Foundation Devices uses QuantumLink, a secure Bluetooth protocol, to connect the Passport Prime hardware wallet in real time with its companion app, Envoy. The wallet isolates its Bluetooth radio on a dedicated chip that operates independently from the KeyOS security processor and can never read the data passing through it. Communications are end-to-end encrypted using CRYSTALS-Kyber for key exchange and ChaCha20-Poly1305 for message encryption. Pairing takes place out of band through a QR code, while users can disable Bluetooth and fall back to QR codes, NFC or USB. Introduced on January 23, 2025, and developed with Blockchain Commons, QuantumLink aims to provide persistent connectivity while preparing the wallet for threats posed by quantum computers.
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