【Author】 Hong, Runyu Fenyo, David
【影响因子】16.988
【主题类别】
区块链应用-实体经济-医疗领域
【Abstract】A recent study by Saldanha et al. demonstrates that blockchain-based models outcompeted local models and performed similarly with merged models to predict molecular features from cancer histopathology images. The results reveal the capability of decentralized models in molecular diagnosis of cancer.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【Author】 Zhang, Chuanhai Chen, Haicui Peng, Zhe
【影响因子】9.848
【主题类别】
区块链治理-市场治理-市场分析
【Abstract】This paper investigates how Bitcoin futures introduction affects Bitcoin's normal and jump volatility over time. Using GARCH-jump models, we find Bitcoin's normal and jump volatility increase in the short run, move in opposing directions in the mid run, and decrease in the long run. Besides, we examine whether futures trading activity, proxied by unexpected trading volume and open interest, is associated with Bitcoin volatility. We document that Bitcoin's normal and jump volatility covary positively with unexpected trading volume in the short and mid run. Meanwhile, both volatility covary positively (negatively) with unexpected open interest in the short (mid) run.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Bitcoin; Bitcoin futures; Futures trading activity; Jump risk; GARCH-jump models
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 实证数据
【Author】 Vidal-Tomas, David
【影响因子】9.848
【主题类别】
区块链应用-虚拟经济-NFT
【Abstract】The combination of blockchain technologies and the gaming industry has given rise to metaverses and play-to-earn games, which incorporate their own economy, commerce, and currencies, namely, metaverse and play-to-earn tokens. In this study, we analysed the performance and dynamics of 174 tokens, showing that this new crypto niche is characterised by (i) a positive performance in the long run, (ii) the absence of high co-movements with the cryptocurrency market, (iii) the emergence of bubbles, (iv) and the absence of high correlations with NFT features, such as number of transactions, sales and Google searches.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Metaverse; Play-to-earn; NFT; Cryptocurrency; COVID-19; Diversification
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 实证数据
【Author】 Nguyen, Thach V. H. Thai Vu Hong Nguyen Thanh Cong Nguyen Thu Thi Anh Pham Nguyen, Quan M. P.
【影响因子】9.848
【主题类别】
区块链治理-市场治理-市场分析
【Abstract】This study investigates the impacts of the United States (US) federal funds rate and Chinese interbank rate on the behaviors of stablecoins and traditional cryptocurrencies. We employ GARCH, EGARCH and Fixed Effects models for the daily sample of the top five stablecoins and the top five traditional cryptocurrencies in terms of market capitalization from December 2018 to December 2019. Our results show that a higher federal funds rate and Chinese interbank rate compress the prices and price volatility of stablecoins. In contrast, higher rates from both countries increase the prices and price volatility of traditional cryptocurrencies. Both rates also increase the trading value of both types of coins. The federal funds rate tends to have stronger impacts compared to the Chinese interbank rate on both types of coins, except for the price response of traditional cryptocurrencies.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Stablecoins; Cryptocurrencies; Federal funds rate; Chinese interbank rate
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 实证数据
【影响因子】9.848
【主题类别】
区块链治理-市场治理-市场分析
【Abstract】This paper examines the dynamic connectedness of return-and volatility spillovers among cryptocurrency index (CRIX), Gold, and uncertainty measures. Apart from traditional uncertainty measures, we also consider two novel uncertainty measures: Cryptocurrency Policy Uncertainty and Cryptocurrency Price Uncertainty indices. We observe that cryptocurrency policy uncertainty is the main transmitter of the return spillovers to other variables. In addition, Gold is a net receiver of both the return and the volatility spillovers. These results are valid under bearish, bullish, and normal market conditions. Our findings contribute to the literature considering the spillover effect between cryptocurrencies and other assets and their determinants.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Dynamic connectedness; Cryptocurrency; Policy uncertainty; Price uncertainty; Gold
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 实证数据
【Author】 Demir, Ender Ersan, Oguz Popesko, Boris
【影响因子】9.848
【主题类别】
区块链治理-市场治理-数字货币
