Background: The rapid evolution of technology in the financial technology (fintech) sector has necessitated the adoption of innovative solutions to address increasing demands for higher data rates, lower latency, and enhanced security. Traditional centralized systems are susceptible to data tampering, service disruptions, and man-in-the-middle attacks, compromising the integrity of sensitive financial transactions. Objectives: This paper aims to explore the convergence of blockchain technology, smart contracts, and machine learning to address security, transparency, and operational efficiency challenges in the fintech sector. It investigates the implications of these technologies for compliance, regulatory frameworks, and ethical governance. Method: The study reviews existing literature and data sources spanning the last decade, with a focus on blockchain applications in fintech. Inclusion criteria include studies on decentralized ledgers, smart contract automation, and machine learning algorithms for predictive analytics. Comparative analyses are presented through flowcharts, graphs, and tables to highlight operational improvements, security enhancements, and cost reductions. Findings: Blockchain technology provides a decentralized and immutable ledger that enhances transparency and security in financial transactions. Smart contracts automate processes, reducing operational costs and improving accessibility to underserved populations. Machine learning enhances blockchain applications by enabling predictive analytics and data-driven decision-making. Despite significant advancements, challenges remain, including the need for robust governance structures to ensure ethical implementation and compliance with regulatory standards. Significance: This review offers new insights by integrating blockchain and machine learning in the context of fintech, addressing critical aspects such as operational efficiency, security, and regulatory compliance that were underexplored in prior studies. It highlights the transformative potential of these technologies in fostering innovation while providing a roadmap for overcoming bottlenecks and paving the way for a secure, inclusive, and efficient financial ecosystem. Keywords: Fintech, AI in Finance, Smart Contracts, Distributed Ledgers, Blockchain
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