【Author】 Shi, Zeshun Zhou, Huan de Laat, Cees Zhao, Zhiming

【Source】FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE

【影响因子】7.307

【主题类别】

区块链应用-实体经济-竞标拍卖

【Abstract】Industrial applications often require federated cloud services from multiple providers to improve reliability and flexibility. Traditional selection methods through auctions usually involve a centralized auctioneer to coordinate the auction procedure. Blockchain and smart contracts provide a decentralized mechanism to automate the cloud auction process; however, existing solutions fail in the selection of the most suitable providers and the violation detection of the signed auction agreements, which are also known as service-level agreements (SLAs). To tackle these problems, we propose an integrated auction model using Bayesian game theory and blockchain techniques. The proposed model is enhanced with two Bayesian Nash Equilibriums (BNEs); the first BNE enables the selection of cost-effective providers to construct the federated cloud services, while the second BNE ensures consistent and trustworthy monitoring of federated SLAs. Moreover, a timed message submission (TMS) algorithm is proposed to protect the auction privacy during the message submission phase. This paper validates the equilibrium results of two BNEs and implements the proposed model on the Ethereum blockchain. The analytical and experimental results demonstrate the feasibility, trustworthiness, and cost-effectiveness of our model. (C) 2022 The Author(s). Published by Elsevier B.V.

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【Keywords】Blockchain; Auction; Federated cloud service; Quality of service; Game theory; Trustworthy

【发表时间】2022

【收录时间】2023-01-02

【文献类型】 理论模型

【DOI】 10.1016/j.future.2022.05.017

【Author】 Setyowati, Milla Sepliana Utami, Niken Desila Saragih, Arfah Habib Hendrawan, Adang

【Source】TECHNOLOGY IN SOCIETY

【影响因子】6.879

【主题类别】

区块链应用-实体经济-税收领域

【Abstract】This study examines the strategic factors to implement blockchain technology in Indonesia's Value-Added Tax (VAT) system. Blockchain technology is a transparent technology in which each party who is a member of the chain know the data or information in the blockchain network. Therefore, blockchain technology can be used only for transparent data. The research topic is limited to the scope of VAT because there is data in Indonesia's VAT which is transparent and safe to know by other parties and public. The approach used in this study is qualitative with the aim of analyzing strategic factors for implementing blockchain in Indonesia's VAT system. Based on the objectives, this study was categorized as descriptive research. The data collection techniques used in this study included field studies, in-depth interviews, and literature review related to the topic. The results of this study indicate that the factors that need to be considered in implementing blockchain in Indonesia's VAT system are organizational factors, which consist of organizational readiness, support from parties with higher authority, technological readiness, innovation, governance, and internal regulation processes; environmental factors which consist of external government support and partner support; and technological factors which consist of benefits, data security, smart contract coding, architecture, permissions, and shared infrastructure.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】Tax system; Value-added tax; Strategic factors; Blockchain

【发表时间】2023

【收录时间】2023-01-02

【文献类型】 实证数据

【DOI】 10.1016/j.techsoc.2022.102169

【Author】 Li, Jianbin Li, Shike Cheng, Long Liu, Qingzhi Pei, Jiaming Wang, Shen

【Source】IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY

【影响因子】6.239

【主题类别】

区块链应用-实体经济-交通领域

【Abstract】Consensus-based Speed Advisory System (CSAS) is used to recommend a consensus speed to a group of vehicles for specific application purposes, such as minimizing emissions or energy consumption. To remedy data privacy concerns for speed advisory services, the latest works have investigated how to get an optimal speed in a privacy-preserving manner. However, almost all the designs are based on a centralized architecture, which could still meet service trust issues, such as that a random speed could be recommended when the central server meets cyber incursion attacks. To address the problem, in this paper we propose BSAS, a trustworthy and privacy-preserving CSAS over the blockchain. Specifically, BSAS follows a fully decentralized architecture with cryptographic primitives to guarantee service trust and data privacy. Moreover, to encourage vehicles to participate in the service computing process, a value-driven incentive mechanism is also employed. We present the detailed design and implementation of BSAS, and our emulation results show that the proposed BSAS can achieve promising system performance in terms of real-time speed recommendation in a trustworthy and privacy-preserving way.

