Yang menjadi pokok permasalahan dalam penelitian ini adalah mengenai fenomena Cryptocurrency dalam pandangan hukum Islam. Dari judul tersebut dapat ditarik beberapa rumusan masalah yakni: 1.) Apa itu Cryptocurrency dan cara penggunannya? 2.) Mengapa terjadi Pro dan Kontra dalam Masyarakat terhadap Cryptocurrency, 3.) Bagaimana pendapat Hukum Islam tentang Cryptocurrency. Dalam menjawab permasalahan tersebut, metodologi yang digunakan peneliti adalah pendekatan Normatif Syar’i. Peneitian ini tergolong penelitian Library Research, dengan menggunakan Metode Analisis Deskriptif Kualitatif yang berfokus pada Fenomena Cryptocurrency dalam Pandangan Hukum Islam. Sumber data diambil melalui Sumber data primer berupa Buku, Arsip, dan Literatur lainnya.Cryptocurrency dapat digunakan sebagai alat pembayaran, Investasi, maupun Trading. Beberapa jenis Cryptocurrency selain Bitcoin juga banyak digunakan. Pro dan kontra di masyarakat terjadi akibat perbedaan pendapat mengenai Cryptocurrency. Karena belum ada legalitas mengenai Cryptocurrency sebagai alat pembayaran maupun mata uang yang diakui di Indonesia. Harganya yang Fluktuatif serta keamanannya yang masih terdapat cela membuat perdebatan mengenai Cryptocurrency seperti pada Bitcoin belum mencapai titik terang. Dalam Perspektif hukum islam, sebagian Ulama berpendapat bahwa bentuk mata uang digital ini tidak mempunyai kejelasan dan tidak dapat dilihat fisiknya memungkinkan terjadinya penipuan menjadikan Cryptocurrency mengandung unsur Gharar. Kemudian penggunaan Cryptocurrency dalam Investasi maupun Trading menjadikannya tidak lepas dari spekulasi mengenai harganya yang sangat Fluktuatif dan hanya digunakan sebagai alat untung rugi maka Cryptocurrency mengandung unsur Maysir. Karena urgensi mata uang Kripto ini sangat luas terutama dalam cakupan teknologi dan ekonomi, diharapkan skripsi ini juga dapat menjadi referensi untuk perkembangan Cryptocurrency di masa yang akan datang.Keywords: Cryptocurrency, Bitcoin, Hukum Islam.
Cloud auctions provide cost-effective strategies for cloud VM allocation. Most existing cloud auctions simply assume that the auctioneer is trustable, and thus the fairness of auctions can be easily achieved. However, in fact, such a trustable auctioneer may not exist, and the fairness is non-trivial to guarantee. In this work, for the first time, we propose a decentralized cloud VM auction and trade framework based on blockchain. We realize both auction fairness and trade fairness among participants (e.g., cloud provider and cloud users) in this system, which guarantees the interest of each party will not suffer any loss as long as it follows the protocol. Furthermore, we implement our system through the local blockchain and Ethereum official test blockchain, carry out experimental simulations, and demonstrate the feasibility of our system.
The Internet has many backbone components on top of which the whole world is connected. It is important to make these components, like Border Gateway Protocol (BGP), Domain Name System (DNS), and Public Key Infrastructure (PKI), secure and work without any interruption. All of the aforementioned components have vulnerabilities, mainly because of their dependence on the centralized parties, that should be resolved. Blockchain is revolutionizing the concept of today's Internet, primarily because of its degree of decentralization and security properties. In this paper, we discuss how blockchain provides nearly complete solutions to the open challenges for these network backbone components.
