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Mobile Application for Decentralized Elections
Pastushenko, Vladislav ; Perešíni, Martin (referee) ; Tamaškovič, Marek (advisor)
Tato práce popisuje vývoj decentralizované mobilní aplikace pro operační systém Android, která využívá protokol hlasování v zasedací místnosti založený na blockchainu. Článek popisuje motivaci k napsání práce, obecné pojmy spojené s vývojem decentralizovaných aplikací, popisuje plán vývoje, popisuje zvolené technologie, implementace a testování aplikace, zvláštnosti při práci s Flutterem při interakci s chytrými kontrakty Solidity.
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Use of blockchain technology for recording changes in cloud storage
Spolek, Jaroslav ; Malina, Lukáš (referee) ; Dzurenda, Petr (advisor)
The bachelor’s thesis focuses on the design and implementation of a module to ensure data integrity on an existing cloud storage platform, Nextcloud. The theoretical part deals with issues related to the security of cloud storage services, and subsequently, it provides a general introduction to blockchain technology and its implementation in the form of Ethereum blockchain technology. Included are the basic principles of Ethereum blockchain technology and the principles of smart contracts. In the practical part, the design proposal, tools used during the implementation, and the implementation of the data integrity module utilising blockchain technology are presented. The results of the system testing are then analysed, and external influences and factors affecting the cost and operation of the module are identified. This analysis concludes with a proposal for future improvements addressing the current shortcomings of the module.
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Modeling and Simulation of Incentive Mechanisms in Ethereum
Burianová, Tereza ; Fiedor, Jan (referee) ; Perešíni, Martin (advisor)
Tématem této bakalářské práce je poplatkový mechanismus v síti Ethereum, zejména změny představeny v EIP-1559. Cílem práce je zkoumat chování mechanismu a navrhnout případná možná vylepšení v případě nalezených nedostatků. Dříve používaný aukční systém vyžadoval libovolné nastavení výše poplatku uživatelem, což vedlo k přeplatkům a vysoké volatilitě výše poplatků. Tyto problémy nastaly převážně kvůli vyššímu vytížení sítě po popularizaci projektů jako například decentralizované finance, NFT kolekce a metaverse. Nový poplatkový mechanismus zavedl proměnlivou velikost bloku, která se dokáže přizpůsobit aktuálnímu vytížení sítě. Base fee, hodnota značící minimální výši poplatku potřebnou pro zahrnutí do bloku, je pak vypočítána na základě zaplněnosti předchozího bloku, což dělá poplatky více předvídatelnými. Bylo navrženo několik simulačních experimentů, které zkoumají typické chování a možné slabiny mechanismu. Nakonec bylo nalezeno možné vylepšení a byl navržen další výzkum. Cíle práce byly splněny a výsledky byly prezentovány.
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Decentralized Autentication System Based on Blockchain
Mračna, Štefan ; Malinka, Kamil (referee) ; Januš, Filip (advisor)
This work studies the effects of the integration of blockchain technologies into authentication systems, specifically biometric authentication systems for unlocking doors. The work analyzes different blockchain and authentication technologies and determines which of these technologies are appropriate for this purpose. The work also compares centralized and decentralized authentication systems. A decentralized authentication system which includes blockchain technologies is then proposed and a simplified version of the system (where individual devices in the system are represented by processes) is implemented. Testing of effectiveness, security, reliability and memory usage is then conducted under different conditions.
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Deanonymization Heuristics for Cryptocurrencies
Anton, Matyáš ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
The cryptocurrencies are growing more and more popular, both due to their independency on institutions and the feeling of anonymity they provide. This is, however, also accompanied by an increasing number of their abuse for criminal activities. This thesis explores the principles of current cryptocurrencies as well as techniques used for increasing anonymity of their usage. Based on the findings, it proposes a solution attemping to deanonymise activity in select cryptocurrencies.
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Identification of Cryptocurrency Users
Zrnčík, Henrich ; Matoušek, Petr (referee) ; Veselý, Vladimír (advisor)
abstract.en={The 3rd January 2009 is considered to be the beginning of the cryptocurrency era. This work will deal with one of the ways of obtaining information about cryptocurrency users. It will be done by retrieving it from public websites where users often knowingly or unknowingly publish their cryptocurrency's address for different purposes (donation accounts or online payments which include personal data) as a result of which it is possible to link their crypto account with their real identity. The information is obtained through web scrappings. The result is an implemented application capable of automated collecting of data about the identity of cryptocurrency users and its subsequent storage in a structured database.
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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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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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Virtual Wallet Compatible with Cryptocurrency
Marušin, Marek ; Rychlý, Marek (referee) ; Očenášek, Pavel (advisor)
The purpose of this thesis is to identify differences between classical payment systems and cryptocurrencies. A paper also compares the most well-known cryptocurrencies and explains how they work. By analyzing the principles of cryptocurrencies focused mainly on the Ethereum, we can see how virtual wallets for these digital tokens can be implemented and how we can work with custom tokens. A demonstration of created virtual wallet for Ethereum and custom ERC20 tokens is shown. Implemented practical example using Python programming language covers principles as generating private and public keys with appropriate addresses, manipulation with tokens and transactions or providing tests.
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