【Author】 Chowdhury, Md Shahedur R. Damianov, Damian S.

【Source】INTERNATIONAL REVIEW OF FINANCIAL ANALYSIS

【影响因子】8.235

【主题类别】

区块链治理-市场治理-数字货币

【Abstract】In this paper, we examine whether newly developed crypto price and policy uncertainty indices based on news coverage (Lucey et al., 2022) are associated with the emergence of bubbles in cryptocurrencies. Using probit regressions, we show that these indices have a higher explanatory power than factors previously considered in the literature. Furthermore, using a random forest model, we show that these classifiers are associated with the largest information gain (reduction in the Gini impurity measure) of the model. While the COVID-19 pandemic has exacerbated the occurrence of bubbles, these crypto uncertainty indices remain the best predictors of bubbles both before and during the pandemic. These results are robust to alternative definitions of a bubble, variations in the time horizon, and the inclusion of various regressors known to be related to the price movements in crypto assets.

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【Keywords】Cryptocurrencies; Bubbles; UCRY Price; UCRY policy; Uncertainty; COVID-19

【发表时间】2024

【收录时间】2023-11-10

【文献类型】 理论模型

【DOI】 10.1016/j.irfa.2023.102949

【Author】 Tomar, Ashish Tripathi, Sachin

【Source】COMPUTER COMMUNICATIONS CCF-C

【影响因子】5.047

【主题类别】

区块链应用-实体经济-医疗领域

【Abstract】The integration of fog computing and blockchain in the Internet of Medical Things (IoMT) domain has wholly transformed the healthcare industry and e-health services. In IoMT, the patient's personal health data is shared on an open channel that makes the IoMT system an easy target for attackers. Therefore, confidentiality and authentication are the key security requirements for an IoMT system. Although few works have been proposed to provide secure communication in conventional healthcare infrastructures, limited work has been done to achieve data confidentiality and authentication in blockchain-based IoMT under fog environment. Therefore, this work proposes a blockchain-assisted certificateless aggregate signcryption called BCSoM scheme that achieves data confidentiality and device/patient authentication. In the proposed work, first, IoMT devices generate a signcrypted text and transmit it to an aggregator that generates an aggregated signcrypted text and sends it to a receiver fog server. The receiver fog server verifies the signcrypted text through the blockchain and also performs unsigncryption to retrieve the original message. The proposed scheme is proven secure under the Discrete Logarithm (DL) and Computational Diffe-Hellman (CDH) assumptions. Finally, a thorough performance analysis using the Hyperledger Fabric platform and cryptographic libraries shows that the proposed scheme is computationally more efficient when compared to existing works.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】Signcryption; Blockchain; Fog computing; Healthcare; Authentication

【发表时间】2023

【收录时间】2023-11-10

【文献类型】 实验仿真

【DOI】 10.1016/j.comcom.2023.09.027

【Author】 Ali, Jehad Shan, Gaoyang Gul, Noor Roh, Byeong-hee

【Source】JOURNAL OF GRID COMPUTING CCF-C

【影响因子】4.674

【主题类别】

区块链技术-协同技术-物联网

【Abstract】The frequency of link failures in Internet-of-Things (IoT) network are more than the node failures. Hence, effective link recovery schemes are required for a seamless communication in the IoT. In contrast to traditional networking, the IoT is configured through software-defined networking premise due to its intelligent programmable controller, and orchestration features. SD-IoT with edge computing can help organizations to create a highly flexible and agile IT infrastructure that can adapt quickly to changing business requirements. By automating network operations, optimizing network performance, and improving application availability, SD-IoT can help to improve the efficiency and effectiveness of edge computing environments. Moreover, the security is also a prime issue in the IoT, and DDos attacks are typical threats concerning security in IoT. To combat with these challenges, in this paper we propose a reactive recovery strategy for link failures by proposing a TOPSIS module employing multi-objective-decision making in the intelligent SDN controller, which selects the alternative path for the failed link on the end-to-end (E2E) path in a SD-IoT considering multiple criteria instead of the shortest path only as proposed by the conventional methods for failed link recovery. Moreover, DDoS attacks detection as well as mitigation mechanism based on blockchain in SD-IoT with machine learning is proposed. The blockchain guarantee the security for IoT system. The results demonstrated and validated in Mininet with real SDN controller as well as proof-of-concept experiments in real topologies for IoT shows the effectiveness of the proposed method. Our proposed strategy surpass the traditional schemes in terms of network throughput, recovery delay, and packet delivery ratio.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】Software-defined networking; Intelligent networking; Blockchain; ANN; multi-criteria-decision-making; fault tolerance; edge computing; IoT network; PCA

