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Requirements from LTANS include all timestamps necessary to verify existence data structure can efficiently provide evidence for many archived data objects possible to provide evidence for data groups even within groups, non-rep proof for single object still possible deletion possible without affecting proofs of other data objects time-stamping possible without accessing data objects; only access data when hash alg becomes weak single location of all hash algorithms applied possible to include evidence and data within one structure or separately possible to archive encrypted data and allow integration of encryption info within evidence record possible to integrate additional info within the evidence record |