Purposely modular, this protocol enables customization of several protocol properties, including the consensus properties implemented, blockchain type, the roots used, and virtual machine opcodes, among others. These modules enable implementing parties to control the behavior of their economy, with a minimal amount of effort, and no sacrifice in participant cryptoeconomic quality. This work also demonstrates the simplification of the developer experience by abstracting away all technological details, except basic CRUD-based operations, using various programming languages. We demonstrate the mechanism design approach taken, and formalize a process for deploying populations of blockchain economies at scale. The framework shown includes adequate tooling for simulation, development, deployment, maintenance, and analytic-based decision making. Lastly, we introduce an expressive programming language for the purpose of creating, and interacting with the cryptoeconomy designed by the implementing developer.
The research objective of the article: The aim of the paper is to present the challenges and opportunities of Initial Coin Offering (ICO) procedure (sometimes appearing in literature and official documents as the Initial Token Offering (ITO)) from the point of view of a company as well as verify the hypothesis about ICO as a cheap form of capital rising that is often presented in websites dedicated to ICO. There are enumerated the differences and similarities to the Initial Public Offering and possible advantages over other methods of capital rising. The paper points out the most important barriers to the use of ICO. The research method applied: As there is shortage of available research papers and literature related to the topic that are focused on financial aspects such as comparison between ICO and other methods of capital rising, there was conducted the analysis of reliable internet sources and a case study method of Ethereum – the first company that applied the Initial Coin Offering procedure. The mentioned research method has its limits, as it is necessary to verify received information. That is the reason why only professional websites dedicated to the topic were used. The outcome of the research (considerations, analyses), main conclusion(s): the Initial Coin Offering procedure is recognised as a very controversial topic. It is clearly visible that ICO has many advantages over traditional forms of rising capital for the company, but, so far, ambiguous legal status, cost level and high risk of scams and other possible abuses make it difficult to become widely applied by newly created companies.
The article presents an econometric analysis of the effect of stock indicators, such as Comex Gold futures, Dow Jones Industrial Average index and NASDAQ Composite, on the Ethereum cryptocurrency dynamics in the 100-day period. As part of the study, an econometric model of the dynamics of e-currency was built. The survey results show that when the Comex gold futures price changes by 1% on average, the Ethereum price changes by 5.01% in the same direction, when the Dow Jones Industrial Average index changes by 1%, the Ethereum price is 10.897%, and when the NASDAQ Composite index changes, the Ethereum price will change in the opposite direction to 3.59%
Blockchain is defined as a distributed ledger technology that can implement financial models. An improved blockchain provides a democratic virtual economic system (DVES) that can verify payments, reach consensus, and store encrypted data in virtual economic systems. In this paper, we review the latest progress and possibilities in improved blockchain with respect to openness, data security, and scalability. This paper outlines the challenges of value, existence, and status (VES) and the state-of-the-art solutions for improved blockchain. Then, this paper discusses the VES in terms of distributed energy, ownership certification, infrastructure, and other fields. More importantly, it analyzed the importance of scale out, which can be a key enabler to solve the main practical problems in constructing DVES.
