web applications - How to cross-domain identify a user with third-party cookies? -

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i doing internship in ad-targeting startup.

we have publishers in our network can display ads send them. our system able analyze behaviour of user whenever visits 1 of our publishers.

on publisher's site, javascript code creates user id. javascript code stores user id in cookie able identify user visits.

but same physical user can have different usernames on 2 of our publishers. example "john doe" can "johnd" on publisher , "john_doe" on publisher b. want identify same user anywhere go in our publisher network. have seen third-party cookies combined tracking pixels (or tracking pixel scripts) perhaps solution: indeed these techniques used lot of ad companies cross-domain user tracking.

i don't know if these techniques fit want do. if so, wonder how (i quite new field). have ideas, advice, or documentation how architect this?

thanks

problem resolved : follow this link more details.


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