BTSPD: A Blockchain Based Traceability System for P2P Distribution The application of peer to peer (P2P) technology has brought convenience to people, however, it has caused some social problems such as copyright infringement and the spread of Trojans and viruses. In order to effectively monitor malicious activities and security violations, it is essential to build a data traceability framework, with which each data object in the P2P environment can be tracked and recorded. Blockchain technology provides a promising mechanism for establishing a file distribution traceability system due to the natures, such as openness, decentralization and antitampering. In this article, we propose BTSPD, a blockchain based traceability system for P2P distribution. The related information of P2P seed file is stored in the blockchain to ensure the credibility of the traceability information. InterPlanetary File System (IPFS) is used to store the P2P seed to expand the storage of the fabric blockchain. Based on BTSPD, it becomes more credible and convenient for tracking security of P2P distribution. Implemented based on the Hyperledger Fabric, the experiment results show that BTSPD can work well and support normal P2P distribution.

A Novel Exploration for Blockchain in Distributed File Storage Distributed file storage provides reliable access to data through redundancy spread on distributed nodes. Various application scenarios emerge, such as include data centers, storage in wireless networks and peertopeer storage systems. Storing data by using code, such as an erasure code, calls for less redundancy compared with simple replication in terms of reliability. Nevertheless, since data fragments are periodically replaced when some nodes fail, a key acute question is how to generate encoded data fragments in a distributed way when transferring as little data as possible over the network. For a coded system, a new node to repair from a node failure is to download subsets of data from some surviving nodes, reconstructs some lost coded blocks by using the downloaded fragments, and stores them at the new node. This procedure is not optimal. In this paper, we introduce blockchain to protect distributed data in terms of node failure and etc. We show that blockchain can significantly improve the integrity and credibility in distributed file storage systems. Furthermore, we harvest theory discovery of blockchain in distributed file storage system.