Bitcoin was the first digital currency to rely on a decentralized peer-to-peer network instead of a trusted third party. This was achieved through Bitcoin’s revolutionary underlying technology based on cryptographic proof: the blockchain. After Bitcoin’s emergence, many other so called cryptocurrencies entered the market and we have seen enormous price increases that romised large returns for early users. The return characteristics of cryptocurrencies have been studied by various scholars and some have even declared cryptocurrencies to be an asset class instead of a digital currency. Due to the fast changes in the cryptocurrency market and the increased importance of other cryptocurrencies than Bitcoin, we believe that research focusing on the financial performance of cryptocurrencies should be renewed on a regular basis. Therefore, with this work we aim to shed light on the return characteristics of cryptocurrencies in relation to traditional asset classes and on the potential of cryptocurrencies to improve portfolio diversification. In addition, we investigate the cryptocurrency market, describe selected cryptocurrencies in more detail and provide an overview of potential technological risks arising with the use of cryptocurrencies. Our results indicate that cryptocurrencies provide large return potentials with high levels of volatility but compared to traditional asset classes provide a higher level of return per level of risk. We also find that selected cryptocurrencies can improve diversification in a cryptocurrency portfolio, as well as in a portfolio of international equity and private equity investments. Keywords: Alternative Asset Classes, Cryptocurrency, Portfolio Diversification, Risk-Reward Profile und Cryptocurrency Risks
Lanny Z. N. Yuan, Huaibing Jian, Peng Liu, Pengxin Zhu · 5 authors
In this white paper, we propose a blockchain-based system, named AME, which is a decentralized infrastructure and application platform with enhanced security and self-management properties. The AME blockchain technology aims to increase the transaction throughput by adopting various optimizations in network transport and storage layers, and to enhance smart contracts with AI algorithm support. We introduce all major technologies adopted in our system, including blockchain, distributed storage, P2P network, service application framework, and data encryption. To properly provide a cohesive, concise, yet comprehensive introduction to the AME system, we mainly focus on describing the unique definitions and features that guide the system implementation.
Intelligent Cyber-physical systems can be modelled as multi-agent systems\nwith planning capability to impart adaptivity for changing contexts. In such\nmulti-agent systems, the protocol for plan execution must result in the proper\ncompletion and ordering of actions in spite of their distributed execution.\nHowever, in untrusted scenarios, there is a possibility of agents not\nrespecting the protocol either due to faults or due to malicious reasons\nthereby resulting in plan failure. In order to prevent such situations, we\npropose to implement the execution of agents through smart contracts. This\npoints to a generic architecture seamlessly integrating intelligent\nplanning-based CPS and smart-contracts.\n
The article presents the analysis and evaluation of the essence of bitcoin (and other cryptocurrencies) from the perspective of its (their) adaptability to the Muslim concept of money. From an economic point of view in the so-called Western culture, all the classical functions of money cannot be fully attributed to bitcoin. Although it performs the function of an exchange medium and the means of payment, it does not fulfil the role of a value storing instrument and thus proves to be a defective measure of value. In the Islamic world, the perception of bitcoin as money is a more complex problem because its economic presentation overlaps with religious issues. Such relationship results in a situation when the answer to the question: can bitcoin be approached as money, is formulated on the basis of a subjective interpretation of the Sharia law, which is also ambiguous.
Trust issue gradually becomes more of a concern in the 21st century business environment. Recent research sheds light on the erosion of trust to brands on a global basis. Traditionally, trusted third parties take place to ensure the trust needed for business transactions to take place. Digitization, advances in peer-to-peer networks and cryptographic technologies have advanced to such a point that exchange of currency, as in the case of Bitcoin, and even value as in the case of property rights, securities, ownership etc. can be done over Internet with Blockchain technology serving as a trust layer baked into the protocol. Blockchain technology serves as the missing trust layer in the evolution of Internet. This paper explores implications of Blockchain technology on marketing discipline from various aspects. The paper pinpoints the key strategies marketers need to adopt to survive in the rapidly evolving business landscape. Finally, conclusions are drawn regarding future direction of marketing as affected by those technological advances.
