Read bitcoin blocks from disk with bitcore

reading-blocks.js

// updated version with bcoin at https://gist.github.com/braydonf/528a51785f0f5641464d172696cd2112

var bitcore = require('bitcore');
var fs = require('fs');
var glob = require('glob');
var async = require('async');

var Block = bitcore.Block;

glob('./blk*.dat', null, function(err, files) {

  async.eachSeries(files, function(filename, next) {

    console.log('Loading Block File: ' + filename);

    var file = fs.readFile(filename, function(err, data) {

      var blocks = [];
      var byteLength = data.length / 2;
      var pos = 0;
      
      while (true) {
        var magic = data.readUInt32LE(pos);
        if (magic != 0xD9B4BEF9) {
          throw new Error('Incorrect Magic');
        }
        var size = data.readUInt32LE(pos + 4);
        var chunk = data.slice(pos, 8 + pos + size);
        var block = Block.fromRawBlock(chunk);
        console.log('File: ' + filename + ' Block: ' + block.hash);
        blocks.push(block);
        pos += 8 + size;
        if (pos > byteLength) {
          break;
        }
      }
      
      next();
      
    });

  }, function(err) {
    if (err) {
      throw err;
    }
  });

});