The emergence of digital technologies contributed to the emergence and rapid development of digital commerce, and at the same time, the number of electronic payments, the use of digital and virtual currencies increased. The article presents an analysis of the legal nature of such a financial instrument as cryptocurrency, characterizes the distinctive features, highlights the advantages and disadvantages. The purpose of the work is to consider the regulatory legal position of cryptocurrency in the modern world, to highlight the legal practice in cases of the circulation of cryptocurrency, to study the role of cryptocurrency in transnational offenses, to explore possible options for combating cybercrime, which is carried out using the use of cryptocurrency. The methodology of the work is represented by a set of methods and techniques, operations that are used to study the topic and achieve the set goal, namely: hermeneutic, historical, extrapolation, comparative-legal, comparison and generalization, analysis, synthesis, deduction. Results of the work: in today's reality there is no unified international legal regulation of cryptocurrency, which complicates the prevention and fight against transnational offenses, the means or subject of which are cryptocurrencies and mining.

Тhe specific features of activity and competence of electoral ombudsmen while they are detecting administrative and criminal electoral violations are analyzed in the article. The conclusions concerning the expediency of establishing an institute for the protection of citizens electoral rights have been made and the ways of improvement of electoral ombudsmen activityduring the detection and fixation of electioral violations have been proposed.

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The source of law, the case-law of the European Court of Human Rights (hereinafter – the ECtHR), is playing an increasingly significant role in the practice of judicial proceedings in Ukraine. The activities of the ECtHR significantly affect the implementation of the principle of the rule of law in Ukraine in criminal proceedings. Therefore, the phenomenon of judicial precedent and the application of ECtHR practice in criminal law requires comprehensive analysis. The work aims to study the case law and practice of the ECHR in criminal law, problems of theory and practice of application of court precedents by national courts, and ways to solve them. The research methodology consists of such methods as historical and legal; comparative law; formal and logical; empirical; cognitive; method of analogy; synthesis method; method of analysis. The value of ECtHR decisions is that such decisions, more quickly than other criminal procedural means, make adjustments to the law enforcement process of public authorities, thus improving the mechanism of criminal procedural regulation to guarantee conventional and constitutional human rights. In addition, the recognition of the case law of the ECtHR as a source of law is necessary for the adaptation of national legislation of Ukraine to the legislation of the European Union. Although legal precedent is not officially recognized as a source of law in Ukraine, the decision of the ECtHR recognizing case law can be considered in Ukraine as a rule of law.