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R0 - seems to be about 1.0-1.39

Goal, drive to < 1.0

Use time wisely

If not, economic ruin

Susceptible applies no vaccination in next weeks/months

Cellphone records are not granular enough. 

Try to correlate with cameras, credit card use, other private data. 

Make data sort of public, track rule-breakers. Force rule breakers to isolate. 

If found infected, repeat the process. 

Worked pretty well, causes problems, sustained over time = privacy breach

Success; however, new app due to pushback, draconian tracing is not good. They realize limiting spread to Singapore is not enough. Dependent on outside contacts - trading nation. Can't afford to close borders. 

Uses Bluetooth, more accurate. Limitation = more than a few think. However, limitation = strength. Limited distance, along with 'x' metrics for 'x' period of time, logs the others' ID (temporary ID). Initial lockdown of app, link phone number, and randomized ID, app or govt server creates a temporary ID (similar to a peer DID). Proximate users download from the edge, decrypted, and contracted by tracers for quarantine and test.

A combination of a decentralized model (download app, turn on Bluetooth, voluntary participation) Also needs a % of the population to participate, in order for it to be effective. Three conditions above are needed.

Three months ago, perhaps a few downloads. In Bluetrace protocol, being open-source, 620k downloaded so far. Privacy by design, to an extent. Link to the form with the randomized ID stored on a govt server. The app, even though it reduces correlation, still centralized management by a sovereign nation.

Jim: privacy issues, degrees of success (appears at this point)

Singapore homogeneous, small, can be controlled. Will it work everywhere? 

Will any approach be statistically significant.

Based on the Singapore proposal. App downloaded by choice.

Temporary ID 17, Bob is ID 9

Initial ID generated by the app. The only thing stored is a push token. Temporary ID uploaded periodically to a central neutral server. 

No phone number stored in a central location. Temporary ID uploaded periodically. Local data encrypted. Presumably, data protection is there. Link in the German article can be translated in Google.

What happens if one of those people tests positive?

If Alice is positive. She chooses to upload to the server.

Bob is notified, he has the option to get a test at a public health center. 

If Bob is found to be positive, process starts again.

The app only contacts people who are in danger of infection - not a blanket order for everyone to stay home. For people who are detected to be in close proximity and in danger of infection.

German proposal = GDPR = choice. Alice can choose, or not. Bob can choose, or not.

Choice is paramount.

People are softened up enough, a statistically significant portion of the susceptible population will probably install this app.