https://techcrunch.com/2020/04/06/eu-privacy-experts-push-a-decentralized-approach-to-covid-19-contacts-tracing/

A group of European privacy experts has proposed a decentralized system for Bluetooth-based COVID-19 contacts tracing which they argue offers greater protection against abuse and misuse of people’s data than apps which pull data into centralized pots.

The protocol — which they’re calling Decentralized Privacy-Preserving Proximity Tracing (DP-PPT) — has been designed by around 25 academics from at least seven research institutions across Europe, including the Swiss Federal Institute of Technology, ETH Zurich and KU Leuven in the Netherlands.