more live events every year, but linear TV is still the most successful and reliable medium for major events like elections, breaking news, award shows, primetime TV, and the Super Bowl. In fact, linear TV dominated the 2024 U.S. Presidential election, with major networks achieving off-the-chart ratings and more than 42 million cable viewers nationwide. Guaranteed ad exposure While many digital platforms allow viewers to skip ads, linear TV ads have stayed unskippable and ensured viewers receive full exposure to marketing content. With traditional TV ads reaching as long as 60 seconds, this guaranteed viewership is a chance you can’t miss to capture your audience's attention. Viewer engagement and ad recall Paired with CTV, linear TV is exceptionally good at engaging viewers and facilitating strong recall with high-quality content. A recent study by Brightline found that, even in 2024, linear TV maintains the highest ad attention with an attention rate of 54.5%, surpassed only by premium CTV with a 56.1% attention rate. When viewers are highly engaged with TV programming, they’re also more likely to remember the aired ads, which boosts ad effectiveness and sales potential. According to a Comcast Advertising study, long-form TV and streaming ads are also twice as memorable as short-form mobile digital ads. This study revealed that TV ads garnered more visual attention than digital mobile ads, as participants watched 71% of the TV ads compared to the 30% they watched on mobile. Ads viewed in the TV environment even resulted in 2.2x higher unaided recall and 1.3x greater purchase intent than mobile digital ads. Traditional TV advertising, combined with digital, creates a full-screen, lean-back viewing experience that makes lasting impressions and elevates consumer memory. Current trends in TV advertising While it's true that linear TV is facing a viewership decline as audiences shift to digital platforms, it’s not disappearing entirely. Advertisers are finding new ways to innovate within the confines of linear TV and using advancements in targeting, content delivery, and OTT platform integrations. Free ad-supported television services (FAST) For one, linear TV is finding a new lease on life through FAST services; FAST channels bridge the gap between traditional linear TV and contemporary streaming preferences to reshape how audiences engage with ad-supported content. The main appeal of FAST is its ability to deliver curated, genre-specific programming combined with on-demand options. Roughly 70% of streaming users know about FAST and have used it within the last three months. Unlike traditional video-on-demand (VOD) platforms focused on high-profile originals and on-demand access, FAST channels bring back the structured, live grid format that mimics classic TV viewing experiences. Services like Pluto TV, Tubi, and the Roku Channel have captured significant audience share by blending nostalgia with modern accessibility. These agile, scalable platforms help media companies quickly launch new channels, as they did with NBCUniversal’s recent addition of 48 channels on Freevee and Xumo Play. High-impact events Certain genres, like live sports and award shows, continue to dominate on linear TV, including: The Super Bowl Other major NFL games The NBA Finals The Olympics The Oscars The Grammy Awards The Emmy Awards These events attract massive audiences and are a prime spot for advertisers. However, even live sports are transitioning to OTT platforms like Netflix, Amazon, and Peacock. Platforms like Amazon Prime Video, Apple TV, and ESPN+ are starting to secure exclusive streaming rights for major sports events and changing viewership patterns, which creates fiercer competition for linear TV. On the flip side, marketers have new opportunities in OTT environments to enjoy the reach of traditional TV advertising with more precise targeting. Linear programmatic TV While linear TV faces growing competition from digital channels, it’s adapting to meet marketers’ needs through innovations like linear programmatic TV. This approach automates the buying and placement of ads on traditional TV so advertisers can apply data-driven insights for more precise targeting. Unlike traditional linear ad buys, which rely on fixed schedules and broad audience demographics, programmatic technology allows for greater efficiency, flexibility, and strategic alignment. Recent forecasts show linear programmatic TV growing steadily throughout 2025 and being a valuable transitional tool that combines linear TV’s reach with digital platforms’ personalization and measurability. Cloud TV Cloud TV modernizes the traditional TV advertising experience by combining its established infrastructure with the best features of digital streaming and OTT. Companies like Vodafone and Viacom18 are transforming linear TV into a more flexible and scalable cloud-based service that delivers linear content alongside streaming options. Users can now conveniently access live TV and on-demand content from one interface. Currently, platforms like YouTube TV and Hulu + Live TV blend linear broadcasts with OTT streaming in the cloud so that viewers can watch traditional TV channels and access on-demand shows all in one place. This means advertisers can deliver targeted, personalized messages to the right audiences without losing the large-scale reach of linear TV and engage people across live TV and digital content. Addressable TV and advanced targeting Linear TV has always been limited by broad targeting, showing the same ad to everyone, no matter who’s watching. Addressable TV changes the game, letting advertisers deliver different ads to specific households during the same program so brands can reach the right people with messages that matter to them. The key to making this work is authenticated audiences. These are viewers who log in to platforms with verified information, giving advertisers better insights into their interests, behaviors, and demographics. This level of audience data allows for smarter audience segmentation and more effective ads based on interests, demographics, and behaviors. With Experian’s addressable TV audiences and strategic partnerships, you can execute highly targeted and measurable TV campaigns. Using reliable first-party data and universal identifiers (like Unified I.D. 2.0), which link consumer profiles across devices and channels, we help brands reach the right viewers on traditional TV and CTV platforms and ensure the right person sees the right ad at the best time without overexposure. How to integrate linear TV with digital marketing strategies Integrating linear TV with digital marketing strategies starts with aligning campaigns with audience behaviors and preferences. Using data-driven insights, brands can ensure their TV efforts complement digital channels to create a unified, impactful experience. Experian simplifies this process with advanced identity resolution and audience insights. Our identity graph and syndicated audiences can help your brand: Link TV ad exposures to online engagement and create a seamless experience across platforms. Measure cross-channel performance and understand how linear TV contributes to digital outcomes. Use enriched audience data to tailor ads that resonate for relevance and consistency across TV and digital. We’re ready to help you maximize the effectiveness of your TV advertising campaigns. Ready to connect with Experian’s TV experts? Partner with a leader in data and identity to achieve the full potential of your television marketing. Our innovative tools and collaborations with top industry platforms provide exciting opportunities for you to reach and engage your ideal audience. Let us help you transform your strategies and maximize your marketing ROI with our advanced TV solutions. Talk to our TV experts Contact us Latest posts