Like Math CAPTCHA, only deeper and with more subject matter versions? One of the math forums (Cut the Knot?) had something like this, that actually required (I think) calculus.

Reputation systems such as HN itself are another approach. These might not scale; or they might require an eigentrust-like system to scale; or scaling via eigentrust might create and reinforce the same kind of filter bubbles we see on social media. Who decides who’s a climate expert?

Steemit is an attempt at a blockchain-based reputation system. Whenever I’ve looked, it’s been dominated by low-quality content, mostly about crypto itself. Maybe this is growing pains, or maybe a reputation system needs a different go-to-market (that bootstraps from an existing platform or community), or maybe wedding reputation to crypto — or at least to crypto that pays out — just isn’t a good idea. (You didn’t exactly suggest that, either; I just riffed my way over to it.)

As for a math captcha, http://random.irb.hr/signup.php

sometimes it'll be simple arithmatic, other times multi-variable calculus.

This idea was what lead to the split up of Jimmy Wales and Larry Sanger on Wikipedia. Sanger went and created Citizendium which was supposed to be wikipedia with only credentialed authors and a panel of peer review.

By all accounts Citizendium failed pretty spectacularly.

Maybe you could count number of Ph.D contributors? I bet Bitcoin has as many or more than every other project combined.

Citation needed. Appeal to authority, with no evidence of competency.

Why do you believe that?

IOTA has a lot of PhD contributors, allegedly

Excellent, and we need to release the token that you will get based on PoE.

With a methodology for generating consensus...

Well it’s hard to be negatively exposed to crypto so the discussion will be biased.

You can short crypto on Cboe and CME. A few minutes on the internet will reveal other means for shorting crypto.

Like Stack overflow?