Blockchain Papers

Alexander Egberts

No abstract is available for this record.

Kristian Lauslahti, Juri Mattila, Timo Seppälä

No abstract is available for this record.

Angwei Law

Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, System Design and Management Program, 2017.

Eric Tjong Tjin Tai

No abstract is available for this record.

James Hazard, Helena Haapio

Modern economies are held together by innumerable contracts. However, current contracts are neither machine-readable nor easily human-readable. The Ricardian Contract paradigm of parameters, prose and code posits a hybrid model of automation and conventional legal text. This paper connects recent work on design criteria for 'Smart Contract Templates' with prose objects and prototype inheritance demonstrated at CommonAccord. Templates authored and shared as prose objects can become the basis for automation, codification, commentary, big data analysis and graphic presentations.

Jeffrey Chu, Stephen Chan, Saralees Nadarajah, Joerg Osterrieder

No abstract is available for this record.

Usman W. Chohan

No abstract is available for this record.

Mukesh Thakur

Over past decade cloud services have enabled individuals and organizations to perform different types of tasks such as online storage, email services, on-demand movies and TV shows. The cloud services has also enabled on-demand deployment of applications, at cheap cost with elastic and scalable, fault tolerant system. These cloud services are offered by cloud providers who use authentication, authorization and accounting framework based on client-server model. Though this model has been used over decades, study shows it is vulnerable to different hacks and it is also inconvenient to use for the end users. In addition, the cloud provider has total control over user data which they are able to monitor, trace, leak and even modify at their will. Thus, the user data ownership, digital identity and use of cloud services has raised privacy and security concern for the users. In this thesis, Blockchain and its applications are studied and alternative model for authentication, authorization and accounting is proposed based on Ethereum Blockchain. Furthermore, a prototype is developed which enables users to consume cloud services by authenticating, authorizing and accounting with a single identity without sharing any private user data. Experiments are run with the prototype to verify that it works as expected. Measurements are done to assess the feasibility and scalability of the solution. In the final part of the thesis, pros and cons of the proposed solution are discussed and perspectives for further research are sketched.

Ben Van Vliet

No abstract is available for this record.

Andrew Urquhart

No abstract is available for this record.

Till Neudecker, Hannes Hartenstein

No abstract is available for this record.

Nashirah Abu Bakar, Sofian Rosbi, Kiyotaka Uzaki

This paper analyses the operation of cryptocurrency system in perspective of Islamic finance. The purpose of this study is to evaluate the cryptocurrency framework whether it is meet the Islamic Finance rule. In addition, this study performed in providing the Islamic minded investor a proper information regarding investment in Bitcoin. Cryptocurrency is a digital currency in which encryption techniques that implement to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank. A transaction is a transfer of Bitcoin value that is broadcast to the network and collected into blocks. A transaction typically references previous transaction outputs as new transaction inputs and dedicates all input Bitcoin values to new outputs. This cryptocurrency has no physical form and exists only in the network. Bitcoin also has no intrinsic value in that it is not redeemable for another commodity, namely gold. Then, this study evaluates the framework according to Islamic Finance rule. The bitcoin account holder is anonymous. Therefore, it is difficult to track the real account holder if any suspicious activity occurs. In addition, the value of Bitcoin is unstable because of high volatility. Bitcoin also suffers variance in perceptions of Bitcoin’s store of value and method of value. All of these three conditions contribute to uncertainty in transaction framework of Bitcoin. As a conclusion, Bitcoin transaction is classified as a transaction with high uncertainty (gharar).

Louis Tessler, Tim Byrnes

Bitcoin is a digital currency and payment system based on classical cryptographic technologies which works without a central administrator such as in traditional currencies. It has long been questioned what the impact of quantum computing would be on Bitcoin, and cryptocurrencies in general. Here, we analyse three primary directions that quantum computers might have an impact in: mining, security, and forks. We find that in the near-term the impact of quantum computers appear to be rather small for all three directions. The impact of quantum computers would require considerably larger number of qubits and breakthroughs in quantum algorithms to reverse existing hash functions.

