In this paper, we introduce FileShare-a secure decentralized application framework for sharing files and data provenance. It overcomes the integrity and ownership issues in the existing solutions for file sharing and data provenance. In proposed framework, a Decentralized Application (dApp) on top of Ethereum is responsible for user registration and for provenance purposes. Ethereum smart contract is used to govern, manage, and provide traceability and visibility into the history of the shared content from its origin to the latest version. It employs IPFS, a distributed file system, as its data storage layer, avoiding the pitfalls of centralized storage solutions. The proposed framework utilizes an inbuilt editor to view and modify files. The files will be stored in an encrypted form on IPFS and can only be accessed in the FileShare text editor. Modify and share operations performed on shared files are recorded separately to the blockchain, ensuring high integrity, resiliency, and transparency.

While cryptocurrencies like Bitcoin have the potential to break traditional financial barriers, there are growing concerns about such currencies being used to fund illegal activities. Blockchain keeps the complete history of all transactions ever performed and each node replicates it. The humongous data it contains can be analyzed to gain useful insights about user transactions as well as the blockchain as a whole. In this paper, we propose an approach to parse and visualize the data of Bitcoin blockchain in a graph structure and carry out analysis that includes tracking and tracing, address clustering and entity tagging. We also try to find patterns in the data at a macro level to provide insights about the overall system. Thus, these efforts lead to foundation work for an analysis tool for getting insights on the coin flow of any financial system including cryptocurrencies.