Todd Vierling 
@craignicol @Aradiel @molly0xfff
Decentralized systems have an actual meaning in information security. They indicate that not all data is stored in the same place.
Blockchains don't do this. They replicate all the data on all nodes.
Molly White@ToddVierling @craignicol @Aradiel there's nothing the crypto industry loves more than to say "decentralized" when they mean "distributed"
James Cape@molly0xfff @ToddVierling @craignicol @Aradiel The terms are fuzzy, but I think:
1. Decentralized systems are about removing centralization, which necessitates some duplication of effort. Consensus mechanisms are various levels of decentralized. e.g. voting and PoW.
2. Distributed systems are about distributing the workload to multiple machines. In practice, this always involves trying to minimize the duplication of effort. IMO the canonical example here is a Scalar Clock / Sequencer system.