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
trust.nostr.band
https://trust.nostr.band/
nostr nip pull request on trusted assertions

Codeberg.org
noswot
A web of trust made from nostr follows and reports
GitHub
Trusted Assertions by vitorpamplona · Pull Request #1534 · nostr-protocol/nips
Certain calculations in Nostr require access to the entire dataset of events and are impossible to do directly by Clients. This PR offers a simple ...