【Abstract】Fan tokens, digital assets providing privileges including rewards and promotions as well as voting rights in polls, recently became highly popular among the football clubs and the (fan) investors. Fan tokens differ from the stocks of football clubs with respect to ownership properties. Fan tokens might be associated with investor mood changes and reaction to match results. This paper aims to explore the impact of football match results on token prices of the clubs. We show that both the losses and wins in the most prestigious European tournament, UEFA Champions League affect the fan token abnormal returns, losses with an effect of a larger magnitude. Domestic matches and Europa League matches are not followed by similar reactions from the investors. Our results are robust to the use of alternative model specifications and various benchmark assets.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Fan tokens; cryptocurrencies; football clubs; asset prices; mood
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 实证数据
【Author】 Ahn, Yongkil
【影响因子】9.848
【主题类别】
区块链治理-市场治理-市场分析
【Abstract】This paper investigates extreme tail dependence between cryptocurrencies and the S&P 500 index using a model-free approach. It appears that any symmetric model fails to explain the correlation structure in major cryptocurrency returns. Moreover, the sample downward tail correlations between cryptocurrencies and the equity market are much greater than the upward tail ones. The disadvantages of cryptocurrencies as an asset class might be more lively because cryptocurrencies entail high asymmetric tail dependence, especially when the equity market is going down.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Extreme tail dependence; Cryptocurrency; Asymmetric correlation
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【影响因子】8.839
【主题类别】
区块链应用-实体经济-公共管理
区块链技术-平台项目-Ethereum
【Abstract】Bangladesh is a small country with a large population. Its increasingly developing economy further makes land a lucrative source of fixed capital. On the other hand, land titling is a cumbersome and lengthy process, where different government bodies process different sets of documents, and bureaucratic loopholes encourage fraudulent activities by organized people. As a result, the current model suffers from good governance. In this paper, we propose a Blockchain-based solution that offers data synchronization and transparency, ease of access, immutable records management, a faster and cheaper solution. Considering the technological knowledge and capacity of the people and the government, we introduced a phase by phase Blockchain adoption model that starts with a public Blockchain ledger and later gradually incorporates two levels of Hybrid Blockchain. We provide detailed smart contracts design of the public Blockchain and implement a prototype system using Ethereum. Our experimental setup uses local and live Ethereum test networks to demonstrate the efficacy of the proposed system. Our analysis shows that the proposed model reduces the number of required travels, the overall cost of information processing as well as provide easy access to vital information. As a result, Blockchain adoption can improve the land title digitization effort of Bangladesh. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of King Saud University.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Bangladesh; Land title management; Transparent governance; Hybrid Blockchain; Smart contract; Ethereum
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【Author】 Tchakounte, Franklin Calvin, Koudanbe Amadou Ari, Ado Adamou Abba Mbogne, David Jaures Fotsa
【影响因子】8.839
【主题类别】
区块链技术-核心技术-智能合约
【Abstract】One of the main concerns of cybersecurity is the detection of hoaxes across social media. Hoaxers propagate such messages to mislead users and to promote violence. Several approaches exist in literature to address this issue. They are mainly limited to detect hoax activities by characterizing the message nature and detecting provenance of messages. However, unless hoaxes are detected, they continue to propagate across social media nodes. This work aims at reducing the dissemination of hoaxes across group of users. Relying on social graph structure, this research develops a mechanism based on smart contract logics to prevent a group to consume a fake post. To achieve this objective, we used a smart contract to exploit a trust index computed based on message characteristics and group features such as graph density, group status, group degree, group acceptability. Based on the value of trust index, the message is forwarded or blocked. Experiments realized on groups of different characteristics revealed that the proposed smart contract is even able to reactively block a fake post of the same nature than the group type. Results indicate that the proportion of targeted groups could be reduced even if their interests match with the message subject. This research is an important step forward to anti-promote hoaxes with the novelty of exploiting smart contract approach to contain their propagation. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of King Saud University.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Block; Dissemination; Hoax; Reduce; Social graph; Smart contract; Trust index; Privacy
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【Author】 Al-Naji, Fatimah Hussain Zagrouba, Rachid
【影响因子】8.839
【主题类别】
区块链技术-协同技术-物联网
