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We note and store the filesize of each file as it is submitted to Merritt. Curators may also include a message digest value for their content during submission. If none is supplied, Merritt will automatically compute a SHA-256 digest during ingest processing.

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.