The link records no one.
No cookie, no visitor id, no network address. Beside the count, it keeps only a hash of the browser's ordinary headers, to spot a double click.
OPTIMIZE · CAMPAIGNS AND LINKS
A campaign in Praxis is a record of its own: its tracked links on your own domain, the people it brought, what they were shown, the experiments it ran, and what it earned. One page holds all of it, and every link waits for your approval.
Links and Campaigns sit in Optimization, beside Experiments, Personalization and Audiences, and what each campaign earned is read in Insights › Analytics.

Tracked links
The open pixel

A campaign is a record
What a campaign earned
Aim content and tests at its arrivals
In a sentence
/l/<key> sends the visitor on to its destination with the link's UTM tags added. The link's tags win over any of the same name already there, and every other parameter is kept. An unknown key is a plain "not found".
One counter per link per UTC day. A mail scanner's HEAD check never counts, a browser's prefetch or prerender never counts, and a repeat of the same click within 2 seconds counts once.
No cookie, no visitor id and no network address. Beside the count, it keeps only a hash of the browser's ordinary headers, to spot a double click.
On your site, and only with the visitor's consent, their arrival is recorded with its tags: as their first touch if it is their first arrival, and as their latest. The campaign's audience and its numbers follow from there.
First touch and last touch
Archived, not broken
The pixel, precisely
No cookie, no visitor id, no network address. Beside the count, it keeps only a hash of the browser's ordinary headers, to spot a double click.
An open alone identifies nobody, and "Opens" is kept apart from the visitors a campaign brought.
An open joins a person only after that person lands and consents.
A mail scanner's HEAD check, a browser's prefetch and a double click are kept out of the count.
Making, changing and archiving a link, and changing or archiving a campaign, each wait at a card.
Archiving never breaks a link already sent.
Yes. Every link lives on your site's own address, as /l/<key>.
A real visit to the link. A mail scanner's HEAD check, a browser's prefetch and a double click within 2 seconds are not counted.
Not from the open alone. An open counts for the campaign; it is joined to a person only if your sending tool adds a recipient reference and that person later lands and consents.
Yes. An arrival whose campaign tag matches a campaign's key counts toward that campaign's numbers, from any channel, whether or not it came through a Praxis link. Its audience, "Came from this campaign", counts the tag when it was the visitor's first arrival.
Its links keep sending people where they should go, and stop counting.
Your choice of first touch or last touch, for every campaign.