Physical documents have many challenges, due to being difficult to exchange and the potential of being lost and sabotaged. Digital documents seem to address some of these challenges, but because of the use of the Internet and reliance on third parties to share and preserve such documents, the privacy and integrity of the digital documents became difficult to maintain. The blockchain technology that Satoshi Nakamoto has proposed for financial transactions can be used to solve the problems of trust in centralized systems and the subversion and alteration thatthese transactions may be exposed to. Blockchain-based systems have shown their effectiveness and ability to solve most security problems related to exchanging systems' transactions. Hence,A decentralized system for exchanging digital documents, using Ethereum blockchain and InterPlanetary File System (IPFS), has been proposed to overcome the problems of using trusted third-parties in exchanging digital documents. The proposed system provides immutable and irreversible logs of the process of sending and receiving documents. In this framework, all registered users can encrypt the documents using the Advanced Encryption Standard (AES) Algorithm, send, and receive documents using the Ethereum Blockchain's smart contract. The framework was simulated locally using Ganache Blockchain and tested on the official Ethereum test network Ropsten, and the experimental results showed the feasibility of the proposed scheme. The smart contract used in the Ethereum blockchain was written in the Solidity programming language, and the website that was needed to interact with the blockchain was built using React and other different javascript libraries like web3. Additionally, Metamask wallet was used to create the Ethereum accounts which are required to connect and communicate with the Smart Contract that is implemented in the Ethereum blockchain. Finally, the model's results indicated that the model may cost an average of 0.0552$ per transaction, and this shows that the system is affordable. Also, the model has satisfied the three main security requirements which are confidentiality, integrity, and availability by using the suitable countermeasure for each one of them.
Rapid advancements in digital technologies and their accelerating adoption throughout all sectors of the economy have radically transformed our lives. Stepping through the looking glass of the digital economy and the nascent Web3, this article explores how new forms of tech-enhanced evidence â involving artificial intelligence, blockchain, drone, and extended reality technologies â are emerging. Building upon this backdrop, the article focuses on the influence of these new technologies on the subject of evidence in international arbitration.1 It examines the opportunities and risks presented by these technologies through various use-cases, considering their potential to enhance efficiency, accessibility, fairness, and due process. While recognizing the significance of tech-enhanced arbitration to meet the needs of the 21st century, the article underscores the importance of understanding the benefits and limitations of these technologies. It concludes that, although the technological advancements are essential, the human factor remains pivotal in upholding the fairness and legitimacy of the arbitral system.
${\mathsf Web3.0}$, often cited to drastically shape our lives, is ubiquitous. However, few literatures have discussed the crucial differentiators that separate${\mathsf Web3.0}$from the era we are currently living in. Via a thorough analysis of the recent blockchain infrastructure evolution, we capture a key invariant featuring the evolution, based on which we provide the first academic definition for${\mathsf Web3.0}$. Our definition is not the only way of understanding${\mathsf Web3.0}$, yet, it captures the fundamental and defining trait of${\mathsf Web3.0}$, and meanwhile it is has two desirable properties. Under this definition, we articulate three key categories of infrastructural enablers for${\mathsf Web3.0}$: individual smart-contract capable blockchains, federated or centralized platforms capable of publishing verifiable states, and an interoperability platform to hyperconnect those state publishers to provide a unified and connected computing platform for${\mathsf Web3.0}$applications. While innovations in all categories are necessary to fully enable${\mathsf Web3.0}$, in this article, we present a design for the third enabler, i.e., the first interoperability platform, namely${\mathsf HyperService}$, that advances the state-of-the-art by simultaneously deliversinteroperabilityandprogrammabilityacrossheterogeneousblockchains and state publishers.${\mathsf HyperService}$is powered by two innovative designs:${\mathsf (i)}$a developer-facing programming framework that allows developers to build cross-chain applications in a unified programming model; and${\mathsf (ii)}$a secure blockchain-facing cryptography protocol that provably realizes those applications on blockchains. We implement a prototype of${\mathsf HyperService}$in approximately 62,000 lines of code to demonstrate its practicality, usability and scalability.
