One-liner to check whether a file on disk matches a file uploaded to Sia: $ diff foo <(user download foo.usa)
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Clarifying question: is the protocol not doing that automatically for you? (by means of a checksum (or something else) rather than checking a file stored on disk?)
Yes and no; the protocol verifies data using Merkle proofs. When downloading, the renter requests proofs from the host, but it throws them away after verifying them. So we can't use them to verify integrity later.
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We could add a local non-cryptographic checksum -- actually my format used to have one (see https://github.com/lukechampine/us/commit/bc5517cfbe2b1fe0947ec5053c20c64e24ab52dc …) -- but I don't think it's terribly useful.
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