Using Blockchain Technology to Secure the Internet of Things
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Chapter 1 from Byzantine Consensus to Blockchain Consensus
Chapter 1 From Byzantine Consensus to Blockchain Consensus CONTENTS 1.1 Introduction ....................................................... 3 1.2 Byzantine Consensus .............................................. 6 1.2.1 On System Models ........................................ 6 1.2.2 Byzantine Consensus Definitions .......................... 7 1.2.3 FLP Impossibility ......................................... 9 1.2.4 Byzantine Consensus Patterns ............................. 12 1.2.5 Hybrid Models to Reduce Processes ....................... 13 1.2.6 Randomization ............................................ 15 1.3 Blockchains with Nakamoto Consensus ............................. 19 1.3.1 Bitcoin’s Blockchain and Consensus ....................... 19 1.3.2 Blockchain Applications ................................... 24 1.3.3 Nakamoto Consensus Variants ............................. 27 1.4 Blockchains with Byzantine Consensus ............................. 30 1.4.1 Permissioned Blockchains with Byzantine Consensus ....... 30 1.4.2 Permissionless Blockchains with Hybrid Consensus ........ 32 1.5 Conclusion ........................................................ 34 3 4 ⌅ Saunders Template 1.1 Introduction Blockchain is an exciting new technology that is making headlines worldwide. The reasons behind the success of a technology are often unclear, but in the case of block- chain it is safe to say that an important factor is that is has two killer apps, not a single one. The first killer app are cryptocurrencies, as the original blockchain is the core of Bitcoin [128], the first cryptocurrency and the one that is fostering the adoption of cryptocurrencies. The second killer app are smart contracts, first introduced in the Ethereum system [40], with their promise of computerizing legal contracts and of supporting a countless number of applications [161, 153, 90]. Moreover, the sky seems to be the limit for the applications people are imagining for blockchain. A blockchain is essentially a secure, unmodifiable, append-only, log of transac- tions. -
Linking Wallets and Deanonymizing Transactions in the Ripple Network
Proceedings on Privacy Enhancing Technologies ; 2016 (4):436–453 Pedro Moreno-Sanchez*, Muhammad Bilal Zafar, and Aniket Kate* Listening to Whispers of Ripple: Linking Wallets and Deanonymizing Transactions in the Ripple Network Abstract: The decentralized I owe you (IOU) transac- 1 Introduction tion network Ripple is gaining prominence as a fast, low- cost and efficient method for performing same and cross- In recent years, we have observed a rather unexpected currency payments. Ripple keeps track of IOU credit its growth of IOU transaction networks such as Ripple [36, users have granted to their business partners or friends, 40]. Its pseudonymous nature, ability to perform multi- and settles transactions between two connected Ripple currency transactions across the globe in a matter of wallets by appropriately changing credit values on the seconds, and potential to monetize everything [15] re- connecting paths. Similar to cryptocurrencies such as gardless of jurisdiction have been pivotal to their suc- Bitcoin, while the ownership of the wallets is implicitly cess so far. In a transaction network [54, 55, 59] such as pseudonymous in Ripple, IOU credit links and transac- Ripple [10], users express trust in each other in terms tion flows between wallets are publicly available in an on- of I Owe You (IOU) credit they are willing to extend line ledger. In this paper, we present the first thorough each other. This online approach allows transactions in study that analyzes this globally visible log and charac- fiat money, cryptocurrencies (e.g., bitcoin1) and user- terizes the privacy issues with the current Ripple net- defined currencies, and improves on some of the cur- work. -
On the Relationship of Cryptocurrency Price with US Stock and Gold Price Using Copula Models
