基于门限签名的分布式预言机链下共识方案  

Off-chain consensus scheme of distributed oracles based on threshold signature

作　　者：孙舟 祝秀山 刘祥路 陈振 袁小溪 SUN Zhou;ZHU Xiu-shan;LIU Xiang-lu;CHEN Zhen;YUAN Xiao-xi(Electric Power Research Institute,State Grid Beijing Electric Power Company,Beijing 100075,China)

机构地区：[1]国网北京市电力公司电力科学研究院,北京100075

出　　处：《计算机工程与设计》2023年第1期37-44,共8页Computer Engineering and Design

基　　金：国家电网公司科技基金项目(52020121001V)。

摘　　要：为解决现有分布式预言机网络链上共识方案存在的区块链网络压力大、共识效率低等问题,提出一种基于门限签名的分布式预言机链下共识方案。基于(t,n)门限签名技术和Schnorr签名算法,设计包含密钥生成、签名生成、签名验证和预言机奖励4个阶段的共识流程。各预言机节点在链下达成共识后,由一个节点将聚合后的单一数据和可验证签名发送到区块链,在保证上链数据可信性的同时,减缓了区块链网络压力,提高了共识效率。给出方案实施的具体步骤并证明方案的正确性和安全性。实验结果表明,该方案具有较好的有效性和实用性。To solve the problems of high blockchain network pressure and low consensus efficiency in the existing on-chain consensus scheme of distributed oracles,an off-chain consensus scheme of distributed oracles based on threshold signature was proposed.Based on(t,n)threshold signature technology and Schnorr signature algorithm,the consensus process including key gene-ration,signature generation,signature verification and rewarding oracles was designed.After the oracles reached a consensus off the blockchain,a unified oracle sent the aggregated data and a verifiable signature to the blockchain,which not only ensured the credibility of the data,but alleviated the pressure of the blockchain network and improved the consensus efficiency.Detailed operation steps were given and the correctness and safety of the presented scheme was proved.Experimental results show that the scheme has good effectiveness and practicability.

关 键 词：区块链 分布式预言机 链下共识方案 门限签名 Schnorr签名算法 数据聚合 可验证签名 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]