minimal-slp-wallet-xrg

minimal-slp-wallet

This is a minimalist Bitcoin Cash (BCH) wallet for use with front end web apps. It's token aware, unlike the wallet the code is forked from: minimal-bch-wallet. It's intended to be used with the gatsby-ipfs-web-wallet web-based wallet, and the xrg-js JavaScript library provided by FullStack.cash

The default derivation path for the wallet keypair is m/44'/245'/0'/0/0. This is the BIP44 standard for SLP token-aware BCH wallets.

Examples

The examples directory shows how to write node.js JavaScript apps that use this library to work with BCH:

• Create a wallet
• Send BCH
• List Tokens
• Send Tokens

How to use it?

Import

Add to your HTML scripts

<script src="https://unpkg.com/minimal-slp-wallet"></script>

Node module

npm install minimal-slp-wallet --save

// module import
import BchWallet from 'minimal-slp-wallet'

// nodejs modules
const BchWallet = require('minimal-slp-wallet/index')

Create new wallets

const bchWallet = new BchWallet()
await bchWallet.walletInfoPromise // Wait for wallet to be created.

// 12 words seed phrase for the wallet
console.log(bchWallet.walletInfo.mnemonic)

// cash address derived from the seed (derivation path: m/44'/245'/0'/0/0)
console.log(bchWallet.walletInfo.cashAddress)

// legacy address derived from the seed (derivation path: m/44'/245'/0'/0/0)
console.log(bchWallet.walletInfo.legacyAddress)

// private key for the BCH address derived from the seed (derivation path: m/44'/245'/0'/0/0)
console.log(bchWallet.walletInfo.privateKey)

Mnemonic encryption

const bchWallet = new BchWallet(null, {
  password: 'myStrongPassword'
})

// 12 words seed phrase for the wallet
console.log(bchWallet.walletInfo.mnemonic)

// encrypted mnemonic
console.log(bchWallet.walletInfo.mnemonicEncrypted)

const bchWallet2 = new BchWallet(bchWallet.walletInfo.mnemonicEncrypted, {
  password: 'myStrongPassword'
})

// decrypted mnemonic
console.log(bchWallet2.walletInfo.mnemonic)

Initialize wallet with mnemonic

// initialize with 12 words seed phrase for the wallet
const bchWallet = new BchWallet(
  'minor bench until split suffer shine series bag avoid cruel orient aunt'
)

// initialize for specific HD derivation path
const bchWallet2 = new BchWallet(
  'minor bench until split suffer shine series bag avoid cruel orient aunt',
  {
    HdPath: "m/44'/245'/0'/1'"
  }
)

Send transactions

You can send funds to other BCH wallets. You can distribute funds to N users by simply extending the receiver array.

const bchWallet = new BchWallet()

const receivers = [
  {
    address: 'bitcoincash:qp2rmj8heytjrksxm2xrjs0hncnvl08xwgkweawu9h',
    // amount in satoshis, 1 satoshi = 0.00000001 Bitcoin
    amountSat: 100000
  }
]

const txid = await bchWallet.send(receivers)

// Transaction ID
// you can then see the transaction in one of the explorers
// example: `https://explorer.bitcoin.com/bch/tx/${tx.txid}`;
console.log(txid)

Send Tokens

You can send tokens in a similar way:

const receiver = {
  address: 'simpleledger:qpeq7xx5x3a2jfa0x0w8cjqp4v9cm842vgsjqwzvfk',
  tokenId: 'a4fb5c2da1aa064e25018a43f9165040071d9e984ba190c222a7f59053af84b2',
  qty: 1.25
}

const txid = await bchWallet.sendTokens(receiver)

// Transaction ID
console.log(txid)

Note: Only single token sends are supported at the moment. i.e. One token type per receiver per transaction.

Get Wallet Balance

Gets balance (confirmed + unconfirmed) for an BCH address

// will get a balance for bchWallet.cashAddress
const myBalance = await bchWallet.getBalance()

// will get a balance for any address
const balanceOfOtherAddress = await bchWallet.getBalance(
  'bitcoincash:qp2rmj8heytjrksxm2xrjs0hncnvl08xwgkweawu9h'
)

List Tokens

List the SLP tokens held by an address.

// will get token balance for bchWallet.cashAddress
const myBalance = await bchWallet.listTokens()

// will get a balance for any address
const balanceOfOtherAddress = await bchWallet.listTokens(
  'simpleledger:qpeq7xx5x3a2jfa0x0w8cjqp4v9cm842vgsjqwzvfk'
)

Get Wallet Transaction History

Get an array of TXIDs of the transactions involving this wallet.

// will get transaction history for bchWallet.cashAddress
const myTransactions = await bchWallet.getTransactions()

// will get transaction history for any address
const txHistoryOfOtherAddress = await bchWallet.getTransactions(
  'bitcoincash:qp2rmj8heytjrksxm2xrjs0hncnvl08xwgkweawu9h'
)

Error Handling

try {
  tx = await bchWallet.send([
    {
      address: 'bitcoincash:qrlhkg4d9z3y88j246a6482xzregxaxnfsagmd2kh3',
      amountSat: 1000
    }
  ])
} catch (err) {
  console.error(err)

  if (err.message && err.message.indexOf('Insufficient') > -1) {
    return alert('Insufficient balance on your BCH account.')
  }

  return alert('Error. Try again later.')
}

Save keys in the browser

While developing BCH apps, remember to never send the private keys / mnemonic / seed phrase to your servers.

• Your servers can be hacked
• Depending on your jurisdiction you may not have the allowance to manage the funds of your users

const bchWallet1 = new BchWallet()

// save the mnemonic for later
localStorage.setItem('BCH_MNEMONIC', bchWallet1.walletInfo.mnemonic)

// retrieve mnemonic to initialize the wallet
const bchWallet2 = new BchWallet(localStorage.getItem('BCH_MNEMONIC'))

Licence

MIT

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