Design of Blockchain System for Protection of Personal Information in Digital Content Trading Environment

The Blockchain, which has attracted attention as the core technology of the fourth industrial revolution, is a form of distributed database as an open ledger. It has the characteristics of integrity, transparency, and confidentiality, and it is currently applied in various fields such as logistics, automobiles, industries, and medical care. Especially in the environment of trading digital content, which is an important asset in the information age, blockchain is attracting attention as a new solution to solve the existing problems(illegal copying, profit distribution, forgery, etc.). However, when the blockchain is integrated into the digital content trading environment, it is difficult to upload the content to the blockchain network due to the limited capacity of the blockchain. In addition, since the integrity and transparency of blockchain is pointed out as a weak point in terms of personal information, it is not suitable for incorporating blockchain into this environment. In this paper, we propose a blockchain, the SBBC(Secret Block based BlockChain), which solves the existing problems of blockchain and digital content trading environment. And we will build a safe and reliable digital content trading environment using WBFT(Weight of authentication Byzantine Fault Tolerance), a consensus algorithm used in the environment.