Blockchain technology enhances security, transparency, and productivity in financial services. This chapter examines how blockchain, paired with the Internet of Things (IoT) and Artificial Intelligence (AI), is reforming the financial industry and enhancing a safe and linked smart financial service sector. Blockchain’s dispersed and tamper-resistant capabilities, when paired with AI and IoT, have the potential to change crucial financial processes, aggregate confidence, reduce costs, and improve the end-user experience. The chapter reviews blockchain, its role in finance, and how IoT and AI contribute to financial innovation. It then analyzes the synergy between IoT, AI, and blockchain in the banking sector, exhibiting the potential benefits of combining this expertise for more efficiency. The chapter delves into ample financial applications of blockchain, such as cross-border payments, stock trading, smart contracts, digital proof of identity, authentication, and cryptocurrencies like Bitcoin and Ethereum. Asset tokenization, supply chain financing, trade finance, Decentralised Finance (DeFi), regulatory compliance, fraud protection, peer-to-peer lending, insurance claim processing, and Initial Coin Offerings (ICOs) are all referred. Furthermore, elements such as clearance and agreement systems, syndicated loans, risk management, and loyalty programs are addressed to prove blockchain’s widespread influence on financial services. The chapter also examines research gaps in blockchain applications for the banking sector, highlighting the need for improved solutions to difficulties. Additionally, integrating IoT and AI with blockchain is studied, offering perceptions on how these technologies work together to improve financial services. Real-world case studies are run to determine practical implementations. The chapter also reviews unresolved concerns and future research prospects for increasing blockchain’s position in finance, accenting the technology’s endless progress and intact potential. Finally, recommendations are suggested to improve the use and effectiveness of blockchain, IoT, and AI in banking. The chapter rubs by creating significant issues, presenting a thorough education of how blockchain might alter the financial sector, and outlining prospects for study and practical application.