How exactly can #DP3T privacy-preserving Bluetooth COVID-19 alerts work if identifiable personal data never leaves your device? It's actually not so complicated, and even less so now @ncasenmare has made a fantastic, public domain, comic explaining it: https://ncase.me/contact-tracing/ 1/

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And that's it! Public domain means anyone can translate these — and we'd love you to translate them into your own language as per the instructions in the last pane! All the details of the protocol are on our repository: https://github.com/DP-3T/documents  6/6

(and here is original thread with more info, including that DP-3T is not PEPP-PT, PEPP-PT is an umbrella effort with many different protocols, including centralised ones that do not function like in this comic, within) https://twitter.com/mikarv/status/1246124667355660291