@deobald i'd be very very afraid of any kind of computer-based reputation system. those things will immediately dehumanize and lock out the most vulnerable people, as they always do.
some journals and lit mags already require a submission fee, which is sort of like proof of stake already? but this is not common practice because, once again, it locks out people who can't afford to pay $50 to five different publications every month.
maybe a system like the Lobsters invite system might be a good idea? https://alexjacobs08.github.io/lobsters-graph/. when you invite somebody to Lobsters, your profile gets linked to theirs. the idea is that this prevents people from inviting bad actors into the community because they wouldn't want to be associated with them. and it also makes it easy to prune entire bad branches of the tree if a group of bad actors are found out.
but Lobsters is a tiny community. not sure how something like this would work at scale.