Blockchain has become one of the most important techniques in decentralized cryptocurrency systems. It has drawn much attention from both academia and industrial circles. However, most of the existing blockchain based schemes only support transactions within two parties. In many real world scenarios, a transaction may involve multiple parties, if these parties involved conduct their transactions ruled by traditional blockchain, the communication burden will grow much larger. In this paper, we propose a secure peer to peer multiparty transaction scheme based on blockchain. It allows multiple users to participant in one transaction at the same time by making use of secret sharing mechanism. We illustrate the interactions between each entity in the scheme and present the concrete algorithms. In addition, we conduct formal security proof and performance evaluation comparisons. By analysis, the high security level and favorable performance demonstrate that the proposed scheme is efficient to implement.

区块链已成为去中心化加密货币系统中最重要的技术之一。它引起了学术界和工业界的极大关注。但是，大多数现有的基于区块链的方案仅支持两方之间的交易。在许多现实世界中，交易可能涉及多方，如果这些相关方进行传统的区块链管理的交易，则通信负担将大大增加。在本文中，我们提出了一种基于区块链的安全的对等多方交易方案。通过使用秘密共享机制，它允许多个用户同时参与一个事务。我们说明了方案中每个实体之间的相互作用，并提出了具体的算法。此外，我们进行正式的安全证明和性能评估比较。通过分析，高安全级别和良好的性能证明了该方案是有效实施的。