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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 @@ -96,6 +96,14 @@ sentence (in UTF-8 NFKD) used as the password and the string "mnemonic" + passph
in UTF-8 NFKD) used as the salt. The iteration count is set to 2048 and HMAC-SHA512 is used as
the pseudo-random function. The length of the derived key is 512 bits (= 64 bytes).

Words in a mnemonic sentence are separated by a single space (U+0020), except in
Japanese, where the ideographic space (U+3000) is used; see
[[bip-0039/bip-0039-wordlists.md|Wordlists]]. NFKD maps U+3000 to U+0020, so the
two forms of a Japanese sentence derive the same seed. Software that splits a
sentence into words, to look them up in the wordlist or to verify the checksum,
must split it after normalization: splitting on U+0020 beforehand reads a
Japanese sentence as a single word.

This seed can be later used to generate deterministic wallets using BIP-0032 or
similar methods.

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