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Cryptocurrency Wallets
Mařík, Tomáš ; Budík, Jan (referee) ; Luhan, Jan (advisor)
The aim of the thesis is to assess investment and technological potential cryptocurrencies on the basis of their technical, economic and legal analysis. The work deals cryptocurrencies, analysis and wallet selection.
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Modern applications of zero-knowledge protocols
Krňák, Tomáš ; Hubáček, Pavel (advisor) ; Mareš, Martin (referee)
zk-SNARK is a cryptographic protocol, which enables transformation of an arbitrary computation into short effectively verifiable argument of correctness of this computation. Further more, it enables a prover to decide exactly, which inputs of the computation will be public and which inputs will stay private. The goal of this work is to present features, construction and applications of modern zk-SNARKs. In a construction part of this work we describe construction based on linear PCP and Paillier cryptosystem. In an application part we explain principles of anonymous cryptocurrency Zcash and we describe a completely new application of zk-SNARKs in networks of trust. 1
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Cryptographic currency Bitcoin
ALEŠ, Petr
The bachelor thesis deals with cryptographic currency Bitcoin. It describes the origin, development and current state of the currency. It also outlines the basic principles on which the currency works from a technical standpoint and examines the main advantages and disadvantages of the system compared to the classical currencies. The practical part discusses the issue of security and anonymity in the system. The questionnaire identifies the current state of Bitcon awareness and what features are considered to be the greatest disadvantages from a user perspective. This is followed by an analysis of potential system security intrusions, along with an analysis of several actually performed successful attacks.
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European regulation of virtual currencies, its shortcomings and future development.
Fišer, Jan ; Vondráčková, Aneta (advisor) ; Kunertová, Tereza (referee)
European regulation of virtual currencies, its shortcomings and future development Abstract This thesis is focused on the European regulation of virtual currencies, meaning the current Union legal regulation of this phenomenon including further European Union institutions' activities in the area. The aim of the thesis is to introduce the existing approach towards virtual currencies as well as to find some of the shortcomings and to outline the future development of European regulation of virtual currencies. As a part of this thesis, relevant activities associated with distributed ledger technology as a technology related to virtual currencies will be introduced. To achieve the mentioned, the thesis analyzes mainly legislative and non-legislative sources issued by competent institutions of the European Union, equally important are the jurisprudential texts from the area of virtual currencies and related fields. The thesis is divided into five chapters which are further divided into topical subchapters. Each of the chapters includes partial identification of shortcomings and presents the future development in the area. The introductory chapter addresses the introduction of virtual currencies as such and in the context of financial law. Further, technological bases of virtual currencies are described, namely...
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Cryptocurrencies: Threats and Investigative Opportunities for Law Enforcement
Gonzalez, Eva ; Střítecký, Vít (advisor) ; Karásek, Tomáš (referee)
Cryptocurrencies have developed and widely spread within recent years. Their anonymous and decentralised characteristics have attracted criminals who leverage these technologies to sell and purchase illicit goods on the black market while concealing their identities and avoid prosecution. The new development of cryptocurrencies and their underlying architecture blockchain has had positive and negative effects on the success of law enforcement investigations. It is perceived as a threat when there are factors that increase the complexity of law enforcement investigations due to the use of highly anonymous cryptocurrencies and Bitcoin mixers. Cryptocurrencies are also perceived as a threat when criminals use them for money laundering purposes. Conversely, the rise of cryptocurrencies also introduces new opportunities for law enforcement investigations. Records of cryptocurrency transactions in the blockchain help law enforcement to trace suspicious addresses by the emergence and improvement of analysis tools. In parallel, anti- money laundering (AML) regulations and the financial authorities have proved to play a key role in fighting against money laundering and gather information on suspicious activities carried out through financial institutions. The analysis of this dissertation sets forth that...
