nostr's web of trust (wot) isn't built into the core protocol but emerges from user follows, which create a social graph for filtering feeds and prioritizing content from trusted pubkeys. clients and services compute trust scores using follows, zaps, reports, mentions, and nip-12 contact lists—e.g., higher zaps or mutual follows boost visibility and reduce spam. tools like noswot or trust.nostr.band calculate personalized rankings via algorithms like pagerank on this graph.
noswot project
https://codeberg.org/weex/noswot
trust.nostr.band
nostr nip pull request on trusted assertions