【Abstract】Raising incidents of security threats among active sessions is an increasing concern in IoT environment. Continuous authentication was introducing to be superior to traditional authentication schemes by constantly verify users' identities on an ongoing basis and spot the moment at which an illicit attacker seizes control of the session. However, several challenges remain unsolved. This research aims to investigate the power of Blockchain technology to provide real-time and non-intrusive continuous authentication for the IoT environment. Accordingly, a distributed and scalable continuous authentication solution based on Blockchain technology called CAB-IoT was proposed. It enabled fog nodes layer that tackles the limitations of IoT resources by providing localized processing of heavy continuous authentication-related tasks for a group of IoT devices. Besides, CAB-IoT introduced a trust module that depends on the face recognition machine learning model to detect outliers and abnormal access. Moreover, mutual authentication between end-users and fog nodes is also designed, as well as secure communication between the authenticated nodes. The results demonstrate a lightweight continuous authentication solution that achieved the desired balance between security and performance requirements where it was observed in a real-world environment for truly performance results. Security analysis and attack analysis are also considered during the evaluation. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of King Saud University.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Blockchain; Continuous authentication; Face recognition; Internet of things; Machine learning
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【Author】 Harwick, Cameron Caton, James
【影响因子】4.324
【主题类别】
区块链治理-市场治理-市场分析
【Abstract】Despite the past decade's rapid innovation in adapting blockchain technology to new uses, financial intermediation remains elusive except in basic and highly collateralized forms. We introduce the concept of the technical frontier to delimit the kinds of interactions that can feasibly be structured algorithmically among pseudonymous agents, as on a blockchain, and show that lending and financial intermediation unlike monetary exchange - lie outside it, even in simple forms. The path forward for truly blockchain-native financial applications, therefore, must involve the integration of real-world identity information in order to disincentivize defection. We discuss several potential technologies for doing so, and conclude that such integration is possible without compromising pseudonymity, provided real-world identity is available in the breach. (C) 2020 Board of Trustees of the University of Illinois. Published by Elsevier Inc. All rights reserved.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Cryptocurrency; Blockchain; Game theory; Financial intermediation
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 观点阐述
【影响因子】4.324
【主题类别】
区块链治理-市场治理-市场分析
【Abstract】We extend existing studies by considering the higher-order moments relationships among crude oil, gold, and Bitcoin markets. Using high-frequency data from December 2, 2014 to June 10, 2018, we analyze spillovers in jumps and realized second, third, and fourth moments among crude oil, gold, and Bitcoin markets via Granger causality and generalized impulse response analyses. Results suggest evidence of predictability and emphasize, among others, the need of jointly modeling linkages across those three markets with higher-order moments; otherwise, inaccurate risk assessment and investment inferences may arise. The responses of realized volatility shocks are generally positive. Further analyses indicate evidence of a weaker relationship between gold and crude oil and Bitcoin and crude oil compared to the relationship between Bitcoin and gold. Practical implications are also discussed. (C) 2020 Board of Trustees of the University of Illinois. Published by Elsevier Inc. All rights reserved.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】crude oil; gold; Bitcoin; realized moments; spillover effect
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【影响因子】3.476
【主题类别】
区块链应用-实体经济-数字化转型
【Abstract】Digital transformation is an inevitable trend that impacts all industries, and blockchain is one technology that drives it along with other emerging technologies. This paper conducts a systematic literature review (SLR) on how blockchain enables digital transformation. We analyzed 41 articles to identify the current state, clarify research gaps, and highlight future research agendas. The results reveal that blockchain is a promising technology that has great potential and can offer several opportunities for various companies. Collected articles contain evidence regarding challenges and barriers, as well as potential benefits of blockchain in relation to digital transformation. We also classified the research domains where blockchain is mostly mentioned into 3 big groups. Through the detailed assessment of the chosen studies, a theoretical framework for blockchain enabled digital transformation has been developed. Finally, we highlight open issues that can be handled in future research to overcome barriers and address the challenges concerning blockchain adoption.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Blockchains; Digital transformation; Bibliographies; Systematics; Companies; Technological innovation; Supply chains; Blockchain; digital transformation; systematic literature review
