# Havah

## Sign Transaction

The D'CENT Web SDK provides functions for signing transaction of coins.

### **getHavahSignedTransaction()**

#### Supported Coin Type

* HAVAH(HTS)
* HAVAH Token(HSP20)

#### Parameters 

* unsignedTx: unsigned hexadecimal tx [Hevah(ICON) Docs](https://docs.icon.community/getting-started/how-to-run-a-local-network/decentralizing-a-local-network)
* path: key path, wallet sign with that private key with a given key path (BIP32 ex) "m/44'/858'/0'/0/0").
* fee: fee, It is fee that wallet displays on the screen.
* symbol: symbol, It is a symbol that the wallet displays on the screen.
* decimals: havah or havah token's decimals.

#### Requirements

* `D'CENT Bridge` version 1.5.0 or higher is required.
* D'CENT Biometric Wallet version 2.26.0 or higher is required.

#### Useage 

```javascript
import IconService from 'icon-sdk-js'

const { IconBuilder, IconAmount, IconConverter, IconUtil } = IconService

const httpProvider = new HttpProvider('https://ctz.solidwallet.io/api/v3');
const iconService = new IconService(httpProvider);
// networkId of node 1:mainnet, 2~:etc
const networkId = new BigNumber("3"); // input node’s networkld
const version = new BigNumber("3"); // version

// Recommended icx transfer step limit :
// use 'default' step cost in the response of getStepCosts API
const stepLimit = await this.getDefaultStepCost(); // Please refer to the above description.

// Timestamp is used to prevent the identical transactions. Only current time is required (Standard unit : us)
// If the timestamp is considerably different from the current time, the transaction will be rejected.
const timestamp = (new Date()).getTime() * 1000;
const value = IconAmount.of(Number(amount), IconAmount.Unit.ICX).toLoop()

// Enter transaction information
const { IcxTransactionBuilder } = IconBuilder
const icxTransactionBuilder = new IcxTransactionBuilder();
const transaction = icxTransactionBuilder
  .nid(networkId)
  .from(walletAddress)
  .to(MockData.WALLET_ADDRESS_2)
  .value(value)
  .version(version)
  .stepLimit(stepLimit)
  .timestamp(timestamp)
  .nonce(IconConverter.toBigNumber(1))
  .build();

const rawData = Buffer.from(IconUtil.generateHashKey(IconConverter.toRawTransaction(tx))).toString('hex')
const sigHash = rawData

const transactionJson = {
    coinType: DcentWebConnector.coinType.HAVAH,
    sigHash: sigHash,
    path: `m/44'/858'/0'/0/0`,
    decimals: IconAmount.Unit.ICX,
    fee,
    symbol: 'HVH',
}

var result
try {
    result = await DcentWebConnector.getHavahSignedTransaction(transactionJson);  
} catch (e) {
    console.log(e)
    result = e
}
```

#### Returned response object

```json
{
    "header": {
        "version": "1.0",
        "response_from": "havah",
        "status": "success"
    },
    "body": {
        "command": "transaction",
        "parameter": {
            "signed_tx": "0x31aa13b5e04cb6fc6381ea0520bf7f6727ebdb6e96cd7ca8625bb3e3dd36cf0e2cee4ece13aa9f7ddc09ee10c74aa00af954201829d8016317f10f5a921dcc0d"
        }
    }
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://dev-docs.dcentwallet.com/dcent-biometric-wallet-for-pc/dcent-web-connector/havah.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.