  This article will take you on a journey to the core of blockchains, their
Byzantine consensus engine, where HotStuff emerged as a new algorithmic
foundation for the classical Byzantine generals consensus problem.
  The first part of the article underscores the theoretical advances HotStuff
enabled, including several models in which HotStuff-based solutions closed
problems which were opened for decades.
  The second part focuses on HotStuff performance in real life setting, where
its simplicity drove adoption of HotStuff as the golden standard for blockchain
design, and many variants and improvements built on top of it.
  Both parts of this document are meant to describe lessons drawn from HotStuff
as well as dispel certain myths.