mathematics Article On the Relationship of Cryptocurrency Price with US Stock and Gold Price Using Copula Models Jong-Min Kim 1 , Seong-Tae Kim 2 and Sangjin Kim 3,* 1 Statistics Discipline, University of Minnesota at Morris, Morris, MN 56267, USA; [email protected] 2 Department of Mathematics, North Carolina A&T State University, Greensboro, NC 27411, USA; [email protected] 3 Department of Management and Information Systems, Dong-A University, Busan 49236, Korea * Correspondence: [email protected] Received: 15 September 2020; Accepted: 20 October 2020; Published: 23 October 2020 Abstract: This paper examines the relationship of the leading financial assets, Bitcoin, Gold, and S&P 500 with GARCH-Dynamic Conditional Correlation (DCC), Nonlinear Asymmetric GARCH DCC (NA-DCC), Gaussian copula-based GARCH-DCC (GC-DCC), and Gaussian copula-based Nonlinear Asymmetric-DCC (GCNA-DCC). Under the high volatility financial situation such as the COVID-19 pandemic occurrence, there exist a computation difficulty to use the traditional DCC method to the selected cryptocurrencies. To solve this limitation, GC-DCC and GCNA-DCC are applied to investigate the time-varying relationship among Bitcoin, Gold, and S&P 500. In terms of log-likelihood, we show that GC-DCC and GCNA-DCC are better models than DCC and NA-DCC to show relationship of Bitcoin with Gold and S&P 500. We also consider the relationships among time-varying conditional correlation with Bitcoin volatility, and S&P 500 volatility by a Gaussian Copula Marginal Regression (GCMR) model. The empirical findings show that S&P 500 and Gold price are statistically significant to Bitcoin in terms of log-return and volatility. -
Vulnerability of Blockchain Technologies to Quantum Attacks
Vulnerability of Blockchain Technologies to Quantum Attacks Joseph J. Kearneya, Carlos A. Perez-Delgado a,∗ aSchool of Computing, University of Kent, Canterbury, Kent CT2 7NF United Kingdom Abstract Quantum computation represents a threat to many cryptographic protocols in operation today. It has been estimated that by 2035, there will exist a quantum computer capable of breaking the vital cryptographic scheme RSA2048. Blockchain technologies rely on cryptographic protocols for many of their essential sub- routines. Some of these protocols, but not all, are open to quantum attacks. Here we analyze the major blockchain-based cryptocurrencies deployed today—including Bitcoin, Ethereum, Litecoin and ZCash, and determine their risk exposure to quantum attacks. We finish with a comparative analysis of the studied cryptocurrencies and their underlying blockchain technologies and their relative levels of vulnerability to quantum attacks. Introduction exist to allow the legitimate owner to recover this account. Blockchain systems are unlike other cryptosys- tems in that they are not just meant to protect an By contrast, in a blockchain system, there is no information asset. A blockchain is a ledger, and as central authority to manage users’ access keys. The such it is the asset. owner of a resource is by definition the one hold- A blockchain is secured through the use of cryp- ing the private encryption keys. There are no of- tographic techniques. Notably, asymmetric encryp- fline backups. The blockchain, an always online tion schemes such as RSA or Elliptic Curve (EC) cryptographic system, is considered the resource— cryptography are used to generate private/public or at least the authoritative description of it. -
A Survey on Volatility Fluctuations in the Decentralized Cryptocurrency Financial Assets
Journal of Risk and Financial Management Review A Survey on Volatility Fluctuations in the Decentralized Cryptocurrency Financial Assets Nikolaos A. Kyriazis Department of Economics, University of Thessaly, 38333 Volos, Greece; [email protected] Abstract: This study is an integrated survey of GARCH methodologies applications on 67 empirical papers that focus on cryptocurrencies. More sophisticated GARCH models are found to better explain the fluctuations in the volatility of cryptocurrencies. The main characteristics and the optimal approaches for modeling returns and volatility of cryptocurrencies are under scrutiny. Moreover, emphasis is placed on interconnectedness and hedging and/or diversifying abilities, measurement of profit-making and risk, efficiency and herding behavior. This leads to fruitful results and sheds light on a broad spectrum of aspects. In-depth analysis is provided of the speculative character of digital currencies and the possibility of improvement of the risk–return trade-off in investors’ portfolios. Overall, it is found that the inclusion of Bitcoin in portfolios with conventional assets could significantly improve the risk–return trade-off of investors’ decisions. Results on whether Bitcoin resembles gold are split. The same is true about whether Bitcoins volatility presents larger reactions to positive or negative shocks. Cryptocurrency markets are found not to be efficient. This study provides a roadmap for researchers and investors as well as authorities. Keywords: decentralized cryptocurrency; Bitcoin; survey; volatility modelling Citation: Kyriazis, Nikolaos A. 2021. A Survey on Volatility Fluctuations in the Decentralized Cryptocurrency Financial Assets. Journal of Risk and 1. Introduction Financial Management 14: 293. The continuing evolution of cryptocurrency markets and exchanges during the last few https://doi.org/10.3390/jrfm years has aroused sparkling interest amid academic researchers, monetary policymakers, 14070293 regulators, investors and the financial press. -
