git-annex is not exactly blockchain but because of the way it operates -- storing files by their hashes, the whole Git commit structure -- it gives you several useful things: It becomes easy to clone repositories while guaranteeing that clones are identical. It also becomes easy to ensure that files are not tampered with.

https://blog.archive.org/2023/10/20/celebrating-1-petabyte-o...

Though given the space in general and some of the people involved it all should be audited very carefully.