A new efficient micropayment scheme against overspending

We propose a new micropayment scheme in which possible overspending is radically reduced by the adoption of probabilistic polling in a transaction. On the other hand, the losses caused by a dishonest overspending consumer must be shared by banks and merchants, furthermore, an iterative interactive payment protocol is performed which protects the profits of both consumers and merchants. Compared with PayWord, the fairness of our scheme is much higher and restricted anonymity of a customer is provided.