Follow blockchain research across journals, conferences, and preprint repositories.
95,526 results · page 3578 of 3,981
Juan A. Garay, Aggelos Kiayias, Nikos Leonardos
No abstract is available for this record.
Michael Taylor
Since its deployment in 2009, Bitcoin has achieved remarkable success and spawned hundreds of other cryptocurrencies. The author traces the evolution of the hardware underlying the system, from early GPU-based homebrew machines to today’s datacenters powered by application-specific integrated circuits. These ASIC clouds provide a glimpse into planet-scale computing’s future.
Wing Hong Chan, Minh Le, Yan Wendy Wu
No abstract is available for this record.
Andrew Urquhart
Investor and media attention in Bitcoin has increased substantially in recently years, reflected by the incredible surge in news articles and considerable rise in the price of Bitcoin. Given the increased attention, there little is known about the behaviour of Bitcoin prices and therefore we add to the literature by studying price clustering. We find significant evidence of clustering at round numbers, with over 10% of prices ending with 00 decimals compared to other variations but there is no significant pattern of returns after the round number. We also support the negotiation hypothesis of Harris (1991) by showing that price and volume have a significant positive relationship with price clustering at whole numbers.
David Easley, Maureen O’Hara, Soumya Basu
No abstract is available for this record.
Mehmet Balcılar, Elie Bouri, Rangan Gupta, David Roubaud
Prior studies on the price formation in the Bitcoin market consider the role of Bitcoin transactions at the conditional mean of the returns distribution. This study employs in contrast a non-parametric causality-in-quantiles test to analyse the causal relation between trading volume and Bitcoin returns and volatility, over the whole of their respective conditional distributions. The nonparametric characteristics of our test control for misspecification due to nonlinearity and structural breaks, two features of our data that cover 19th December 2011 to 25th April 2016. The causality-in-quantiles test reveals that volume can predict returns- except in Bitcoin bear and bull market regimes. This result highlights the importance of modelling nonlinearity and accounting for the tail behaviour when analysing causal relationships between Bitcoin returns and trading volume. We show, however, that volume cannot help predict the volatility of Bitcoin returns at any point of the conditional distribution.
Anil Lamba, Satinderjeet Singh, Singh Balvinder, Natasha Dutta · 5 authors
The internet of things (IoT) enabled a common operating picture (COP) across the various applications of modern day living. The COP is achieved through the advancements seen in wireless sensor network devices that were able to communicate through the network thereby exchanging information and performing various analysis. In IoT, the exchange of information and data authentication is only done through the central server there by leading to the security and privacy concerns. Chances of device spoofing, false authentication, less reliability in data sharing could happen. To address such security and privacy concerns, a central server concept is eliminated and blockchain (BC) technology is introduced as a part of IoT. This paper elaborates the possible security and privacy issues considering the component interaction in IoT and studies how the distributed ledger based blockchain (DLBC) technology contribute to it. Applications of BC with respect to focused sectors and category were clearly studied here. Various challenges specific to IoT and IoT with BC were also discussed to understand blockchain technology contribution.
Mark Staples, Andrew Reeson, R. Galen Hanson
No abstract is available for this record.
Rune Tevasvold Aune, Maureen O’Hara, Ouziel Slama
No abstract is available for this record.
Justin Macinante
In spite of the apparent lack of success of international emission trading under the Kyoto Protocol, numerous jurisdictions are implementing mitigation mechanisms that put a price on carbon, whether by taxing activities that cause release of carbon to the atmosphere, or by creating markets through which the cost of atmospheric release of carbon is internalised to the relevant activities by way of emission trading schemes. These diverse and heterogeneous mechanisms – in particular the emission trading schemes – might achieve greater efficiency, larger scale, and other benefits, were they to be connected. Against this background, this paper sets out a proposal for a conceptual model for the networking of emission trading schemes, built on the architecture of distributed ledger technology. In this way, it is argued, the interconnection of these emission trading schemes might be achieved flexibly, cost effectively and efficiently, while taking account of the requirements for cooperative approaches, evidenced in the Paris Agreement. The purpose of the paper is to stimulate, and provide a starting point for, more detailed, intensive discussion of what the technical requirements might be of some such scheme.
Advait Deshpande, Katherine Stewart, Louise Lepetit, Salil Gunashekar
No abstract is available for this record.
Ethan Cecchetti, Fan Zhang, Yan Ji, Ahmed E. Kosba · 6 authors
Blockchains and more general distributed ledgers are becoming increasingly popular as efficient, reliable, and persistent records of data and transactions. Unfortunately, they ensure reliability and correctness by making all data public, raising confidentiality concerns that eliminate many potential uses. In this paper we present Solidus, a protocol for confidential transactions on public blockchains, such as those required for asset transfers with on-chain settlement. Solidus operates in a framework based on real-world financial institutions: a modest number of banks each maintain a large number of user accounts. Within this framework, Solidus hides both transaction values and the transaction graph (i.e., the identities of transacting entities) while maintaining the public verifiability that makes blockchains so appealing. To achieve strong confidentiality of this kind, we introduce the concept of a Publicly-Verifiable Oblivious RAM Machine (PVORM). We present a set of formal security definitions for both PVORM and Solidus and show that our constructions are secure. Finally, we implement Solidus and present a set of benchmarks indicating that the system is efficient in practice.
