# System ### Overview System module provides low-level types, storage, and functions for your blockchain. All other pallets depend on the **`System`** library as the basis of your **`Subsembly`** runtime. System module defines critical storage items for your blockchain. Some of them are: * **`Account`** - stores account balance and nonce * **`ExtrinsicCount`** - total extrinsics count for current block * **`ParentHash`** - hash of the previous block * **`Events`** - vector of events during block execution And finally, it contains some important functions that access the storage, compute the extrinsics root, verify the origin of extrinsic, etc. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://subsembly.gitbook.io/subsembly/modules/core/untitled.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.