Evita Stenqvist, Jacob Lönnö

Programmatically deriving sentiment has been the topic of many a thesis: it’s application in analyzing 140 character sentences, to that of 400-word Hemingway sentences; the methods ranging from naive rule based checks, to deeply layered neural networks. Unsurprisingly, sentiment analysis has been used to gain useful insight across industries, most notably in digital marketing and financial analysis. An advancement seemingly more excitable to the mainstream, Bitcoin, has risen in number of Google searches by three-folds since the beginning of this year alone, not unlike it’s exchange rate. The decentralized cryptocurrency, arguably, by design, a pure free market commodity – and as such, public perception bears the weight in Bitcoins monetary valuation. This thesis looks toward these public perceptions, by analyzing 2.27 million Bitcoin-related tweets for sentiment fluctuations that could indicate a price change in the near future. This is done by a naive method of solely attributing rise or fall based on the severity of aggregated Twitter sentiment change over periods ranging between 5 minutes and 4 hours, and then shifting these predictions forward in time 1, 2, 3 or 4 time periods to indicate the corresponding BTC interval time. The prediction model evaluation showed that aggregating tweet sentiments over a 30 min period with 4 shifts forward, and a sentiment change threshold of 2.2%, yielded a 79% accuracy.

Cristina Pérez‐Solà, Sergi Delgado-Segura, Guillermo Navarro‐Arribas, Jordi Herrera‐Joancomartí

Zero-confirmation transactions, i.e. transactions that have been broadcast but are still pending to be included in the blockchain, have gained attention in order to enable fast payments in Bitcoin, shortening the time for performing payments. Fast payments are desirable in certain scenarios, for instance, when buying in vending machines, fast food restaurants, or withdrawing from an ATM. Despite being quickly propagated through the network, zero-confirmation transactions are not protected against double-spending attacks, since the double-spending protection Bitcoin offers relies on the blockchain and, by definition, such transactions are not yet included in it. In this paper, we propose a double-spending prevention mechanism for Bitcoin zero-confirmation transactions. Our proposal is based on exploiting the flexibility of the Bitcoin scripting language together with a well-known vulnerability of the ECDSA signature scheme to discourage attackers from performing such an attack.

Dirk G. Baur, Thomas Dimpfl

No abstract is available for this record.

Nashirah Abu Bakar, Sofian Rosbi

The cryptocurrency is a decentralized digital money. Bitcoin is a digital asset designed to work as a medium of exchange using cryptography to secure the transactions, to control the creation of additional units, and to verify the transfer of assets. The objective of this study is to forecast Bitcoin exchange rate in high volatility environment. Methodology implemented in this study is forecasting using autoregressive integrated moving average (ARIMA). This study performed autocorrelation function (ACF) and partial autocorrelation function (PACF) analysis in determining the parameter of ARIMA model. Result shows the first difference of Bitcoin exchange rate is a stationary data series. The forecast model implemented in this study is ARIMA (2, This model shows the value of Rsquared is 0.444432. This value indicates the model explains 44.44% from all the variability of the response data around its mean. The Akaike information criterion is 13.7805. This model is considered a model with good fitness. The error analysis between forecasting value and actual data was performed and mean absolute percentage error for ex-post forecasting is 5.36%. The findings of this study are important to predict the Bitcoin exchange rate in high volatility environment. This information will help investors to predict the future exchange rate of Bitcoin and in the same time volatility need to be monitor closely. This action will help investors to gain better profit and reduce loss in investment decision.

Dirk G. Baur, Daniel Cahill, Keith M. Godfrey, Zhangxin Liu

No abstract is available for this record.

