Bip39 numbers https://www.4shared.com/s/fAf7kF4dLku BIP85: A more recent proposal making it possible for the deterministic derivation of many BIP39 mnemonic seeds from a master seed. Because of the cryptographic design and style of BIP-39, a weak passphrase doesn't reduce the protection of the other wallets or assistance reveal the seed words. https://franciscougju442.bravesites.com/entries/general/Produce-Bitcoin-Addresses-from-Seed-Every-Little-Thing-You-Required-to-Know