to convert mnemonics to private keys:

1. install nodejs
2. install dependencies
3. run command

1.

tested with node version: v8.11.3 get it from https://nodejs.org/en/download/

2.

git clone https://github.com/Switcheo/mnemonic-to-private-key
cd mnemonic-to-private-key
npm install

3.

MNEMONIC='first second third forth fifth sixth seventh eighth ninth tenth eleventh twelfth' node .

mnemonic-to-private-key