Latest Bitcoin Block Versions

lbbv.js

var RpcClient = require('bitcoind-rpc');
var async = require('async');

var config = {
  protocol: 'http',
  user: 'bitcoin',
  pass: 'local321',
  host: '127.0.0.1',
  port: '8332'
};

var rpc = new RpcClient(config);

rpc.getBlockCount(function(err, data) {
  if (err) {
    throw err;
  }

  var versionThrees = [];
  var otherVersions = [];
  var count = data.result;
  var c = 0;

  async.whilst(
    function() {
      return c < 1000;
    },
    function(callback) {
      var height = count - c;
      rpc.getBlockHash(count, function(err, data) {
	if (err) {
          throw err;
	}
        var hash = data.result;
	rpc.getBlock(hash, function(err, data) {
          if (err) {
            throw err;
          }
          var block = data.result;
          var version = block.version;
          if (version === 3) {
            versionThrees.push(version);
          } else {
            otherVersions.push(version);
          }

          c++;
          callback();
	});
      });
    },
    function(err) {
      if (err) {
	throw err;
      }
      console.log('Block Version = 3:', versionThrees.length);
      console.log('Block Version != 3:', otherVersions.length);
    }
  );
});