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You mean the Wayback Machine?

I've seen downloads on regular IA with hashes posted.

Yes but I'm more curious about how they archive the content at the first place. It's not tamper-proof so it gives them a power.

> it gives them a power

To what purpose? And why would their integrity be different from other archival services, like libraries and museums?

Who controls the past, controls the future. Who controls the present, controls the past.