# Ittai Abraham et al. - Provable Broadcast (Highlights) ![rw-book-cover|256](https://decentralizedthoughts.github.io/img/DTblog.png) ## Highlights - **Locked Broadcast**: by running *two* consecutive PBs, we get a two round-trip protocol. This protocol additionally provides a *Unique-Lock-Availability* property: a *delivery-certificate* is a proof that $n−2f$ honest parties received a *lock-certificate* for this value, and no other value can have a *lock-certificate*. ([View Highlight](https://read.readwise.io/read/01kf9s3cbxsmj53fcezeycn8td)) ^979248266