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Yeah, the content itself might not always be available, the only guarantee is that if that content exists, you'll get exactly that. If the content is not available, you get nothing.

So the links themselves are immutable but the content might not be available.

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And that's what's so hilarious about putting a content hash on a blockchain, when you can just give it to someone over HTTPS. The hash is plenty immutable all on its own.

Strong transaction ordering can give you proof of existence at a certain point in time, but that's not useful in an identity context.

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