Try to brute force and find private keys for it. 19. Download abc, run and let it download all of the bcc blockchain. dat on local dir Aug 18, Updating wallet If you installed Qtum the old way (without using the repository) 2021. ... BIP39 is the use of a mnemonic phrase -- a group of easy to remember words -- to serve as a back up to .... The passphrase is a BIP39 mnemonic (see https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki ). I have the bitcoin and ethereum public addresses for this mnemonic. I am wondering if it's feasible to brute force the passphrase. Each word is 11 bits (2^11 = 2048 possible words).