> ## Documentation Index
> Fetch the complete documentation index at: https://t2z.d4mr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# prove_transaction

> Generate Orchard zero-knowledge proofs

Generates Halo 2 zero-knowledge proofs for all Orchard actions in the PCZT.

## Signature

<Tabs>
  <Tab title="TypeScript">
    ```typescript theme={null}
    function prove_transaction(pczt: WasmPczt): WasmPczt
    ```
  </Tab>

  <Tab title="Go">
    ```go theme={null}
    func ProveTransaction(pczt *Pczt) (*Pczt, error)
    ```
  </Tab>

  <Tab title="Kotlin">
    ```kotlin theme={null}
    fun proveTransaction(pczt: Pczt): Pczt
    ```
  </Tab>
</Tabs>

## Parameters

<ResponseField name="pczt" type="Pczt" required>
  The PCZT to add proofs to
</ResponseField>

## Returns

Updated PCZT with Orchard proofs.

## Performance

| Operation         | First Run     | Cached        |
| ----------------- | ------------- | ------------- |
| Build proving key | \~10 seconds  | N/A           |
| Generate proofs   | \~1-2 seconds | \~1-2 seconds |

## Example

```typescript theme={null}
// Pre-build proving key (optional, for better UX)
if (!t2z.is_proving_key_ready()) {
  t2z.prebuild_proving_key();
}

// Generate proofs
const provedPczt = t2z.prove_transaction(pczt);

// Verify proofs were added
const info = t2z.inspect_pczt(provedPczt.to_hex());
console.log('Has proofs:', info.has_orchard_proofs);
```

## See Also

* [`prebuild_proving_key`](/api-reference/utilities)
* [`is_proving_key_ready`](/api-reference/utilities)
* [Transaction Flow: Prove](/flow/prove)