> For the complete documentation index, see [llms.txt](https://docs.bloxchain.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bloxchain.app/introduction/what-is-bloxchain.md).

# What is Bloxchain?

**Bloxchain** is governed smart contract security on Ethereum: policy is enforced **on-chain** by the open-source Protocol. **bloxchain.app** is the hosted UI to operate contracts; the **TypeScript SDK** is for your own integration.

> **Production** — Third-party security audit completed for the published scope. See [Production readiness](/developers/production-readiness.md) and [Audit status](/security/audit-status.md).

## Three surfaces, one enforcement layer

| Surface                | What it is                                                                                 | Best for                                              |
| ---------------------- | ------------------------------------------------------------------------------------------ | ----------------------------------------------------- |
| **Bloxchain Protocol** | Open-source (MPL-2.0) smart contracts: state machine, RBAC, timelocks, meta-transactions   | Deploying and extending Account-style contracts       |
| **bloxchain.app**      | Hosted, **non-custodial** product: sign-in, contract workspace, transactions, policy setup | Operators and administrators without writing app code |
| **@bloxchain/sdk**     | TypeScript clients aligned with Protocol releases                                          | Backends, bots, custom UIs                            |

```
Protocol (on-chain, open source)
    ↑                    ↑
bloxchain.app      @bloxchain/sdk
```

The app and SDK **do not replace** the Protocol. They read state and submit governed operations your wallet is allowed to perform. If policy denies an action, the contract rejects it regardless of which tool you use.

## What the Protocol does

**Bloxchain Protocol** provides **governed operations**: multi-phase transactions, dynamic RBAC, time-locks, meta-transactions (EIP-712), and guarded execution through **EngineBlox** / `SecureOperationState`.

Use it for **Account-style** contracts (treasury, payments, vaults) with separation of duties—not a single hot key for every critical action.

## What bloxchain.app does (and does not)

Product scope and workspace details: [Platform overview](/platform-bloxchain.app/start.md).

We **never hold private keys or custody assets**. See [Security & disclaimers](/security/security-disclaimers.md).

## Choose your path

| I want to…                 | Start here                                                  |
| -------------------------- | ----------------------------------------------------------- |
| Go to production           | [Production readiness](/developers/production-readiness.md) |
| Understand the model first | [How this works](/introduction/operational-model.md)        |
| Pick your path             | [Getting started](/getting-started/getting-started.md)      |
| Use the hosted app         | [Platform get started](/platform-bloxchain.app/start.md)    |
| Integrate in TypeScript    | [SDK quickstart](/getting-started/quickstart.md)            |
| Deploy or extend on-chain  | [Protocol deploy guide](/developers/deployment.md)          |

## Next steps

* [Getting started](/getting-started/getting-started.md)
* [Core principles](/introduction/core-principles.md)


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