One of ZeroTier's differentiating features vs. other mesh VPN or zero-trust networking type things is that it's engineered to be "as decentralized as possible." Principle is "minimal trust centralization." Some background reasoning is explained here: http://adamierymenko.com/decentralization.html https://twitter.com/davidnburgess/status/1403094183808753667
We are following Adams ZeroTier work for a longer while already ... and his "decentralization: i want to believe" article from 2014 is still an excellent read today.
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