> For the complete documentation index, see [llms.txt](https://dev-docs.dcentwallet.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev-docs.dcentwallet.com/dcent-biometric-wallet-for-pc/dcent-web-connector/havah.md).

# 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"
        }
    }
}
```


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