@coolwallet/btc NPM

CoolWallet Bitcoin SDK

Typescript library with support for the integration of Bitcoin for third party application, include the functionalities of generation of addresses and signed transactions.

Install

npm i @coolwallet/btc

Usage

import BTC from '@coolwallet/btc';
import { crypto } from '@coolwallet/core';
import { createTransport } from '@coolwallet/transport-web-ble';

const btc = new BTC();

const transport = await createTransport();

const { privateKey: appPrivateKey } = crypto.key.generateKeyPair();

const appId = 'appId that had been registered by wallet';

const addressIndex = 0;

const address = await btc.getAddress(transport, appPrivateKey, appId, scriptType, 0);

const signTxData = {
    transport,
    appPrivateKey,
    appId,
    scriptType: 1,
    inputs: [{
        preTxHash: "735153f57da91462a01c17937a397aa67f7b5faf9ab74ebcdd4c8f485aba26f5",
        preIndex: 1,
        preValue: "87302",
        sequence: 0xFFFFFFFF,
        addressIndex: 0,
        pubkeyBuf: Uint8Array(33)
    }],
    output: {
        value: "10000",
        address: "3442qW39131y5Q8qR963ehjmxXPAXUWn7Q",
    },
    change: {
        value: "77301.99983500001",
        addressIndex: 0,
        pubkeyBuf: Uint8Array(33)
    }
}

const normalTx = await btc.signTransaction(signTxData)

const usdtSignTxData = {
    transport,
    appPrivateKey,
    appId,
    scriptType: 1,
    inputs: [{
        preTxHash: "735153f57da91462a01c17937a397aa67f7b5faf9ab74ebcdd4c8f485aba26f5",
        preIndex: 1,
        preValue: 87302,
        sequence: 0xFFFFFFFF,
        addressIndex: 0,
        pubkeyBuf: Uint8Array(33)
    }],
    output: {
        value: "546",
        address: "3442qW39131y5Q8qR963ehjmxXPAXUWn7Q",
    },
    change: {
        value: "69926",
        addressIndex: 0,
        pubkeyBuf: Uint8Array(33)
    }
}

const usdtTx = await btc.signUSDTTransaction(usdtSignTxData)

Methods

getAddress

Description

Get address by address index.

The BTC address generated is compatible to BIP141 (SegWit Proposal) and BIP44 with account and change set to 0, which means calling getAddress with addressIndex = i will get the address of folllowing path:

m/44'/0'/0'/0/{i}

In the design of current hardware, we only support path m/44'/0'/0'/0/{i} for speed optimization. This might change in the future and we will then open a more general interface to deal with custom path.

async getAddress(
    transport: Transport, 
    appPrivateKey: string, 
    appId: string, 
    scriptType: ScriptType, 
    addressIndex: number
): Promise<string>

Arguments

Arg	Description	Type	Required
transport	Object to communicate with CoolWallet device	Transport	True
appPrivateKey	Private key for the connected application	string	True
appId	ID for the connected application	string	True
scriptType	Define the type of script of the address	ScriptType	True
addressIndex	The from address index in BIP44 derivation	number	True

signTransaction

Description

Sign Bitcoin Transaction.

async signTransaction(signTxData: signTxType):Promise<string>

signTxType Arguments

Arg	Description	Type	Required
transport	Object to communicate with CoolWallet device	Transport	True
appPrivateKey	Private key for the connected application	string	True
appId	ID for the connected application	string	True
scriptType	Define the type of script of the address	ScriptType	True
inputs	Array of inputs of previous transactions (UTXO)	Inputs	True
output	Output of the transaction	Output	True
change	Address to receive changes	Change	True
confirmCB	Callback of confirmation data to the connected application	Function	False
authorizedCB	Callback of authorized transaction data to the connected application	Function	False

signUSDTTransaction

Description

Sign USDT Transaction

async signUSDTTransaction(signUSDTTxData: signUSDTTxType): Promise<string>

signUSDTTxType Arguments

Arg	Description	Type	Required
transport	Object to communicate with CoolWallet device	Transport	True
appPrivateKey	Private key for the connected application	string	True
appId	ID for the connected application	string	True
scriptType	Define the type of script of the address	ScriptType	True
inputs	Array of inputs of previous transactions (UTXO)	Inputs	True
output	Output of the transaction	Output	True
value	Amount of USDT to transfer	string	True
change	Address to receive changes	Change	True
confirmCB	Callback of confirmation data to the connected application	Function	False
authorizedCB	Callback of authorized transaction data to the connected application	Function	False