# Cross-domain tracking (https://talivia.com/docs/cross-domain-tracking)



Browser cookies cannot be shared between unrelated root domains. Talivia uses a short-lived signed linker instead.

1. Open **Settings -> Attribution**.
2. Add every owned root domain used by the journey.
3. Keep **Cross-domain tracking** enabled.
4. Copy the refreshed snippet from **Settings -> Tracking** to each domain.

The generated snippet includes `data-cross-domain-domains`. After the first tracking response, Talivia decorates matching links with `_tlv`. The destination verifies the signature, continues the anonymous visitor/session, and removes `_tlv` from the address before storing the page view.

The linker expires after five minutes and is scoped to one Talivia website ID. A modified token, expired token, or token issued for another website is rejected.

Subdomains do not need the linker. Use [Subdomain tracking](https://talivia.com/docs/subdomain-tracking) for `example.com` and `app.example.com`.