Alternatively, if you have installed John the Ripper from your system's package manager (e.g., with sudo apt install john ), the script is often already located in a system directory like /usr/share/john/ .
The script scans the .dat file for encrypted keys. If your wallet has multiple addresses (or a "masters" key), it will output multiple hashes. The output looks like this:
Bitcoin Core wallets ( wallet.dat ) are encrypted using a master key derived from a user passphrase. To recover a lost passphrase, one cannot simply "decrypt" the file directly without the key. Instead, the file contains a "checksum" or verification block derived from the master key. Bitcoin2John extracts this verification block, the salt, and the iteration count, formatting them into a hash string that password cracking software can understand. Bitcoin2john
Extract hash, then use all known personal info (birthdays, pet names, etc.) in a custom wordlist.
To see the code logic: open bitcoin2john.py and look for: Alternatively, if you have installed John the Ripper
def extract_mkey(wallet_file): with open(wallet_file, 'rb') as f: data = f.read()
You run the script against your encrypted wallet.dat file to extract the hash. The output looks like this: Bitcoin Core wallets ( wallet
While a useful tool, bitcoin2john is not a magic solution and has several key limitations:
john --format=bitcoin --wordlist=rockyou.txt hash.txt
