Address Balance Change Notifier

This script monitors the balance of a Bitcoin address every 24 hours and triggers an email notification if the balance has changed in the last 2 days. This Node.js script has been written to work on Microsofts Functions-as-a-Service (FaaS) offering, specifically Azure Functions Timer Trigger. Rewriting it for a vanilla Node.js backend shouldn't require much effort though. Just implement a setIntervall() method to call the function at specific time intervalls.

Configuration Variables

To customize the functionality, you may adjust the following private variables in a local.settings.json file:

• "BTCAddressToMonitor": Bitcoin address to monitor, e.g. bc1q3vdf3np392k28hze3zjffk4mk2ka8z9r593jxn
• "eMailHost": Your email host, e.g. smtp.office365.com
• "eMailUserName": Your email address, e.g. john.doe@outlook.com
• "eMailPassword": Email password, e.g. password123
• "eMailFrom": Text that appears in the from field of the email, e.g. 'John Doe' <john.doe@outlook.com>
• "eMailTo": The email address to which the notification mail is sent, e.g. max.mustermann@gmail.com

Here is an example of such a local.settings.json file

{
  "IsEncrypted": false,
  "Values": {
    "BTCAddressToMonitor": "bc1q3vdf3np392k28hze3zjffk4mk2ka8z9r593jxn",
    "eMailHost": "smtp.office365.com",
    "eMailUserName": "john.doe@outlook.com",
    "eMailPassword": "password123",
    "eMailFrom": "'John Doe' <john.doe@outlook.com>",
    "eMailTo": "max.mustermann@gmail.com"
  }
}