We present SOLAR, a new analysis tool for automatically detecting standard violation errors in Ethereum smart contracts.Given the Ethereum Virtual Machine (EVM) bytecode of a smart contract and a user specified constraint or invariant derived from a technical standard such as ERC-20,SOLAR symbolically executes the contract, explores all possible execution paths, and checks whether it is possible to initiate a sequence of malicious transactions to violate the specified constraint or invariant. Our experimental results highlight the effectiveness of SOLAR in finding new errors in smart con-tracts. Out of the evaluated 779 ERC-20 and 310 ERC-721smart contracts, SOLAR found 255 standard violation errors in 197 vulnerable contracts with only three false positives.237 out of the 255 errors are zero-day errors that are not re-ported before. Our results sound the alarm on the prevalence of standard violation errors in critical smart contracts that manipulate publicly traded digital assets
Davy Preuveneers, Vera Rimmer, Ilias Tsingenopoulos, Jan Spooren · 6 authors
The adoption of machine learning and deep learning is on the rise in the cybersecurity domain where these AI methods help strengthen traditional system monitoring and threat detection solutions. However, adversaries too are becoming more effective in concealing malicious behavior amongst large amounts of benign behavior data. To address the increasing time-to-detection of these stealthy attacks, interconnected and federated learning systems can improve the detection of malicious behavior by joining forces and pooling together monitoring data. The major challenge that we address in this work is that in a federated learning setup, an adversary has many more opportunities to poison one of the local machine learning models with malicious training samples, thereby influencing the outcome of the federated learning and evading detection. We present a solution where contributing parties in federated learning can be held accountable and have their model updates audited. We describe a permissioned blockchain-based federated learning method where incremental updates to an anomaly detection machine learning model are chained together on the distributed ledger. By integrating federated learning with blockchain technology, our solution supports the auditing of machine learning models without the necessity to centralize the training data. Experiments with a realistic intrusion detection use case and an autoencoder for anomaly detection illustrate that the increased complexity caused by blockchain technology has a limited performance impact on the federated learning, varying between 5 and 15%, while providing full transparency over the distributed training process of the neural network. Furthermore, our blockchain-based federated learning solution can be generalized and applied to more sophisticated neural network architectures and other use cases.
Muhammad Salek Ali, Massimo Vecchio, Miguel Pincheira, Koustabh Dolui · 6 authors
The blockchain technology has revolutionized the digital currency space with the pioneering cryptocurrency platform named Bitcoin. From an abstract perspective, a blockchain is a distributed ledger capable of maintaining an immutable log of transactions happening in a network. In recent years, this technology has attracted significant scientific interest in research areas beyond the financial sector, one of them being the Internet of Things (IoT). In this context, the blockchain is seen as the missing link toward building a truly decentralized, trustless, and secure environment for the IoT and, in this survey, we aim to shape a coherent and comprehensive picture of the current state-of-the-art efforts in this direction. We start with fundamental working principles of blockchains and how blockchain-based systems achieve the characteristics of decentralization, security, and auditability. From there, we build our narrative on the challenges posed by the current centralized IoT models, followed by recent advances made both in industry and research to solve these challenges and effectively use blockchains to provide a decentralized, secure medium for the IoT.
The subject matter of the article is the substantiation of the problems and perspectives of the introduction of Distributed Ledger Technologies (DLT) / Blockchain in the public and private sectors as a modern digital economy instrument. The goal of the work is to substantiate the scientific and methodical principles of implementing the technologies of distributed DLT / Blockchain registers. The following tasks were solved in the article: the notion of Distributed Ledger Technologies (DLT) and Blockchain is defined; types of Distributed DLT Registries are presented in the form of a classification with a distinction of features and possibilities of application of each type; the general scheme of work is described and the specific features of the Blockchain technology are systematized;the features and directions of the use of intelligent contracts (smart contracts) based on the technology of blockchain are singled out;the international experience of government initiatives and pilot projects of the blockade technology application has been analyzed; the analysis of the domestic experience of practical application of Blockchain technologies in the public and private sectors and the perspective areas for the future application of technologies of the distributed DLT registries are identified; according to the international analytical agencies research results, the obstacles of the Blockchain technologies implementation in the public and private sectors are systematized. The following methods are used: abstract-logical analysis, theoretical generalization, system and statistical analysis. The following results were obtained. The concept of technologies of distributed DLT / Blockchain registries is disclosed. The availability of the system is based on open, private and federal DLTs. The specific features of DLT / Blockchain distributed registry technologies include centralization, involvement of a large number of participants to achieve consensus, use of cryptography and digital signatures, almost impossible to change chronological records, the convenience of tracking and verifying information, and the ability to program. The international experience of using Blockchain technology in countries such as the Great Britain, Georgia, Estonia, the USA, the United Arab Emirates, Italy has been researched. Examples of practical implementation of DLT / Blockchain registry technology in Ukraine are considered. The main obstacles to implementing distributed DLT / Blockchain registries in the public sector are regulatory restrictions and technology immaturity. The obstacles to the introduction of block technologies in the private sector are identified. Conclusions: It is proved that the distributed DLT registry technology has a significant potential for development for the future digital economy. Nevertheless, there are a number of barriers to their full use in the public and private sector, which requires further study by experts.
