Bip39 Seed. It is easy — if you don't worry about copyright inheritance, nobody else will — not your software package or components wallet sellers, not your exchanges, instead of your prosperity managers. What constitutes a "very good wallet" is one that has very clear, very easy to entry documentation https://bookmarklethq.com/story18619442/bip39-wallets-https-linktr-ee-bip39-a-secret-weapon-for-bip39-mnemonic