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Blockchain at the European Level
Drašković, Teodora ; Kunertová, Tereza (advisor) ; Vondráčková, Aneta (referee)
Blockchain at the European Level Abstract The objective of this master thesis is to provide a basic overview of the blockchain technology, its features and its potential utilization, including an overview of European legal regulations that might be applicable to the technology, under certain conditions. In the first chapter, the master's thesis sets forth the legal framework of the EU primary law that establishes or can establish the EU's competence to act in the matters of blockchain technology, depending on its legal qualification (especially in the context of the internal market - namely the free movement of services and capital). The second and third chapters provide essential description of features of blockchain and cryptocurrency and related services. A more detailed description is provided in Annexes I-IV of this thesis. Further, the legal status and applicable regulation of cryptocurrencies are assessed at the European and national levels and in terms of other global jurisdictions. The assessment also includes the recent CJEU's judgment in the case Hedqvist, according to which bidirectional exchange services (purchase of cryptocurrency for fiat currency and vice versa) are to be exempted from VAT obligation under the VAT directive. In line with the CJEU's reasoning and the Advocate General's...
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Activity Alarm for Cryptocurrency Blockchains
Vokráčko, Lukáš ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
Cryptocurrencies are becoming popular and the demand for monitoring transactions inside them increases alongside with it. In this thesis, I describe few of the most widespread cryptocurrencies built on top of a blockchain and how to obtain information of their transactions in order to raise alarms. I discuss existing solutions and describe application Cryptoalarm designed for monitoring transactions involving specific addresses in order to raise alarms. Cryptoalarm scans blockchains of cryptocurrencies such as Bitcoin, Bitcoin Cash, Litecoin, Zcash, Dash, Ethereum and raises alarms about address activities in real-time.
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Forensic Analysis of Cryptocurrency Mining Servers
Kelečéni, Jakub ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
This thesis focuses on the mining of cryptocurrency with emphasis on analysis of communication between miner and server. It describes basic principles of cryptocurrencies, mining and employed communication protocols. The next part of thesis is about design and implement modification of existing system (catalogue). This modification will add temporality to the catalog, what increase reliability of stored metadata. Description, functionality and purpose of existing system is included in the next text.
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Cryptocurrencies
Šindelářová, Anna ; Haupt, Jaromír (referee) ; Smutný, Milan (advisor)
Tato bakalářská práce se zaměřuje na téma Kryptoměny. Práce se zabývá vznikem a vývojem kryptoměn, jejich využitím a popisem jejich základních principů fungování. Více podrobně jsou v této práci popsány 3 vybrané kryptoměny – Bitcoin, Ethereum a Monero. Cílem této práce je provést porovnání těchto vybraných kryptoměn, které je popsáno v poslední kapitole.
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Bitcoin from the perspective of law and economics and its implications
Szewczyková, Julie ; Chytilová, Helena (advisor) ; Dupáková, Lenka (referee)
SELECTED ASPECTS OF BITCOIN AND ITS IMPLICATIONS FROM THE STANDPOINT OF THE LAW AND ECONOMICS Abstract Bitcoin is one of the best-known examples of a decentralized convertible cryptocurrency based on blockchain technology. The diploma thesis deals with the main aspects of bitcoin and bitcoin payment networks in complex economic analysis based on the use of standard economic apparatus. The economic analysis is backed by a thorough and relevant legal research. The main goal of the diploma thesis is complex economic and legal analysis of bitcoin. In economic analysis, the emphasis is put on the use of supply-demand analysis, which outlines the basic factors affecting supply and demand for bitcoins. Based on a clear delineation of these factors, the thesis is able to analyse specific aspects of bitcoin. Diploma thesis analyzes the impacts of decentralized setting, as well as risks associated with anonymity of users, crime in connection with bitcoin, time delays in transaction verification, technical and energetic demands on mining, high transaction costs and internet connection needs. Each of these aspects is compared to existing payment institutions or systems. The thesis also examines the legal regulation of bitcoin. Due to the absence of a complex legal regulation, the diploma thesis tries to apply the...
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