【发表时间】2023

【收录时间】2023-11-10

【文献类型】 实验仿真

【DOI】 10.1007/s10723-023-09693-8

【Author】 Mosna, Anna Soana, Giulio

【Source】COMPUTER LAW & SECURITY REVIEW

【影响因子】2.707

【主题类别】

区块链应用-虚拟经济-NFT

【Abstract】While much has been said regarding the anti-money laundering treatment of crypto-assets, NFTs seem to have remained on the sidelines of such a debate. Collectible NFTs, however, present a distinct AML risk. Eminently, they mix the risk-factor connected with cryptoassets and fine art. As the first, they are global, pseudonymous, and immaterial. As the second, they have a highly subjective price. In the absence of clear regulation, the risk is for this market to become a criminal haven. The present contribution analyses the relation between collectible NFTs and AML regulation. We pursue our analysis with a view at analyzing the compatibility of NFTs with their two connected categories: crypto-assets and fine art. (c) 2023 Anna Mosna and Giulio Soana. Published by Elsevier Ltd. All rights reserved.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】Non-fungible tokens; NFT; Anti-money laundering; AML; Crypto-assets; Works of art; Art market

【发表时间】2023

【收录时间】2023-11-10

【文献类型】 观点阐述

【DOI】 10.1016/j.clsr.2023.105874

【Author】 Si, Xueming Li, Min Yao, Zhongyuan Zhu, Weihua Liu, Jianmei Zhang, Qian

【Source】ELECTRONICS

【影响因子】2.690

【主题类别】

区块链技术-核心技术-共识机制

【Abstract】Conventional blockchain consensus protocols tailored for the Internet of Vehicles (IoV) usually face low transaction throughput, high latency, and elevated communication overhead issues. To address these issues, in this paper, we propose ESBCP, an efficient and secure blockchain consensus protocol for the IoV environment. Firstly, considering the significant performance differences among nodes in the IoV, we designed a blockchain consensus model for the IoV. Roadside units execute a trust evaluation mechanism to select high-quality vehicle nodes for the consensus process, thereby reducing the likelihood of malicious nodes in the consensus cluster. Secondly, we designed a node partition strategy to adapt to the dynamic feature of the IoV. Finally, addressing the mobility of nodes in the IoV, we introduced a dynamic unique node list. Vehicle nodes can promptly select nodes with high reliability from the list of communicable nodes to join their unique node list, while also promptly removing nodes with low reliability from their unique node list. Combining these strategies, we propose DK-PBFT, an improved Practical Byzantine Fault Tolerance consensus algorithm. The algorithm meets the efficiency and mobility requirements of vehicular networks. Through theoretical analysis, ESBCP could prevent external and internal security risks while reducing communication overhead. Experimental verification demonstrated that ESBCP effectively reduces consensus latency and improves transaction throughput. Our proposed ESBCP can be used in other application scenarios that require high consensus efficiency.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】blockchain; consensus protocols; IoV; trust evaluation mechanism; node partition strategy; dynamic unique node list