Blockchain Technology Applications and Security
Cloud Data Security Solutions
Innovative Microfluidic and Catalytic Techniques Innovation
Jae Song, Eung Seon Kang, Hyeon Woo Shin, Ju Wook Jang
We implement a peer-to-peer (P2P) energy trading system between prosumers and consumers using a smart contract on Ethereum blockchain. The smart contract resides on a blockchain shared by participants and hence guarantees exact execution of trade and keeps immutable transaction records. It removes high cost and overheads needed against hacking or tampering in traditional server-based P2P energy trade systems. The salient features of our implementation include: 1. Dynamic pricing for automatic balancing of total supply and total demand within a microgrid, 2. prevention of double sale, 3. automatic and autonomous operation, 4. experiment on a testbed (Node.js and web3.js API to access Ethereum Virtual Machine on Raspberry Pis with MATLAB interface), and 5. simulation via personas (virtual consumers and prosumers generated from benchmark). Detailed description of our implementation is provided along with state diagrams and core procedures.
Chronic disease exists over a period of time and it is very crucial because it can affect the health of disability people more. Normally people think that they are not suffering or affected by the disease because they do not have symptoms. But it does not necessarily mean a person with no symptom has no chronic disease. This paper presents design and prototype implementation of a blockchain system which remotely monitors patient health records. The patient monitoring system is a big challenge and other security threats arises as the health care data transferred from one to another and authorization to create and read transactions, is a major concern related to data loss. The data loss of the patient protected health information which are generated from the devices should be handled carefully. So in this paper we proposed a solidity based smart contract run over a Ethereum virtual machine to facilitate the secure analysis and storing of transactions from and to the sensors. Using the Ethereum protocol, based on a private blockchain and writing the smart contracts to keep track of the patient health information. We have created an automatic system through which the sensors collects the data, then communicates with the decentralized application via the smart contract. The method inside the smart contract collects data when they are called, also reads and writes transactions of all events on the Ethereum virtual network. This solidity based smart contract system along with injected web3, metamask, and truffle environment would support alert transaction to the patient and medical professionals.
Pierre Schutz, Stanislas Gal, Dimitris Chatzopoulos, Pan Hui
Abstract Peerâtoâpeer (P2P) networks utilize centralized entities (trackers) to assist peers in finding and exchanging information. Although modern P2P protocols are now trackerless and their function relies on distributed hash tables (DHTs), centralized entities are still needed to build file indices (indexing) and assist users in joining DHT swarms (bootstrapping). Although the functionality of these centralized entities are limited, every peer in the network is expected to trust them to function as expected (e.g. to correctly index new files). In this work, a new approach for designing and building decentralized online applications is proposed by introducing DIBDApp. The approach combines blockchain, smart contracts and BitTorrent for building up a combined technology that permits to create decentralized applications that do not require any assistance from centralized entities. DIBDApp is a software library composed of Ethereum smart contracts and an API to the BitTorrent protocol that fully decentralizes indexing, bootstrapping and file storing. DIBDApp enables any peer to seamlessly connect to the designed smart contracts via the Web3J protocol. Extensive experimentation on the Rinkeby Ethereum testnet shows that applications built using the DIBDApp library can perform the same operations as in traditional backâend architectures with a gas cost of a few USD cents.
