bitcoin.getDifficulty().then ((n) =>{
                    res.send(201, n);

                });

var bitcoin = new Bitcoin({
host: 'bitcoin',
port: 18332,
username: 'user',
password: 'password'

rpcuser=user
rpcpassword=password
txindex=1
server=1
rpcallowip=0.0.0.0/0
rpcallowip=::/0