A secure multi-party payment channel on-chain and off-chain supervisable scheme

With the increasing demand for digital currencies and other blockchain transactions, the contradiction between the growing demand and the limited blockchain space has become increasingly prominent, and the scalability of the blockchain urgently needs to be resolved. The existing off -chain payment channel solutions do not give enough consideration to the multi -party parallel transaction process, and the transaction process lacks supervision, making it difficult to meet the actual demand. In this paper, we propose a multi -party secure, flexible, concurrent and supervisable off -chain payment channel scheme. Our scheme not only optimizes the current transaction process so that the participants and channel balance within the channel can be flexibly changed without affecting the normal transaction process, but also designs a multi -level collaborative supervision mechanism from multiple perspectives of positive and negative, active and passive, and multiple layers of on -chain and off -chain to ensure the safety and convenience of the transaction process. The security of the scheme was also analyzed, especially the possible collusion in the channel. We simulated the operation of the channel in the blockchain simulation and testing software Simblock and tested the scheme from various aspects. The experiments show that our scheme is able to achieve secure supervision within the channel with a modest overhead (about 15%). Testing of the mentioned smart contracts further illustrates the feasibility of the scheme.