@cashdev 23 December 2019

Creating a brainwallet with Python 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 https://bitcoincash.network/python/ https://pypi.org/project/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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