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 |