Retrieve Blockchain Block Height

var Blockchain = '0x714d2ac07a826b66ac56752eebd7c77b58d2ee842e523d913fd0ef06e6bdfcae';

Circular.GetBlockCount(Blockchain)
  .then(data => {
    // do something with the data in JSON format
  });

Output

{
  "Result": 200, // Success
  "Response": {
    "BlockCount": 1000 // Block Height
  },
  "Node": "0x..." // Answering Node
}