Sign Transaction

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


Supported Coin Type


  • HAVAH Token(HSP20)


  • unsignedTx: unsigned hexadecimal tx Hevah(ICON) Docs

  • 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.


  • D'CENT Bridge version 1.5.0 or higher is required.

  • D'CENT Biometric Wallet version 2.26.0 or higher is required.


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

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,
    symbol: 'HVH',

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

Returned response object

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

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