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In page Covid Watch:

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Anonymous, decentralized Bluetooth exposure alerts first publicly appeared on March 2, 2020, when CW's James Petrie posted a PDF describing the privacy model in CW public slack channels, shared with researchers and collaborators worldwide.[3] Covid Watch's description of the technology and procedure for anonymous exposure alerts was shared widely on social media[4] and on the original Covid Watch blog written by Rhys Fenwick.[5] On March 10, 2020, Tina White reached out to Apple engineers to describe BLE anonymous contact tracing technology and background issues on iOS.[citation needed]