[shaky-carrousel]

It could enable to have a decentralised web of trust of reviewers. In the same vein it is used to verify identities, you can use it to assess the reliability of a reviewer. A reviewer could sign another reviewer's key with the confidence it has about their reviewing.

[jampekka]

This is done via academic credentials, mostly by publishing in the same field.

I don't think there are any major technical challenges in publishing or peer review. It's not complicated at all. The problems are sociological.

[shaky-carrousel]

Well, you depend on a trustable publisher. With a web of trust you won't need that. People could publish anywhere.