BSMD:A blockchain-based secure storage mechanism for big spatio-temporal data

As more and more mobile devices and IoT terminals are connected to the Internet, a huge amount of spatio-temporal data is generated. In order to cope with the pressure of storing and computing massive amounts of data locally and to share data to fully utilize its value, data owners usually store data in cloud servers. However, the data owner will lose physical control of big spatio-temporal data while the big spatio-temporal data is stored on the cloud, and it will be at the risk of being tampered with and deleted. Therefore, this paper designs a blockchain-based secure storage mechanism, BSMD, which adopts an on-chain and off-chain cooperative storage model to alleviate the shortage of blockchain storage capacity. The updatable subvector commitment designed in this paper is used to construct the on-chain and off-chain secure authentication protocol which ensures the consistency of on-chain and off-chain data and makes the protocol have the capability of batch processing. Finally, the correctness and security of the proposed protocol are proved, and the performance of the protocol is analyzed.