cryptowrench 0.1.7

A set of tools for nerding around with crypto.

Cryptowrench 🔑🔮

This is a set of tools that I created to learn and play around with blockchains and cryptocurrencies in general.

Install with:

pip -m install cryptowrench

Feel free to use it for your own projects.

📖 Examples

• Create a new wallet
• Import an existing wallet (from mnemonic words)
• Import an existing wallet (from seed)

Create a new wallet

from cryptowrench.wallet import Wallet

# This will create a root wallet automatically
root_wallet = Wallet()

# Now you can show the mnemonic words generated. Store them in a safe place!
# They will help you recover your wallet if you ever lose your computer. You can
# also use them to import this wallet into a different wallet application.
print(root_wallet.words)

# IMPORTANT NOTE: You should never use your root wallet to sign transactions
# directly. Instead, you are supposed to use it to generate multiple "child
# wallets" using the method introduced in BIP 32 (see: https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki).
# These child wallets are the ones you should use for receiving and sending
# transactions.

# Enough talk! Let's create our first child wallet!
child_wallet = root_wallet.hd_wallet("m/84'/0'/0'/0/0")

# That's it :)

# These are your keys (in serialized format). For details on key serialization,
# see: https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#Serialization_format
print(child_wallet.serialized_extended_private_key)
print(child_wallet.serialized_extended_public_key)

# Now let's see your bitcoin address so people can send you lots of BTCs.
print(child_wallet.address.bitcoin.P2WPKH_wit0)

Import an existing wallet (from mnemonic words)

from cryptowrench.wallet import Wallet

# IMPORTANT: Do not use the following words to generate your wallet because they
# are not random and they are publicly available in the internet. If you do it,
# you will lose all your money and axe-throwing monkeys will descend from the
# skies to hunt you down.
words = 'fetch pool sight try enhance squirrel must range rotate maple resemble forest'
# If your wallet had a password, you should pass it to the Wallet class as well.
pwd = ''

# This will import a root wallet from the provided mnemonic and password.
root_wallet = Wallet(mnemonic=words, passphrase=pwd)

# This is the first child wallet.
child_wallet = root_wallet.hd_wallet("m/84'/0'/0'/0/0")
print(f"P2WPKH0:  {child_wallet.address.bitcoin.P2WPKH_wit0}")

# You can also generate old wallet formats, like this:

# Original bitcoin wallet format (P2PKH or Pay-to-PubKey-Hash).
# How to recognize them? They start with the number 1.
# NOTE: it is not recommended to use this wallet format nowadays because it uses
# the most amount of space inside a transaction and is therefore the most
# "expensive" address type.
child_wallet = root_wallet.hd_wallet("m/44'/0'/0'/0/0")
print(f"P2PKH:    {child_wallet.address.bitcoin.P2PKH}")

# BIP 13 bitcoin wallet format (P2SH or Pay-to-Script-Hash).
# How to recognize them? They start with the number 3.
# NOTE: to better understand what these addresses enable in the bitcoin
# blockchain, refert to the original BIP that introduced them:
# https://github.com/bitcoin/bips/blob/master/bip-0013.mediawiki
# Also you can take a look at BIP 16, which introduced the corresponding new
# transaction type: https://github.com/bitcoin/bips/blob/master/bip-0016.mediawiki
child_wallet = root_wallet.hd_wallet("m/49'/0'/0'/0/0")
print(f"P2SH:     {child_wallet.address.bitcoin.P2SH}")

# Finally, if your seed comes from an Ethereum wallet, you can also peek into
# those addresses as well:
child_wallet = root_wallet.hd_wallet("m/44'/60'/0'/0/0")
print(f"Ethereum: {child_wallet.address.ethereum}")

Import an existing wallet (from seed)

from cryptowrench.wallet import Wallet

# IMPORTANT: Do not use the following seed to generate your wallet because is
# not random and it is publicly available in the internet. If you do it, you
# will lose all your money and angry elephants will eat all your crops.
# Make sure the seed is in bytes.
seed = bytes.fromhex('000102030405060708090a0b0c0d0e0f')

# This will import a root wallet from the provided seed.
root_wallet = Wallet(seed=seed)

# This is the first child wallet.
child_wallet = root_wallet.hd_wallet("m/44'/60'/0'/0/0")
print(f"Ethereum:  {child_wallet.address.ethereum}")

⚠ Disclaimer

Although I try my best to make these tools as correct and reliable as possible, please for the love of dinosaurs do not rely on them for storing your money. Use a proper wallet for that instead (see: ethereum.org/en/wallets/ for some fully featured ones).

That said, this library has been tested against publicly available test vectors (i.e. from bip32 and bip39, among others), which means that it should be mostly correct for those functionalities. Expect more tests to be added in the future, and see run_tests.py if you would like to run these tests yourself.

🤝 Colaborate :)

Please create issues/pull requests/feature requests where needed. I'm also looking to collaborate in other open source projects, so let me know if you would like to talk!