This paper presents an initial exploitative study of how the relational and blockchain databases compare in defining and deploying data structures,populating these with new entries, and retrieving the relevant data for further use. The aim of this study is to better inform the software developers in general and the distributed application developers in particular.

Blockchains are gaining a substantial recognition as an alternative to the traditional data storage systems due to their tamperingresistant and decentralized storage, independence from any centralized authority, and low entry barriers for new network participants. Presently blockchains allow users to store transactions and datasets, however they don't provide an easy way of creating and keeping relationships between data entities. In this paper we demonstrate a solution that helps software developers maintain relationships between inter-related data entities and datasets in a blockchain. Our solution runs over Ethereum's Go implementation. This is the first step towards a database management-like middleware system for blockchains.

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