Event Sourcing

Event Sourcing is an architectural pattern where the state of a system is determined by a sequence of events rather than just the current snapshot. Instead of storing only the final balance, the system records every transaction or action as an immutable event.

This provides a complete, auditable history of how the system reached its current state. In blockchain, this is the native way of operating, as the ledger is essentially a long, append-only log of transactions.

This approach is highly beneficial for financial systems, as it allows for perfect reconciliation and auditability. If a bug or dispute occurs, the entire history can be replayed to identify the exact moment the error occurred.

It also enables complex financial features like time-travel queries, where users can view their account state at any previous block. Event Sourcing ensures that the integrity of the data is maintained over time, providing a robust foundation for decentralized finance.

It is the gold standard for maintaining transparency and accountability in distributed systems.