This, together with the related term Bitcoin, was a revolution in blockchain as envisioned by the mystery character Satoshi Nakamoto up to 2008. All this changes the very way the foundations of digital exchange and storage were thought about: decentralized, transparent, immutable, the very fundamentals of Distributed Ledger Technology enabling safe data exchange without an intermediary. The blockchain is fundamentally a chain of blocks carrying information about transactions, including times and cryptographic hashes, each of these connecting to the previous one in one unbroken chain, for which no modification is viable. The whole design of Blockchain has been to solve a number of issues, including double spending, fraud, and inefficient records, with distributed nodes and consensus mechanisms such as Proof of Work and Proof of Stake, facilitated by cryptographic keys. Other areas beyond cryptocurrency where quite a number of innovative uses are cut across include supply chain, healthcare, financial, and real estate sectors. For example, while the supply chain process is being promoted to become effective and transparent in order to ensure the origin and quality of the product, adding to the guarantee that the user's personal health information will not be accessed and tampered with, blockchain uses smart contracts in automating agreement processes within the contract. All of them are expecting cost reduction, operating efficiencies enhancement, enhanced securities of many industries. Anyhow, there exist quite a number of serious obstacles standing in the way of the wide application of blockchain technology. Firstly, the problem of scalability has still been an issue whereby the network performance tends to be problematic when users are increased. Besides, energy wasting cannot be ignored-apparently mostly a challenge from the PoW kind of system proved to be consuming too much energy, standing big on the road to sustainability. Of course, the mere lack of any kind of international rules and standards is already a complication in making them work. It also underlines failures in the adoption of the system or in decentralizing and is still an open technical and organizational challenge on how to combine blockchain with traditional structures. Their solutions require compounding ideas: sharding of blockchain to make it big, off-chain solutions for the blockchain to be many but thin, and provision of amicable solution consensus mechanisms for environmental conservation. Besides coherent policy vision, in addition to the existing cornerstones of regulation besides well-laid-out standards of interoperability, it is important to create confidence and give a road map across different industries. This paper hereby conceptually reviews the literature with respect to how the blockchain technology was designed to show revolutionary capability in the different fields and what keeps on tormenting it with its future.KEYS: Blockchain technology; Distributed Ledger; Decentralization; Cryptographic keys; Consensus mechanisms; Proof of Work; Proof of Stake; Smart contracts; Supply chain management; Data immutability; Transparency; Scalability; Energy consumption; Challenges to regulatory bodies; Security vulnerability; Sharding; off- chain processing; Interoperability; Applications using blockchain; Architecture of blockchain.
Blockchain technology has gained significant prominence in recent years due to its public, distributed, and decentration characteristics, which was widely applied in all walks of life requiring distributed trustless consensus. However, the most cryptographic protocols used in the current blockchain networks are susceptible to the quantum attack with rapid development of a sufficiently large quantum computer. In this paper, we first give an overview of the vulnerabilities of the modern blockchain networks to a quantum adversary and some potential post-quantum mitigation methods. Then, a new lattice-based signature scheme has been proposed, which can be used to secure the blockchain network over existing classical channels. Meanwhile, the public and private keys are generated by the Bonsai Trees technology withRandBasisalgorithm from the root keys, which not only ensure the randomness, but also construct the lightweight nondeterministic wallets. Then, the proposed scheme can be proved secure in random oracle model, and it is also more efficient than similar literatures. In addition, we also give the detailed description of the post-quantum blockchain transaction. Furthermore, this work can help to enrich the research on the future post-quantum blockchain (PQB).
