Federated recommender systems have been crucially enhanced through data sharing and continuous model updates, attributed to the pervasive connectivity and distributed computing capabilities of Internet of Things (IoT) devices. Given the sensitivity of IoT data, transparent data processing in data sharing and model updates is paramount. However, existing methods fall short in tracing the flow of shared data and the evolution of model updates. Consequently, data sharing is vulnerable to exploitation by malicious entities, raising significant data privacy concerns, while excluding data sharing will result in sub-optimal recommendations. To mitigate these concerns, we present LIBERATE, a privacy-traceable federated recommender system. We design a blockchain-based traceability mechanism, ensuring data privacy during data sharing and model updates. We further enhance privacy protection by incorporating local differential privacy in user-server communication. Extensive evaluations with the real-world dataset corroborate LIBERATE's capabilities in ensuring data privacy during data sharing and model update while maintaining efficiency and performance. Results underscore blockchain-based traceability mechanism as a promising solution for privacy-preserving in federated recommender systems.

Ken Kocienda walks toward me, with a small white square pinned to his shirt. "Play songs written by Prince, but not performed by Prince," he says. The Sinéad O'Connor version of'Nothing Compares 2 U'--a song originally written by Prince--begins to play. A green volume meter, pause button, and next-song button appear on his hand. He twists his wrist clockwise, and the volume rises. Anticlockwise, and the song gets quieter.

Ninety7 specializes in battery docks that render smart speakers portable, so it's appropriate that the company's new product for the Amazon Echo 2 features a large, easy-to-grab handle. The Sky is a replacement sleeve for the Echo 2 that docks the speaker to an 8800mAh Li-ion battery, so you can take Alexa out in the yard or on even on the road. The company says the battery should power an Echo 2 for about 8 hours, and a column of four LEDs near the bottom of the sleeve report the battery life remaining. I'm sure that will vary depending on how many times you summon Alexa and how much you use the Echo 2 to stream music. The battery gets recharged from the Echo 2's factory AC adapter and cable.