Trillbit is a data-over-sound technology platform that transmits encrypted digital data between devices using ultrasonic sound waves. Any device equipped with a speaker and a microphone can participate in this proximity communication channel, making the technology device-agnostic and operable without an internet connection. The platform is organized into three primary product areas: - **Trill Auth** – A contactless authentication solution for ticketing and payment use cases, positioning sound-based communication as an alternative to QR codes and NFC. - **Trill IoT** – A device provisioning solution that uses sound to simplify the setup and troubleshooting of IoT and smart devices. - **SoundAuth** – A passwordless, FIDO-conforming authentication product that uses passkeys for authenticating users and devices. The underlying technology supports industry-standard encryption protocols including AES, RSA, and TOTP. It operates across Android, iOS, macOS, Windows, and Python environments via an SDK, and is described as cross-platform and low-power, making it suitable for embedded and battery-constrained applications. Use cases supported include transportation and ticketing, payment, check-in, access control, and IoT device provisioning. Partners include Espressif (AIoT platform), Chalo (bus transport), OYO, Mylorides, Knowles, and the FIDO Alliance.