| http://www.w3.org/ns/prov#value | - C including a balance x, an amount of money X, a signature verification key NU and a bank signature SB on information n including said signature verification key NU, and an amount of payment y all received from said shop; means for making a check to see if there has been registered in said surveillance database said management data n corresponding to said amount of money X and said signature verif
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