The aim of this research is to develop some concepts of web3 for the education technology specialist, to present a proposed training program for web3 technology, to define the concepts and technology of web3. There is a statistically significant difference at the level (0.05) between the average scores of education technology specialists in the pre and post applications to test the web3.0 concepts in favor of the post application. In light of the significance of the differences using the "T" tests, the square of ETA (2η) was calculated using the equation Eta square (2 η) to find the magnitude of the effect of the independent variable (training program) in the dependent variable (development of web3.0 concepts), and by calculating the value of the square of ETA (2)) (Al-Amiri, 2006, 233), reached (0.98), which indicates that the training program has a significant impact on the acquisition of some concepts of web3.0, where this value shows that the training program contributed (98%) of the total variance In developing these concepts,It is a large percentage indicating the effectiveness of the training program in developing web3.0 concepts for the target research sample, which is the education technology specialist (if the effect size = 0.2 is the effect is weak, and if the impact size = 0.5, the effect is moderate, and if the impact size is = 0.8 The effect is significant), (Asr, 2003). From the above it is clear that the training program contributed to the development of the targeted web3.0 concepts for education technology specialists, as it found a difference between the median of the pre and post applications to test the concepts of the web3.0 in favor of the post application at the research group, which averaged (51,85) compared to (16) , 75) for pre-application, with a large effect size of (0.98) according to the ETA square measure (2η) of the effect size.
Nowadays, data are generated in a continuous streaming manner as the inputs of various applications. The sources of such generated data can be wired or wireless sensor networks commonly used in various fields of geographical, traffic, Internet of Things (IoT), financial tickers, Web2 and Web3, e-commerce, social networks, and online communities. The high volume, high variety, and high velocity of data have recently posed the challenge of 3Vs to this field, also known as the Big Data Problem. The 3Vs dimensions of complexities for the big data entails high-speed storage, scalability of database systems, suitable data models, real-time responsiveness and so on. Data model, as the representation schema of data is an essential issue since many others (e.g., DBMS systemsâ design, DB languages, etc.) rely on. So, the study of data models is a key and fundamental aspect in structuring, organizing, storing, and manipulating big data. It is also the essence in various areas of cloud migration, web-scale, and so forth. In this paper, we have systematically reviewed different types of data models, the rationale behind them, their applications and support capabilities, and the technologies to switch from one model to another. To address the user needs in various fields, a systematic review method is adopted to classify and present different types and characteristics of data models.
Christian Catalini, Alonso de Gortari, Nihar B. Shah
Stablecoins have the potential to drastically increase competition and innovation in financial services by reducing our reliance on traditional intermediaries. But they also introduce new challenges, as regulators rely on intermediaries to ensure financial stability, market integrity, and consumer protection. Because they operate at the interface between traditional banking and cryptocurrencies, stablecoins also represent an ideal setting for understanding the key trade-offs cryptocurrencies involve, and insights from robust stablecoin design and regulation are highly relevant for related innovations in decentralized finance (DeFi), nonfungible tokens, and Web3 protocols. In this review, we describe the following: key stablecoin design choices, from reserve composition to stability mechanism; legal claim against the issuer; noninterference with macroeconomic stability; and interoperability with public sector payment rails and central bank digital currencies. Last, we cover the key benefits of stablecoins in the context of real-time, low-cost programmable payments, financial inclusion, and DeFi.
We outline the concept of an open technology platform which builds upon a publicly accessible library of fluidic designs, manufacturing processes and experimental characterisation, as well as virtualisation by a âdigital twinâ. Backed by the rapidly emerging Web3 technology âBlockchainâ, we significantly extend traditional approaches to effectively incentivise broader participation by an interdisciplinary âvalue networkâ of diverse players. Ranging from skilled individuals and more established research institutions to companies with their infrastructures, equipment and services, the novel platform approach enables all stakeholders to jointly contribute to value creation along more decentralised supply chain designs. Blockchain-enabled âWisdom of the Crowdsâ and âSkin in the gameâ mechanisms secure âtrustâ and transparency between participants. Prediction markets are created for guiding decision making, planning and allocation of funding; competitive parallelisation of work and its validation from independent participants substantially enhances quality, credibility and speed of project outcomes along the entire path from RTD, fabrication and testing to eventual commercialisation. This novel, Blockchain-backed concept can be led by a corporation, academic entity, a loosely organised group, or even a Decentralised Autonomous Organisation (DAO). The proposed strategy is particularly attractive for highly interdisciplinary fields like Lab-on-a-Chip systems in the context of manifold applications in the Life Sciences. Rather than engaging in all sub-disciplines themselves, many smaller, highly innovative actors can focus on strengthening the product component distinguishing their unique selling point (USP). In this effort, system integrators access underlying commons like fluidic design, manufacture, instrumentation and software from a more resilient and diversified supply chain.
