I suppose you could argue that, but it's just semantics. In the Byzantine Generals Problem the generals are trying to achieve consensus. Their messages to each

I suppose you could argue that, but it's just semantics. In the Byzantine Generals Problem the generals are trying to achieve consensus. Their messages to each other need to be stored in a cohesive form, like a log file. The very definition of the Byzantine Generals Problem requires a single truth center. Call it a centralized database if you will, but the problem needs a single source of truth. When independently acting miners or mining pools that do not require a centralized host or server to "bless" their contributions to the single source of truth is indeed a decentralized system. Git and BitTorrent are decentralized too, but they don't have a single source of truth. I may have 100 git repo servers but which copy is the truth? Is Github's copy of master the ONE TRUE master or Bitbucket? Or is it my local repo? In source control it all works out in the end. The developers come to a consensus of where they will push their work. The maintainer will deploy code to production from one of the many repositories. But when you're dealing with financial transactions you definitely need to have a single source of truth. It doesn't mean it isn't decentralized to have a single source of truth.