Muhammad Ajmal Azad, Samiran Bag, Feng Hao, Andrii Shalaginov
The Internet of Things (IoT) is the network of connected computing devices that have the ability to transfer valued data between each other via the Internet without requiring human intervention. In such a connected environment, the social IoT (SIoT) has become an emerging trend where multiple IoT devices owned by users support communication within a social circle. Trust management in the SIoT network is imperative as trusting the information from compromised devices could lead to serious compromises within the network. It is important to have a mechanism where the devices and their users evaluate the trustworthiness of other devices and users before trusting the information sent by them. The privacy preservation, decentralization, and self-enforcing management without involving trusted third parties are the fundamental challenges in designing a trust management system for SIoT. To fulfill these challenges, this article presents a novel framework for computing and updating the trustworthiness of participants in the SIoT network in a self-enforcing manner without relying on any trusted third party. The privacy of the participants in the SIoT is protected by using homomorphic encryption in the decentralized setting. To achieve the properties of self-enforcement, the trust score of each device is automatically updated based on its previous trust score and the up-to-date tally of the votes by its peers in the network with zero-knowledge proofs (ZKPs) to enforce that every participant follows the protocol honestly. We evaluate the performance of the proposed scheme and present evaluation benchmarks by prototyping the main functionality of the system. The performance results show that the system has a linear increase in computation and communication overheads with more participants in the network. Furthermore, we prove the correctness, privacy, and security of the proposed system under a malicious adversarial model.
Changle Li, Yuchuan Fu, F. Richard Yu, Tom H. Luan · 5 authors
The positioning accuracy of the existing vehicular Global Positioning System (GPS) is far from sufficient to support autonomous driving and ITS applications. To remedy that, leading methods such as ranging and cooperation have improved the positioning accuracy to varying degrees, but they are still full of challenges in practical applications. Especially for cooperative positioning, in addition to the performance of methods, cooperators may provide false data due to attacks or selfishness, which can seriously affect the positioning accuracy. By fully exploiting the characteristics of blockchain and edge computing, this paper proposes a vehicular blockchain-based secure and efficient GPS positioning error evolution sharing framework, which improves vehicle positioning accuracy from ensuring security and credibility of cooperators and data. First, by analyzing the GPS error, a bridge can be established between the sensor-rich vehicles and the common vehicles to achieve cooperation by sharing the positioning error evolution at a specific time and location. Particularly, the positioning error evolution is obtained by a deep neural network (DNN)-based prediction algorithm running on the edge server. We further propose to use blockchain technology for storage and sharing the evolution of positioning errors, mainly to guarantee the security of cooperative vehicles and mobile edge computing nodes (MECNs). In addition, the corresponding smart contracts are designed to automate and efficiently perform storage and sharing tasks as well as solve inconsistencies in time scales. Extensive simulations based on actual data indicate the accuracy and security of our proposal in terms of positioning error correction and data sharing.
Alternative assets, defined by their low correlation with classical financial assets, have become an important investment vehicle in times of negative interest rates and in the aftermath of the global economic and financial crisis. Hedge funds increasingly invest in physical assets such as fine art, wine, or diamonds. Although digital and not physical, cryptocurrencies share many features of alternative assets, but are hampered by high volatility, sluggish commercial acceptance, and regulatory uncertainties. This special issue covers a broad variety of topics in financial technology, and provides a state-of-the-art overview of cryptocurrencies from economic, financial, statistical and technical points of view.
Cyber-physical systems (CPS) is a setup that controls and monitors the physical world around us. The advancement of these systems needs to incorporate an unequivocal spotlight on making these systems efficient. Blockchains and their inherent combination of consensus algorithms, distributed data storage, and secure protocols can be utilized to build robustness and reliability in these systems. Blockchain is the underlying technology behind bitcoins and it provides a decentralized framework to validate transactions and ensure that they cannot be modified. By distributing the role of information validation across the network peers, blockchain eliminates the risks associated with a centralized architecture. It is the most secure validation mechanism that is efficient and enables the provision of financial services, thereby giving users more freedom and power. This upcoming technology provides internet users with the capability to create value and authenticate digital information. It has the capability to revolutionize a diverse set of business applications, ranging from sharing economy to data management and prediction markets. In this paper, we present a holistic survey of various applications of CPS where blockchain has been utilized. Smart grids, health-care systems, and industrial production processes are some of the many applications that can benefit from the blockchain technology and will be discussed in the paper.