【发表时间】2023

【收录时间】2023-11-10

【文献类型】 实验仿真

【DOI】 10.3390/electronics12204285

【Author】 Hua, Caijian Wu, Sichao Zhang, Yan Luo, Kun Li, Miaomiao Fu, Jiaguo

【Source】ELECTRONICS

【影响因子】2.690

【主题类别】

区块链应用-实体经济-产权领域

【Abstract】Currently, there are several issues in China's rural property rights trading, including poor credit reporting, low transaction efficiency, non-standardized transaction contracts, and high costs for rights protection. However, blockchain technology, known for its convenience, security, and traceability, is highly compatible with the requirements of standardization, convenience, and agility in rural property rights trading. Therefore, we propose a system framework for rural property rights trading based on the Hyperledger Fabric consortium blockchain. This framework significantly enhances transaction efficiency, improves the security of rural property rights trading, effectively resolves contract disputes in property rights transactions, and promotes rural revitalization and development. Furthermore, we design the information data structure on the blockchain, present the information flow, and develop smart contracts that utilize automation capabilities to automatically summarize, analyze, and issue alerts based on on-chain data, enabling risk assessment for both buyers and sellers. Additionally, we introduce an improved PBFT consensus algorithm called CA-PBFT, which is based on the PBFT consensus protocol and integrates a scoring model and simplified consensus protocol. CA-PBFT efficiently reduces transaction response latency and improves information throughput. Finally, we develop a prototype system for rural property rights trading and perform a performance comparison and analysis of CA-PBFT against other PBFT-based consensus algorithms in this prototype system. Experimental results demonstrate the feasibility of the prototype system framework for rural property rights trading.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】rural property rights transaction; blockchain; HyperLedger fabric; CA-PBFT

【发表时间】2023

【收录时间】2023-11-10

【文献类型】 实验仿真

【DOI】 10.3390/electronics12204334

【Author】 Deavours, Danielle

【Source】GAMES AND CULTURE

【影响因子】2.180

【主题类别】

区块链应用-虚拟经济-元宇宙

【Abstract】More attention is being brought to the identity challenges minority gamers face. However, as the gaming industry moves into virtual spaces and virtual reality (VR) gaming continues to grow in popularity, it is important to understand how identity and the virtual metaverse combine. Using a carnal autoethnography of a competitive woman VR gamer's lived experiences with sexism and misogyny over 6 months, this study explores how many women experience VR games as outsiders in a male-dominated space. Through the application of ambivalent sexism theory, this study shows virtual platform affordances can both help and harm minority gamers in their quest to be accepted in gaming communities. This study is among the first to examine gendered experience of VR gaming, especially from an autoethnographic frame, contributing to existing literature in women and gaming. This work calls on players, developers, educators, and research to emphasize allyship and media literacy to encourage more diverse virtual spaces.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】virtual reality; ambivalent sexism; misogyny; gaming; gender; diversification

【发表时间】2023

【收录时间】2023-11-10

【文献类型】 实证数据

【DOI】 10.1177/15554120231208406

【Author】 Omri, Imen Ozcelebi, Oguzhan

【Source】SINGAPORE ECONOMIC REVIEW

【影响因子】1.736

【主题类别】

区块链治理-市场治理-数字货币

【Abstract】In this paper, we use quantile-based analysis and nonlinear conditional autoregressive value-at-risk (CAViaR) model to investigate how cryptocurrency price and policy uncertainty indexes affect exchange traded funds (ETFs) investing in equity securities of companies operating in various disruptive innovation sectors and related to digital assets and blockchain technology. Results of the quantile-on-quantile (QQ) estimates and quantile regression reveal that cryptocurrency price and policy uncertainty generally have a negative impact on the globally traded ETFs suggesting that the changes in cryptocurrency uncertainty lead to destabilizing effects in the ETF market. Moreover, we find that the impact of cryptocurrency uncertainty is asymmetric depending on each quantile of ETF returns even though each ETF is influenced in the same way by each uncertainty index, indicating that cryptocurrency price uncertainty and cryptocurrency policy uncertainty have common effects on the ETF market. A linear quantile causality analysis indicated that there is evidence of a significant causality running from the considered uncertainty indexes to the ETF returns, revealing that cryptocurrency price and policy uncertainty have a significant information value in explaining expected ETF returns. On the other hand, we find that linear quantile models outperform nonlinear CAViaR models in quantiles that are only moderate.

你可以尝试使用大模型来生成摘要 立即生成

【Keywords】ETF; cryptocurrency uncertainty; digital assets; quantile regression; co-movement

【发表时间】2023

【收录时间】2023-11-10

【文献类型】 实证数据

【DOI】 10.1142/S0217590823500509