// Notice the "/ws" in the url.
var btcd = require('btcd')('wss://user:password@localhost:8334/ws',
                           __dirname + '/rpc.cert');

// All the jsonrpc calls are available as methods:
btcd.getblockhash(0, function(err, hash){
  if (err) throw err;
  console.log(hash); // 000000000019d6689c085ae...
});

btcd.createrawtransaction(
  [{ txid: ..., vout: 0 }],
  { '1KDZMzoahiAHtAbp8VuVvNahm5SaN3PFXc': 0.5 },
  function(err, rawtx) {
   // ...
  }
)

// Calls with notifications emits additional events:
btcd.notifyreceived([ '1KDZMzoahiAHtAbp8VuVvNahm5SaN3PFXc' ], function(err) {
  if (err) throw err;
  // Listening started succesfully, transactions will now trigger 'recvtx' below
});

btcd.on('recvtx', function(tx, block) {
  // process tx
});

// Close the connection
btcd.close();