Rafael Ziolkowski, Gianluca Miscione, Gerhard Schwabe
The blockchain technology challenges the view on established modes of governance by offering distributed authentication without the need for a central authority, which is well-exemplified by Bitcoin. While the governance of and through Bitcoin is well- accentuated in research, we spotlight impacts on governance which blockchain-based systems bring to inter-organizational settings as well as their purpose. To build our arguments, we explore those impacts on two contrasting cases from the domains of automotive and public administration and relate them to cryptocurrencies. Relying on interviews with experts from said organizations utilizing blockchain technology, and a content analysis of related grey literature, we discuss established forms of governance as well as platforms and infrastructures against the impacts which blockchain-based systems cause. After referring those to the concepts of markets, hierarchies, networks, and tribes, we critically reflect on their purpose by utilizing the notions of infrastructures and platforms, and conclude blockchain-based systems to possibly alter the way established modes of governance are enacted.
ResumenLa tesis que se defiende en este trabajo es que el complejo modelo institucional y territorial vasco funciona aceptablemente bien, a pesar de sus luces y sombras, y puede ser un ejemplo de la idea ampliamente generalizada de cómo un modelo de organización territorial descentralizada (y sus complejas, pero al mismo tiempo, valiosas formas de interacción entre los distintos niveles de gobierno), pueden mejorar la calidad del gobierno de sus instituciones, ayudar en el desarrollo humano, económico y social, aumentar la transparencia, administrar los recursos disponibles para ofrecer mejores servicios públicos y, en definitiva, mejorar la calidad democrática de la sociedad.Summary1. Introduction. 2. The distribution of competences between the Common Institutions of the Autonomous Community of Euskadi and the Regional Administrative Bodies of the Historical Territories ofBizkaia, Gipuzkoa and Álava. 2.1. The distribution of competences in the Statute of Autonomy of the Basque Country. 2.2. The distribution of competences in the Law of Historical Territories. 3. The competences of the municipal institutions of Euskadi. 4. Conclusion.AbstractThe thesis defended in this paper is that the complex Basque institutional and territorial model works acceptably well, despite its lights and shadows, and can be an example of the widespread idea of how a model of decentralized territorial organization (and their complex, but at the same time valuable forms of interaction between the various levels of government), can enhance the quality of government of their institutions, help in the human, economic and social development, raise transparency and manage available resources to deliver better public services and, in short, improve the democratic quality of society.
Zhao Cai, Fei Liu, Eric T.K. Lim, Chee‐Wee Tan · 5 authors
Although cryptocurrencies have garnered enormous public attention in recent times, extensive fluctuations in their prices have deterred prospective investors. Due to the \n absence of a centralized valuation authority, the credibility of cryptocurrencies as a viable investment vehicle remains elusive. Building on attention theory, this study posits that prospective investors of cryptocurrencies are likely to search online for information before deciding whether to make a commitment. We hence investigate the effects of Google search on the return and risk of 268 cryptocurrencies over 181 trading days. \n Results indicate that the Google Search Volume Index (SVI) of a given cryptocurrency \n exerts significant and positive impact on its price and turnover.
Concurrency, the art of doing many things at the same time is slowly becoming a science. It is very difficult to master, yet it arises all over modern computing systems, both when the communication medium is shared memory and when it is by message passing. Concurrent programming is hard because it requires to cope with many possible, unpredictable behaviors of communicating processes interacting with each other. Right from the start in the 1960s, the main way of dealing with concurrency has been by reduction to sequential reasoning. We trace this history, and illustrate it through several examples, from early ideas based on mutual exclusion, passing through consensus and concurrent objects, until today ledgers and blockchains. We conclude with a discussion on the limits that this approach encounters, related to fault-tolerance, performance, and inherently concurrent problems.
