This article provides a comprehensive guide to understanding, using, and troubleshooting —the essential bridge between your encrypted wallet and a brute-force cracker like John the Ripper or Hashcat. What Exactly is Bitcoin2john? Despite its name, Bitcoin2john is not a hacking program. It is a data extraction utility. The "john" in its name refers to John the Ripper , the famous password cracking software.
john --format=bitcoin hash.txt Or, if you want to use a custom wordlist: Bitcoin2john
Older Bitcoin Core wallets (pre-0.4.0) used . Modern wallets use AES-256-CBC (Advanced Encryption Standard with Cipher Block Chaining). It is a data extraction utility
If you have an old encrypted wallet.dat file from the Bitcoin Core client (formerly Bitcoin-Qt) and you cannot remember the passphrase, you need a specialized forensic tool. Enter . Bitcoin2john is not a hacking program.