Why does the signed hash need to be on a blockchain? Why not on the university's website? Or on some national or international clearinghouse's website, or all t

Why does the signed hash need to be on a blockchain? Why not on the university's website? Or on some national or international clearinghouse's website, or all three and more. The hash is already signed, then so as long as you can trust the keys used to sign it (a problem not solved by blockchain), then you can get it from anywhere, any untrusted source, because the trustability is inherent in the object itself.