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Fixity is a method to test for file integrity and corruption. The Fixity service will verify the bit-level integrity of files managed in the Merritt Repository with a two-part test: Is the filesize of each file unchanged? Is the message digest value of each file unchanged?

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.