mass — BIP39 word #1093
"mass" is word #1093 of the 2048 words in the official BIP39 English wordlist, between mask and master.
In a seed phrase it stands for the 11-bit value
10001000100,
decimal index 1092.
/mæs/ · noun: a large amount of matter without a definite shape, or a crowd
Russian: масса
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):
Position
#1093 of 2048
Hex Index
0x444
4-Letter Prefix
mass
About "mass" in BIP39
- It takes all four letters to identify "mass": "mas" also begins mask and master.
- "mass" is unique only within the English list: it also begins massif in the French list, massaia in the Italian list and massagem in the Portuguese list, so a four-letter backup should say which list it uses.
- "mass" appears in one of the 24 official English test vectors of BIP39: vector #21 (word 18 of 24). Every official vector passes the checksum checker, and How BIP39 works shows how the entropy turns into such words.
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Word #1093 in the Other 9 BIP39 Wordlists
Similar Words — Check Carefully During Recovery
3 BIP39 words differ from "mass" by just a single letter — the most common source of typos when a seed phrase is entered by hand:
Read aloud, "mass" /mæs/ is one sound away from these 6 words: