| http://www.w3.org/ns/prov#value | - The communication network 1 is the Internet, the user information processor 2 is a user terminal, the mediator information processor 7 is a sales center terminal, the authentication information processor 3 is a credit card company terminal, the portable recording medium 6 is a credit card, and the authentication number is a credit card number. [0048] A transaction system according to aspect 12 use
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