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The Internet Archive and its 916 billion saved web pages are back online
(arstechnica.com)
This is a most excellent place for technology news and articles.
We don't need a blockchain for that.
Having multiple servers which store file checksums would have much less overhead, would be easily repeatable and appendable, with no need for unnecessary computational labor. Linux mint currently uses the checksum process for verifying that an ISO downloaded is not altered in any way, and it can work for any file (preferably not humongous files).
Strive for K.I.S.S. whenever possible.