> For the complete documentation index, see [llms.txt](https://timechain.gitbook.io/neucron-javascript-sdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://timechain.gitbook.io/neucron-javascript-sdk/tokenization-and-proofs/data-integrity.md).

# Data Integrity

Accessor: `sdk.dataIntegrity`

Upload files, text, or text arrays for proof-of-existence/data-integrity flows.

## Method surface

| Method                                | Purpose         |
| ------------------------------------- | --------------- |
| `sdk.dataIntegrity.fileUpload()`      | fileUpload      |
| `sdk.dataIntegrity.textUpload()`      | textUpload      |
| `sdk.dataIntegrity.textArrayUpload()` | textArrayUpload |

## Basic usage

```typescript
import NeucronSDK from '@timechainlabs/neucron-ts-sdk';

const sdk = new NeucronSDK({ authToken: process.env.NEUCRON_TOKEN });

// Use sdk.dataIntegrity methods after authentication.
```

## Notes

* Methods return `Promise<HttpResponse<T>>` unless they are local helpers such as token getters/setters.
* Authenticate with `sdk.auth.login()` or initialize with `authToken` before protected calls.
* Pass `businessId` on business-scoped operations; constructor-level `businessId` is typed but not applied globally.
* Request and response schemas are exported from `@timechainlabs/neucron-ts-sdk` and `@timechainlabs/neucron-ts-sdk/schemas`.