var Chain = require('chain-node');
var chain = new Chain(blockChain: 'testnet3');

chain.transact(
  inputs: [{
    address: "mxLGQRD9p3MayF7WrUJsyuY4cZdPSH2yA4",
    // Private key never leaves this process!
    private_key: "cNX5yYSnj6Bd3BEjsfV6ZQyn8hQYYDQB79vjHNkv7NAPazo9GBJT",
  }],
  outputs: [{
    address: "mxLGQRD9p3MayF7WrUJsyuY4cZdPSH2yA4",
    amount: 1000
  }],
  change_address: "mwa5qJi4KvqRKu9npGzoqnvfnuMAwfdeGL",
  function(err, resp) {
    console.log(resp);
  }
)