> Do you specifically want to support changing the language of seed words, while keeping the bip32 root seed they generate unchanged? What is the usecase for this?
Yes and no. Yes that the inter-operability will be much better if the same seed could be recorded as in English and in other languages as well. There could be a standalone 3rd party tool to convert mnemonic sentences from one language to another so wallets do not have to support all languages. This, in reality, does not make any wallet more complicated or increase any dev costs. No that I don't think anyone would switch language for fun. And I think the symmetric function in SLIP-0039 is a good idea to help with migration the existing wallets. So this will look like: Chinese English Japanese <=> entropy <=> sym. KDF <==> BIP32 seed ...... Decimal numbers >If changing the language of seeds is not a requirement, then look into Electrum seeds. They are language/wordlist agnostic. So, changing the language is not a requirement. However, the current BIP-39 makes the seed dependent on the language. And I'd like to see it changed. The change will not further complicates the wallets as we can rely on 3rd conversion tools to handle different languages. One additional benefit multiple language support could bring up is, we can write down the mnemonic sentence in two or more different languages simultaneously, as a way to do checksum each other. Regarding Jon's comments: >lack of localized words for recovery phrase causes more money loss than supporting it. This also worries me. Think of the situation that one day, crypto currencies are all over the world. Everyone has some coins. Among them many just cannot handle English. We must provide a way for them to master their crypto assets. Therefore, as Jon had stressed, it is very important to support multiple languages. I really don't like it if only English could be used. And then think of those who do not have a native language wordlist. Allowing representing the seed in decimal numbers will be helpful. Thanks, Weiji
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