Though many contact tracing apps involve location tracking, they don’t have to.
This is a video adaptation of a post by Nicky Case: https://ncase.me/contact-tracing/
New post by Nicky on COVID-19: https://ncase.me/covid-19/
Consider supporting his work: https://www.patreon.com/ncase/
Supporters of this video: https://3b1b.co/ctracing-thanks

DP-3T Whitepaper:
https://github.com/DP-3T/documents/blob/master/DP3T%20White%20Paper.pdf

Full repo:
https://github.com/DP-3T

Where did the number 60% come from?
https://science.sciencemag.org/content/early/2020/04/09/science.abb6936

The specific figure is Figure 3, the last panel showing instant contact tracing (with an app). It shows what combination of % (symptomatic) cases isolated & % (pre/a-symptomatic) contacts quarantined would contain the virus or not.

Mental health resources (copied form a John Green video, since he knows what he's doing):
National Suicide Prevention Lifeline: 1-800-273-TALK (8255)
I know it can be scary to make a phone call, but people are…