# Sign TxHash

The "Sign TxHash" feature in the KrypC wallet-dev Service API enables users to securely sign transaction hashes, providing a cryptographic signature for specific transaction data on the blockchain. This capability enhances security and authenticity verification, ensuring a reliable method for confirming the integrity and authorization of transactions within decentralized systems.

This Submit Transaction using this method. 

## API Specification

## Sign TxHash API

<mark style="color:green;">`POST`</mark> `https://api.krypcore.com/api/v0/devWallet/signTxHash`

To sign TxHah API under the given instance.&#x20;

#### Headers

| Name                                            | Type   | Description            |
| ----------------------------------------------- | ------ | ---------------------- |
| DappId<mark style="color:red;">\*</mark>        | String | DappId                 |
| Authorization<mark style="color:red;">\*</mark> | String | User Auth key obtained |
| ChainId                                         | String | ChainId                |
| SubscriptionId                                  | String | SubscriptionId         |

#### Request Body

| Name                                         | Type   | Description |
| -------------------------------------------- | ------ | ----------- |
| privateKey<mark style="color:red;">\*</mark> | String | Private Key |
| txnHash<mark style="color:red;">\*</mark>    | String | TxnHash     |

{% tabs %}
{% tab title="200: OK SUCCESS" %}

```javascript
{
    "Data": "wEYz8E2zxuDMos+c1E8ZFQzq49uFZK/R+3LSZLAMPrQXNPaxzlRjE4rkMTPRCz64vmkb9hUeTtVvhgDG61qc9wE=",
    "Message": "Signed txn hash successfully",
    "Status": "SUCCESS"
}
```

{% endtab %}

{% tab title="401: Unauthorized Failure in authentication" %}

```javascript
{
    "message": "Invalid API key in request"
}
```

{% endtab %}

{% tab title="500: Internal Server Error Key values should be given" %}

```
{
    "message": "Internal Server Error"
}
```

{% endtab %}
{% endtabs %}

Take a look at how you might call this method using our official libraries, or via `curl`

{% tabs %}
{% tab title="curl" %}

```bash

curl --location 'https://api.krypcore.com/api/v0/devWallet/signTxHash' \
--header 'DappId: **********' \
--header 'Authorization: **********' \
--header 'SubscriptionId: ********' \
--header 'ChainId: ********' \
--header 'Content-Type: application/json' \
--data '{
   "privateKey": "**********",
    "txnHash":"**********"
}'
```

{% endtab %}

{% tab title="Node.js (Fetch)" %}

```javascript

var myHeaders = new Headers();
myHeaders.append("DappId", "**********");
myHeaders.append("Authorization", "**********");
myHeaders.append("SubscriptionId", "********");
myHeaders.append("ChainId", "********");
myHeaders.append("Content-Type", "application/json");

var raw = JSON.stringify({
  "privateKey": "**********",
  "txnHash": "**********"
});

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  body: raw,
  redirect: 'follow'
};

fetch("https://api.krypcore.com/api/v0/devWallet/signTxHash", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));
```

{% endtab %}

{% tab title="Python " %}

```python

import requests
import json

url = "https://api.krypcore.com/api/v0/devWallet/signTxHash"

payload = json.dumps({
  "privateKey": "**********",
  "txnHash": "**********"
})
headers = {
  'DappId': '**********',
  'Authorization': '**********',
  'SubscriptionId': '********',
  'ChainId': '********',
  'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)


```

{% endtab %}

{% tab title="Golang" %}

```go

package main

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

func main() {

  url := "https://api.krypcore.com/api/v0/devWallet/signTxHash"
  method := "POST"

  payload := strings.NewReader(`{
   "privateKey": "**********",
    "txnHash":"**********"
}`)

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
    return
  }
  req.Header.Add("DappId", "**********")
  req.Header.Add("Authorization", "**********")
  req.Header.Add("SubscriptionId", "********")
  req.Header.Add("ChainId", "********")
  req.Header.Add("Content-Type", "application/json")

  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }
  fmt.Println(string(body))
}
```

{% endtab %}
{% endtabs %}