Bip39 Words. Firstly you should store it SEPARATELY from the seed. Getting your seed and also your passphrase in the same place defeats the objective of aquiring a passphrase in the first place. But of course, the ultimate barrier is you. Your seed phrase would be the master vital on https://sparxsocial.com/story9036446/bip39-passphrase-https-linktr-ee-bip39-not-known-details-about-bip39-list