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Present a content integrity service for objects in a digital museum, especially for objects stored in long-term digital archives. The goal of the service is to demonstrate that the information in the archive is authentic and has not been unintentionally or maliciously altered even after its bit representation in the archive has undergone one or more transformations. The service is based on one-way hashing and digital time-stamping procedures. The benefit of the algorithm is that it erases the effect of PKI, which enables the algorithm's performance to be built entirely on hash function's property. Based on this, we can certify the documents' content integrity as well as that of the time-stamp itself.