If you accidentally lost some of the 12 word backup phrase this trick will help you recover the forgotten parts. Mnemonic code for generating deterministic keys. You can enter an existing BIP39 mnemonic, or generate a new random one. I strongly suggest that when you enter the mnemonic, you also select a password, which changes the seed master key without changing the mnemonic, allowing you to share the mnemonic without risking your funds. For 12-word seed phrases all twelve go in the BIP39 Mnemonic field and the BIP39 Passphrase field is left blank. However, you may follow the instructions in BIP39 with only slight changes to get 12, 15, 18, or 21 words. The English-language wordlist for the BIP39 standard has 2048 words, so if the phrase contained only 12 random words, the number of possible combinations would be 2048¹² = 2¹³², and the phrase would have 132 security bits. It consists of two parts: generating the mnemonic and converting it into a binary seed. All of your private keys and addresses are derived from it. I haven't had much luck digging around for an answer to this. In terms of security 12-word recovery seed is safe enough (128 bits of entropy). Both models are compatible with public standards and it is possible to recover your wallet with 12, 18 or 24-word seed on both devices. A passphrase is a series of simple unrelated words that can be used as a password. Typing your own twelve words will probably not work how you expect, since the words require a particular structure (the last word is a checksum). Without the passphrase you will not be able to access your wallet, as, if enabled, it becomes a necessary component to your seed. As the passphrase is the “25th seed word”, this means that your entire wallet — key-pairs and addresses (all that secret stuff), will be generated from the passphrase too — from all 25 words. Recovery seed and Trezor []. For more info see the BIP39 spec . Info: Note that we want 24 words in our BIP39 seed phrase, so we are using 256 bits because it is said to be more secure. 12 is the most common seed format. They are easy to remember but hard to guess. You can enter an existing BIP39 mnemonic, or generate a new random one. For 24-word seed phrases, the BIP39 Passphrase field is also left blank. Typing your own twelve words will probably not work how you expect, since the words require a particular structure (the last word is a checksum). Step 4: Divide Our 264 Bits Into Twelve … For more info see the BIP39 spec. In other words, the words when put together (the idiom) means something other the literal meanings of the individual words. For 13-word and 25-word seed phrases, the last word of the sequence goes in the BIP39 Passphrase as is the case with the word TREZOR in the example. This 12-word phrase is the master seed — your private keys all rolled up into one, easily managed format. An idiom is a group of words which over time through usage develop a meaning that isn't deductible from the individual words used. The generator will now output a 12-word BIP39 mnemonic, which can be used to seed a wallet. The random phrase generator uses idiom phrases and it also gives the meaning of the idiom. While using Trezor Wallet, Trezor Model T creates a wallet with 12 seed words and Trezor One generates a 24-word seed. Generate a random mnemonic : GENERATE 3 6 9 12 15 18 21 24 words, or enter your own below . Generator a passphrase using this free tool. Typing your own twelve words will probably not work how you expect, since the words require a particular structure (the last word is a checksum).