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13,493 results · page 353 of 563
Jayamine Alupotha, Xavier Boyen, Matthew McKague
No abstract is available for this record.
Máté Zsolt Nagy
A második generációs blokkláncokon élő „smart contractok”, avagy okosszerződések egyre gyakrabban használt eszközök különböző problémák decentralizált megoldásához. Habár leggyakrabban a DeFi (decentralized finance, avagy decentralizált pénzügyek) területén használják, máshol is alkalmazhatóak, mint például ellenőrizhető szavazások vagy árverések. Egyre több és több okosszerződést használnak különféle területeken, mint például új kriptovaluták implementálásához egy létező blokkláncon, vagy automatikus pénzváltók üzemeltetéséhez. Az Ethereumot éppen ezért gyakran hívják "programozható pénznek". Az Ethereumon az EVM bájtkódjában lévő programok futnak. Ezeket sokféle nyelvből lehet fordítani, de az egyik első és legismertebb az a Solidity, amely kifejezetten okosszerződések írásához lett kifejlesztve. A szakdolgozat tárgya egy olyan okosszerződés létrehozása Solidity nyelv és keretrendszer segítségével, amellyel meg lehet osztani és közösen módosítani dokumentumokat. A szerződés célja még a: – Nyomonkövethetőség (ki, mikor, mit módosított) – Bizalmasság (ki olvashatja a tartalmat) – Hozzáféréskezelés (ki módosíthatja a tartalmat)
Tomás Honório, Catarina I. Reis, Marco Oliveira, Marisa Maximiano
No abstract is available for this record.
Vishram B. Sawant, Shivraj Gaikwad, Chetan Dhangar, Sujata Oak
No abstract is available for this record.
Oliver Stengele, Christina Westermeyer, Hannes Hartenstein
Software can be described, like human users and other objects, through attributes. For this work, we define software attributes as humanly verifiable, falsifiable, or judgeable statements regarding characteristics of said software. Much like attributes in general, software attributes require robust identities for their source but also for their target, meaning a software in general or a binary in particular. As software can be of critical importance, performing an independent review of attribute claims appears beneficial. We posit that decentralized platforms that were developed and refined over the past decade can bridge the gap between existing tools and methods for software review and their open, transparent, and accountable use for the benefit of users. In this work, we explore the feasibility and implications of decentralizing an independent review of software attribute claims. We envision the decentralization of a review process from initialization and execution to the persistent recording of results. We sketch the available design space by decomposing the overall process into a modular design and describe how each component covers overarching objectives. To illustrate practical implications and trade-offs, we present ETHDPR, a proof of concept implementation based on Ethereum and IPFS. Through a quantitative and qualitative evaluation, we show that a decentralized software review is practically feasible. We illustrate the flexibility of the proposed approach using a toy example of a software component in automotive systems. Lastly, we provide a discussion on fundamental limits and open issues of facilitating independent reviews via technological means.
Sadah Anjum Shanto
With regards to the COVID-19 pandemic, the fast carry out of an antibody and the execution of an overall vaccination crusade is basic, yet its prosperity will rely upon the accessibility of a functional and straightforward circulation chain that can be evaluated by all applicable partners. In this paper, we examine how blockchain innovation can help in a few parts of COVID-19 inoculation conspire. We present a framework in which blockchain innovation is utilized to surety information honesty and permanence of recipient enlistment for immunization, keeping away from character burglaries and pantomimes. Smart contracts are characterized to screen and track the legitimate antibody dissemination conditions against the protected dealing with rules characterized by antibody makers empowering the familiarity with all organization peers. For immunization organizations, a straightforward and sealed answer for aftereffects self-detailing is given by thinking about the recipient, what's more, administrated antibody affiliation. A model was executed utilizing the Ethereum test organization, Ropsten, considering the COVID-19 immunization dissemination conditions. The outcomes acquired for each on-chain activity can be checked and approved on the Etherscan. Regarding throughput and versatility, the proposed blockchain framework shows promising outcomes while the assessed cost concerning gas for inoculation situation in view of genuine information stays inside sensible cutoff points.
Yang Han, Dawei Xu, Jiaqi Gao, Liehuang Zhu
No abstract is available for this record.
Daniel Kraft
No abstract is available for this record.
James Grimmelmann
No abstract is available for this record.
Pingcheng Ruan, Tien Tuan Anh Dinh, Dumitrel Loghin, Meihui Zhang · 5 authors
No abstract is available for this record.
S. Shireen Siddique, N. Sabiyath Fatima
Creating digital content and distributing them has become much easier and convenient nowadays, where the digital content creator can create the content and also distribute their work to others from anywhere with the help of internet. This also has the risk as the content is distributed using internet, the risk being copyright infringement and illegal distribution of the content. To avoid these types of risks the content creators are opting towards the help of digital rights management. The digital rights management team provides help and support to the content creators in cases where their work is illegally copied or distributed. To get the digital content copyrighted is also not an easy task as it consumes time and money. The proposed model overcomes these issues by integrating digital signature, structure similarity index measurement (SSIM) and blockchain technology in the digital rights management life cycle. The digital signature is used to uniquely identify the user and the related information can be traced back to the user using digital signature, and the copyright is provided using the SSIM method. The SSIM value can be in the range of -1 to 1 where 1 denotes that both the media files are identical and the system updates this information so that all the participant can view this information. If the SSIM value after comparing both the media files is -1 then the both images are unique and authentic, then the copyright is provided for the media file and this information is updated in the system as well as Ethereum blockchain. This makes the system more secure, robust and transparent.
