Multi-Blockchain Wallet in Python

Background and Wallet Description

There aren't as many tools available in Python for managing multiple type of currencies in one wallet Thankfully, I've found a command line tool, hd-wallet-derive that supports not only BIP32, BIP39, and BIP44, but also supports non-standard derivation paths for the most popular wallets out there today!

hd-wallet-derive is "universal" wallet and can manage billions of addresses across 300+ coins.

For this exercise, I will only get 2 coins working: Ethereum and Bitcoin Testnet. Ethereum keys are the same format on any network, so the Ethereum keys should work with a custom networks or testnets.

Dependencies

• PHP must be installed on your operating system (any version, 5 or 7).

• Clone the hd-wallet-derive tool.

• bit Python Bitcoin library.

• web3.py Python Ethereum library.

Instructions

HD Derive Wallet Install Guide

This guide serves as a step by step process for setting up the hd-wallet-derive library used to derive BIP32 addresses and private keys for Bitcoin and other alternative coins or "altcoins."

hd-wallet-derive Installation

Now that the latest version of PHP is installed on our machines, we can now proceed to the installation of the hd-wallet-derive library.

Execute the following steps:

• Navigate to the Github website for the hd-wallet-derive library and scroll down to the installation instructions.

• Next, open a terminal and execute the following commands. If you are using Windows, you will need to open the git-bash GUI via C:\Program Files\Git\bin\bash.exe directly to enable something called tty mode that makes the terminal more compatible with Unix systems. Once installed, you may move back to using the usual git-bash terminal.

git clone https://github.com/dan-da/hd-wallet-derive
cd hd-wallet-derive
php -r "readfile('https://getcomposer.org/installer');" | php
php -d pcre.jit=0 composer.phar install

• You should now have a folder called hd-wallet-derive containing the PHP library.

hd-wallet-derive Execution

• Using a command line navigate to your hd-wallet-derive folder.

• Run the following commands.

./hd-wallet-derive.php -g --key=xprv9tyUQV64JT5qs3RSTJkXCWKMyUgoQp7F3hA1xzG6ZGu6u6Q9VMNjGr67Lctvy5P8oyaYAL9CAWrUE9i6GoNMKUga5biW6Hx4tws2six3b9c

./hd-wallet-derive.php -g --key=xprv9tyUQV64JT5qs3RSTJkXCWKMyUgoQp7F3hA1xzG6ZGu6u6Q9VMNjGr67Lctvy5P8oyaYAL9CAWrUE9i6GoNMKUga5biW6Hx4tws2six3b9c --numderive=3 --preset=bitcoincore --cols=path,address --path-change

Wallet.py files runs all the functions which interact with hd-wallet-derive using the command line. The function below calls out the dictionary of coins with addresses and privkeys.

def derive_wallets(coin):
 command = f'./derive -g --mnemonic="{mnemonic}" --cols=path,address,privkey,pubkey --format=json --coin="{coin}" --numderive= 2
    p = subprocess.Popen(command, stdout=subprocess.PIPE, shell=True)
    output, err = p.communicate()
    p_status = p.wait()
    keys = json.loads(output)
    return keys
 coins = {
   ETH: derive_wallets(ETH),
   BTCTEST: derive_wallets(BTCTEST)
  }
print(coins)

To transfer money from one account to another you will need to run send_tx functions.

def send_tx(coin, account, to, amount):
   tx = create_tx(coin, account, to, amount)
   signed_tx = account.sign_transaction(tx)
   if coin == ETH: 
       return w3.eth.sendRawTransaction(signed.rawTransaction)
   elif coin == BTCTEST: 
       return NetworkAPI.broadcast_tx_testnet(signed_tx)

In my case I ran this function in wallet.py file: send_tx(BTCTEST, Account_one, address_two, 0.002) to send BTCTEST from one account to another (see folder screen_shots for more imagies).