Eder J. Scheid, Manuel Keller, Muriel Figueredo Franco, Burkhard Stiller
Current projects applying blockchain technology to enhance the trust of NFV environments do not consider the VNF repository. However, the blockchain’s properties can enhance trust by allowing to verify a VNF package’s integrity without relying (a) on a Trusted Third Party (TTP) for remote attestation or (b) a secure database. This paper presents BUNKER , a Blockchain-based trUsted VNF packagE Repository, intended to be integrated with traditional database-based package verification environments, acting as a trusted repository containing VNF package information. Moreover, BUNKER allows users to acquire VNFs without the need of a TTP using an Ethereum Smart Contract (SC). The SC automatically transfers license fees to the vendor once a VNF is acquired, and sends the VNF package’s link to the buyer before verifying its integrity.
Today more and more enterprises and individuals are outsourcing their data to cloud storage system. Data deduplication is one of the important technologies to reduce the storage cost of cloud storage system. In a cloud storage system with deduplication technology, the client can outsource the data files to the cloud storage server and pay for them. Fair payment is one of key issues in the cloud deduplication storage system. At present, a variety of secure deduplication encryption schemes have been designed to protect the privacy of client data. However, most existing fair payment solutions use traditional electronic cash systems to generate payment tokens, which requires a trusted authority to prevent double-spending. Trusted authorities will become bottlenecks in the payment system. Faced with this problem, in this paper, we propose a new decentralized fair payment protocol for cloud deduplication storage system by utilizing ethereum blockchain technology. The new protocol takes advantage of the decentralization of blockchain technology, allowing direct transactions without the participation of trusted third parties. In the new protocol, if a malicious situation occurs, the system can guarantee fair payment by pre-storing penalty money in the smart contract. Safety analysis and experimental analysis show that our new protocol is feasible.
K. Rajeswari Amrita B. Chavan Amrita B. Chavan, TJPRC
a showcase of ethereum Dapps, where the encryption keys are prolonged and open just to the end client. The client can also share the reports safely with various clients that they pick. Also the ID document will be stored in the hash format. The solidity smart contracts help to make tamper-proof records. It provides animmutability.
This research represents a model of buying and selling lotteries system on Blockchain by using Ethereum network to determines the conditions for the purchasing of the lottery and reward the prize winner. Our system uses Ethereum coins to buy and reward the prize for convenience in term of speed and also reduce the problems which is unable to be controlled by the government. For example, lottery agents (intermediaries) may sell the lottery at overprice, and reward the winners at a lower than appropriate rate. Additionally, the most important problem is the verification of the real owner of the lottery.
Distributed ledger technology especially in the form of publicly coordinated validation networks such as Ethereum and Bitcoin with their own monetary circles provide for a revealing litmus test for current financial regulatory schemes.The article highlights the interrelation between distributed coordination and the emission of virtual currency to make sense of the function of the new monetary phenomenon.It then argues for the regulation of financial services on the ground of the technology to ensure integrity standards.In this respect, it is useful to gear the development of a regulatory scheme towards the existing financial regulatory principles.However, future measures of the regulators must take the distributed nature of the platforms into account by relying on a "regulated self-regulation" of the community.Finally, the article focuses on the shortcomings of the current EU regulatory regimes, especially the regulation frameworks regarding financial services, payment services and electronic money. I.
Sin duda el blockchain ha sido uno de los inventos mas revolucionarios de esta decada. Desde grandes empresas hasta equipos de investigacion dedican sus esfuerzos a estudiar esta tecnologia e investigar nuevas formas de utilizarla y mejorarla. Desde el punto de vista de la ingenieria informatica tiene especial interes un blockchain en particular, el de Ethereum. En un momento en el que las criptodivisas se encontraban en auge y parecia que la utilidad del blockchain se limitaba a la creacion de estas, Vitalik Buterin y su equipo presentaron Ethereum, un blockchain que mantiene una maquina virtual de proposito general. Las expectativas de la sociedad sobre este blockchain eran altisimas y se esperaban hazanas como la de ser el nuevo internet. Esta situacion de euforia colectiva distorsiona la realidad y hace que parezca imposible realizar un proyecto sobre Ethereum sin que este tenga que suponer un gran cambio. Sin embargo, como Vitalik Buterin comento en Deconomy, “la tecnologia blockchain por si sola es un ordenador y una base de datos mucho menos eficiente que la tecnologia que existia hace cuarenta anos” [54]. El objetivo de este proyecto es determinar que se puede esperar de Ethereum actualmente y en que debe mejorar antes de poder cubrir las expectativas tan altas que se tienen de este blockchain. Este objetivo se conseguira a traves del analisis de la tecnologia blockchain y de las tecnicas que permiten que dentro del blockchain de Ethereum haya una maquina virtual.
V diplomskem delu smo raziskali, kateri izmed sistemov za porazdeljeno in decentralizirano shranjevanje datotek je ucinkovitejsi. Taksni sistemi nudijo alternativen nacin shranjevanja in prenosa datotek, pri katerem se izognemo centralnemu subjektu. Implementirali smo aplikacijo s pametno pogodbo, v katero se shranjujejo zgoscevalne vrednosti datotek, ki jih naložimo v omrežji Ethereum SWARM ali IPFS in po potrebi prenesemo s pomocjo zgoscevalne vrednosti, ki služi kot naslov datoteke. Nato smo testirali, kateri izmed sistemov je zmogljivejsi, preprostejsi za uporabo in hitrejsi pri prenosu datotek.
