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How is it useless?

If the digest you provide is found, then you know the data hasn't been changed. Sure, that's the only bit of information you get, but in a lot of cases that's the only one you need.

It doesn't guarantee your data can't be changed, no. What guarantees that is your contact with Amazon.




Your other comment puts it nicely - "trust but verify" - I guess it's more about auditing yourself, than Amazon.




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