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Archive Time-Stamp Archive Time Stamp hash-tree (Merkle) time-stamp containing digital signature single time-stamp for many data objects Initial Stamp event: after document is archived collect hash values of many documents and build tree, request time-stamp store archive time-stamp renew if necessary Reduction to Archive Time-Stamp necessary hash values for verification + time-stamp {SEQUENCE of SEQUENCE of OCTET STRING time-stamp} Hint: each Sequence Of Octet String is one layer of the tree SEQ1[2] SEQ2[1] |