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In order to provide bit-level preservation, we use the Audit Control Environment Audit Manager to run periodic fixity checks on Bags stored in Chronopolis. The ACE Audit Manager web application gives us two levels of verification when doing our checks: the first is that the file is valid, and the second is that the digest for the file is valid.
In addition, there is timestamp information stored in the ACE Tokens which serves as a piece of provenance for when a file was first validated by Chronopolis.
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