Bip39 Brute. Theoretically, one can Imagine out the mnemonic phrase by his have, but It's not at all Protected, because a human simply cannot do an awesome career with the random generation. The simplest way to secure 1’s wallet is to have a mnemonic phrase generated by the program code. https://bookmarkplaces.com/story18542303/bip39-entropy-to-mnemonic-the-2-minute-rule-for-seed-phrase-generator-for-trust-wallet