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Chronopolis uses several technologies to package, ingest, distribute, track, and crypotgraphically verify data. ChronCore manages ingests and replications throughout the Chronopolis system. ACE employs cryptograpic methods to ensure and detect data fixity. BagIt packages Chronopolis data into a standard format, and the DuraCloud interface is used to deposit data into the Chronopolis system. 


ChronCore code on Gitlab

ChronCore packages and distributes data securely throughout the system, providing several levels of bit auditing to ensure that nothing is lost in transmission. ChronCore consists of three services: intake, ingest, and replication. Currently only the UCSD library node runs the intake and ingest services, which package, record, and stage data for replication. All partner sites run the replication services, which poll the ingest service hourly to determine if new collections have been staged for replication.


ChronCore Diagram



ACE code on Gitlab

All data in the system undergo constant integrity monitoring using the Audit Control Environment (ACE). ACE incorporates a new methodology to address the integrity of long-term archives using rigorous cryptographic techniques. ACE continuously audits the contents of the various objects according to the policy set by the archive, and provides mechanisms for an independent third-party auditor to certify the integrity of any object.




Chronopolis uses the BagIt packaging protocol to transfer data into its storage locations. BagIt is a hierarchical file package structure for the exchange of generalized digital content. A "bag" has just enough structure to safely enclose tag files (metadata) and a payload (the data to be preserved) but does not require any knowledge of the payload's internal semantics. This BagIt protocol is suitable for disk-based or network-based file package transfer. 



Chronopolis partners with DuraCloud to offer streamlined data deposit into our preservation storage centers. Please contact the Chronopolis team for more information.