Svetlana Sapuric, Angelika Kokkinaki, Ifigenia Georgiou

This study provides a comparative financial and statistical analysis between the largest and most trad- ed cryptocurrencies. In particular, the exchange rates of Bitcoin, Litecoin, Ripple and Ethereum were collected from August 2010 until May 2017. The raw annualized volatility of cryptocurrencies is compared as well as to fiat currencies and major exchange rates. The results show that Bitcoin is the least volatile cryptocurrency with low correlations with the altcoins, providing possible diversification benefits to cryptocurrency investing. In addition, our results indicate that Bitcoin is the only cryptocurrency that has causality effects on the other cryptocurrencies.

Joseph M. Woodside, Fred K. Augustine, Will Giberson

Purpose: The purpose of this paper is to review the acceptance and future use of blockchain technology. Given the rapid technological changes, this paper focuses on a managerial overview and framework of how the blockchain, including its implementations such as Bitcoin have advanced and how blockchain can be utilized in large-scale, enterprise environments. The paper begins with a technological overview that covers the history of the technology, as well as describing the computational, cryptographic theory that serves as the basis for its notable security features. This paper also covers several key application areas such as finance, accounting, and marketplaces where blockchain technology is seeing major investments from some of the world’s largest organizations. Analysis Methods: Triangulation is utilized for this paper, which combines multiple methodologies, such as qualitative and quantitative methods, as complementary components for improving research study accuracy. The triangulation methods chosen for this paper include a secondary data environment analysis, a text analysis, and financial analysis in order to successfully manage and review the adoption diffusion of innovative technologies like blockchain. The blockchain stands to disrupt many areas of society with the proper application and thus it is important to examine its use with as many viewpoints as possible. Contributions and Conclusion: The contribution this paper describes the potential drivers and drawbacks of blockchain technology in real world applications and highlights the managerial implications of its use. This paper also expands the theoretical contributions for identifying blockchain technology progress on the diffusion of innovation curve. As it stands, the blockchain is within the innovation stage in terms of its application in multi-national enterprises, but with major firms making investments, the blockchain could see growing normalization and acceptance, and at an inflection point akin to the Internet of the 1990s.

Jacob Eberhardt, Stefan Tai

No abstract is available for this record.

Paul Catchlove

Given the rise of interest, opportunities and use of smart contracts, it is important to understand what they are, what technology they rely upon and how they function so that it can be ascertained whether this new technology requires additional regulation, or whether the law as it stands is adequate to administer their usage. This paper will outline two key contentions. First, that smart contracts are well managed by existing contract law principles, however, there are some novel issues associated with this new technology. Second, this paper will suggest a resolution on how to take these novel issues into consideration and ensure they are overcome.

Henry Kim, Marek Laskowski

The blockchain constitutes a technology-based, rather than social or regulation based, means to lower uncertainty about one another in order to exchange value. However, its use may very well also lead to increased complexity resulting from having to subsume work that displaced intermediary institutions had performed. We present our perspective that smart contracts may be used to mitigate this increased complexity. We further posit that smart contracts can be delineated according to complexity: Smart contracts that can be verified objectively without much uncertainty belong in an inter- organizational context; those that cannot be objectively verified belong in an intra- organizational context. We state that smart contracts that implement a formal (e.g. mathematical or simulation) model are especially beneficial for both contexts: They can be used to express and enforce inter-organizational agreements, and their basis in a common formalism may ensure effective evaluation and comparison between different intra-organizational contracts. Finally, we present a case study of our perspective by describing Intellichain, which implements formal, agent-based simulation model as a smart contract to provide epidemiological decision support.

G Jaccard

This paper gives an overview on smart contracts and assess their legal relevance. The first part, explains the notion of smart contract and provides simple examples of it. In the second part, we propose a legal analysis of smart contract. First, we explore how smart contracts can be relevant in the eyes of the law. Then we differentiate and assess smart contract with regards to their types. And finally, we look at chosen problematic of smart legal contracts.