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BIP-39: say what separates two words #2237

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BIP-39: say what separates two words #2237

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8 changes: 8 additions & 0 deletions bip-0039.mediawiki
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Expand Up @@ -48,6 +48,10 @@ are split into groups of 11 bits, each encoding a number from 0-2047, serving
as an index into a wordlist. Finally, we convert these numbers into words and
use the joined words as a mnemonic sentence.

Words are joined using a single space character (U+0020), except in Japanese,
where the ideographic space (U+3000) is used; see
[[bip-0039/bip-0039-wordlists.md#wordlists-special-considerations|Wordlists (Special Considerations)]].

The following table describes the relation between the initial entropy
length (ENT), the checksum length (CS), and the length of the generated mnemonic
sentence (MS) in words.
Expand Down Expand Up @@ -110,6 +114,10 @@ mnemonic" section is possible, this is not advised and software must compute a
checksum for the mnemonic sentence using a wordlist and issue a warning if it is
invalid.

Computing that checksum requires splitting the sentence into words, and the
split must accept either separator described in
[[#generating-the-mnemonic|Generating the mnemonic]].

The described method also provides plausible deniability, because every passphrase
generates a valid seed (and thus a deterministic wallet) but only the correct one
will make the desired wallet available.
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