And a blockchain helps to solve which part of the problem? Some were working on mirroring all data to a git repository. In theory, that allows for easy access on all the data, versioning (with commits) and - through forks and merge requests - collaboration and distribution. Also git is a distributed repository that clones the whole history to your local drive.

github.com/…/mitre-cve-database

But with the announcement of the cve foundation, I don’t know whether they will really import all the data in this git repository.