基于门限聚合签名的区块链预言机数据传输模型

Blockchain Oracle Data Transmission Model Based on Threshold Aggregation Signature

针对区块链预言机方案存在数据存储成本较高,时间效率较低,不能防止恶意预言机节点传输错误数据等问题,提出一种基于门限聚合签名的区块链预言机数据传输模型。首先,将签名与数据聚合到一个预言机上,与链上智能合约进行单次交互,减少区块链存储空间开销和通信负载;其次,在Schnorr聚合签名中加入门限机制,提高签名时间效率;最后,使用多个预言机收集数据,并设置积分制选举出可信的签名聚合预言机,防止部分恶意预言机的行为,保证数据真实可靠。实验结果表明,相比BLS聚合签名和未加入门限机制的Schnorr聚合签名,Schnorr门限聚合签名验证消耗的时间更少,使用户能够更快地获取链下数据并进行传输。

In view of the problems of high data storage cost,low time efficiency,and inability to prevent malicious oracle nodes from transmitting incorrect data,a blockchain oracle data transmission model based on threshold aggregation signature was proposed.Firstly,the signature and data were aggregated on an oracle,and a single interaction with the smart contract on the chain reduced the blockchain storage space overhead and communication load.Secondly,a threshold mechanism was added to the Schnorr aggregate signature to improve the efficiency of signature time.Finally,multiple oracles were used to collect data,and a point system was set up to elect a credible signature aggregation oracle to prevent the behavior of some malicious oracles and ensure the reliability of the data.The experimental results showed that the Schnorr threshold aggregation signature consumed less time than the BLS aggregation signature and the Schnorr aggregation signature without threshold mechanism,which enabled users to obtain off-chain data and transmit it more quickly.