Bip39 Buffer Is Not Defined Storing entropy (for instance trying to keep a deck of cards in a selected shuffled get) is unreliable as compared to storing a mnemonic. In place of storing entropy, shop the mnemonic produced from the entropy. Steganography can be helpful when storing the mnemonic. Here https://bookmarkmiracle.com/story20032458/trust-wallet-seed-phrase-generator-bip39-word-list-secrets