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Each iteration of the Fixity service will compare the stored filesize value with the file in its current state. The Fixity service will also recalculate the message digest and compare with the stored value. If either of these checks results in a discrepancy, Merritt staff will be notified, so they can take preservation action to restore the uncorrupted state of the file using replica copies.

Please read the draft specification, and let us know any thoughts you have in response. In particular, please consider these questions: