How do you create a 12 or 24 mnemonics code for multiple cryptocurrencies (ETH, BTC and so on..)

Question

I just started using Flutter and I am trying to create a crypto wallet app that can support multiple different cryptocurrencies. The current issue I am facing is, is that I don't know how a mnemonics code is being generated for different cryptocurrencies when trying to create a backup for multiple wallets. I am using this library btw: https://pub.dartlang.org/packages/bip39

Any help would be much appreciated!

Answer 1

You can use one mnemonic code for all cryptocurrencies. As you can see in the library documentation you linked, you use the mnemonic code to get a wallet seed. That wallet seed is then used to create a HD wallet.