Just skimming that paper, it doesn't look like they made use of any kind of fingerprinting. The paper below shows how BLE devices can be profiled to extract a p

Just skimming that paper, it doesn't look like they made use of any kind of fingerprinting. The paper below shows how BLE devices can be profiled to extract a potentially unique fingerprint. I don't know how well this would scale to large numbers of devices, but I'd imagine if you used such a fingerprint, you could dramatically improve the association between randomized MAC addresses even if the fingerprint is not 100% unique. https://inria.hal.science/hal-02359914/document https://inria.hal.science/hal-02359914/document