--- title: "BIP39 Word #20: act — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/act/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #20 00000010011 # act — BIP39 word #20 "**act**" is word #20 of the 2048 words in the official BIP39 English wordlist, between [across](/bip39-word/across/) and [action](/bip39-word/action/). In a seed phrase it stands for the 11-bit value `00000010011`, decimal index 19\. /ækt/ · _verb:_ to do something or behave in a particular way [Russian](/ru/ "The BIP39 wordlist with Russian translations"): акт ## Binary Representation Three 1-bits and eight 0-bits; 165 of the 2048 indexes have exactly three 1-bits. One wrong bit turns it into (leftmost bit first): [list](/bip39-word/list/)[draw](/bip39-word/draw/)[carbon](/bip39-word/carbon/)[bar](/bip39-word/bar/)[apology](/bip39-word/apology/)[all](/bip39-word/all/)[about](/bip39-word/about/)[address](/bip39-word/address/)[actual](/bip39-word/actual/)[acquire](/bip39-word/acquire/)[across](/bip39-word/across/) Position Hex Index 0x013 4-Letter Prefix act ## About "act" in BIP39 - All three letters of "act" also begin longer words: [action](/bip39-word/action/), [actor](/bip39-word/actor/), [actress](/bip39-word/actress/) and [actual](/bip39-word/actual/). So "act" cannot be shortened, and a backup that keeps the first four letters of each word stores it as **"act"** but action as **"acti"**. ## Word #20 in the Other 9 BIP39 Wordlists [Czech](/czech/) aspirace [French](/french/) acajou [Italian](/italian/) adagio [Japanese](/japanese/) あたる [Korean](/korean/) 각자 [Portuguese](/portuguese/) acampar [Spanish](/spanish/) ácido [Traditional Chinese](/chinese-traditional/) 他 [Simplified Chinese](/chinese-simplified/) 他 ## Similar Words — Check Carefully During Recovery 2 BIP39 words differ from "act" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [art](/bip39-word/art/)[pact](/bip39-word/pact/) Swap two neighbouring letters and "act" becomes [cat](/bip39-word/cat/), another valid word that is easy to miss when copying a phrase. Read aloud, "act" /ækt/ is one sound away from this word: [actor /ˈæktə/](/bip39-word/actor/) Words sharing the first three letters "act": [action](/bip39-word/action/)[actor](/bip39-word/actor/)[actress](/bip39-word/actress/)[actual](/bip39-word/actual/) ## More BIP39 Words Starting with "A" [ #16 acid ](/bip39-word/acid/)[ #17 acoustic ](/bip39-word/acoustic/)[ #18 acquire ](/bip39-word/acquire/)[ #19 across ](/bip39-word/across/)[ #21 action ](/bip39-word/action/)[ #22 actor ](/bip39-word/actor/)[ #23 actress ](/bip39-word/actress/)[ #24 actual ](/bip39-word/actual/) [View all words starting with "A" ](/bip39-words/a/) ## 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 ](/)