A Review on Open Data Storage and Retrieval Techniques in Blockchain-based Applications

Open data is a new trend in which researchers and organizations have made their data freely and publicly available in recent years. Although open data offers several advantages, including transparency, service improvement, value chain creation, and development of businesses, it faces single point of failure challenge. Moreover, there is no solution to maintain integrity and trustworthiness of the open data presented. Blockchain technology is a secure platform for storing and retrieving open data to address these challenges, however, there are challenges to blockchain-based open data research that require further investigation. In this paper, firstly, we study several applications presented in the area of blockchain-based open data research, and then prepare a taxonomy of complementary techniques that have been applied to address the open data challenges. The proposed taxonomy prepares proper knowledge for organizations to decide which complementary techniques of open data storage and retrieval can meet their requirements. In conclusion, we show smart contracts and Internet of Things (IoT) are outstanding complementary techniques for data storage and retrieval that have been applied in a wide range of blockchain-based open data research.