Abstract: This paper proposes a new optimistic fair off-line payment scheme for multi-party aggregate P2P transaction, in which no one has advantage over others. The trusted party need not be involved into exchange unless disputes have occurred. The disputes which might occur are analyzed and handling solution is proposed. Analysis results show fairness of the protocol.

Key words: P2P system, aggregate transaction, fairness

摘要： 针对P2P交易环境中的多方组合交易模式，提出一个新的乐观公平的离线支付方案。在该方案中，参与协议的任何一方均不具有优势，信任方不需要在线介入支付过程。分析支付中可能出现的争议，并给出解决方案。分析结果验证了该协议的公平性。

关键词: P2P系统, 组合交易, 公平性

CLC Number: 

• TP309