Bip39 Passphrase. Take into consideration the best way to securely back up and move on the passphrase if essential: Although you may theoretically count on your memory, you might want to consider a safe backup system. BIP39 specifies a list of 2048 words from which the mnemonic phrase is selected. https://allkindsofsocial.com/story4348529/bip-39-https-linktr-ee-bip39-a-secret-weapon-for-bip39-mnemonic