cat — BIP39 word #287
"cat" is word #287 of the 2048 words in the official BIP39 English wordlist, between casual and catalog.
In a seed phrase it stands for the 11-bit value
00100011110,
decimal index 286.
/kæt/ · noun: a small furry animal with whiskers, often kept as a pet
Russian: кошка
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
#287 of 2048
Hex Index
0x11E
4-Letter Prefix
cat
About "cat" in BIP39
- All three letters of "cat" also begin longer words: catalog, catch, category and cattle. So "cat" cannot be shortened, and a backup that keeps the first four letters of each word stores it as "cat" but catalog as "cata".
- "cat" appears in one of the 24 official English test vectors of BIP39: vector #19 (word 1 of 12). Every official vector passes the checksum checker, and How BIP39 works shows how the entropy turns into such words.
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Word #287 in the Other 9 BIP39 Wordlists
Similar Words — Check Carefully During Recovery
6 BIP39 words differ from "cat" by just a single letter — the most common source of typos when a seed phrase is entered by hand:
Swap two neighbouring letters and "cat" becomes act, another valid word that is easy to miss when copying a phrase.
Read aloud, "cat" /kæt/ is one sound away from these 7 words: