> ## Documentation Index
> Fetch the complete documentation index at: https://docs.genlabs.co/llms.txt
> Use this file to discover all available pages before exploring further.

# H256

> **H256** = [`StructInstance`](/reference/sdk/typescript/index/type-aliases/StructInstance)\<*typeof* [`H256`](/reference/sdk/typescript/schemas/system-types/variables/H256)>

Defined in: [metacomputer/gen-framework/client-and-test-utils/client-sdk-ts/packages/client-sdk/src/schemas/system-types.ts:20](https://github.com/gen-bc/gen/blob/main/metacomputer/gen-framework/client-and-test-utils/client-sdk-ts/packages/client-sdk/src/schemas/system-types.ts#L20)