BlueTrace is an open-source application protocol that facilitates digital contact tracing of users to stem the spread of the COVID-19 pandemic. Initially developed by the Singaporean Government, BlueTrace powers the contact tracing for the TraceTogether app. Australia and the United Arab Emirates have already adopted the protocol in their gov apps, and other countries were considering BlueTrace for adoption. A principle of the protocol is the preservation of privacy and health authority co-operation. Preservation of user privacy was one of the core considerations around which BlueTrace was designed. To achieve this, personal information is collected only once at the point of registration and is only used to contact potentially infected patients. Additionally, users can opt-out at any time, clearing all personal information and rendering any recorded data untraceable. Contact tracing is done entirely locally on a client device using Bluetooth Low Energy, storing all encounters in a contact history log chronicling encounters for the past 21 days. Users in the contact log are identified using anonymous time-shifting "temporary IDs" issued by the health authority. This means a user's identity cannot be ascertained by anyone except the health authority with which they are registered. Additionally, since temporary IDs change on a regular basis, malicious third parties cannot track users by observing log entries over time. More information...
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