Yuanyuan Zhang, Stephen Chan, Jeffrey Chu, Hana Sulieman
The market for cryptocurrencies has experienced extremely turbulent conditions in recent times, and we can clearly identify strong bull and bear market phenomena over the past year. In this paper, we utilise algorithms for detecting turnings points to identify both bull and bear phases in high-frequency markets for the three largest cryptocurrencies of Bitcoin, Ethereum, and Litecoin. We also examine the market efficiency and liquidity of the selected cryptocurrencies during these periods using high-frequency data. Our findings show that the hourly returns of the three cryptocurrencies during a bull market indicate market efficiency when using the detrended-fluctuation-analysis (DFA) method to analyse the Hurst exponent with a rolling window. However, when conditions turn and there is a bear-market period, we see signs of a more inefficient market. Furthermore, our results indicated differences between the cryptocurrencies in terms of their liquidity during the two market states. Moving from a bull to a bear market, Ethereum and Litecoin appear to become more illiquid, as opposed to Bitcoin, which appears to become more liquid. The motivation to study the high-frequency cryptocurrency market came from the increasing availability of higher-frequency cryptocurrency-pricing data. However, it also comes from a movement towards higher-frequency trading of cryptocurrency. In addition, the efficiency of cryptocurrency markets relates not only to whether prices are predictable and arbitrage opportunities exist, but, more widely, to topics such as testing the profitability of trading strategies and determining the maturity of cryptocurrency markets.
Blockchain is evolving to be a secure and reliable platform for secure data sharing in application areas such as the financial sector, supply chain management, food industry, energy sector, internet of things and healthcare. In this paper, we review existing literature and applications available for the healthcare system using blockchain technology. Besides, this work also proposes multiple workflows involved in the healthcare ecosystem using blockchain technology for better data management. Different medical workflows have been designed and implemented using the ethereum blockchain platform which involves complex medical procedures like surgery and clinical trials. This also includes accessing and managing a large amount of medical data. Within the implementation of the workflows of the medical smart contract system for healthcare management, the associated cost has been estimated for this system in terms of a feasibility study which has been comprehensively presented in this paper. This work would facilitate multiple stakeholders who are involved within the medical system to deliver better healthcare services and optimize cost.
In recent years, disinformation including fake news, has became a global phenomenon due to its explosive growth, particularly on social media. The wide spread of disinformation and fake news can cause detrimental societal effects. Despite the recent progress in detecting disinformation and fake news, it is still non-trivial due to its complexity, diversity, multi-modality, and costs of fact-checking or annotation. The goal of this chapter is to pave the way for appreciating the challenges and advancements via: (1) introducing the types of information disorder on social media and examine their differences and connections; (2) describing important and emerging tasks to combat disinformation for characterization, detection and attribution; and (3) discussing a weak supervision approach to detect disinformation with limited labeled data. We then provide an overview of the chapters in this book that represent the recent advancements in three related parts: (1) user engagements in the dissemination of information disorder; (2) techniques on detecting and mitigating disinformation; and (3) trending issues such as ethics, blockchain, clickbaits, etc. We hope this book to be a convenient entry point for researchers, practitioners, and students to understand the problems and challenges, learn state-of-the-art solutions for their specific needs, and quickly identify new research problems in their domains.