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【Keywords】Speed advisory systems; blockchain; trust servi-ces; data privacy; optimal consensus algorithm

【发表时间】2022

【收录时间】2023-01-02

【文献类型】 理论模型

【DOI】 10.1109/TVT.2022.3189410

【Author】 Mo, Mingsen Ji, Shan Wang, Xiaowan Mohiuddin, Ghulam Ren, Yongjun

【Source】CMC-COMPUTERS MATERIALS & CONTINUA

【影响因子】3.860

【主题类别】

区块链应用-实体经济-医疗领域

【Abstract】Due to the extensive use of various intelligent terminals and the popularity of network social tools, a large amount of data in the field of medical emerged. How to manage these massive data safely and reliably has become an important challenge for the medical network community. This paper proposes a data management framework of medical network community based on Consortium Blockchain (CB) and Federated learning (FL), which realizes the data security sharing between medical institutions and research institutions. Under this framework, the data security sharing mechanism of medical network community based on smart contract and the data privacy protection mechanism based on FL and alliance chain are designed to ensure the security of data and the privacy of important data in medical network community, respectively. An intelligent contract system based on Keyed-Homomorphic Public Key (KH-PKE) Encryption scheme is designed, so that medical data can be saved in the CB in the form of ciphertext, and the automatic sharing of data is realized. Zero knowledge mechanism is used to ensure the correctness of shared data. Moreover, the zero-knowledge mechanism introduces the dynamic group signature mecha-nism of chosen ciphertext attack (CCA) anonymity, which makes the scheme more efficient in computing and communication cost. In the end of this paper, the performance of the scheme is analyzed from both asymptotic and practical aspects. Through experimental comparative analysis, the scheme proposed in this paper is more effective and feasible.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】Data management; blockchain; federated learning

【发表时间】2023

【收录时间】2023-01-02

【文献类型】 实验仿真

【DOI】 10.32604/cmc.2023.028843

【Author】 Akhter, A. F. M. Suaib Arnob, Tawsif Zaman Noor, Ekra Binta Hizal, Selman Pathan, Al-Sakib Khan

【Source】ENTROPY

【影响因子】2.738

【主题类别】

区块链应用-实体经济-电力领域

【Abstract】The popularity of electric vehicles (EVs) is constantly increasing, as they use relatively greener, sustainable energy. However, it is a fact that the charging stations for EVs are yet to meet the demand. It could be a great solution if a peer-to-peer (P2P) charging system could be initiated by anyone who wants to make their garage's charge points publicly available for commercial purposes, named a home charging station (HCS). In this work, our idea is to bring interested charging stations under a network of nodes and a blockchain-based management system, where the blockchain is responsible for ensuring the authenticity of both the charging stations and charge receiver. A cryptocurrency-based payment system has also been proposed to ensure transactions' security, integrity, transparency, and immutability. A reputation management system is applied to maintain the quality of service. Miners with high processing power are used to alleviate lagging during block creation, supported by edge servers. The proposed system has been implemented by using virtual machines. A theoretical analysis is presented to assess the compatibility and possible cost requirements to implement the system in a real-world scenario.

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【Keywords】blockchain; cryptocurrency; edge computing; electric vehicles; Ethereum; P2P charging

【发表时间】2022

【收录时间】2023-01-02

【文献类型】 理论模型

【DOI】 10.3390/e24111644

【Author】 Bae, Geumil Kim, Jang Ho

【Source】ENTROPY

【影响因子】2.738

【主题类别】

区块链治理-市场治理-数字货币

【Abstract】The cryptocurrency market is understood as being more volatile than traditional asset classes. Therefore, modeling the volatility of cryptocurrencies is important for making investment decisions. However, large swings in the market might be normal for cryptocurrencies due to their inherent volatility. Deviations, along with correlations of asset returns, must be considered for measuring the degree of market anomaly. This paper demonstrates the use of robust Mahalanobis distances based on shrinkage estimators and minimum covariance determinant for observing anomaly scores of cryptocurrencies. Our analysis shows that anomaly scores are a critical complement to volatility measures for understanding the cryptocurrency market. The use of anomaly scores is further demonstrated through portfolio optimization and scenario analysis.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】cryptocurrency; anomaly score; Mahalanobis distance; minimum covariance determinant; shrinkage estimators

【发表时间】2022

【收录时间】2023-01-02

【文献类型】 理论模型

【DOI】 10.3390/e24111643

【Author】 Cossu, Alberto

【Source】EUROPEAN JOURNAL OF CULTURAL STUDIES

【影响因子】2.099

【主题类别】

区块链治理-市场治理-数字货币

【Abstract】This Cultural Commons article provide some coordinates that help explain why cryptocurrencies have recently become mainstream, indicating their connection to precarisation and new class formations. It considers how this change has been achieved by examining the impact of ICTs (information and communications technologies) on the process of socialisation and re-signification of finance. Finally, it explores how these shifts might be related to the emergence of a peculiar form of digital and cultural commons. It grants that this last idea might appear odd, far-fetched, or downright inappropriate, since investment by individuals for individual profit is a defining characteristic of the realm of crypto-finance. It hopes to show, however, that what lies behind these individualised actions is an ambivalence in which exploitation coexists with a redefinition of the genetic code of finance, giving rise to a shared culture and a commoning of resources.

