The shared storage is essential in the decentralized system. A straightforward storagemodel with guaranteed privacy protection on\nthe peer-to-peer network is a challenge in the blockchain technology.The decentralized storage system should provide the privacy\nfor the parties since it contains numerous data that are sensitive and dangerous if misused by maliciously. In this paper, we present a\nmodel for shared storage on a blockchain network which allows the authorized parties to access the data on storage without having\nto reveal their identity. Ring signatures combined with several protocols are implemented to disguise the signer identity thereby\nthe observer is unlikely to determine the identity of the parties.We apply our proposed scheme in the healthcare domain, namely,\ndecentralized personal health information (PHI). In addition, we present a dilemma to improve performance in a decentralized\nsystem.
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