Who uses hash functions?

Who exactly utilizes hash functions in the realm of cryptocurrency and finance? Are they exclusively the domain of cryptographers and security experts, or do they play a more ubiquitous role in our financial transactions and data management? Are financial institutions, exchanges, and blockchain networks all relying on hash functions to ensure the integrity and security of their systems? Furthermore, are there specific industries or applications within finance that heavily rely on hash functions for verification, authentication, or tamper-proofing purposes? I'm intrigued to understand the breadth of usage and the significance of hash functions in this dynamic and evolving field.