Researchers and scientists could have asymmetric keys and peer review in that fashion. The authors could append cryptographic signatures to the article. Then we don't need centralized journals, just a list of academics whose scientific rigor is trusted.
I have often thought about doing something similar to this. Basically, you publish a signed version of your paper on your own website, and then other scientists can sign it with notes. It would be kind of like a "Facebook like" system. (By "sign", I mean a cryptographic signature.)
"82 PhD scientists have reviewed this paper, including 3 people in your close network and 2 more people from your extended network." ...or something like that.
You could do a network-graph search. Start with some professors that you trust, and some keywords that you're interested in and start walking the graph from there.
I don't know what the profit motive would be for someone to build this though. Nor the motive for individual reviewers to carefully review someone's paper and provide detailed useful feedback...
