Vechain

Sign Transaction

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

getVechainSignedTransaction()

Supported Coin Type

• VECHAIN(VET)

• VECHAIN Token(VECHAIN_ERC20)

Parameters

• unsignedTx: unsigned hexadecimal tx Vechain Docs

• path: key path, wallet sign with that private key with a given key path (BIP32 ex) "m/44'/818'/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: vechain or vechain token's decimals.

Requirements

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

• D'CENT Biometric Wallet version 2.23.2 or higher is required.

Useage

import { thorify } from 'thorify'
import BigNumber from 'bignumber.js'
const Web3 = require("web3");		// Recommend using require() instead of import here
const web3 = thorify(new Web3(), 'http://localhost:8669')

//https://github.com/vechain/thorify/blob/72988996cead74f9c73e38860c2e055ca35a108e/src/extend/accounts.ts#L12

let clauses = {
    from: recvAddress,
    to: toAddr,
    value: DcentWebConnector.unitConverter(amount, decimals).num.toString(),
    gas
}
let rawData = await web3.eth.accounts.signTransaction(clauses, VechainConfig.DummyKey)
rawData = rawData.rawTransaction.substr(0, rawData.rawTransaction.length - 134).slice(2)

let rawBuf = Buffer.from(rawData, 'hex')
let length  = rawData.length / 2
let adjustedRaw = ''  
let size = 0

if (rawBuf[0] < 0xc0) {
  adjustedRaw = null
}

if (rawBuf[0] <= 0xf7) {
  adjustedRaw = rawData.slice(2)
} else if (rawBuf[0] <= 0xff) {
  switch (rawBuf[0] - 0xf7) {
    case 1: 
      size = 1
      break
    case 2:
      size = 2
      break
    default:
      adjustedRaw = null
  }
  adjustedRaw = rawData.slice(2 + (size * 2))
} else {
  adjustedRaw = null  
}

length = adjustedRaw.length / 2
if (length < 56) {
  adjustedRaw = (0xc0 + length).toString(16) + adjustedRaw
} else if (length < 256) {  
  adjustedRaw = '0xf8' + (length).toString(16) + adjustedRaw
} else {
  adjustedRaw = '0xf9' + (length).toString(16) + adjustedRaw
}

const transactionJson = {
    coinType: DcentWebConnector.coinType.VECHAIN,
    sigHash: adjustedRaw.slice(2),
    path: `m/44'/818'/0'/0/0`,
    decimals, // 18
    fee: fee, 
    symbol: 'VET',
}

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

Returned response object

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