Sri Aravinda Krishnan Thyagarajan, Adithya Bhat, Bernardo Magri, Daniel Tschudi · 5 authors
Although blockchains aim for immutability as their core feature, several instances have exposed the harms with perfect immutability. The permanence of illicit content inserted in Bitcoin poses a challenge to law enforcement agencies like Interpol, and millions of dollars are lost in buggy smart contracts in Ethereum. A line of research then spawned on Redactable blockchains with the aim of solving the problem of redacting illicit contents from both permissioned and permissionless blockchains. However, all the existing proposals follow the build-new-chain approach for redactions, and cannot be integrated with existing systems like Bitcoin and Ethereum. We present Reparo, a generic protocol that acts as a publicly verifiable layer on top of any blockchain to perform repairs, ranging from fixing buggy contracts to removing illicit contents from the chain. Reparo facilitates additional functionalities for blockchains while maintaining the same provable security guarantee; thus, Reparo can be integrated with existing blockchains and start performing repairs on the pre-existent data. Any system user may propose a repair and a deliberation process ensues resulting in a decision that complies with the repair policy of the chain and is publicly verifiable. Our Reparo layer can be easily tailored to different consensus requirements, does not require heavy cryptographic machinery and can, therefore, be efficiently instantiated in any permission-ed or -less setting. We demonstrate it by giving efficient instantiations of Reparo on top of Ethereum (with PoS and PoW), Bitcoin, and Cardano. Moreover, we evaluate Reparo with Ethereum mainnet and show that the cost of fixing several prominent smart contract bugs is almost negligible. For instance, the cost of repairing the prominent Parity Multisig wallet bug with Reparo is as low as 0.000000018% of the Ethers that can be retrieved after the fix.
Transgender community face serious socio-economic predicaments due to the discrepancy between their current gender expression and assigned gender identity at birth. Even though, a considerable amount work have been done to protect their basic human rights such as security, equality and social acceptance; trans people are still large victims of hate related crimes. With GDPR and other data protection laws and policies in place, now it is ever more important to protect the confidentiality of gender change information as well as to establish technical solutions that can prevent from inferring any sense of gender change from historical data. In this context, distributed ledger technologies such as blockchain present great opportunities for information integrity, security, privacy and access. However, at the same time provenance information extracted from immutable blockchain can be exploited to infer gender change. Addressing this paradox here we propose recommendations for managing gender change information in the blockchain environment in context of present sociopolitical, legislative and technical challenges associated with gender change.
Bogdan-Constantin Neagu, Ovidiu Ivanov, Gheorghe Grigoraş, Mihai Gavrilaș
A growing number of households benefit from the government subsidies to install renewable generation facilities such as PV panels, used to gain independence from the grid and provide cheap energy. In the Romanian electricity market, these prosumers can sell their generation surplus only at regulated prices, back to the grid. A way to increase the number of prosumers is to allow them to make higher profit by selling this surplus back into the local network. This would also be an advantage for the consumers, who could pay less for electricity exempt from network tariffs and benefitting from lower prices resulting from the competition between prosumers. One way of enabling this type of trade is to use peer-to-peer contracts traded in local markets, run at microgrid (μG) level. This paper presents a new trading platform based on smart peer-to-peer (P2P) contracts for prosumers energy surplus trading in a real local microgrid. Several trading scenarios are proposed, which give the possibility to perform trading based on participants’ locations, instantaneous active power demand, maximum daily energy demand and the principle of first come first served implemented in an anonymous blockchain trading ledger. The developed scheme is tested on a low-voltage (LV) microgrid model to check its feasibility of deployment in a real network. A comparative analysis between the proposed scenarios, regarding traded quatities and financial benefits is performed.
Smart Grid, an intelligent connected grid consisting of millions of smart devices, used to collect data from the grid to improve the efficiency of its operation. These smart devices communicating wirelessly are susceptible to attacks and hence the security and privacy of the smart devices along with the smart grid is a major challenge. Blockchain-based systems provide improved security and privacy and hence gained a lot of attention in the recent past. This paper proposes a blockchain-based architecture for Neighborhood Area Networks (NANs) and Home Area networks (HANs) in Smart Grid. The paper presents a security analysis in terms of confidentiality, integrity and availability to show that the proposed blockchain-based Smart Grid architecture is secure. Also, the impact of the improved security on packet delays, energy and computational overhead is discussed.
Blockchain is one of the most significant emerging technologies today.Anecdotal evidence suggested that blockchain technology will transform auditing by enabling continuous auditing.However, there is little empirical knowledge of the blockchain implications on the audit profession.The objective of this paper is to explore, through the lens of transaction costs theory, the impact of blockchain technology on the continuous auditing.A proposed research model will be tested using survey data that will be collected from audit firms.The collected data will be processed using R statistical software that is appropriate to data analytics.The expected results should indicate that auditors still need to use professional judgment and gather evidence for assertions factors that blockchain technology does not address.Furthermore, regardless of the role they might choose to fulfill, auditors must keep up to date with the technology if they are to stay in-demand in the world of blockchain.
