Bip39. First and foremost you must shop it SEPARATELY from the seed. Obtaining your seed along with your passphrase in the same locale defeats the goal of getting a passphrase in the first place. What constitutes a "great wallet" is one that has obvious, easy to obtain documentation on supported https://siambookmark.com/story19152757/bip39-generator-https-linktr-ee-bip39-not-known-factual-statements-about-ian-coleman-bip39