Proper

Abstract

Recently, Ethereum decentralized applications use off-blockchain storage interworking techniques in storing large-sized data. However, these techniques have difficulties in user authentication and access control with off-blockchain storage. In this paper, we propose a method of providing a group workspace that can manage large files based on the Ethereum blockchain. To do this, we introduce the system structure for interworking with off-blockchain storage, and propose the process of handling large size files on the Cassandra database. The proposed process supports robust user authentication using user's signature information, and systematic access control for shared resources.