Somebody asked me recently and I "got stuck" trying to explain this.
When people ask how many ZK nodes they should have a common answer is "odd
number: 3 or 5 or ...", so ZK can do majority voting. Correct so far?
Another reason is for HA - if one ZK node dies, there are still 2 of them
left. And this is where I am missing something core - with just 2 nodes
left, how can ZK do majority voting now?
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