@xchainjs/xchain-bitcoin

Modules

• client - Custom client for communicating with Bitcoin using BIP39 bitcoinjs-lib and WIF

Installation

yarn add @xchainjs/xchain-bitcoin
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Following peer dependencies have to be installed into your project. These are not included in @xchainjs/xchain-bitcoin.

yarn add @xchainjs/xchain-client @xchainjs/xchain-crypto @xchainjs/xchain-util axios bitcoinjs-lib wif
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Documentation

xchain bitcoin

How xchain-bitcoin works
How to use xchain-bitcoin

Service Providers

This package uses the following service providers:

Function	Service	Notes
Balances	Sochain	https://sochain.com/api#get-balance
Transaction history	Sochain	https://sochain.com/api#get-display-data-address, https://sochain.com/api#get-tx
Transaction details by hash	Sochain	https://sochain.com/api#get-tx
Transaction fees	Bitgo	https://app.bitgo.com/docs/#operation/v2.tx.getfeeestimate
Transaction broadcast	Sochain	https://sochain.com/api#send-transaction
Explorer	Blockstream	https://blockstream.info

Sochain API rate limits: https://sochain.com/api#rate-limits (300 requests/minute)

Bitgo API rate limits: https://app.bitgo.com/docs/#section/Rate-Limiting (10 requests/second)

Setting Headers for Nine Realms endpoints

If you plan on using the publically accessible endpoints provided by Nine Realms(listed below), ensure that you add a valid 'x-client-id' to all requests

• https://midgard.ninerealms.com
• https://haskoin.ninerealms.com (BTC/BCH/LTC)
• https://thornode.ninerealms.com

Example

import cosmosclient from '@cosmos-client/core'
import axios from 'axios'
import { register9Rheader } from '@xchainjs/xchain-util'

register9Rheader(axios)
register9Rheader(cosmosclient.config.globalAxios)
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For a complete example please see this test

UtxoOnlineDataProviders

default providers

Creating a no-arg BTC Client will default to the following settings:

const defaultBTCParams: UtxoClientParams = {
  network: Network.Mainnet,
  phrase: '',
  explorerProviders: blockstreamExplorerProviders,
  dataProviders: [BlockcypherDataProviders],
  rootDerivationPaths: {
    [Network.Mainnet]: `84'/0'/0'/0/`,
    [Network.Testnet]: `84'/1'/0'/0/`,
    [Network.Stagenet]: `84'/0'/0'/0/`,
  },
  feeBounds: {
    lower: LOWER_FEE_BOUND,
    upper: UPPER_FEE_BOUND,
  },
}
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Note: BlockCypher is the default online data provider (to fetch realtime utxos, balances, etc)

Overriding providers

You can specify own array of providers, whoch will be executed in array-order, to provide automated failover to the subsequent providers if calls to the first providers fail

example sochain v3, blockcypher backup

import { Client, defaultBTCParams, AssetBTC, SochainDataProviders, BlockcypherDataProviders } from '@xchainjs/xchain-bitcoin'
import { SochainNetwork,  SochainProvider } from '@xchainjs/xchain-utxo-providers'
import { Network, UtxoClientParams } from '@xchainjs/xchain-client'

// override with your API key
SochainDataProviders[Network.Mainnet].apiKey = 'YOUR_SOCHAIN_API_KEY'

// or set in env variables so default config can access.
`SOCHAIN_API_KEY={YOUR_SOCHAIN_API_KEY}`
`BLOCKCYPHER_API_KEY={YOUR_BLOCKCYPHER_API_KEY}`
//Default config can access.
process.env.BLOCKCYPHER_API_KEY
process.env.SOCHAIN_API_KEY

//overridde the default init params with your onfig
const initParams: UtxoClientParams = {
  ...defaultBTCParams,
  dataProviders: [SochainDataProviders, BlockcypherDataProviders]// use sochain first and blockcypher as fallback
  phrase: process.env.PHRASE,
}
const btcClient = new Client(sochainParams)

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