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Easing DApp Interaction for Non-Blockchain Users from a Conceptual Modelling Approach

Blockchain decentralized applications (DApp+IBk-s) are applications which run on blockchains nodes. Thus, to interact directly with this sort of applica-tions, users need to have a blockchain address, wallet, and knowledge about how to make transactions to interact with DApp+IBk-s. Therefore, the knowledge required to use a DApp can easily make users to desist when trying to interact with them. To tackle this issue, we propose a software ar-chitecture that will be in the middle of the user and the DApp, thus making users initially unaware of the fact that they are interacting with a DApp. This is achieved by analyzing the relationship between DApps and Apps by using UML modelling. Next, based on the previous analysis, we created a middleware for users to interact with a DApp in the same manner they do with a traditional web app, i.e., by using usernames, passwords and user in-terface elements instead of addresses, private keys or transactions. To put the developed middleware into practice, we developed a DApp that makes use of it. This DApp registers the time control of workers from companies by using blockchain to store the data in a secure and non-modifiable man-ner. Finally, we performed an experiment, thus demonstrating that a DApp that implements the proposed middleware would improve its usability for users with no experience with blockchain.

Autores: Miguel A. Teruel / Juan Trujillo / 
Palabras Clave: Blockchain - Clockchain - conceptual modelling - DApp - Ethereum - Middleware - Quorum - Smart Contract - Solidity - UML

Achieving software-assisted knowledge generation through model-driven interoperability

A software system is a complex artefact involving several aspects, such as requirements and behavioural workflows. Information systems engineering has generated several approaches to create software models reflecting these aspects. To obtain the necessary integration, the relations between the involved models must be expressed formally. Currently, this necessity is particularly evident in systems built to assist users in performing knowledge generation, such as scientific knowledge-management systems. Model-Driven Engineering provides some interoperability techniques for expressing inter-model relations. In this paper, a specific metamodel is proposed for integrating different modelling perspectives of software systems built for assisting users in knowledge generation. Furthermore, the integration metamodel is initially validated through its application to the integration of modelling perspectives of a system to assist knowledge generation in the cultural heritage domain. The integration metamodel proposed allows the system to make knowledge generation decisions by manipulating the relations between the involved models on behalf of the user.

Autores: Patricia Martín-Rodilla / Giovanni Giachetti / Cesar Gonzalez-Perez / 
Palabras Clave: conceptual modelling - cultural heritage - interoperability - knowledge generation - MDE - software assistance

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