Fair Exchange E-Commerce Protocol for Multi-Chained Complex Transactions

Cătălin Bîrjoveanu, Mirela Bîrjoveanu


In this paper, we introduce the concept of chained transaction as a transaction in which the customer obtains a physical product from a provider using one or more active intermediaries (brokers). Even if there are many multi-party fair exchange protocols with applications in buying digital or physical goods, digital signature of contracts and certified e-mail, no one can be used to solve our problem: complex transactions in which a customer wants to buy several physical products, where each product is acquired in a chained transaction, providing fair exchange. In this paper, we propose the first solution to the problem mentioned above. Our protocol is optimistic and provides fairness, timeliness, non-repudiation and confidentiality.


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