In a cookieless world, durable measurement depends on consented first-party identity built from data users give you directly — a login, email, or consented event captured server-side — rather than third-party cookies that browsers now block. It survives because it doesn't rely on a third party's cookie.
- ▪Third-party cookies are blocked or restricted across major browsers.
- ▪First-party identity is built from data users consent to share.
- ▪It's captured server-side and tied to your own systems.
- ▪Consent-first: identity only forms for users who allow it.
- ▪Declined users are modeled in aggregate, not tracked covertly.
Every measurement system needs to know “who did what.” For two decades third-party cookies answered that. They no longer do — so identity has to be rebuilt on a foundation you actually own.
Why identity broke
The shared identifier is already gone for most non-Chrome traffic.
Without that shared identifier, platforms guess — and guessing shows up as inflated, duplicated, or missing conversions.
The first-party alternative
| Third-party | First-party | |
|---|---|---|
| Survives modern browsers | No | Yes |
| You own the data | No | Yes |
| Consent-aware | Partial | Yes |
| Durable over time | No | Yes |
First-party identity is built from data the user gives you directly — a login, an email, a consented event — captured server-side and tied to your own systems. It survives because it doesn’t depend on a third party’s cookie.
How we stitch identity
Done right, you get a durable, consented view of who converts — without fingerprinting or buying shady broker data.
How do you rebuild identity without third-party cookies?
We start with what the user gives you directly and consents to: an email at checkout, a login, a form submission, captured server-side and hashed so it's durable and private. That consented first-party signal becomes the spine everything else hangs from, and because it lives in your own systems it doesn't evaporate the next time a browser tightens its rules.
From there we stitch sessions to that identity through server-side tagging and Consent Mode, modelling the gap left by users who decline rather than trying to track them covertly. The result is a measurement layer that's both compliant and complete enough for smart bidding to learn from — honest identity that survives the cookie's slow death instead of pretending it isn't happening.