Ethereum Classic Price Prediction 2030
1 Ethereum Classic Price Prediction 2030 Update [06-08-2021] There are various cryptocurrencies out now in the bitcoin market, and people worldwide and mostly in the countries like United States , are investing in these digital currencies. 00000001 Ethereum max 7d low Emax 7d high- 0. And this particular blockchain allows to grants investors security and also control for all of their digital assets. Firstly, we have to be sure about the amount of ETH in our wallet to cover our transaction fees. Once OKExChain supports EVM, developers can use the development tools and languages of Ethereum to develop smart contracts on OKExChain. The contract launched the Beacon Chain, the first stage in the ETH 2. Most are confident that Ethereum 2. Ethereum s Growing Transaction Fees Shouldn t Stop Users. Is Cardano or Ethereum a Better Investment. It was developed in 2017 by Charles Hoskinson, who was previously involved in creating Ethereum itself. In other words, we have defined proof, in the per-coin values of both Bitcoin and Ethereum, that increases of 500 , 1,000 and more are not unprecedented or wildly unreasonable in this market , especially for coins that started out at a few cents. And this has given the latter a significant advantage over the former. At the same time, it is also going to take many other alts with it to new highs. A 10k price is definitely on the cards with so many Decentralized finance apps shifting to their protocols. If Ethereum could hit 10k by the end of 2021 then it would cross the 1 trillion market cap and might become the 2nd cryptocurrency to do so. -
Exploring the Interconnectedness of Cryptocurrencies Using Correlation Networks
Exploring the Interconnectedness of Cryptocurrencies using Correlation Networks Andrew Burnie UCL Computer Science Doctoral Student at The Alan Turing Institute [email protected] Conference Paper presented at The Cryptocurrency Research Conference 2018, 24 May 2018, Anglia Ruskin University Lord Ashcroft International Business School Centre for Financial Research, Cambridge, UK. Abstract Correlation networks were used to detect characteristics which, although fixed over time, have an important influence on the evolution of prices over time. Potentially important features were identified using the websites and whitepapers of cryptocurrencies with the largest userbases. These were assessed using two datasets to enhance robustness: one with fourteen cryptocurrencies beginning from 9 November 2017, and a subset with nine cryptocurrencies starting 9 September 2016, both ending 6 March 2018. Separately analysing the subset of cryptocurrencies raised the number of data points from 115 to 537, and improved robustness to changes in relationships over time. Excluding USD Tether, the results showed a positive association between different cryptocurrencies that was statistically significant. Robust, strong positive associations were observed for six cryptocurrencies where one was a fork of the other; Bitcoin / Bitcoin Cash was an exception. There was evidence for the existence of a group of cryptocurrencies particularly associated with Cardano, and a separate group correlated with Ethereum. The data was not consistent with a token’s functionality or creation mechanism being the dominant determinants of the evolution of prices over time but did suggest that factors other than speculation contributed to the price. Keywords: Correlation Networks; Interconnectedness; Contagion; Speculation 1 1. Introduction The year 2017 saw the start of a rapid diversification in cryptocurrencies. -
Models to Evaluate Service Provisioning Over Cloud
