Bip39. At the start you need to retail outlet it Individually out of your seed. Owning your seed and also your passphrase in the identical place defeats the objective of possessing a passphrase to begin with. No, there is not any technological Restrict to the size of your respective passphrase. https://yxzbookmarks.com/story19491799/bip39-wallets-https-linktr-ee-bip39-how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-generator