I found that this was more a use case for key-based authentication than it was for blockchain, and I also think the article felt a little bit like an endorsement for a start-up called Trusted Key. There's a lot of key-based authentication systems out there; the market leader is probably Yubi, which just completed a successful trial with Google. Token puts it into a (large) ring (which needs to be smaller). They're based on a new web authentication protocol called FIDO2 being developed by W3C with major players in the web space. Here are the basics of FIDO2. Anyhow, the ORU example documented here has the university and the student sign certificates, such that these signatures are recorded in a blockchain.
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