This research explores how blockchain technology can support better fraud detection in modern financial systems. Financial institutions regularly encounter issues such as identity theft, unauthorized access, and manipulation of transaction records. As financial activities increasingly move to digital platforms, these risks have become more complex and difficult to manage. Many traditional financial systems rely on centralized databases and manual monitoring processes, which may delay the identification of suspicious activities and allow fraudulent transactions to occur before they are detected.Blockchain technology provides a possible solution to these challenges. It operates through a distributed ledger where transaction data are recorded across a network rather than stored in a single central system. Because the information is verified through cryptographic methods and shared among multiple participants, altering or manipulating financial records becomes extremely difficult. This structure allows financial institutions to track transactions more clearly and detect unusual patterns more quickly.In addition, blockchain creates a transparent and reliable record of financial activities, which improves auditing and strengthens accountability among network participants. By introducing decentralized verification and secure record keeping, blockchain systems can support real-time monitoring of financial operations. As a result, integrating blockchain into financial infrastructures may improve fraud detection, reduce financial risks, and increase trust among institutions and users