bitcoin-notification-client.js

var redis = require('redis');

var client = redis.createClient();

var pullNotifications = function() {
  // if notification in list rpop it else block until one is available; timeout=0;
  client.brpop('_bitcoin_notifications_', '_bitcoin_notifications_', 0, function(e, data) {
    if(!data.length) return;
    data = JSON.parse(data[1]);
    switch(data.type) {
      case "block":
        // do something
        console.log('new block!');
        console.log(data);
      break;

      case "transaction":
        // do something
        console.log('new transaction!');
        console.log(data);
      break;
    }    
    pullNotifications();
  });
};

pullNotifications();