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【Keywords】Cryptocurrency; pandemic; bitcoin; sociology; commons

【发表时间】

【收录时间】2023-01-02

【文献类型】 观点阐述

【DOI】 10.1177/13675494221135660

【Author】 Habib, Gousia Sharma, Sparsh Ibrahim, Sara Ahmad, Imtiaz Qureshi, Shaima Ishfaq, Malik

【Source】FUTURE INTERNET

【影响因子】0.000

【主题类别】

区块链技术-协同技术-云计算

【Abstract】The real-world use cases of blockchain technology, such as faster cross-border payments, identity management, smart contracts, cryptocurrencies, and supply chain-blockchain technology are here to stay and have become the next innovation, just like the Internet. There have been attempts to formulate digital money, but they have not been successful due to security and trust issues. However, blockchain needs no central authority, and its operations are controlled by the people who use it. Furthermore, it cannot be altered or forged, resulting in massive market hype and demand. Blockchain has moved past cryptocurrency and discovered implementations in other real-life applications; this is where we can expect blockchain technology to be simplified and not remain a complex concept. Blockchain technology's desirable characteristics are decentralization, integrity, immutability, verification, fault tolerance, anonymity, audibility, and transparency. We first conduct a thorough analysis of blockchain technology in this paper, paying particular attention to its evolution, applications and benefits, the specifics of cryptography in terms of public key cryptography, and the challenges of blockchain in distributed transaction ledgers, as well as the extensive list of blockchain applications in the financial transaction system. This paper presents a detailed review of blockchain technology, the critical challenges faced, and its applications in different fields. Blockchain in the transaction system is explained in detail with a summary of different cryptocurrencies. Some of the suggested solutions are given in the overall study of the paper.

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【Keywords】blockchain; cloud computing; cryptocurrency; Bitcoin

【发表时间】2022

【收录时间】2023-01-02

【文献类型】 观点阐述

【DOI】 10.3390/fi14110341

【Author】 Almeida, Dora Dionisio, Andreia Vieira, Isabel Ferreira, Paulo

【Source】JOURNAL OF RISK AND FINANCIAL MANAGEMENT

【影响因子】0.000

【主题类别】

区块链治理-市场治理-数字货币

【Abstract】Cryptocurrency investments are often perceived as uncertain and risky. In this study, we assessed if this is indeed the case, using a sample of seven cryptocurrencies and considered a period that encompassed the first real global shock in the life of these relatively new financial assets, the COVID-19 pandemic. Uncertainty was evaluated using Shannon's symbolic entropy. To measure risk, we use value-at-risk and conditional value-at-risk. The results indicate that, except for Tether, the analyzed cryptocurrencies' returns exhibited similar patterns of uncertainty and risk. Levels of uncertainty were close to the maximum values, but high uncertainty is not always associated with high risk. During the pandemic crisis, uncertainty increased while risk decreased, suggesting that the considered assets may have safe haven properties.

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【Keywords】risk; uncertainty; cryptocurrencies; symbolic entropy; value-at-risk; conditional value-at-risk

【发表时间】2022

【收录时间】2023-01-02

【文献类型】 实证数据

【DOI】 10.3390/jrfm15110532

【Author】 Sayim, Mustafa My, Nguyen Quang

【Source】ANNALS OF FINANCIAL ECONOMICS

【影响因子】0.000

【主题类别】

区块链治理-市场治理-数字货币

【Abstract】In this research, the U.S. investor sentiment effect on cryptocurrency returns and volatility is examined by separating it into irrational and rational parts. According to the data, an unforeseen rise in the rational part of U.S. individual investor attitude influences cryptocurrency returns statistically and positively. In other words, rational sentiment can result in rising cryptocurrency returns. Additionally, a positive significant association exists between cryptocurrency volatility and the rational part of the individual U.S. investor sentiment. The findings confirm the hypothesis that the behavior of rational investors who utilize and study the impact of economic factors on asset prices reduces cryptocurrency volatility.

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【Keywords】Cryptocurrency; investor sentiment; VAR model

【发表时间】

【收录时间】2023-01-02

【文献类型】 实证数据

【DOI】 10.1142/S2010495222420015