What is used in a traditional system to provide proof that a transaction has occurred?

A traditional system relies heavily on physical documents to provide proof that a transaction has occurred. These documents, which may include invoices, receipts, contracts, or shipping papers, serve as tangible evidence of the transaction, allowing for verification and validation in historical records. Physical documentation plays a crucial role in auditing, legal processes, and compliance, as they can be easily reviewed and presented when necessary.

While database logs, digital signatures, and cloud storage have their own respective functions in modern systems, they do not align with the traditional approach of documenting transactions. Database logs serve to track changes within a database but do not inherently prove that a transaction has taken place. Digital signatures provide a level of security and authentication in electronic records but are not a characteristic of traditional systems. Similarly, cloud storage pertains to data management and accessibility rather than the physical documentation of transactions. Therefore, physical documents are the most fitting choice for providing proof of transactions in a traditional system.