Purpose: Purpose-This paper aims to introduce and discuss blockchain technology and its effect on the hospitality and tourism industry as well as a practical point of view to hospitality and tourism businesses. The central interest in this study is to produce a new and rigorous in-depth analysis that will provide the basis for a broad debate and perspective on potential uses of blockchain technology for hospitality and tourism research as well as the industry as a whole. Importance of the research: This study leads to knowledge development in the tourism industry by creating an extensive structure that enhances hospitality and tourism efficiency. The current study thus helps to alleviate tourism & hospitality integrated blockchain technology. Theory: A single technology adoption and use theory (UTAUT 2) is the fundamental theory for this study. Reference was made in this analysis to progress in the growth of the blockchain capability of hospitality and tourism.Methods: The current study focused on a concise methodology and quantitative analysis.QR is the simplest way to accept or deny a theory.Quantitative analysis from all of Malaysia has been obtained through a cross-sectional analysis via the sampling method. Originality: One of the latest researchto boost the efficiency of hospitality and tourism performance by blockchain. This research demonstrates how blockchain (familiarity, concern and error), trust,facilitating condition, consumer intention and blockchain adoption.
Abstract Blockchain-based applications have become increasingly popular in recent years. Security concerns are rising as blockchain users are becoming aware of how their private data is stored across this decentralized network of computing nodes. Formal verification allows developers to improve software quality and hence make it more secure. The main hypothesis of this paper is that it is achievable to perform formal verification of a model that represents a smart contract responsible for user registration. In order to test the hypothesis, we have created a model of such a smart contract and checked it against a set of formal constraints. As a result of the conducted study, a conclusion can be made that the hypothesis is correct.
Jan 1, 2020·Proceedings of the 2nd International Scientific and Practical Conference “Modern Management Trends and the Digital Economy: from Regional Development to Global Economic Growth” (MTDE 2020)
Albina Anvarovna Bilyalova, Irina Vaslavskaya, R. Gaifutdinova
Transport development trends and the digitalization of the economy pose new requirements for the level of service and the quality of freight transport, which are difficult to maintain without optimizing transport and logistics costs. To optimize the management of freight transport in modern conditions, it is necessary to use modern intelligent information technologies, methods of information and conceptual computer modeling of supply chains that will virtualize transport resources to further build an optimal development for managing this activity. The article analyzes the use of intelligent information technology Blockchain technology in the management of transport processes, which can improve the quality of transport and forwarding services. The authors describe examples of the use of Blockchain technology in the transport industry in such well-known companies as Ryder, BiTA, the Plato system, MTI (Marine Transport International (UK) Limited), Toyota. Based on the experience of using Blockchain technology, the authors identify the advantages and disadvantages of Blockchain technology in the transport industry. As a result, it was concluded that Blockchain technology will become one of the key tools of the digital society, which will not only optimize various processes, but will bring simplicity, transparency and efficiency to the transport and logistics industry.
In this competitive world, it is hard to get a job. It requires some specific qualifications and experience according to the post. If a person is not fulfilling these required entities, then not able to apply for that post. Therefore, some people, who are not eligible may use different forgery approaches like fake mark sheets, fake experience certificates, fake medical certificates, etc. However, despite being these fake certificates, some people may have a criminal background also. Therefore, large numbers of resources are required to verify the educational records, criminal background, and experience of a person. Therefore, the proposed system provides an efficient solution to these problems using blockchain technology. In the proposed work, we used three different modules like college, organisation, and police. The college is responsible for providing academic qualifications and the organisation is responsible for providing experience while police are responsible for proving and verification of the criminal record. The proposed system is implemented on the Ethereum blockchain platform and effectively can be used by the organisations for verifying the record of their employees.