Comment by 0xBeefFed

It should be noted that your privacy is not preserved if you test positive and need to upload your Daily Tracing Keys to a server. Your broadcast IDs for an entire day can be linked together, making it easier to de-anonymize you. I understand that they use Daily Tracing Keys to reduce the demand of the backend server, but I think it would be better for user privacy if they either reduced the linkable period from a day to say an hour, or used an unlinkable design.