Salt prepending "mnemonic"

[curtis-h]

Great library, really appreciate your work!

I'm wondering if the salt() should be transforming the passphrase by prepending "mnemonic"?

const salt = (passphrase: string) => nfkd(`mnemonic${passphrase}`);

As far as I can tell this is undocumented, and could catch developers unawares, if they haven't dived in to the code, creating a passphrase different to what they expect.

Some ideas I've had for possible alternatives:

• fallback if no passphrase is provided
• force a passphrase to be provided
• provide a separate function that uses the exact password given

Happy to make a PR if it helps :)

[paulmillr]

this is undocumented

https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki#user-content-From_mnemonic_to_seed

[curtis-h]

Sorry I was not aware of that, thankyou for letting me know :)