Follow blockchain research across journals, conferences, and preprint repositories.
7,397 results · page 300 of 309
Hoang-Long Nguyen, Jean-Philippe Eisenbarth, Claudia‐Lavinia Ignat, Olivier Perrin
No abstract is available for this record.
Stefan Sfichi
This paper intends to follow the evolution of the processing power needed to mine cryptocurrencies. Because by this year, 2018, they evolved to being over 1500 cryptos, we shell consider reviewing the first 5: Bitcoin, Ethereum, Ripple, Bitcoin Cash and Litecoin (a hierarchy given by coinmarketcap.com. We shall closely overview the first 2: Bitcoin (BTC) and Ethereum (ETH – Ether).
Jean-Marc Seigneur
An overview of blockchain and Distributed Ledger Technologies (DLT) including consensus, PoW, PoS, dBFT, DAG, smart contracts, Ethereum, Stellar, Ripple, Hashgraph Hedera, tokens, tokenomics, cryptocurrencies, ICO...
Gregory S. Rowland, Trevor Kiviat
Digital assets can serve several functions. Some digital assets, such as Bitcoin or Litecoin, are widely regarded as decentralized stores of value or mediums of exchange due to certain common economic features that support these functions; these are sometimes referred to as “pure cryptocurrencies.” Other digital assets, such as Monero or Zcash, are a subset of pure cryptocurrencies that also possess certain features designed to enhance transaction privacy and confidentiality (“privacy-focused coins”). Beyond pure cryptocurrencies and privacy-focused coins, there exists a broad array of general purpose digital assets (“platform coins”), such as Ethereum, NEO and Ravencoin, which are designed to facilitate various peer-to-peer activity, from decentralized software applications to “smart” contracts to digital collectibles, such as CryptoKitties. Platform coins also enable the creation of new digital assets called “tokens”, which are described further herein. The digital asset market extends beyond the assets themselves. As this industry continues to grow, it has captured the attention of retail and institutional investors alike, including asset managers seeking to develop investment strategies and products involving these emerging assets and companies. Some strategies resemble early-stage growth strategies, featuring long-term investments either directly in certain digital assets or in start-up ventures developing complementary goods and services for the industry. Other strategies include hedge fund strategies, such as long/short funds, which often use derivatives, or arbitrage strategies, which seek to capitalize on the price fragmentation across the hundreds of global online exchanges. This chapter outlines the current U.S. regulatory framework applicable to cryptocurrency and other digital asset investment funds (“digital asset funds”) offered to U.S. investors and how those regulatory considerations affect fund structuring decisions.
Kenneth Colon
Over the past decade, there have been many innovations in new payment and care delivery models and technology, from telemedicine to artificial intelligence (AI) to blockchain. These innovations, however, must be used in tandem to drive real change. We review each of these innovations and propose a model for how they can be combined to be greater than the sum of their parts. In doing so, we can create a global, decentralized health system that truly puts patient care at the center, while supporting and further enabling the clinicians who make this care possible, to deliver higher quality care at a fraction of the cost. Keywords: Artificial Intelligence, Behavioral Health, Blockchain, Collaborative Care, Decentralization,Direct Primary Care, Ethereum, Integration, Payment Models, Telemedicine, Virtual Assistants
Jan-Philipp Arps
With the invention of the cryptocurrency Bitcoin in 2009, the world's first blockchain application was developed. While academic research gradually begins to investigate cryptocurrencies more closely and attempt to understand their functioning, technology is rapidly evolving and ecosystems grow exponentially. The research is still scattered and chaotic and has not produced common guidelines. Therefore, the question remains: how sustainable cryptocurrencies and their digital ecosystems are.Only a few models and frameworks take a holistic view on digital sustainability. Only two frameworks were identified that take distributed ledger technologies (blockchain) or cryptocurrencies into consideration: the three governance strategies for digital sustainability of Linkov et al. (2018) and 10 basic conditions of sustainable digital artifacts according to Stuermer, Abu-Tayeh and Myrach (2016). These two frameworks were combined into a new integrated sustainability framework for cryptocurrencies. The developed integrated sustainability framework consists of four dimensions and 12 categories.Existing secondary data, self-conducted social media interviews and practical insights gained through an ASIC mining experiment were used to fill the framework with sufficient data. It confirms Bitcoin's sustainability problems in energy consumption and scalability, highlights Ethereum's great potential as a blockchain platform and explains the higher scalability and faster payment of Ripple and IOTA.While 2017 marked the temporary peak of the cryptocurrency hype, 2018 was a transformative year in which the leading cryptocurrencies were increasingly occupying more specialised niches.
