Okay, we have deeper insight into it: https://github.com/stackernews/stacker.news/blob/master/worker/trust.js

Tbh, I am not very good in actually understanding code from open source projects. It seems to iterate through a graph beginning with @k00b - that makes sense

But the creation of the graph via sql is black magic to me: discounted by time logarithmic, then just building the sum means no penalty for lots of low-upvote comments (?)