My friend, the university can be legit but the human behind it not always. So for example, I want doctor degree from Uni X, i just go and find the best degree dealer and buy from them. For cheap price, they dont even bother to update the real uni database but for expensive one, they can just pay someone inside uni to change it. But with blockchain is impossible. And if you read my previous comment, how do you create new fake degree if all your information including all your grades and performance recorded on the blockchain from the day you enrolled and you have been getting bad or average grade? A glowing excellent grade on your fake certificate doesnt match with your history. If you only want bad or average grades on your certificate, why do you want to fake it?

Why shouldn't the degree dealer with the good contacts to the university sell a service writing fake grades to the block chain over the course of three years to finally give me fake diploma on the super secure blockchain?

Because normally someone who needs fake degree didnt plan 3 ir 4 or 5 years ago that they need fake degree today, it is normally when they realized one then they try to get it and trust me if we come from uni, we will understand how troublesome it is to doctor fake performance.for long time and this is only for 1 student and from 1 uni for only 1 time, the fake dealer can not make a living just from 1 customer, imagine having to fake it for over a period of more than 10 years for more than 100 fake students with more than 15 degrees options and each of them will have to go different classes with different teachers/ lecturers. All the complexities will make it close to impossible to do it and that means if they go to court.or double check all the teachers when confirmed can quickly say, i never gave these grades to this student or yhat student and I have never even seen them. Cos all information including the teachers who gave the grades will be stored there too.

You cannot prevent it anyway, but VCs (not that VCs.:) bit Verified credentials) can satisfy that the institution (issuers) provides the degree to the holder /w specific grades. But, how the verifiers (Companies' etc trust to that institutions is a very different story). Blockchain should not be a database of big data's but like some very small data (signatures, verifier's public keys hashes etc) and the real data should live outside the chains.