This is fine for learning about Bitcoin, but don't use this is in production. No matter how secure you think you are, someone can likely get into your server an

This is fine for learning about Bitcoin, but don't use this is in production. No matter how secure you think you are, someone can likely get into your server and serve their own JavaScript (making your clients send all their money and/or keys). Also, this tutorial uses a Bitcoin centralized service to communicate with the network, and you have to trust that they won't feed you false information/withhold transactions/perform malleability attacks.