Now that I look more closely. There are nuanced differences, and Apple/Google's solution is better. DP3T has an infected person share a daily key from which all future keys can be derived. Apple/Google's discloses only the keys from the infection period.https://twitter.com/colmmacc/status/1248673126797328385 …
Apologies to DP3T if so! I haven't recalled it from the papers, but they're a lot to read. Can still link a person across the days though :( also Google/Apple's strategy of using time-slot derived values greatly reduces the comparisons needed in the app.