Bitcoin Users Deanonimization Methods
Bitcoin is the most popular cryptocurrency on the planet. It relies on strong cryptography and peer-to-peer network. Bitcoin is gaining more and more popularity in criminal society. That is why Bitcoin is often used as money laundering tool or payment method for illegal products and services. In this paper we explore various methods for Bitcoin users
deanonimization, which is an important task in anti-money laundering process and cybercrime investigation.
The review discusses the political-economic aspects of the concept of distributed capitalism allowed for by blockchain technology. As opposed to the first era of the Internet, where the industry of financial and information services was dominated by intermediaries, the blockchain era is characterized by development of a new institution of trust; disruption of financial intermediation; economic inclusion of hundreds of millions of citizens in developing countries; an increase in competition and a decrease in inequality. The paper focuses on the content of key political-economic categories being redefined in the blockchain era. First, labor value gives way to creative value which is manifesting itself in cryptocurrencies. Second, exploitation of workers is replaced by digital discrimination. The blockchain revolution is a solution to the problem of discrimination against intellectual property creators, who have to hand over a large part of the value created to intermediaries. Third, capitalism characterized by information monopoly gives place to free competition based on rivalry between cryptocurrencies. Fourth, class struggle is substituted by confrontation between agents of information monopoly system and those of distributed economy. The author considers the main opposition to distributed capitalism to stem from the feudal financial system which loses ground under new conditions, where economic agents may use alternative currencies and interact directly with one other without risk and high transaction costs.
This paper is an overview of Tor network users deanonymization methods. It describes passive and active attacks and theirs key features.
The purpose of this article is to answer a question: сan cryptocurrency take the place of a major world currency? I study this issue because of economic agents tend to apply that currency, which is used by others in a currency сirculation. Therefore, there is a tendency of a transition from the international currency system with a set of шnternational currencies to a system with one major world currency or to a system with a small number of international currencies. The first part of the article determines requirements to the major world currency. The second part of the article studies to what extent cryptocurrency conforms to these requirements. The final part describes the characteristics of cryptocurrency, which will allow it to take the place of the world currency. To analyze economic processes, the author applied the system approach as well as the methods of scientific modeling, comparison, and grouping. The analysis has shown that cryptocurrencies existing now cannot take the place of world currency, as they do not conform to many requirements. But at the same time, cryptocurrency as a world currency has competitive advantages over national world currencies. It is decentralized; therefore, when changing the country-leader, other countries can support it. Moreover, it is not a national currency; therefore, its volume is not connected with monetary policy of any country. These benefits give a prospect to cryptocurrency to become a world currency if in other properties it will be as good as modern international currencies. Therefore, in order that cryptocurrency has taken the place of steady world currency, it has to go under certain changes, which presented in the last part of the paper.
The paper analyzes legal issues associated with Smart contracts, i.e. agreements existing in the form of software code implemented on the Blockchain platform, which ensures autonomy and self-executive nature of Smart contract terms based on predetermined set of factors. Based on cryptocurrency Bitcoin example, the paper outlines peculiarities of Blockchain technology, which is the core of Smart contracts. Then the tensions between classic contract law and Smart contracts are outlined (inapplicability of concepts of “obligation”, “responsibility”, “non-performance or improper performance”, etc.) and certain possible consequences of wide-scale use of Smart contracts in legal practice
Any object or resource can be attacked. Cyberattacks cover identity theft, fraud, and network or system intrusions. Preventing online fraud, identity theft and hacking is especially important when exchanging information in a blockchain.
In the conditions of accelerated globalization and high speed of technological progress, it becomes vitally important for investors, banks and other participants of the financial market to use innovations in their kind of activity to increase profits. Otherwise, they can be defeated before their competitors. In view of the above situation, the author decided to carry out a research paper on the topic "Bitcoin as a breakthrough innovation of the 21st century". The article is devoted to the study of the Crypto-currency as a derivative of the technology from the "Blochane" innovation. The main objective of the study is to define the investment appeal of the crypto currency both in general and in particular - Bitcoin. The subject of the study is Bitcoin, and the object of research is the technology of P2P data exchange. The main method of studying Bitcoin is the historical analysis, on the basis of which the cause-effect relationships affecting the Bitcoin exchange rate to the dollar were searched. Also, a quantum-economic analysis was made showing the state of the subject of research to date. Moreover, it was presented a comparison of the fiat currencies and the first crypto currency. The author also analyzed the dynamics of changes in the level of interest of the population in crypto currency Bitcoin and the dynamics of the change in the rate of Bitcoin to the dollar. Based on the analysis done, the author came to a number of conclusions, the main ones of which are: Bitcoin is a test model of a new concept of electronic money transfer; In the near future it is necessary to expect the emergence of national crypto-currencies; The potential of technology "Blokchayne" can radically change the accounting and tax reporting of legal entities.
A model for organizing cargo transportation between two node stations connected by a railway line which contains a certain number of intermediate stations is considered. The movement of cargo is in one direction. Such a situation may occur, for example, if one of the node stations is located in a region which produce raw material for manufacturing industry located in another region, and there is another node station. The organization of freight traﬃc is performed by means of a number of technologies. These technologies determine the rules for taking on cargo at the initial node station, the rules of interaction between neighboring stations, as well as the rule of distribution of cargo to the ﬁnal node stations. The process of cargo transportation is followed by the set rule of control. For such a model, one must determine possible modes of cargo transportation and describe their properties. This model is described by a ﬁnite-dimensional system of diﬀerential equations with nonlocal linear restrictions. The class of the solution satisfying nonlocal linear restrictions is extremely narrow. It results in the need for the “correct” extension of solutions of a system of diﬀerential equations to a class of quasi-solutions having the distinctive feature of gaps in a countable number of points. It was possible numerically using the Runge–Kutta method of the fourth order to build these quasi-solutions and determine their rate of growth. Let us note that in the technical plan the main complexity consisted in obtaining quasi-solutions satisfying the nonlocal linear restrictions. Furthermore, we investigated the dependence of quasi-solutions and, in particular, sizes of gaps (jumps) of solutions on a number of parameters of the model characterizing a rule of control, technologies for transportation of cargo and intensity of giving of cargo on a node station.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability
The geographic information system (GIS) is based on the first and only Russian Imperial Census of 1897 and the First All-Union Census of the Soviet Union of 1926. The GIS features vector data (shapefiles) of allprovinces of the two states. For the 1897 census, there is information about linguistic, religious, and social estate groups. The part based on the 1926 census features nationality. Both shapefiles include information on gender, rural and urban population. The GIS allows for producing any necessary maps for individual studies of the period which require the administrative boundaries and demographic information.
It is well-known that the class of sets that can be computed by polynomial size circuits is equal to the class of sets that are polynomial time reducible to a sparse set. It is widely believed, but unfortunately up to now unproven, that there are sets in EXPNP, or even in EXP that are not computable by polynomial size circuits and hence are not reducible to a sparse set. In this paper we study this question in a more restricted setting: what is the computational complexity of sparse sets that are selfreducible? It follows from earlier work of Lozano and Torán (in: Mathematical systems theory, 1991) that EXPNP does not have sparse selfreducible hard sets. We define a natural version of selfreduction, tree-selfreducibility, and show that NEXP does not have sparse tree-selfreducible hard sets. We also construct an oracle relative to which all of EXP is reducible to a sparse tree-selfreducible set. These lower bounds are corollaries of more general results about the computational complexity of sparse sets that are selfreducible, and can be interpreted as super-polynomial circuit lower bounds for NEXP.