12-word phrase · One missing word
I’m missing one word of my 12-word phrase: can it be recovered?
If you are missing a single word of your twelve-word phrase, the short answer is yes, and it will probably be solved the same day. The reason is not having a powerful computer: it is that your phrase has a built-in check that instantly throws out 99.6 % of wrong guesses.
Why a twelve-word phrase is not what it looks like
The words in your phrase are not just any words. They come from a fixed list of 2048, the same one in every wallet that uses this system. That already narrows things enormously: if one of your words is not on that list, it is simply misspelled, and that is a clue, not a problem.
But the second point is the important one: the last word of the phrase is not free. It contains a check on the previous ones, like the control digit on a bank account number. Of all imaginable combinations of twelve words from the list, only one in sixteen fits. So when a word is missing, there are not 2048 possible phrases: there are far fewer.
The numbers, without the headache
| What you’re missing | Phrases to check | Can it be done? |
|---|---|---|
| 1 word, knowing the slot | about 128 | Yes, in minutes |
| 1 word, not knowing the slot | about 1,500 | Yes, same day |
| 2 words | hundreds of thousands | Yes |
| 3 words | hundreds of millions | Sometimes, with more details |
| 4 or more | too many | Practically no |
| The whole phrase | an unimaginable number | No, never |
Look at the gap between the first row and the last. It is not a scale of «easy, moderate, hard»: it is the difference between checking a hundred and twenty-eight phrases and a number no computer on earth can traverse. That is why I can tell you your case works or doesn’t without it sounding like an excuse: the numbers leave no room for opinion.
The two details that change everything
Finding the possible phrases is the easy part. The work is knowing which one is yours, because they are all valid and each opens a different wallet. Two details settle it instantly:
- Which app you created the wallet with. MetaMask, Trust Wallet, Electrum, a Ledger… each organises accounts its own way, and knowing it avoids having to look everywhere.
- One address from that wallet. If you have it — in an email from the exchange you sent funds from, in a screenshot, in a history — the work stops being a blind search and becomes checking against something known. That is instant.
What does make the case hopeless
- A forgotten additional password, what some wallets call the «25th word» or passphrase. It is not on the list, it does not self-correct and it leaves no trace: each one opens a different wallet. If you forgot it, the correct phrase is not enough.
- Remembering nothing about the order, on top of missing words. With two known gaps there is work to do; with twelve loose words and no order, there isn’t.
- Not being able to prove the wallet is yours. Without that I don’t start a case, however easy it is technically.
If you have 24 words instead of 12
The reasoning is the same, with one difference in your favour: in twenty-four-word phrases the internal check is stricter, so even more wrong combinations are discarded. I cover it separately in I lost one word of my 24-word seed.