Adrian Jackson, Ashley Lloyd, Justin Macinante, Markus HHwener
No abstract is available for this record.
Benno Ferrarini, Julie A. Maupin, Marthe Hinojales
No abstract is available for this record.
Paul Fremantle, Benjamin Aziz, Tom Kirkham
The Internet of Things has a number of well-publicised security flaws, resulting in numerous recent attacks.In this paper we lay out a framework for looking at how distributed ledgers and Blockchain technology can be used to enhance the security, privacy and manageability of IoT devices and networks.A significant concern is the inability to process blockchains on small devices.We propose an architecture for IoT security and privacy based on blockchains that addresses this and other issues.We look at related work and propose areas of further research.
Meghna Bal
India registered rapid economic growth over the past couple of years, with the GDP growing 7.6 percent in 2015-2016. While economic activity remains buoyant, however, the country still has a long way to go. The government must capitalise on the current economic momentum and use it to accelerate its reform agenda. One of the areas requiring regulatory attention is the property market. Despite a push for reform through the Digital India Land Records Modernization Programme (DILRMP), India’s current land title system remains plagued with deficiencies. There is a need for a standardised property rights regime if India aims to be an economic powerhouse. To bolster current systems, a decentralised, open, and transparent method of record-keeping must be introduced, supplemented by a legal framework capable of guaranteeing and enforcing property rights. A possible solution to the current record-keeping conundrum lies in blockchain technology.
Harish Natarajan, Solvej Karla Krause, Helen Luskin Gradstein
The financial sector is currently undergoing a major transformation, brought about by the rapid development and spread of new technologies. The confluence of ‘finance’ and ‘technology’ is often referred to as ‘Fintech’, typically describing companies or innovations that employ new technologies to improve or innovate financial services. ‘Fintech’ developments are seen across all areas of the financial sector, including payments and financial infrastructures, consumer and SMElending, insurance, investment management, and venture financing. This note on distributed ledger technology (DLT) and blockchains is part of a series of short notes that explore new trends and developments in Fintech and analyze their potential relevance for WBG activities. Forthcoming notes in this series will cover marketplace lending, ‘InsureTech’, and other topics. This note outlines the mechanisms, origins, and key characteristics of DLT; the difference between ‘public’ and ‘private’ DLT; the technology’s main advantages, challenges, and risks; relevant examples of DLT applications (with a focus on financial sector applications); and a brief overview of activities by governments, multilateral organization, and other stakeholders in this space. Finally, this note proposes next steps for the World Bank to study and evaluate areas where DLT could potentially be integrated into World Bank financial sector operations.
Patrick Schueffel
The Blockchain technology will soon be ten years of age. What does not sound a lot in absolute terms is a substantial age in a fast-paced and ever changing technological environment. Large unnoticed by the majority of authors on distributed ledger technologies two alternative technologies have recently emerged: Tangle, and Hashgraph. This article provides an introduction to the three main alternative distributed ledger technologies, Blockchain, Tangle and Hashgraph and yields a high-level comparison.
Victoria L. Lemieux, Manu Sporny
Distributed cryptographic ledgers, such as the blockchain, are now being used in recordkeeping. However, they lack a key feature of more traditional recordkeeping systems needed to establish the authenticity of records and enable reliance on them for trustworthy recordkeeping. The missing feature is known in archival science as the archival bond -- the mutual relationship that exists among documents by virtue of the actions in which they participate. In this paper, we propose a novel data model and syntax using core web principles that can be used to address this shortcoming in distributed ledgers as recordkeeping systems.
Sarah Azouvi, Mustafa Al-Bassam, Sarah Meiklejohn
No abstract is available for this record.
James A. Cunningham, John Ainsworth
The rise of distributed ledger technology, initiated and exemplified by the Bitcoin blockchain, is having an increasing impact on information technology environments in which there is an emphasis on trust and security. Management of electronic health records, where both conformation to legislative regulations and maintenance of public trust are paramount, is an area where the impact of these new technologies may be particularly beneficial. We present a system that enables fine-grained personalized control of third-party access to patients' electronic health records, allowing individuals to specify when and how their records are accessed for research purposes. The use of the smart contract based Ethereum blockchain technology to implement this system allows it to operate in a verifiably secure, trustless, and openly auditable environment, features crucial to health information systems moving forward.
Andreas Ellervee, Raimundas Matulevičius, Nicolas Mayer
No abstract is available for this record.
Allan Third, John Domingue
Searching for information in distributed ledgers is currently not an easy task, as information relating to an entity may be scattered throughout the ledger with no index. As distributed ledger technologies become more established, they will increasingly be used to represent real world transactions involving many parties and the search requirements will grow. An index providing the ability to search using domain specific terms across multiple ledgers will greatly enhance to power, usability and scope of these systems.
Chris Khan, Antony Lewis, Emily Rutland, Clemens Wan · 6 authors
R3 has built a global consortium to focus on the application of distributed-ledger technology (DLT), which can help banks combat low return on equity and alleviate pressure on their operating costs. The authors explain the conditions that led to interest in DLT and introduce Corda, R3's shared ledger for recording and managing financial agreements.