Noel Opala, Annika Fischer, Martin Svoboda
Cryptocurrencies show some properties that differ from typical financial instruments. For example, dynamic volatility, larger price jumps, and other market participants and their associated characteristics can be observed (Pardalos, Kotsireas, Guo, & Knottenbelt, 2020). Especially high tail risk (Sun, Dedahanov, Shin, & Li, 2021; Corbet, Meegan, Larkin, Lucey, & Yarovaya, 2018; Borri, 2019) leads to the question of whether the methods and procedures established in risk management are suitable for measuring the resulting market risks of cryptos appropriately. Therefore, we examine the risk measurement of Bitcoin, Ethereum, and Litecoin. In addition to the classic methods of market risk measurement, historical simulation, and the variance-covariance approach, we also use the extreme value theory to measure risk. Only the extreme value theory with the peaks-over-threshold method delivers satisfactory backtesting results at a confidence level of 99.9%. In the context of our analysis, the highly volatile market phase from January 2021 was crucial. In this, extreme deflections that have never been observed before in the time series have significantly influenced backtesting. Our paper underlines that critical market phases could not be sufficiently observed from the short time series, leading to adequate backtesting results under the standard market risk measurement. At the same time, the strength of the extreme value theory comes into play here and generates a preferable risk measurement.
Paul P. Momtaz, Rachel J. Nam, Christian Fisch
No abstract is available for this record.
Zhonghao Yuan, Jiaojiao Wu, Jianpeng Gong, Yao Liu · 6 authors
Data owners outsource their data to remote storage providers without keeping local replicas to save their precious storage resources. However, the ownership and management of data are separated after outsourcing. How to ensure the integrity and recoverability of outsourced data becomes a significant problem. Provable Data Possession (PDP) and Proofs of Retrievability (POR) are two cryptographic protocols that enable users to verify the integrity of outsourced data. Nevertheless, the state‐of‐the‐art PDP and POR schemes either need users to perform the complicated audit tasks by themselves or delegate these tasks to a Third‐Party Auditor (TPA). Moreover, these schemes are constructed on a centralized storage framework which vulnerably suffers single‐point‐of‐failure. In this paper, we propose a blockchain‐based decentralized self‐auditing scheme with batch verification. Firstly, data owners outsource their data to decentralized storage nodes, which can achieve self‐auditing based on blockchain without TPA. Secondly, our scheme uses Pedersen‐based polynomial commitment to significantly reduce the number of authenticators. Furthermore, we propose a batch verification algorithm, which can verify multiple proofs from different storage nodes to improve the verification efficiency. Finally, we analyze the security of our scheme and implement a gas‐efficient system prototype using the smart contracts of the Ethereum Reposten test network. The results demonstrate that the scheme is practical.
Harsha Aggarwal, Rahul Johari, Deo Prakash Vidyarthi, Kalpana Gupta · 5 authors
No abstract is available for this record.
K. S. Shilpa, Brahadeesh Kishore, Peter Neil, Nilesh Jain · 5 authors
No abstract is available for this record.
Dongfang Zhao
No abstract is available for this record.
Atheer Alkhammash, Kawther Saeedi, Fatmah Baothman, Rania Aboalela · 5 authors
Blockchain is an emerging technology that is used to address ownership, centrality, and security issues in different fields. The blockchain technology has converted centralized applications into decentralized and distributed ones. In existing sharing economy applications, there are issues related to low efficiency and high complexity of services. However, blockchain technology can be adopted to overcome these issues by effectively opening up secure information channels of the sharing economy industry and other related parties, encouraging industry integration and improving the ability of sharing economy organizations to readily gain required information. This paper discusses blockchain technology to enhance the development of insurance services by proposing a five-layer decentralized model using Ethereum platform. The Najm for Insurance Services Company in Saudi Arabia was employed in a case study for applying the proposed model to effectively solve the issue of online underwriting, and to securely and efficiently enhance the verification and validation of transactions. The paper concludes with a review of the lessons learned and provides suggestions for blockchain application development process.
Khushi Patel, Dipak Ramoliya, Kashish Sorathia, Foram Bhut
No abstract is available for this record.
Sarat Chandra Nayak, Sanjib Kumar Nayak, Sanjib Kumar Nayak, Sanjib Kumar Nayak
No abstract is available for this record.
Rishikesh Choudhari, Meghana Shivakumar, Shreyas Nandavar, Shruti Maigur · 7 authors
No abstract is available for this record.
Debendranath Das, Amudhan Muthaiah, Sushmita Ruj
No abstract is available for this record.
Nick Curley
Digital assets are changing the way businesses think about equity, labor, business models, and business organization. Digital assets, like Bitcoin or Ethereum, provide incredible opportunities to further align shareholders with the objectives of the entity. Each time humanity advances its technology for ledgers, markets explode, and we witness immense wealth creation. Digital assets like Bitcoin and Ethereum are the next great step forward for ledger technology. While there are incredible opportunities to leverage this new technology, there are also incredible risks. There are many public examples of “hacks” of prominent blockchains like Ethereum and Solana. Blockchain technology has captured the imagination of the public. Blockchain, therefore, must develop a robust security system and intelligently distribute and limit liability for institutional and retail investors to reap the rewards of public attention. Part of the risk that comes from digital assets is its newness. Blockchains that run smart contracts have many incredible uses that could eliminate middlemen in many industries. But courts are yet to develop case law surrounding smart contracts. The way that smart contracts self-execute presents a new question which courts must address: how should a court allocate risk between two smart-contracting parties? No matter how the courts decide, the market needs an answer. This article attempts to explore some of the opportunities in digital assets and how these opportunities are fundamentally different from their traditional equivalents.
Henri Arslanian
No abstract is available for this record.