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 综述
【Author】 Bae, Ye Seul Park, Yujin Lee, Seung Min Seo, Hee Hwa Lee, Hyeonji Ko, Taehoon Lee, Eunsol Park, Sang Min Yoon, Hyung-Jin
【影响因子】3.476
【主题类别】
区块链应用-实体经济-医疗领域
【Abstract】Health information exchange can improve health outcomes and reduce unnecessary medical expenses. An important task in health information exchange is to prove data integrity and strengthen the right to self-determination of individuals. This can be addressed using blockchain technology and dynamic consents. We aimed to develop a blockchain-based mobile platform called HealthPocket to exchange reliable health information with proven integrity through a dynamic consent system based on the HL7 FHIR standards. Through HealthPocket, subjects can selectively provide their consent to share specific medical and PGHD through proper authorization, and each response is converted into the JSON format with FHIR compatibility. We conducted a usability test to demonstrate health information exchange between primary and tertiary medical institutions. A total of 116 subjects used the HealthPocket mobile application to selectively share health information for at least one month, and conducted a questionnaire about their experience. In addition, medical staff of the institution could access the medical information shared by the participants and use it for treatment. The user surveys for patients examined the perceived usefulness, perceived ease of use, and overall service satisfaction. The mean overall satisfaction with the health information exchange service was the highest (4.67 out of 5 points). As security, personal information protection, and interoperability are main concerns related to health information exchange, blockchain technology can provide suitable solutions. For instance, when health information is exchanged using blockchain technology, it is impossible to alter data blocks. Therefore, by using a blockchain-based platform and dynamic consent system, we ensured the integrity of medical data.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】Blockchains; Information exchange; Medical services; Medical diagnostic imaging; Hospitals; Interoperability; Usability; Blockchain; dynamic consent; fast healthcare interoperability resources; health information exchange; mobile application; personal health record
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【Author】 Lin, Xiuli
CCF-C
【影响因子】2.146
【主题类别】
区块链应用-实体经济-农牧领域
【Abstract】For traditional agricultural product traceability system, there are some problems, such as information asymmetry and serious centralized storage. To solve the problems, a set of an agricultural product traceability information analysis system based on blockchain is designed. The overall framework of the agricultural product information traceability system is built, and the traceability model and process are designed in detail from the data layer, consensus layer, and contract layer. Collaborative verification function modules are added in the data layer to ensure the authenticity of data on the blockchain. The integral penalty mechanism is introduced to improve the practical Byzantine fault tolerance algorithm (PBFT), which ensures the security of the block network and the validity of data. Smart contracts are adopted to ensure that changes in agricultural information are actually recorded on blockchain. The results show that the designed blockchain-based agricultural product information traceability system solves the problem of difficult sharing and traceability of agricultural product information, which realizes the traceability of agricultural product production information, processing information, transportation information, and transaction query information, and has certain theoretical and practical value for the information traceability of agricultural products and other products.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【DOI】 10.1155/2022/1935233
【Author】 Truong, Hien Hernandez-Ramos, Jose L. Martinez, Juan A. Bernal Bernabe, Jorge Li, Wenting Marin Frutos, Agustin Skarmeta, Antonio
CCF-C
【影响因子】1.968
【主题类别】
区块链技术-协同技术-物联网