This research is an attempt at deepening the understanding of hyped cryptocurrencies. A deductive nature is used where we attempt to estimate the linear dependencies of cryptocurrencies with four different time series models. Investigating linear dependencies of univariate time series offers the reader an understanding on how previous prices of cryptocurrencies affect future prices. The linear interdepencies for a multivariate scenario will provide an apprehension on how, and if, the cryptocurrency market is correlated. The dataset used consists of the prices between January 1, 2016 to March 31, 2019 of the four cryptocurrency rivals: Bitcoin, Ethereum, Ripple and Litecoin. The modeling is performed by using autoregression and fitting on 80% of the data. Thereafter, the models are forecasted on the last 20% of the data in order to test the accuracy of the model. The four types of model are used in this thesis and are named by the abbreviations AR(p), MSAR(p), VAR(p) and MSVAR(p) where AR(p) represents an autoregressive model of order p; MSAR(p) represents a Markov-Switching autoregressive model of order p; VAR(p) represents a multivariate model for of the AR(p) also known as the vector autoregressive model of order p; finally MSVAR(p) stands for a Markov-Switching vector autoregressive model of order p. As cryptocurrencies are said to be very volatile, we hope that the Markov-Switching approach would help to classify the level of volatility into different regimes. Further, we anticipate that the fitted time series for each regime will offer a greater accuracy than the regular AR(p) and VAR(p) models. By using scale-dependent error estimators, the thesis concludes that the Markov-Switching approach does in fact improve the efficiency of chosen time series models for our cryptocurrencies.
Cryptocurrencies are digital assets desig ned to work as a medium of exchange that uses cryptography to secure its transactions, to control the creation of additional units, and to verify the transfer of assets. In the past few years there is a growing number of cryptocurrencies like Bitcoin, Ethereum, Ripple, etc. In my paper and presentation I would like to present the difficulties of the legal classification of cryptocurrencies. Countries all over the world have different solutions to this question. It is not written in stone whether cryptocurrencies should be considered a currency, a commodity, or an investment. In my study I examine each of these possibilities.
Penelitian ini betujuan untuk mengetahui pengaruh dari US Dollar dan Dow Jones Industrial Average (DJIA) terhadap bitcoin dan etherem serta mengetahui kemampuan asset hedge dari bitcoin dan ethereum terhadap US Dollar dan Dow Jones Industrial Average. Metode yang digunakan pada penelitian ini adalah metode kuantitatif dengan menggunakan metode Vector Autoregressive (VAR).Hasil dari penelitian ini adalah bahwa bitcoin dan ethereum tidak dipengaruhi oleh US Dollar dan Dow Jones Industrial Average (DJIA) karena kedua variabel ini tidak berpengaruh secara signifikan terhadap bitcoin maupun ethereum sehingga bitcoin dan ethereum memiliki kemampuan asset hedge terhadap US Dollar dan Dow Jones Industrial Average (DJIA)
Technological advancement provides enhancements to various sectors of interpersonal relations. In this scenario, we highlight the integrated use of two different technologies, artificial intelligence and ethereum's blockchain smart- contracts. When allied, such technologies present not only advances, but also challenges to the law regarding its most appropriate treatment in the legal world. The aim of this paper is to verify the legal possibility of attributing personality to these figures when worked together. Such reflections are relevant, given that these technologies, despite their embryonic stage in relation to the use by the general public, have the potential of wide use, which leads to the likelihood of complications related to legal relationships that tangent the context. This means that it is necessary for the Law to consider models that allow the securitization of rights and, above all, of duties and obligations, so that consequences of illicit (civil, in this case) and civil liability can be imputed. Therefore, the definition of the eventual embodiment of functional structures of artificial intelligence in a blockchain is a previous step, of essential confrontation. As a theoretical framework we take Teixeira de Freitas and his notorious development of the theories of personification. The methodology employed consists in the legal- dogmatic analysis of current legislation and legal norms so that, in integration with other sources of law, they can unveil an interdisciplinary theoretical- argumentative arsenal capable of answering the question about the personification in question.
Tehnologija verig blokov je omogocila nov nacin zbiranja zagonskih sredstev. Gre za t. i. zacetno prodajo kovancev, ki pa je prisla z dolocenimi pomanjkljivostmi, zaradi katerih je prihajalo do prevar. Da bi se temu izognili, je nastal izboljsan koncept prodaje žetonov, ki ga imenujemo decentralizirana zacetna prodaja kovancev. V magistrskem delu smo se spoznali z razlicnimi nacini zbiranja zagonskih sredstev ter platformami, ki to omogocajo. Nato smo tudi sami implementirali pametne pogodbe za decentralizirano zacetno prodajo kovancev na platformi Ethereum.
I. H. Yano, A. de Castro, Francisco Carlos da Silva, Geraldo Magela de Almeida Cançado
O objetivo deste trabalho é apresentar a implementação de um contrato inteligente em uma rede privada Ethereum Blockchain, de forma a tornar possível o uso desta rede nos mais diversos tipos de aplicação, principalmente nos casos de rastreabilidade; neste caso, foi escolhido como exemplo a possibilidade de rastreamento de caixas de manga.
After its introduction the smart contract platforms got practical use when they become key part of the Ethereum public blockchain and defined the concept of distributed applications (dApps). Smart contract platforms, based on distributed ledger technologies (DLT), are used in various industries such as banking, government and law, healthcare, insurance, and transportation. One area of a DLT and smart contracts could also be used is the area of the software lifecycle management (SLM). Complex SLM procedures involve many parties such as customer, software provider, technical and business consultants, auditors, hardware providers, third party software vendors, and others. In this paper we investigate the applicability of DLT-based smart contract platforms to support multi-party SLM processes for complex customer systems, components of which are running on premise, in the cloud and on edge devices.