Bip39 compliant passphrase https://collinmmss433.lucialpiazzale.com/from-concept-to-fact-generating-bitcoin-addresses-with-bip39 A BIP39 seed phrase made with proper randomness can not be guessed through brute pressure, since you will find just too quite a few permutations. Thanks to the cryptographic design of BIP-39, a weak passphrase does not reduce the security of the other wallet... https://rentry.co/p68weyby