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I am trying to understand the benefits of using blockchain technology in document certifications such as university diplomas. I would like to know the difference between digital certification and blockchain certification. To be more specific, the digital certification that I am considering works as follows. A trusted certification authority issues public-key certificates to universities. A university issues a certified digital diploma by signing a hash of the digital diploma. In blockchain-enabled certification, the difference is that signed documents are stored in the blockchain. Some proposals only store the hash value of a document instead of a digital signature. I am not considering such scenario because the storing process becomes too critical. In blockchain-enabled certification, decentralized PKI can be used instead of a centralized PKI. Putting aside the difference between decentralized and centralized PKI, I do not see any real advantage of blockchain-enabled certification except the longevity and availability of digital documents provided by the immutability and distributed nature of blockchain. What am I missing? Anything wrong with my scenario?

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    $\begingroup$ Blockchain is an overhyped buzzword and there is no other benefit to using it for this purpose. $\endgroup$ Feb 6, 2022 at 8:20
  • $\begingroup$ @meshcollider there is an interesting usage if block-chain on diplomas. In some countries, maybe in all of them, if you find the correct person ( or people), you can have a diploma. If blockchain is used, then getting an old diploma can be easily seen since it must be on the newest blocks. Even if one buys the diploma during a regular time, the other students can still see someone who was not their classmates and post it online to fight it or start legal action against it. $\endgroup$
    – kelalaka
    Feb 6, 2022 at 11:30
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    $\begingroup$ @kelalaka - why can't the same be done with Centralized PKI - you can timestamp & sign the diploma if when it was issued is important. $\endgroup$
    – user93353
    Feb 7, 2022 at 15:09
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    $\begingroup$ @kelalaka - the university which issues the diploma is the one who will handle it's centralized PKI - if you don't trust them, then why would you even trust if a real diploma issued by them has any real value? $\endgroup$
    – user93353
    Feb 7, 2022 at 15:21
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    $\begingroup$ @kelalaka - I am talking about the first issue - i.e. issue of a old dated diploma. That cannot be broken by finding the right person at the university - if you add a timestamp to the diploma along with the signature. $\endgroup$
    – user93353
    Feb 7, 2022 at 15:34

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