Bip39 Is Not Defined The password can be penned down along with the mnemonic phrase, but it would be more effective to keep in mind it, to ensure that an extremely two-issue recovery system could be reached: for unblocking Bitcoins, you will want “what you've” plus “what you already know”. https://socialfactories.com/story3960224/bip39-last-word-checksum-the-2-minute-rule-for-seed-phrase-generator