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@Richard, we use a Merkle tree internal representation that is based on cryptographic hashes, the same used in Git or the blockchain, to ensure integrity of our contents.
See for example slides 17 etc. in this presentation https://annex.softwareheritage.org/public/talks/2016/2016-09-07-paris-olasd+zack-git-meetup.pdf
So how do they insure the version they archive hasn’t been tampered with?
Good idea, I’m sharing this website with my friends who understand this.