DeDa: A DeFi-enabled Data Sharing and Trading System.

Without relying on centralized intermediaries to participate in financial services such as exchanging and lending assets, Decentralized Finance (DeFi) has set off a new paradigm of asset self-management. On the other hand, data as an emerging asset becomes increasingly significant in our daily life. How to self-manage our data assets to raise their value deserves further exploration. Inspired by DeFi, we envision a decentralized eco-system/community where people can donate or trade data end-to-end for the public good and/or maximize data value. This paper explores this vision by building a DeFi-based data sharing and trading system. In order to explore the actual value of data in the market, we propose an elastic data pricing scheme that can dynamically adjust data prices based on data usage and timing. Finally, we implement and integrate these critical components into a prototyping system deployed onto Ethereum - the current leading blockchain system, and evaluate the system service performance, smart contracts functionality, and the robustness of the data pricing scheme.