Bip39 mnemonic https://penzu.com/p/2ea6922b70254307 A BIP39 seed phrase established with acceptable randomness can not be guessed by way of brute force, since there are simply too numerous permutations. BitBox02 - A successor to the BitBox collection, this hardware wallet supports BIP39 seed phrases and offers a combination of usability and stability. https://penzu.com/p/2ea6922b70254307