E.g. publishing a paper that gets positive reviews gives you some form of trust token that you can spend on other papers in a positive review.
Ideally there is no single global metric for trust, but trust is computed relatively based on who you trust, so that everybody gets a personalized quality and relevance score for each paper.
In a way you could also personalise your definition of trust.
E.g. do you want to rank papers highly that have positive reviews by a handfull of highly trustwothy individuals, or do you trust papers that have many positive reviews.