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

# zks_getL2ToL1LogProof

> Returns the proof for the corresponding L2 to L1 log, given a transaction hash and the index of the L2 to L1 log produced within the transaction.

### Parameters

<ParamField query="chainId" type="string" default="232" required>
  Unique identifier for a blockchain network.
</ParamField>

<ParamField body="id" type="number" default={1} required>
  Request identifier used to match responses.
</ParamField>

<ParamField body="jsonrpc" type="string" default="2.0" required>
  JSON-RPC version.
</ParamField>

<ParamField body="method" type="string" default="zks_getL2ToL1LogProof" required>
  JSON-RPC method name.
</ParamField>

<ParamField body="params" type="object" default={["0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e",0]} placeholder="[&#x22;0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e&#x22;,0]" required>
  Positional parameters for <code>zks\_getL2ToL1LogProof</code>:

  <ul>
    <li><code>params\[0]</code>: The hash of the L2 transaction.</li>
    <li><code>params\[1]</code>: The index of the L2 to L1 log in the transaction.</li>
  </ul>
</ParamField>

### Returns

<ResponseField name="result" type="object">
  The JSON-RPC result.

  <Expandable title="properties">
    <ResponseField name="id" type="integer">
      The position of the leaf in the Merkle tree of L2->L1 messages for the block.
    </ResponseField>

    <ResponseField name="proof" type="array">
      The Merkle proof for the message.

      <Expandable title="items">
        <ResponseField name="items[]" type="string">
          Hex-encoded proof element.
        </ResponseField>
      </Expandable>
    </ResponseField>

    <ResponseField name="root" type="string">
      The root hash representing the Merkle tree root at the time the L2 to L1 log was generated.
    </ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```bash Curl theme={null}
  curl --request POST \
    --url https://api.uniblock.dev/uni/v1/json-rpc?chainId=232 \
    --header 'content-type: application/json' \
    --data '{
      "id": 1,
      "jsonrpc": "2.0",
      "method": "zks_getL2ToL1LogProof",
      "params": [
        "0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e",
        0
      ]
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json Success theme={null}
  {
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
      "id": 42,
      "proof": [
        "0xabc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1",
        "0xdef456def456def456def456def456def456def456def456def456def456def4"
      ],
      "root": "0xabc123def4567890abc123def4567890abc123def4567890abc123def4567890"
    }
  }
  ```
</ResponseExample>