【Abstract】The increase in the interconnection of physical devices and the emergence of the 5G paradigm foster the generation and distribution of massive amounts of data. The complexity associated with the management of these data requires a suitable access control approach that empowers citizens to control how their data are shared, so potential privacy issues can be mitigated. While well-known access control models are widely used in web and cloud scenarios, the IoT ecosystem needs to address the requirements of lightness, decentralization, and scalability to control the access to data generated by a huge number of heterogeneous devices. This work proposes CapBlock, a design that integrates a capability-based access control model and blockchain technology for a fully distributed evaluation of authorization policies and generation of access credentials using smart contracts. CapBlock is intended to manage the access to information in federated IoT environments where data need to be managed through access control policies defined by different data providers. The feasibility of CapBlock has been successfully evaluated in the scope of the EU research project IoTCrawler, which aims at building a secure search engine for IoT data in large-scale scenarios.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 理论模型
【DOI】 10.1155/2022/1828747
CCF-C
【影响因子】1.968
【主题类别】
区块链应用-实体经济-电商领域
【Abstract】Online advertising, which depends on consumers' click, creates revenue for media sites, publishers, and advertisers. However, click fraud by criminals, i.e., the ad is clicked either by malicious machines or hiring people, threatens this advertising system. To solve the problem, many schemes are proposed which are mainly based on machine learning or statistical analysis. Although these schemes mitigate the problem of click fraud, several problems still exist. For example, some fraudulent clicks are still in the wild since their schemes only discover the fraudulent clicks with a probability approaching but not 100%. Also, the process of detecting a click fraud is executed by a single publisher, which makes a chance for the publisher to obtain illegal income by deceiving advertisers and media sites. Besides, the identity privacy of consumers is also exposed because the schemes deal with the plain text of consumers' real identity. Therefore, in this paper, a blockchain-based click fraud detection and prevention scheme (BCFDPS) for online advertising is proposed to deal with the above problems. Specifically, the BCFDPS mainly introduces bilinear pairing to implicitly verify whether a consumer's real digital identity is contained in a click message to significantly avoid click fraud and employs a consortium blockchain to ensure the transparency of the detection and prevention process. In our scheme, the clicks by machines or fraud ones by a human can be accurately detected and prevented by media sites, publishers, and advertisers. Furthermore, ciphertext-policy attribute-based encryption is adopted to protect the identity privacy of consumers. The implementation and evaluation results show that compared with the existing click fraud detection and prevention schemes based on machine learning and statistical analysis, BCFDPS achieves detection of each fraudulent click with a probability of 100% and consumes lower computation cost; furthermore, BCFDPS adds functions of consumers' privacy protection and click fraud detection and prevention, compared to the existing blockchain-based online advertising scheme, by introducing limited communication cost (4,984 bytes) at lower storage cost.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 实证数据
【DOI】 10.1155/2022/3043489
【Author】 RUIZ RODRIGUEZ, R. A. U. L.
【影响因子】0.000
【主题类别】
区块链治理-法律治理-区块链监管制度
【Abstract】blockchain has become one of the most relevant technologies in recent years, given the potential scope of its various applications. The intrinsically international nature of this technology makes it necessary to study its interaction with the rules of private international law that will very often come into play when using blockchain. A preliminary analysis of the issue leads to the conclusion that, although there is a certain continuity in the application of the current international private law criteria, a review of these rules is advisable in order to update and adapt them to the particularities of each of the different mechanisms derived from the blockchain, so as to increase the degree of legal certainty and promote the use and consolidation of this technology.
你可以尝试使用大模型来生成摘要 立即生成
【Keywords】blockchain; private international law; smart contracts; tort liability; personal data; tokens; arbitration
【发表时间】2022
【收录时间】2022-08-30
【文献类型】 观点阐述
【DOI】 10.17103/reei.43.02
【作者】 蔡耀;蒋黎晅;
【作者单位】南京工业大学建设管理与房地产系;
【文献来源】建筑经济
【复合影响因子】
【综合影响因子】
【主题类别】
区块链应用-实体经济-科研领域
【摘要】以中国知网和Scopus作为数据来源，借助CiteSpace文献计量工具，对收集到的文献数据进行关键词共现和聚类，寻找国内外研究热点，并通过关键词时间线图分析研究趋势。研究结果表明，国内外建筑业对区块链的研究程度和关注点存在差异。
【关键词】区块链;;建筑业;;CiteSpace
【文献类型】 综述
【发表时间】2022-08-30
【作者】 周鼎;段华波;柏静;石军乐;何锋;李水源;冉鹏;
【作者单位】深圳大学;深圳市特区建工集团有限公司;深圳市建设科技促进中心;
【文献来源】建筑经济
【复合影响因子】
【综合影响因子】
【主题类别】
区块链应用-实体经济-建筑领域
【摘要】为促进绿色建材行业有序发展，以及推动区块链产业创新发展，设计构建一个基于区块链技术的绿色建材管理平台。该平台基于联盟链范畴的Hyperledger Fabric技术框架，以绿色建材产业链上下游关系为核心流程逻辑，拟实现产业链上相关组织机构全覆盖，物料流转环节全追踪，以及绿色建材产品交易信息全溯源。最后，着眼于区块链技术在绿色建材行业应用场景的进一步扩展，提出了两条建议。
【关键词】绿色建材;;区块链;;管理平台;;Hyperledger Fabric
【文献类型】 理论模型
【发表时间】2022-08-30