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Archives of the Faculty of Veterinary Medicine UFRGS Revista de Informatica´ Teorica´ e Aplicada - RITA - ISSN 2175-2745 Vol. 26, Num. 3 (2019) 65-74 RESEARCH ARTICLE Models to evaluate service Provisioning over Cloud Computing Environments - A Blockchain-As-A-Service case study Modelos para o provimento de Servic¸os em Ambientes de Computac¸ao˜ em Nuvem - Um estudo de caso aplicado a Blockchain como Servic¸o Carlos Melo1*, Jamilson Dantas2, Paulo Pereira3, Ronierison Maciel4, Paulo Maciel5 Abstract: The strictness of the Service Level Agreements (SLAs) is mainly due to a set of constraints related to performance and dependability attributes, such as availability. This paper shows that system’s availability values may be improved by deploying services over a private environment, which may obtain better availability values with improved management, security, and control. However, how much a company needs to afford to keep this improved availability? As an additional activity, this paper compares the obtained availability values with the infrastructure deployment expenses and establishes a cost × benefit relationship. As for the system’s evaluation technique, we choose modeling; while for the service used to demonstrate the models’ feasibility, the blockchain-as-a-service was the selected one. This paper proposes and evaluate four different infrastructures hosting blockchains: (i) baseline; (ii) double redundant; (iii) triple redundant, and (iv) hyper-converged. The obtained results pointed out that the hyper-converged architecture had an advantage over a full triple redundant environment regarding availability and deployment cost. -
A Scoping Review of Integrated Blockchain-Cloud (Bcc) Architecture for Healthcare: Applications, Challenges and Solutions
sensors Review A Scoping Review of Integrated Blockchain-Cloud (BcC) Architecture for Healthcare: Applications, Challenges and Solutions Leila Ismail 1,2,∗ , Huned Materwala 1,2 and Alain Hennebelle 3 1 Intelligent Distributed Computing and Systems Research Laboratory, Department of Computer Science and Software Engineering, College of Information Technology, United Arab Emirates University, Al Ain, Abu Dhabi 15551, United Arab Emirates; [email protected] 2 National Water and Energy Center, United Arab Emirates University, Al Ain, Abu Dhabi 15551, United Arab Emirates 3 Independent Researcher, Al Ain, Abu Dhabi 15551, United Arab Emirates; [email protected] * Correspondence: [email protected] Abstract: Blockchain is a disruptive technology for shaping the next era of a healthcare system striving for efficient and effective patient care. This is thanks to its peer-to-peer, secure, and transparent characteristics. On the other hand, cloud computing made its way into the healthcare system thanks to its elasticity and cost-efficiency nature. However, cloud-based systems fail to provide a secured and private patient-centric cohesive view to multiple healthcare stakeholders. In this situation, blockchain provides solutions to address security and privacy concerns of the cloud because of its decentralization feature combined with data security and privacy, while cloud provides solutions to the blockchain scalability and efficiency challenges. Therefore a novel paradigm of blockchain-cloud integration (BcC) emerges for the domain of healthcare. In this paper, we provide an in-depth Citation: Ismail, L.; Materwala, H.; analysis of the BcC integration for the healthcare system to give the readers the motivations behind Hennebelle, A. -
The Relationship Between the Popularity of Cryptocurrencies and Their Prices, Returns and Trading Volumes: a Structural Break An
İstanbul İktisat Dergisi - Istanbul Journal of Economics 69, 2019/2, s. 133-157 ISSN: 2602-4152 E-ISSN: 2602-3954 RESEARCH ARTICLE / ARAŞTIRMA MAKALESİ The Relationship Between the Popularity of Cryptocurrencies and their Prices, Returns and Trading Volumes: A Structural Break and Comparative Analysis Kripto Paraların Bilinirliği ile Fiyat, Getiri ve İşlem Hacimleri Arasındaki İlişki: Yapısal Kırılmalı ve Karşılaştırmalı Bir Analiz Mustafa ÖZYEŞİL1 ABSTRACT In this study, the relationship between the popularity of cryptocurrencies and their price, return and trading volumes are examined through time series analysis. The popularity variable is determined according the frequency of cryptocurrencies being DOI: 10.26650/ISTJECON2019-0017 searched on the internet. Stationarity of series is examined by Vogelsang and Perron (1998) structural breaks ADF unit root test. According to the test results, all series are found to be stationary at level values. VAR analyses and impulse-response functions are performed to reveal dynamic interaction between the series. 1Assist. Prof. Dr., Istanbul Aydın University, According to impulse - response test results, returns of BITCOIN Anadolu BIL Vocational School, Department of Business Administration, Istanbul, Turkey decreased against a decreasing shock in the number searches on the internet and its price and trading volume followed a ORCID: M.Ö. 0000-0002-4442-7087 fluctuating course. In order to see the causality relationship Corresponding author/Sorumlu yazar: between variables the Granger causality test -
