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An overview of the Bluetooth Contact Tracing Protocol by Apple & Google. The project aims to reduce the spread of coronavirus by tracking chains of contacts and early detection of newly infected users. The main task of the protocol is to share anonymous identifiers between smartphones in case of such contact, and to eventually notify all such contacts should someone get infected and report their status. A similar contact tracing technology called BlueTrace has already been developed in Singapore earlier this year. At the moment, Trace Together is installed on over 1 million devices.