10 OpenRTB Native Mistakes That Pass Solo Validation and Kill Fill
In October 2025, DT Exchange documented native inventory on OpenRTB 2.5 with a changelog entry that adds native on Imp and a full Native object tabl…
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ChatGPT already knows your other browsing.
OpenAI's ad collector at bzr.openai.com sets a cookie called __obi . It is scoped to .openai.com , its value is written while you are on ChatGPT and…
DSP Losing Auctions on Timeout While Infrastructure Costs Grow: What to Measure and How to Check Who Can Fix It
Originally published at ambrain.org . Timeouts on two exchange connections and an infrastructure bill that grows faster than revenue can both be mea…
Publisher-Stage ARTF With bid_response on the Envelope Stages the Agent Wrong
An SSP-side ARTF host labels the extension point LIFECYCLE_PUBLISHER_BID_REQUEST , keeps yesterday's bid_response on the envelope for debugging, and…
plcmt=5 With playbackmethod=1 Validates. Those Two Integers Name Different Formats.
A trafficking template copies last quarter's instream tag, changes one field to pause inventory, and ships. The VAST response validates. The buyer's…
I went looking for my ad profile inside the bid request. It wasn't there.
When an ad is auctioned for you, a bid request goes out that describes you — segments, identity graphs, consent state, location precision. Buyers se…
The Number That Never Existed
A single made-up number, 1.9 percent, almost killed an experiment that never ran. Then I found the same lie hiding in my Medicare billing engine and…
Green Is a Timestamp
A test failed in my Medicare reimbursement engine on a day nobody touched the code. No commit, no deploy, no new data. I read the diff twice looking…
UID2: The Standard That Quietly Replaced the Tracking Cookie
While the industry celebrated the “death of the third-party cookie,” advertising platforms built a more persistent and standardized identity system…
OMID Explained: How IAB's Open Measurement SDK Works with VAST AdVerifications
You've probably seen apiFramework="omid" inside a VAST tag and wondered what it actually does. This is the practical explanation — what OMID is, how…