Mads Frederik Madsen, Mikkel Gaub, Malthe Ettrup Kirkbro, Tróndur Høgnason · 6 authors
We study distributed declarative workflow execution in an adversarial setting.In this setting, parties to an agreed-upon workflow do not trust each other to follow that workflow, or suspect the other party might misrepresent proceedings at a later time.We demonstrate how distributed declarative workflow execution can be implemented as smart contracts, guaranteeing (I) enforcement of workflow semantics, and (II) an incontrovertible record of workflow execution history.Crucially, we achieve both properties without relying on a trusted third party.The implementation is based on the Ethereum blockchain, inheriting the security properties (I) and (II) from the guarantees given by that chain.A recurring challenge for both the implementation and the analysis is the cost of operations on Ethereum: This cost must be minimised for honest parties, and an adversary must be prevented from inflicting extra cost on others.
Hoang-Long Nguyen, Claudia‐Lavinia Ignat, Olivier Perrin
Public key server is a simple yet effective way of key management in secure end-to-end communication. To ensure the trustworthiness of a public key server, transparent log systems such as CONIKS employ a tamper-evident data structure on the server and a gossiping protocol among clients in order to detect compromised servers. However, due to lack of incentive and vulnerability to malicious clients, a gossiping protocol is hard to implement in practice. Meanwhile, alternative solutions such as EthIKS are not scalable. This paper presents Trusternity, an auditing scheme relying on Ethereum blockchain that is easy to implement, scalable and inexpensive to operate.
Mira Nagarajan
Cryptocurrency, or digital currency that utilizes blockchain technology and cryptography to encode transactions, has excited many with the promise of minimizing governance. Although the structure of cryptocurrency is inherently decentralized, cryptocurrency relies upon complex relationships between different actors with various functions and roles.. The execution of cryptocurrency thus depends on the mutually satisfying interactions of these actors, who form the basis for non-technical governance structures.\nThis paper investigates the extent to which technical governance mitigates traditional governance problems by examining the governance structures of two cryptocurrencies. It first gives background into the origin and technical value proposition of cryptocurrency, as well as governance theory, before analyzing Bitcoin and Ethereum to understand whEther technology mitigates actors’ motivations. This paper finds that despite cryptocurrency’s promise of minimizing governance, both Bitcoin and Ethereum rely heavily on trust networks, indicating that elements of non-technical governance are, in fact, crucial to their effectiveness.
Christian Masiak, Joern Block, Tobias Masiak, Matthias Neuenkirch · 5 authors
We analyse the triangle of Initial Coin Offerings (ICO) and cryptocurrencies, namely Bitcoin and Ethereum. So far, little is known about the relationship between ICOs, bitcoin and Ether prices. Hence, we employ both bitcoin and Ether prices but also the ICO amount to measure the future development of raised capital in ICOs. First, our results indicate that an ICO has an influence on the subsequent ICO. Second, not only bitcoin prices but also Ether prices play a considerable role with regard to the output of ICO campaigns. However, the effect of Ethereum is of shorter duration on ICO compared to Bitcoin on ICO. A further finding is that the cryptocurrency Bitcoin positively influences Ether. The implications of these findings for investors and entrepreneurial firms are discussed.
Sy, Malick, Morris, Sam
The cryptocurrency market has become increasingly accessible and significant to the financial markets. This is understood by not only major financial firms, governments, and investors, but also the individual market participants globally. We delve into the history of cryptocurrency to begin our examination of the Bitcoin, Ethereum and Litecoin. Understanding the circumstances of their humble beginning, the purpose it served, and the path of their evolution, helps us to create a fuller understanding of its functions, its limitations, and the drivers of its value. This enables us to identify key market factors and variables for deployment within a robust approach for pricing and product offerings associated with Bitcoin, Ethereum and Litecoin. In order to fully capture the volume, variety, and velocity of data associated with these cryptocurrencies, the use of machine learning can provide an advantageous approach to model development for cryptocurrency pricing. This paper provides the development of a promising initial prototype pricing model for Bitcoin, Ethereum and Litecoin. Our proposed pricing models resulted in an average 7% difference between actual and predicted price for Bitcoin and Ethereum, and a 4% difference for Litecoin along a timeline, through the use of machine learning and deep learning, artificial neural networks using the contributing factors of key variables and how they influence and capture pricing and investor behaviour. We also identify theinclusion of additional datasets, such as sentiment market data into the model, along with larger exploration of Blockchain and raw transaction mining to increase the accuracy and forecasting ability of the model.