The emergence of digital financial technology, such as blockchain, cryptocurrencies, and decentralized finance (DeFi) has created new opportunities in the field of financial inclusion, although gender differences are still very strong. The research paper examines the acceptance and effects of Web3 financial tools on the economic empowerment of women, the access and use as well as the financial literacy levels of women in the developed and emerging economies. The research design is a mixed-method study that will involve quantitative data based on blockchain transaction data, the use of digital wallets, and financial inclusion indicators, and qualitative data collection based on structured interviews and focus groups with female users and fintech providers. The results show that there are also a great difference in the adoption: women in technologically developed areas are better equipped with access, financial literacy, and institutional support, and women in resource-deprived regions have challenges with limited internet connectivity, lack of digital literacy, and socio-cultural constraints. In spite of such difficulties, Web3 technologies can contribute to making women more financially independent through facilitating inexpensive and safe transactions, decentralized savings, and having access to alternative credit structures. In addition to this, the user interaction also indicates subtle preferences: digitally literate users prefer convenience, transparency, and privacy, whereas the less digitally equipped ones focus on trust, education, and community support. Strategic interventions presented in the paper, such as female-sensitive policy models, specific financial literacy interventions, and onboarding strategies driven by communities, are also suggested to facilitate fair involvement in the Web3 ecosystem. Through the identification of both prospects and obstacles to digital finance that is inclusive of gender, this paper illustrates that Web3 can be used as an empowering opportunity in the economy and financial sustainability. The findings can be added to the increasing body of research on digital finance and presented as evidence-based policies to help policymakers, fintech developers, and advocacy organizations to enhance the gender gap in digital financial technology adoption.
An overwhelming majority of experts has been flagging for decades that âSaving the Planetâ requires immediate, persistent and drastic action to curb a variety of catastrophic risks over the 21st century. However, despite compelling evidence and a range of suggested solutions, transnational coordination of effective measures to protect our biosphere continues to fall short. To remedy, we propose a novel platform for addressing the central issue of affording trust, transparency and truth while minimizing administrative overheads. This will empower an even loosely organised, global grass-roots community to coordinate a large-scale project on a shared goal (âCommonsâ) spanning the digital and real world. The Web3 concept is based on the swiftly emerging âBlockchainâ and related cryptographic, distributed and permissionless technologies. âWisdom of the crowdsâ mechanisms involving competitive parallelisation and prediction markets are enabled by formalised reputation and staking to incentivise high-quality work, fair validation and best management practice. While these mechanisms have been (mostly separately) applied to science, business, governance, web, sensor, information and communication technologies (ICT), our integrative approach around Blockchain-enabled âoperating principles and protocolsâ sets the basis for designing novel forms of potentially crowdfunded Decentralised Autonomous Organisations (DAOs).
