crack — BIP39 word #399
"crack" is word #399 of the 2048 words in the official BIP39 English wordlist, between coyote and cradle.
In a seed phrase it stands for the 11-bit value
00110001110,
decimal index 398.
/kræk/ · noun: a narrow break or line on a surface that has split
Russian: трещина
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):
Position
#399 of 2048
Hex Index
0x18E
4-Letter Prefix
crac
About "crack" in BIP39
- "crack" has 5 letters, but the first four, "crac", already identify it, because "cra" also begins 8 other words, among them cradle, craft, cram and crane.
- "crack" appears in two of the 24 official English test vectors of BIP39: vectors #17 (word 17 of 18) and #20 (word 15 of 18). Every official vector passes the checksum checker, and How BIP39 works shows how the entropy turns into such words.
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Word #399 in the Other 9 BIP39 Wordlists
Similar Words — Check Carefully During Recovery
2 BIP39 words differ from "crack" by just a single letter — the most common source of typos when a seed phrase is entered by hand:
Read aloud, "crack" /kræk/ is one sound away from these 3 words: