My main question was answered. Which was about the Bluetooth security. My next question is: Is this as secure as a Ledger Nano? Which one would you prefer? My feeling is that the coolwallet is best for adoption and in store usage, whereas the Ledger is more like a secure bank to store your savings in. So I guess it's for different uses: Convenience of quickly buying in shops - coolwallet. Security of an offline, off Bluetooth wallet - Ledger