A evolucao da tecnologia e cada vez mais rapida e tem impacto direto na sociedade - o modo como as pessoas veem o dinheiro mudou drasticamente e a tecnologia comecou a afetar a economia com o nascimento do Bitcoin, a primeira Criptomoeda do mundo, que foi inicialmente proposta em 2008 e em 2018 inspirou este artigo. Em face ao cenario das Criptomoedas, este trabalho tem por objetivo desenvolver um prototipo de aplicacao de Crowdfunding, fazendo uso da Blockchain e que possa ser capaz de processar Smart Contracts dentro da Ethereum Network, a fim de demonstrar a efetividade da aplicacao de metodos, tecnicas e ferramentas adequadas a esse contexto moderno de tecnologia. Para o desenvolvimento da solucao, foi admitida a Criptomoeda Ethereum, totalmente digital e descentralizada. Fazendo uso de uma API disponibilizada pela Ethereum, a web3, foi possivel escrever as transacoes na Blockchain e, para uma interface amigavel, foi utilizada a biblioteca React.js. Em paralelo, para viabilizar a escrita dos contratos, foi utilizada a linguagem Solidity, baseada em Javascript. Como resultado do trabalho, obteve-se um sistema eletronico de transacao descentralizado que nao necessita de um intermediario, que conta com assinaturas digitais que permitem forte controle sobre propriedade prevencao de gasto duplo, tudo isso por meio de uma rede peer-to-peer que utiliza prova de trabalho para criar um registro publico, que e impraticavel para fraudadores modificarem. Portanto, o artigo oferece uma visao atual sobre aplicacoes envolvendo Criptomoedas e mostra o quao eficazes sao essas solucoes modernas referentes a transacoes de capital.
Smart contracts can be considered as a way to automate some of the conditions and obligations described in the contract. In this chapter, we cover the smart contract programming with a special emphasis on Solidity, properties associated with a smart contract account, fetching accounts from Ganache module, deployment of smart contracts with Web3 and Infura, testing smart contracts with open-source tools such as Remix and Mocha framework for asynchronous testing, test coverage reports, and use of any assertion library. Hence, this chapter highlights methods for writing smart contracts using various authoring tools. There are multiple smart contract authoring tools including Visual Studio. However, the easiest and fastest way for developing and testing the smart contracts is to use a browser-based tool known as Remix. Next, we start writing few smart contract applications with Solidity language and explaining all the common function types used in it. The concepts of gas and transactions are thoroughly discussed. Lastly, this chapter is laid out in a manner that it helps the reader to get the comprehensive idea of writing smart contracts.
Smart contracts are programs, which are stored in a decentralized network i.e. Block chain. These are written by users to develop decentralized applications using different platform like Ethereum and bitcoin. In current scenario, even though blockchain support features like security and transparency. Because of solidity language vulnerability, there is a possibility of attacks on smart contracts in blockchain. So, to avoid those attacks like i.e. Locked Ether, Transaction order dependency and Time stamp dependency. We discussed, analyzed and tested these attacks in this paper. Further, in our project supply chain management for textile industry using block chain technology, we have developed smart contract using solidity language on Ethereum Platform. With the aim of protecting our project from these attacks, we are thoroughly and experimentally analyzed. And based on the experimental observations, we are going to protect our project from these attacks. All the above mentioned attacks are thoroughly studied and experimentally tested on Ganache, Ropston test network, Rinkeby test network using Remix IDE in JVM, injectedweb3and web3 provider environments. Finally, we have suggested security measures to protect from these attacks
Conventional certificate verification, whether paper-based or backed by a centralized digital registry, remains exposed to forgery, single points of failure, and slow manual cross-checking between issuers, holders, and verifiers. This paper presents a decentralized, blockchain-based framework for issuing, storing, and verifying academic and professional certificates that addresses these weaknesses without placing the full document on-chain. Each certificate is reduced to a SHA-256 hash, signed with the issuing institution's RSA private key, and recorded through an Ethereum smart contract, while the original file is retained off-chain on IPFS and referenced by its Content Identifier. Only institutions that pass a unanimous, vote-based onboarding process administered by a validator consortium are permitted to issue certificates, which constrains the system to a trusted-issuer model while preserving decentralization across the validator set. A hash-mapped Bloom Filter sits in front of the blockchain query path and performs a fast probabilistic existence check, allowing forged or non-existent certificates to be rejected before an on-chain lookup is triggered. A prototype was implemented with Solidity smart contracts on the Ethereum Sepolia testnet, a Node.js/Web3.js application layer, and a React.js frontend with MetaMask-based authentication. Evaluation on the testnet shows that the Bloom Filter pre-check lowers the average lookup time for invalid certificates by roughly 87%, keeps verification of valid certificates under two seconds end-to-end, holds the false-positive rate below 0.5% for up to 50,000 stored certificate hashes, and reduces the gas cost of issuing a certificate to approximately 4.57 USD. These results indicate that combining consortium governance, cryptographic hashing, and probabilistic filtering yields a certificate validation pipeline that is simultaneously tamper-resistant, low-cost, and fast enough for real-time institutional use.
