Project Nylo: An open protocol for cross-domain analytics without third party cookies or fingerprinting

Third-party cookies are dead. Safari killed them in 2017 (ITP), Firefox in 2019 (ETP), and Chrome's been slowly following with Privacy Sandbox. If you run analytics across multiple domains, Ex: A hospital site linking to a pharmacy portal, a bank linking to an investment dashboard, you've lost the ability to know the same visitor made both visits. The existing alternatives all have problems: Solution Problem Browser fingerprinting Ethically questionable, increasingly blocked, legally risky under GDPR Login-based identity Forces authentication just to be counted and excludes anonymous visitors First-party data sharing Requires business partnerships and PII exchange Privacy Sandbox Topics API Chrome-only, advertising-focused, coarse-grained Adobe ECID Same eTLD+1 only, classified as personal data under GDPR So I built Nylo , an open-source SDK and protocol ( WTX-1 ) designed around a simple idea: you don't need to know who someone is to know they visited two pages. How it works in 30 sec