Linera, a new public chain founded by former Libra employees, released a white paper today. According to the white paper, Linera introduces the idea of ​​"micro-chains" that operate many chains (possibly millions) in parallel within the same set of validators. In Linera, scalability is achieved by adding chains, not by increasing block size or rate. Linera encourages users to operate their own micro-chains. When the microchain is operated by a single user, Linera uses a simplified mempool-less consensus protocol inspired by reliable broadcast.