# zks_getL2ToL1LogProof

> For the complete documentation index, see [llms.txt](/docs/llms.txt).

POST https://zksync-mainnet.g.alchemy.com/v2/{apiKey}

Retrieves the log proof for an L2 to L1 transaction.

Reference: https://www.alchemy.com/docs/chains/zksync/zk-sync-api-endpoints/zks-get-l-2-to-l-1-log-proof

## Parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| Transaction hash | string | Yes | The transaction hash. |
| Log index | integer | No | Index of the log. |

## Result

**Log proof** (object): The log proof for the specified transaction and log index.

## Example

### Request

```json
{
  "jsonrpc": "2.0",
  "method": "zks_getL2ToL1LogProof",
  "params": [
    "0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e"
  ],
  "id": 1
}
```

### Response

```json
{
  "jsonrpc": "2.0",
  "result": {
    "proof": [
      "0x8c48910df2ca7de509daf50b3182fcdf2dd6c422c6704054fd857d6c9516d6fc",
      "0xc5028885760b8b596c4fa11497c783752cb3a3fb3b8e6b52d7e54b9f1c63521e",
      "0xeb1f451eb8163723ee19940cf3a8f2a2afdf51100ce8ba25839bd94a057cda16",
      "0x7aabfd367dea2b5306b8071c246b99566dae551a1dbd40da791e66c4f696b236",
      "0xe4733f281f18ba3ea8775dd62d2fcd84011c8c938f16ea5790fd29a03bf8db89",
      "0x1798a1fd9c8fbb818c98cff190daa7cc10b6e5ac9716b4a2649f7c2ebcef2272",
      "0x66d7c5983afe44cf15ea8cf565b34c6c31ff0cb4dd744524f7842b942d08770d",
      "0xb04e5ee349086985f74b73971ce9dfe76bbed95c84906c5dffd96504e1e5396c",
      "0xac506ecb5465659b3a927143f6d724f91d8d9c4bdb2463aee111d9aa869874db"
    ],
    "id": 0,
    "root": "0x920c63cb0066a08da45f0a9bf934517141bd72d8e5a51421a94b517bf49a0d39"
  },
  "id": 1
}
```

## Code Examples

### cURL

```bash
curl --request POST \
  --url https://zksync-mainnet.g.alchemy.com/v2/docs-demo \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "zks_getL2ToL1LogProof",
  "params": [
    "0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e",
    1
  ]
}'
```

### JavaScript

```javascript
const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    jsonrpc: '2.0',
    id: 1,
    method: 'zks_getL2ToL1LogProof',
    params: ['0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e', 1]
  })
};

fetch('https://zksync-mainnet.g.alchemy.com/v2/docs-demo', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
```

### Python

```python
import requests

url = "https://zksync-mainnet.g.alchemy.com/v2/docs-demo"

payload = {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "zks_getL2ToL1LogProof",
    "params": ["0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e", 1]
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
```

### Go

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://zksync-mainnet.g.alchemy.com/v2/docs-demo"

	payload := strings.NewReader("{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"method\": \"zks_getL2ToL1LogProof\",\n  \"params\": [\n    \"0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e\",\n    1\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}
```

### Java

```java
HttpResponse<String> response = Unirest.post("https://zksync-mainnet.g.alchemy.com/v2/docs-demo")
  .header("Content-Type", "application/json")
  .body("{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"method\": \"zks_getL2ToL1LogProof\",\n  \"params\": [\n    \"0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e\",\n    1\n  ]\n}")
  .asString();
```

### C#

```csharp
using RestSharp;


var options = new RestClientOptions("https://zksync-mainnet.g.alchemy.com/v2/docs-demo");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"method\": \"zks_getL2ToL1LogProof\",\n  \"params\": [\n    \"0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e\",\n    1\n  ]\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

```


## OpenRPC Method Specification

```yaml
name: zks_getL2ToL1LogProof
summary: Retrieves the log proof for an L2 to L1 transaction.
description: Retrieves the log proof for an L2 to L1 transaction.
params:
  - name: Transaction hash
    required: true
    description: The transaction hash.
    schema:
      title: 32 byte hex value
      type: string
      pattern: ^0x[0-9a-f]{64}$
  - name: Log index
    required: false
    description: Index of the log.
    schema:
      type: integer
result:
  name: Log proof
  description: The log proof for the specified transaction and log index.
  schema:
    type: object
    title: Log Proof
    required:
      - proof
      - id
      - root
    properties:
      proof:
        type: array
        description: Array of strings, each representing a piece of the proof for the specified log.
        items:
          title: 32 byte hex value
          type: string
          pattern: ^0x[0-9a-f]{64}$
      id:
        type: integer
        description: Identifier of the log within the transaction.
      root:
        title: 32 byte hex value
        type: string
        pattern: ^0x[0-9a-f]{64}$
        description: Root hash of the proof, anchoring it to a specific state in the blockchain.
examples:
  - name: zks_getL2ToL1LogProof example
    params:
      - name: Transaction hash
        value: '0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e'
    result:
      name: Log proof
      value:
        proof:
          - '0x8c48910df2ca7de509daf50b3182fcdf2dd6c422c6704054fd857d6c9516d6fc'
          - '0xc5028885760b8b596c4fa11497c783752cb3a3fb3b8e6b52d7e54b9f1c63521e'
          - '0xeb1f451eb8163723ee19940cf3a8f2a2afdf51100ce8ba25839bd94a057cda16'
          - '0x7aabfd367dea2b5306b8071c246b99566dae551a1dbd40da791e66c4f696b236'
          - '0xe4733f281f18ba3ea8775dd62d2fcd84011c8c938f16ea5790fd29a03bf8db89'
          - '0x1798a1fd9c8fbb818c98cff190daa7cc10b6e5ac9716b4a2649f7c2ebcef2272'
          - '0x66d7c5983afe44cf15ea8cf565b34c6c31ff0cb4dd744524f7842b942d08770d'
          - '0xb04e5ee349086985f74b73971ce9dfe76bbed95c84906c5dffd96504e1e5396c'
          - '0xac506ecb5465659b3a927143f6d724f91d8d9c4bdb2463aee111d9aa869874db'
        id: 0
        root: '0x920c63cb0066a08da45f0a9bf934517141bd72d8e5a51421a94b517bf49a0d39'
```