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Data is routinely created, disseminated, and processed in distributed systems that span multiple administrative domains. To maintain accountability while the data is transformed by multiple parties, a consumer must be able to check the lineage of the data and deem it trustworthy. If integrity is not ensured, the consequences can be significant, particularly when the data cannot easily be re-produced. Verifying the provenance of a piece of data generated using inputs from multiple administrative domains is likely to require the use of numerous public keys that originate at external institutions.
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