Yan Zhuang, Yin-Wu Chen, ZonâYin Shae, ChiâRen Shyu
BACKGROUND: Data coordination across multiple health care facilities has become increasingly important for many emerging health care applications. Distrust has been recognized as a key barrier to the success of such applications. Leveraging blockchain technology could provide potential solutions tobuild trust between data providers and receivers by taking advantage of blockchain properties such as security, immutability, anonymity, decentralization, and smart contracts. Many health technologies have empirically proven that blockchain designs fit well with the needs of health care applications with certain degrees of success. However, there is a lack of robust architecture to provide a practical framework for developers to implement applications and test the performance of stability, efficiency, and scalability using standard blockchain designs. A generalized blockchain model is needed for the health care community to adopt blockchain technology and develop applications in a timely fashion. OBJECTIVE: This study aimed at building a generalized blockchain architecture that provides data coordination functions, including data requests, permission granting, data exchange, and usage tracking, for a wide spectrum of health care application developments. METHODS: An augmented, 3-layered blockchain architecture was built on a private blockchain network. The 3 layers, from bottom to top, are as follows: (1) incorporation of fundamental blockchain settings and smart contract design for data collection; (2) interactions between the blockchain and health care application development environment using Node.js and web3.js; and (3) a flexible development platform that supports web technologies such as HTML, https, and various programing languages. Two example applications, health information exchange (HIE) and clinical trial recruitment, were developed in our design to demonstrate the feasibility of the layered architecture. Case studies were conducted to test the performance in terms of stability, efficiency, and scalability of the blockchain system. RESULTS: A total of 331,142 simulated HIE requests from accounts of 40,000 patients were successfully validated through this layered blockchain architecture with an average exchange time of 11.271 (SD 2.208) seconds. We also simulated a clinical trial recruitment scenario with the same set of patients and various recruitment criteria to match potential subjects using the same architecture. Potential subjects successfully received the clinical trial recruitment information and granted permission to the trial sponsors to access their health records with an average time of 3.07 seconds. CONCLUSIONS: This study proposes a generalized layered blockchain architecture that offers health technology community blockchain features for application development without requiring developers to have extensive experience with blockchain technology. The case studies tested the performance of our design and empirically proved the feasibility of the architecture in 2 relevant health application domains.
Nasir D. Khan, Chrysostomos Chrysostomou, Babar Nazir
Electronic First Information Report (e-FIR) is a basic document filed to the police stations by a victim or someone on his/her behalf when a cognizable offense such as murder, kidnapping, rape, theft, etc. is committed. In the e-FIR database, the offense's record can be compromised due to its centralized nature, and further the intentional registration of false e-FIR can occur. Thus, data integrity and transparency are key concerns in e-FIR database. In this paper, e-FIR data integrity and false registration appended with police stations in a centralized database are addressed via a consensus-based distributed blockchain solution, as an integral part of a smart city environment. Specifically, a smart contract based intelligent framework has been utilized to explore the potential of Ethereum blockchain in providing integrity to e-FIR data stored in a police station's database. Local database is interfaced with Ethereum blockchain using Web3 Remote Procedure Call (RPC) protocol. Multiple simulations have been performed to evaluate the performance of the proposed framework. Our results show a trade-off between different hashing algorithm security level for the offenses data and number of transactions stored in a single block on blockchain ledger.
Blockchain Technology Applications and Security
Advanced Steganography and Watermarking Techniques