| 摘要 |
RSP (Repository Service Provider) server 7 receives first data and at least first digital signature for the first data from a TC (Trade Chain) server 3. Next, it performs format conversion corresponding to a destination of the first data, for the received first data to generate second data. Then, it sends a TC server 5, which is associated with the destination, at least the second data generated in the format conversion, a format reverse-conversion program, and the first digital signature. In this way, by sending the format reverse-conversion program and the first digital signature for the first data, for which the format conversion is not performed, it becomes possible to confirm in the TC sever 5 that there is no alteration for the first data and etc. Namely, the TC server 5 can obtain the verification of the TC server 3, which is a transmission source.
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