Generating simple wallet with only one seed.
npm install generated-wallet
First you need to define environment variable
export TOKEN_SALT=my_token_salt
wallet = require('generated-wallet');
myWallet = wallet('my-very-secure-seed');
Signing raw transaction and returns the raw signed transaction
let signedTransaction = myWallet.sign(tx);
return sender address
let myAddress = myWallet.getAddress();