Quality management in blockchain-based applications is a pressing issue, especially given the growing popularity of blockchain technology in various fields, such as finance, logistics, and healthcare. The paper discusses key issues related to quality assurance in such applications, including scalability, security, performance management, and data consistency. One of the main challenges is to achieve a balance between the decentralized nature of blockchain and the need to maintain high software quality standards. Attention is focused on the need to address security issues, such as protection from attacks and ensuring transaction confidentiality, as well as issues of optimizing data processing speed and improving the efficiency of smart contracts. Testing and quality control methods specific to blockchain applications are disclosed, including automated and manual security testing methods, as well as approaches to monitoring system operation in real time. Recommendations are formulated for improving the processes of development and implementation of blockchain applications, with an emphasis on increasing reliability and security, as well as minimizing possible failures and errors in the system.