GenesisDB is a specialized event store database designed for event-driven applications, emphasizing immutable, time-ordered event recording. This document outlines its technical architecture, capabilities, and operational characteristics, establishing prior art while safeguarding proprietary details. Central to GenesisDB is the principle of deriving state from an append-only sequence of events, ensuring full auditability and deterministic replay. Events are organized hierarchically by subjects, facilitating efficient querying and access control. Each event adheres to a structured format aligned with the CloudEvents specification, incorporating metadata for integrity and traceability. The system employs a globally ordered event log and a write-ahead log (WAL) for durability, ensuring consistent recovery from failures. Additionally, GenesisDB features a reference data mechanism for managing large payloads, a dedicated system event log for administrative actions, and an indexing infrastructure to optimize read operations. The in-memory caching layer enhances performance by maintaining a complete set of user events in RAM. Overall, GenesisDB combines robust event management with comprehensive operational features, making it suitable for high-performance event-driven applications.