The rapid advancement of Digital Financial Transformation (DFT) has revolutionized financial transactions, enhancing accessibility and convenience. However, this transformation has also introduced critical security and trust challenges, as the increasing interconnectedness of financial institutions exposes them to cyber threats. Blockchain technology emerges as a promising solution to address these concerns, offering decentralization, transparency, and immutability as key features that can strengthen security in digital financial transactions. Originally developed to support cryptocurrencies like Bitcoin, blockchain provides a robust alternative to centralized financial systems by reducing risks associated with single points of failure. This study examines blockchain’s role in enabling Secure Digital Financial Transformation (SDFT) by analyzing its technical aspects, including consensus mechanisms and encryption methods, to demonstrate how it enhances security and reliability in online transactions. Through an extensive literature review, case studies, and practical applications, the paper explores blockchain’s potential to improve trust and transparency in digital finance. Additionally, the study evaluates the regulatory landscape and emerging trends influencing blockchain adoption in financial systems. By providing insights for researchers, financial institutions, and policymakers, this research aims to contribute to the development of a more secure and resilient digital financial ecosystem through blockchain technology.