摘要：As an emerging decentralized technology, peer- to-peer architecture arises as a new model for distributed computing and transaction, consequently there is a need for a scheme to incorporate payment services in this environment to enable electronic payment via peer-to-peer systems. In this paper, a transferable token is proposed for peer-to-peer payment system, which can float from a peer to another peer. When this kind of token is used, the fraud such as double spending can be found out but the broker need not be involved online in the payment. The optimistic payment protocol for both the basic payment and the cascading payment are presented. The disputes which might occur are analyzed and handling solution is proposed. The arbitrator need not be involved unless disputes have occurs. The optimistic payment scheme is efficient, practical and suitable for peer-to-peer transaction.
