Visual emulation for Ethereum's virtual machine

In this work we present E-EVM, a tool that emulates and visualises the execution of smart contracts on the Ethereum Virtual Machine. By working with the readily available bytecode of smart contracts we are able to display the program's control flow graph, opcodes and stack for each step of contract execution. This tool is designed to aid the user's understanding of the Etheruem Virtual Machine as well as aid the analysis of any given smart contract. As such, it functions as both an analysis and a learning tool. It allows the user to view the code in each block of a smart contract and follow possible control flow branches. It is able to detect loops and suggest optimisation candidates. It is possible to step through a contract one opcode at a time. E-EVM achieved an average of 85.6% code coverage when tested

A Comparison of Approaches for Visualizing Blockchains and Smart Contracts

The use of blockchains and smart contracts is currently explored in various fields of science and engineering due to their potential of radically changing the ways of doing business and the assumed elimination of traditional legal entities. Thereby, the complexity of the underlying technical relationships and mechanisms typically hampers the understanding by non-technical experts. In this paper we review approaches for visualizing blockchains and smart contracts. The investigation focuses on design and analysis approaches, concluding with requirements for a visual modelling language

New Innovations in eIDAS-compliant Trust Services: Blockchain

Los avances tecnológicos van a pasos agigantados, con ellos marcan nuevas tendencias que emergen para dominar el mercado, productos que antes era novedosos y que ahora deben adaptarse para seguir siendo competitivos. Por ello, el equipo compuesto por 3 estudiantes de la FIB ¿ UPC (Arthur Bernal, Marc Méndez y Xiaolei Lin) y dirigido por el profesor y director Francisco Jordan proponen en este proyecto nuevas tecnologías innovadoras que marcará el futuro tecnológico e incorporarlo en el producto TrustedX. Este proyecto se dividirá en dos partes, la primera que es la parte comuna es realizada por todos los integrantes del equipo y la segunda, la parte individual la realiza solo el autor de esta tesis. La parte comuna se basa en expandir e incorporar los componentes necesarios en el producto TrustedX on-premise para que pueda funcionar como TrustedX as a Service (TXaaS) y un sistema multi-tenant. Este nuevo producto tendrá la capacidad de cumplir los Reglamentos de eIDAS para ofrecer firmas digitales en el Cloud y tener la misma validez que las firmas notariales manuscritas. La parte individual consiste en crear un prototipo de archivado basado en timestamp utilizando la tecnología Blockchain e integrarlo en TXaaS. Para ello, se estudia el funcionamiento de esta tecnología y las diferentes opciones disponibles en el mercado. Además, se diseña e implementa todos los componentes requeridos para cumplir el objetivo.Technologies advance in leaps and bounds, they mark new trends that emerge to dominate the market, products that were previously novel and nowadays that must be adapted to remain competitive. For this reason, the team, that is made up of 3 students from the FIB - UPC (Arthur Bernal, Marc Méndez and Xiaolei Lin) and is led by the professor and director Francisco Jordan, proposes in this project new innovative technologies that will mark the technology of future and incorporate it into the TrustedX product. This project will be divided into two parts. The first consists of the communal part, which is carried out by all team members and the second, is the individual part that is realized only by the author of this thesis. The common part is based on expanding and incorporating all necessary components in the TrustedX on-premise product in order that it can function as TrustedX as a Service (TXaaS) and a multi-tenant system. This new product will have the ability to comply with eIDAS Regulation to offer digital signatures in the Cloud and have the same validity as the handwritten notarial signatures. The individual part consists of creating a timestamp-based archiving prototype by using Blockchain technology and, integrating it into TXaaS. To fulfill with this, the operation of this technology and the different available options in the market are studied. In addition, all components which are required will be designed and implemented in order to rach with the objective

Recent Development of Hybrid Renewable Energy Systems

Abstract: The use of renewable energies continues to increase. However, the energy obtained from renewable resources is variable over time. The amount of energy produced from the renewable energy sources (RES) over time depends on the meteorological conditions of the region chosen, the season, the relief, etc. So, variable power and nonguaranteed energy produced by renewable sources implies intermittence of the grid. The key lies in supply sources integrated to a hybrid system (HS)

Social Work and Sustainable Development Goals: Role of Social Workers in Improving Well-Being for Residents of Nursing Homes in Malaysia

The traditional role of social work includes but not limited to addressing issues of inequality, violence, substance abuse, isolation, discrimination and social well-being. The values and principles of the SDG are geared towards the creation of a cohesive and equitable society in a more transformative manner. In addressing social well-being, nursing homes are set up for people who do not need to be hospitalize but cannot be cared for at home. These people are supposed to be managed by professional and skilled nurses, doctors and social workers. As such, this study focuses on the services and advocacy of social workers to help nursing homes achieve an improved sense of well-being. To get relevant data, Google Scholar was used as a tool to access the major databases provided by Tailor and Frances, Emerald, Elsevier, Springer, Sage and others. The study found that the service and advocacy of social workers produce a significant impact on the individuals at nursing homes. The study contributes to knowledge by critically exploring and synthesizing the role of social work in response to welfare services to reduce inequality, enhance good health and wellbeing of the people in nursing homes as indicated in SDGs 3 and 10