Bip39 Deutsch. Theoretically, one can Feel out the mnemonic phrase by his own, but it is not safe, simply because a human can't do an incredible position with the random technology. The best way to protected just one’s wallet is to take a mnemonic phrase generated by This system code. https://bookmarkchamp.com/story18620464/12-word-seed-phrase-generator-an-unbiased-view-of-bip39-word-list