A Centralized Ledger Database for Universal Audit and Verification
LedgerDB: A Centralized Ledger Database for Universal Audit and Verification Xinying Yangy, Yuan Zhangy, Sheng Wangx, Benquan Yuy, Feifei Lix, Yize Liy, Wenyuan Yany yAnt Financial Services Group xAlibaba Group fxinying.yang,yuenzhang.zy,sh.wang,benquan.ybq,lifeifei,yize.lyz,[email protected] ABSTRACT certain consensus protocol (e.g., PoW [32], PBFT [14], Hon- The emergence of Blockchain has attracted widespread at- eyBadgerBFT [28]). Decentralization is a fundamental basis tention. However, we observe that in practice, many ap- for blockchain systems, including both permissionless (e.g., plications on permissioned blockchains do not benefit from Bitcoin, Ethereum [21]) and permissioned (e.g., Hyperledger the decentralized architecture. When decentralized architec- Fabric [6], Corda [11], Quorum [31]) systems. ture is used but not required, system performance is often A permissionless blockchain usually offers its cryptocur- restricted, resulting in low throughput, high latency, and rency to incentivize participants, which benefits from the significant storage overhead. Hence, we propose LedgerDB decentralized ecosystem. However, in permissioned block- on Alibaba Cloud, which is a centralized ledger database chains, it has not been shown that the decentralized archi- with tamper-evidence and non-repudiation features similar tecture is indispensable, although they have been adopted to blockchain, and provides strong auditability. LedgerDB in many scenarios (such as IP protection, supply chain, and has much higher throughput compared to blockchains. It merchandise provenance). Interestingly, many applications offers stronger auditability by adopting a TSA two-way peg deploy all their blockchain nodes on a BaaS (Blockchain- protocol, which prevents malicious behaviors from both users as-a-Service) environment maintained by a single service and service providers. -
Accelerating Software Delivery with Cloudbees
BLOCKCHAIN-AS-A-SERVICE ACCELERATINGTaking POCs to production with SOFTWARE BlockApps and Red DELIVERY Hat WITH CLOUDBEES JENKINS & RED HAT OPENSTACK SOLUTION BRIEF SOLUTION BRIEF BLOCKAPPS EXPERIENCE BUILD AND TEST NEW ENTERPRISE BLOCKCHAIN APPS RAPIDLY • Over 1,000 BlockApps blockchain Pressure to meet the growing demands of international customers are driving financial services organi- projects in development zations to look for innovative software solutions to distinguish themselves in the marketplace. One of the • Over 100 enterprises building most significant technologies to emerge is the blockchain application, a disruptive shift in architecture solutions on BlockApps that will change how enterprises manage their data, applications, transactions, and business processes. • Contributing member of Ethereum developer community Until now, it has been costly to test and prove the value of blockchain applications in a secure, enterprise- ready environment built on proprietary software. Red Hat and BlockApps are removing those barriers. We have joined forces to help you build innovative proofs-of-concepts and enterprise-ready blockchain applications— RED HAT OPENSHIFT all running on Red Hat® Enterprise Linux® in an OpenShift container. BUSINESS VALUE According to IDC,1 Red Hat The BlockApps STRATO Blockchain Platform includes Ethereum-based features and tools that are designed OpenShift customers experienced: specifically for enterprise businesses to build proofs-of-concepts (POCs) quickly and cost-effectively. Using Red • 66% faster application Hat Enterprise Linux and Red Hat OpenShift Container Platform, you can seamlessly move from development development life cycles and test to full production of your blockchain applications. • 35% less IT staff per applications • 38% lower IT infrastructure costs per application BLOCKAPPPS STRATO BLOCKCHAIN PLATFORM The BlockApps STRATO Blockchain Platform offers customizable transaction processing capabilities and con- 1 IDC White Paper – “The Business Value of Red Hat OpenShift,” Oct.