Creating a brainwallet with Python
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Using a brainwallet is a terrible idea. We humans are terrible at creating phrases that cannot be easily brute force attacked.
Using a brainwallet is a terrible idea and you're likely to loose all your coins.
But its also awesome and convenient when developing and testing.
What's a brainwallet?
A brainwallet is simply a text phrase, such as steal these coins
that is encoded into a private key. Encoded with sha256 and some magic –sha256("steal these coins")
.
Creating a brainwallet with Python
...using the libraries bitcoincash and qrcode
from bitcoincash.wallet import CBitcoinSecret, P2PKHBitcoinAddress
import hashlib
def calculate_brainwallet(phrase):
h = hashlib.sha256(phrase).digest()
private_key = CBitcoinSecret.from_secret_bytes(h)
address = P2PKHBitcoinAddress.from_pubkey(private_key.pub)
return address, private_key
SECRET_PHRASE = b'secret phrase replace or loose all coins'
cashaddr, privkey = calculate_brainwallet(SECRET_PHRASE)
For extra convenience, output the addresses as QR codes in the terminal
def print_qrcode(data):
import qrcode
qr = qrcode.QRCode()
qr.add_data(data)
qr.print_ascii()
print_qrcode(str(cashaddr))
print(f"Cashadddr: {cashaddr}")
print_qrcode(str(privkey))
print(f"Private key: {privkey}")
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