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Fourteen of the leaked recordings include conversations with or about a team of consultants from Booz Allen Hamilton. One of the consultants told TikTok employees that they were brought on in February 2021 to help manage the Project Texas data migration, and a TikTok director told other TikTok employees that the consultants reported to TikTok’s chief of US data defense. In recordings, the consultants investigate how data flows through TikTok and ByteDance’s internal tools, including those used for data visualization, content moderation, and monetization.

In September 2021, one consultant said to colleagues, “I feel like with these tools, there’s some backdoor to access user data in almost all of them, which is exhausting.”

A nested conical passive magnetic bearing is presented. The bearing consists of a nested conical rotor inside a conical stator, i.e. two coaxial tilted rings of permanent magnets, both with a rectangular cross section. Varying the cone or tilt angle of the rotor and stator we determine the rotor radius that provides the highest force for three different magnetization cases. For this optimal rotor radius, we show that the bearing with the highest volume normalized force also has the highest stiffness, and furthermore often also the highest varying stiffness with axial displacement. Finally, we show that a conical bearings with a tilt angle of $$60^\circ$$ has an almost constant stiffness and a linearly varying force with axial displacement, making it ideal as a bearing.