---
title: "BIP39 Word #302: certain — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/certain/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #302 00100101101 

# certain — BIP39 word #302

"**certain**" is word #302 of the 2048 words in the official BIP39 English wordlist, between [cereal](/bip39-word/cereal/) and [chair](/bip39-word/chair/). In a seed phrase it stands for the 11-bit value `00100101101`, decimal index 301\. 

/ˈsɜːtn/  · _adjective:_ completely sure, or known to be true 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): уверенный 

## Binary Representation

Five 1-bits and six 0-bits; 462 of the 2048 indexes have exactly five 1-bits.

One wrong bit turns it into (leftmost bit first):

[pizza](/bip39-word/pizza/)[grant](/bip39-word/grant/)[aisle](/bip39-word/aisle/)[cup](/bip39-word/cup/)[color](/bip39-word/color/)[canvas](/bip39-word/canvas/)[chicken](/bip39-word/chicken/)[caution](/bip39-word/caution/)[cement](/bip39-word/cement/)[chalk](/bip39-word/chalk/)[cereal](/bip39-word/cereal/) 

Position

Hex Index

0x12D

4-Letter Prefix

cert

## About "certain" in BIP39

- "certain" has 7 letters, but the first four, **"cert"**, already identify it, because **"cer"** also begins [cereal](/bip39-word/cereal/).
- **"cert"** is unique only within the English list: it also begins certeza in the [Spanish list](/spanish/), certo in the [Italian list](/italian/) and certeiro in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses.

## Word #302 in the Other 9 BIP39 Wordlists

[Czech](/czech/) duhovka 

[French](/french/) butiner 

[Italian](/italian/) capello 

[Japanese](/japanese/) おもたい 

[Korean](/korean/) 남자 

[Portuguese](/portuguese/) bitola 

[Spanish](/spanish/) cabeza 

[Traditional Chinese](/chinese-traditional/) 證 

[Simplified Chinese](/chinese-simplified/) 证 

## Similar Words — Check Carefully During Recovery

 One BIP39 word differs from "certain" by just a single letter — the most common source of typos when a seed phrase is entered by hand: 

[curtain](/bip39-word/curtain/) 

Words sharing the first three letters "cer":

[cereal](/bip39-word/cereal/) 

## More BIP39 Words Starting with "C"

[ #298 cement ](/bip39-word/cement/)[ #299 census ](/bip39-word/census/)[ #300 century ](/bip39-word/century/)[ #301 cereal ](/bip39-word/cereal/)[ #303 chair ](/bip39-word/chair/)[ #304 chalk ](/bip39-word/chalk/)[ #305 champion ](/bip39-word/champion/)[ #306 change ](/bip39-word/change/) 

[View all words starting with "C" ](/bip39-words/c/) 

## Seed phrase, key and recovery guides

- [How to Create a Seed Phrase: Step-by-Step Guide and Examples](/create-a-seed-phrase/)
- [BIP 44 – Multi-Account Hierarchy for Deterministic Wallets](/bip-44-multi-account-hierarchy-for-deterministic-wallets/)
- [Electrum Seed vs BIP39: Why Other Wallets Reject It](/electrum-seed-vs-bip39/)

[ Full BIP39 Wordlist ](/)