Bip39 Seed. The passphrase isn't chosen through the predefined list of 2048 words – it may be any word or phrase you decide on. It's also discouraged to produce words straight from imagined and make use of a protected cryptographic purpose to do so. Coin guidance should be properly documented https://one-bookmark.com/story18856625/bip39-wallet-https-linktr-ee-bip39-how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-wallets