This RFC defines how to use multilang mnemonics in an alternative way than defined by [BIP39](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki) while staying compatible with it.
## Motivation
Vanilla BIP39 discourages using non-English mnemonics and only few libraries and applications handle them. Users who want a non-English mnemonic thus loose compatibility with most of the ecosystem.
## English mnemonics
Mnemonics in English follow BIP39.
## Non-English mnemonics
BIP39 defines multilang (non-English) mnemonics using the hash of the sentence in the mnemonic's language.
A dictionary `D` of size `N` is an ordered list that contains the distinct words `D(1), ..., D(N)`.
All dictionaries have the same size `N`.
Let `E` be the English dictionary, and `M` a multilang dictionary.
The only change of the present RFC with respect to BIP39 is that in the hash's input, each word `M(i)` is replaced with the corresponding English word `E(i)`.
Applications SHOULD allow the user to export their multilang mnemonic to English (using the inverse bijection) to allow full compatibility with BIP39.
## Example
| index | English Dictionary | French Dictionary |