Michael Rodler, Wenting Li, Ghassan Karame, Lucas Davi
Recently, a number of existing blockchain systems have witnessed major bugs and vulnerabilities within smart contracts. Although the literature features a number of proposals for securing smart contracts, these proposals mostly focus on proving the correctness or absence of a certain type of vulnerability within a contract, but cannot protect deployed (legacy) contracts from being exploited. In this paper, we address this problem in the context of re-entrancy exploits and propose a novel smart contract security technology, dubbed Sereum (Secure Ethereum), which protects existing, deployed contracts against re-entrancy attacks in a backwards compatible way based on run-time monitoring and validation. Sereum does neither require any modification nor any semantic knowledge of existing contracts. By means of implementation and evaluation using the Ethereum blockchain, we show that Sereum covers the actual execution flow of a smart contract to accurately detect and prevent attacks with a false positive rate as small as 0.06% and with negligible run-time overhead. As a by-product, we develop three advanced re-entrancy attacks to demonstrate the limitations of existing offline vulnerability analysis tools.
We propose a secure computation solution for blockchain networks. The correctness of computation is verifiable even under malicious majority condition using information-theoretic Message Authentication Code (MAC), and the privacy is preserved using Secret-Sharing. With state-of-the-art multiparty computation protocol and a layer2 solution, our privacy-preserving computation guarantees data security on blockchain, cryptographically, while reducing the heavy-lifting computation job to a few nodes. This breakthrough has several implications on the future of decentralized networks. First, secure computation can be used to support Private Smart Contracts, where consensus is reached without exposing the information in the public contract. Second, it enables data to be shared and used in trustless network, without disclosing the raw data during data-at-use, where data ownership and data usage is safely separated. Last but not least, computation and verification processes are separated, which can be perceived as computational sharding, this effectively makes the transaction processing speed linear to the number of participating nodes. Our objective is to deploy our secure computation network as an layer2 solution to any blockchain system. Smart Contracts\cite{smartcontract} will be used as bridge to link the blockchain and computation networks. Additionally, they will be used as verifier to ensure that outsourced computation is completed correctly. In order to achieve this, we first develop a general MPC network with advanced features, such as: 1) Secure Computation, 2) Off-chain Computation, 3) Verifiable Computation, and 4)Support dApps' needs like privacy-preserving data exchange.
Blockchain has been widely adopted in the last few years even though it is in its infancy. The first well-known application built on blockchain technology was Bitcoin, which is a decentralized and distributed ledger to record crypto-currency transactions. All of the transactions in Bitcoin are anonymously transferred and validated by participants in the network. Bitcoin protocol and its operations are so reliable that technologists have been inspired to enhance blockchain technologies and deploy it outside of the crypto-currency world. The demand for private and non-crypto-currency solutions have surged among consortiums because of the security and fault tolerant features of blockchain. To introduce blockchain concepts, we survey the three most popular blockchain architectures: Bitcoin, Ethereum, and Hyperledger Fabric. We then build Gradubique, a blockchain network built on top of Hyperledger Fabric. Gradubique allows instructors from any school to post exam and course grades to the Gradubique network. Employers and graduate schools can extract transcripts from Gradubique. Security is guaranteed by the blockchain technology. Standardization and translation of transcripts can be built into the network, and the distributed nature of the network can make it virtually cost-free.
Cryptocurrencies are defined as a digital currency in which encryption techniques are utilized to regulate generation of units of currency and verify the transfer of funds, independent of a central governing body such as a bank. Due to the large number of cryptocurrencies currently available, there inherently exists many price discrepancies due to market inefficiencies. Market inefficiencies occur when the price of assets do not reflect their true value. In fact, these types of pricing discrepancies exist in other financial markets, including fiat currency exchanges and stock exchanges. However, these discrepancies are more significant in the cryptocurrency domain due to the low levels of government regulation, higher amounts of speculation, and human behaviors driven by investors seeking profit. These types of pricing discrepancies can be eliminated to some extent by executing arbitrages, which are defined as a sequences of trades beginning and ending with the same asset which result in more of that asset at the end of the trading sequence. Through executing arbitrages, the market should become more efficient. This project was an attempt to execute intra-exchange arbitrage on the well- known cryptocurrency exchange Binance and generate profit, and as a side effect make the cryptocurrency exchange market more fluid. Although the project did not record phenomenal profits, it did successfully generate several hundred dollars over the course of several months, independent of market fluctuations.