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Because several people were asking about #Bluetooth, I'll make a thread. But I might ignore further questions, especially regarding over-the-air exploits. #DP3T

• BLE advertisements have a longer range than 2m, but are way more accurate than LTE cell towers.
(1/n)
• BLE advertisement distance measurement accuracy depends a lot on the chips, meaning that they will work well within the Apple ecosystem, but probably not so well on some Androids. (2/n)
• The Singapore app solves this by maintaining active BLE/GATT connections, which provides better measurements, but drains battery power.

• On iOS, the BLE/GATT handler has been extensively tested for security issues and is definitely one of the better ones by now. (3/n)
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