Evgeniy Shishkin
We describe our efforts towards building a tool that automatically verify high-level functional properties of Ethereum smart contracts against its formal specification that can be given using four different methods: an invariant over contract state or three different types of trace properties. A model of runtime system, the source code of smart contract together with its specification is translated into SMT-solver formula and checked for counter example. We tested the method on simplified version of notorious TheDAO smart-contract, called MiniDAO. Our proof-of-concept tool was able to find a functional property violation of MiniDAO in just several seconds. We believe that the proposed method is indeed useful and deserves deeper investigation.
Theodoros Dounas, Davide Lombardi
We present a proof of concept implementation of an integration strategy for connecting CAD with Blockchain. We explain the components of most blockchains and the value they bring to the built environment ecosystem, the potential impact a complete integration might have and we demonstrate the first two of four levels of integration we have identified between CAD and blockchain technologies. For the purposes of the paper we use Rhino / Grasshopper and Ethereum as the two components of integration.
Ю. В. Баришев
Представлено аналіз технології блокчейн та виконано дослідження криптографічної стійкості її найбільш популярних реалізацій. Визначено вразливі місця реалізацій технології та запропоновано практичні рекомендації щодо усунення визначених недоліків.
Giovanni Angelini, Silvia Emili
No abstract is available for this record.
Bo Xing, Tshilidzi Marwala
No abstract is available for this record.
Yafei Chen, Zhihong Zhang, Beibei Yang
To solve the credibility and supervision lacking problem in the OTC warehouse receipt trading system, a scheme of using smart contract on the blockchain to implement the OTC warehouse receipt trading system is presented. As a distributed ledger, blockchain has the advantages of decentralization, irreversibility and trustworthiness. The warehouse receipt transaction data is recorded on the blockchain, ensuring its safety and credibility. Smart contract is automatically executed code stored on the blockchain, it can directly control the transaction of digital assets. No participant can control and tamper it before the contract is lapsed. In the process of using the Ethereum smart contract to realize warehouse receipt transactions, consensus is reached by the PBFT consensus algorithm, Since the trusted third-party is not needed, the lack of supervision problem is solved. This paper introduces the application of blockchain and smart contract to the OTC warehouse receipt trading system. It includes the design of smart contracts, the verification of smart contracts security. This paper also verifies the feasibility of designing smart contracts by using the instance of listed transactions.
Lauren Burns, Andrea Moro
No abstract is available for this record.
Xuan-Thao Nguyen
As of January 2018, there were 1,384 cryptocurrencies available, and the number continues to grow., The term "cryptocurrencies," for now, at least, covers Bitcoin; altcoins, which are simply coins that are variants or forks of Bitcoin when there is a change in the underlying codes; and tokens.Unlike Bitcoin and coins that operate on separate blockchains, tokens are issued and operated on top of a blockchain.Bitcoin enjoys its enviable leading role among all cryptocurrencies, and Ethereum follows Bitcoin in standing.At the present time and for convenience purposes in the confines of this article, the author will refer to Bitcoin as inclusive of other cryptocurrencies.
Chris Berg, Sinclair Davidson, Jason Potts
No abstract is available for this record.
Stavros Stavroyiannis
Digital currencies and cryptocurrencies have hesitantly started to penetrate the investors, and the next step will be the regulatory risk management framework. We examine the Value-at-Risk and Expected Shortfall properties for Bitcoin and Ethereum, using GARCH methodology and filtered historical simulation. We find the both Bitcoin and Ethereum are subject to a higher risk, therefore, to higher sufficient buffer and risk capital to cover potential losses.
Hua Song, Ence Zhou, Bingfeng Pi, Jun Sun · 6 authors
Battery swapping is a solution of electric vehicle (EV) battery refueling. For EV owners, the battery information and transaction’s correctness, openness, traceability and immutability is difficult to get guarantee in traditional centralized system. The trust lacking between EV owners and swapping station is caused, and becomes a big challenge to EV’s rapid development. An objective mechanism based on decentralized blockchain system is proposed to manage battery swapping and solve the trust lacking issue. With this solution, both battery’s life-cycle information and all operations histories are permanently saved in blockchain network. All key logics are driven by smart contracts, the battery price calculation and the digital currency exchange between EV owners and station are realized by smart contracts automatically and accurately. A primary prototype based on Ethereum is analyzed and implemented to illustrate the feasibility of managing battery swapping and refueling based on blockchain system to solve the trust lacking issue.
Thanos Andrikopoulos, Robert Hudson, Saeed Akbar, Darius Saftoiu
No abstract is available for this record.
Christian Fisch
No abstract is available for this record.