The thesis details the development of the Crypto Dashboard application with a focus on integration with the Bitcoin network and wallet. The main objective of the thesis is the implementation of a blockchain explorer that allows users to gain a detailed insight into cryptocurrencies, transactions, the Bitcoin wallet, and the current state of the network. The technologies used include ReactJS for the front-end interface, TypeScript for type safety, NodeJS for implementing server logic, and PostgreSQL as the database for data storage. This work demonstrates the design and implementation process of various application functionalities, including user registration and login, cryptocurrency overview, interactive graphs and charts, news and analyses, currency conversion, and specific information about Bitcoin and its mempool. The project structure is explained in detail, including the organization of frontend and backend components and the use of a testnet server for application development and testing. One of the key parts of the application is the implementation of a transaction sending system. Using the Bitcoin testnet network, real transactions were simulated, and the system utilizes the Bitcoin Core API library for key management, transaction creation, and their transmission within the network.