Byzantine general problem

I thought I studied this before but can’t find a post from my blog. Byzantine generals problem was named by Leslie Lamport, the creator of LaTex. They consider a distributed consensus problem with the allegory that every general will need to agree on a broadcast message so that they can unify their attacks. It seems that it is a well-developed field with the “practical byzantine fault tolerance” (PBFT) algorithm introduced in 1999. Several improved protocols were introduced. Apparently, blockchain can be used for distributed consensus implementation as well.