diff --git a/lib/messages/builder.js b/lib/messages/builder.js
index 7a0ad4f..97814c9 100644
--- a/lib/messages/builder.js
+++ b/lib/messages/builder.js
@@ -2,7 +2,7 @@
 
 var Message = require('./message');
 var BloomFilter = require('../bloomfilter');
-var packageInfo = require('../../package.json');
+
 var inherits = require('util').inherits;
 var bitcore = require('bitcore');
 var BN = bitcore.crypto.BN;
@@ -11,6 +11,7 @@ var BufferWriter = bitcore.encoding.BufferWriter;
 var BufferUtil = bitcore.util.buffer;
 var $ = bitcore.util.preconditions;
 var _ = bitcore.deps._;
+var utils = require('./utils');
 
 function builder(options) {
   /* jshint maxstatements: 150 */
@@ -46,192 +47,7 @@ function builder(options) {
     commands: commands
   };
 
-  /* shared */
-
-  function checkFinished(parser) {
-    if(!parser.finished()) {
-      throw new Error('Data still available after parsing');
-    }
-  }
-
-  function getNonce() {
-    return bitcore.crypto.Random.getRandomBuffer(8);
-  }
-
-  function writeIP(ip, bw) {
-    var words = ip.v6.split(':').map(function(s) {
-      return new Buffer(s, 'hex');
-    });
-    for (var i = 0; i < words.length; i++) {
-      var word = words[i];
-      bw.write(word);
-    }
-  }
-
-  function writeAddr(addr, bw) {
-    if (_.isUndefined(addr)) {
-      var pad = new Buffer(Array(26));
-      bw.write(pad);
-      return;
-    }
-
-    bw.writeUInt64LEBN(addr.services);
-    writeIP(addr.ip, bw);
-    bw.writeUInt16BE(addr.port);
-  }
-
-  function writeInventory(inventory, bw) {
-    bw.writeVarintNum(inventory.length);
-    inventory.forEach(function(value) {
-      bw.writeUInt32LE(value.type);
-      bw.write(value.hash);
-    });
-  }
-
-  function parseIP(parser) {
-    var ipv6 = [];
-    var ipv4 = [];
-    for (var a = 0; a < 8; a++) {
-      var word = parser.read(2);
-      ipv6.push(word.toString('hex'));
-      if (a >= 6) {
-        ipv4.push(word[0]);
-        ipv4.push(word[1]);
-      }
-    }
-    ipv6 = ipv6.join(':');
-    ipv4 = ipv4.join('.');
-    return {
-      v6: ipv6,
-      v4: ipv4
-    };
-  }
-
-  function parseAddr(parser) {
-    var services = parser.readUInt64LEBN();
-    var ip = parseIP(parser);
-    var port = parser.readUInt16BE();
-    return {
-      services: services,
-      ip: ip,
-      port: port
-    };
-  }
-
-  function sanitizeStartStop(obj) {
-    /* jshint maxcomplexity: 10 */
-    $.checkArgument(_.isUndefined(options.starts) || _.isArray(options.starts));
-    var starts = obj.starts;
-    var stop = obj.stop;
-    if (starts) {
-      starts = starts.map(function(hash) {
-        if (_.isString(hash)) {
-          return BufferUtil.reverse(new Buffer(hash, 'hex'));
-        } else {
-          return hash;
-        }
-      });
-    } else {
-      starts = [];
-    }
-
-    for (var i = 0; i < starts.length; i++) {
-      if (starts[i].length !== 32) {
-        throw new Error('Invalid hash ' + i + ' length: ' + starts[i].length);
-      }
-    }
-
-    stop = obj.stop;
-    if (_.isString(stop)) {
-      stop = BufferUtil.reverse(new Buffer(stop, 'hex'));
-    }
-    if (!stop) {
-      stop = BufferUtil.NULL_HASH;
-    }
-    obj.starts = starts;
-    obj.stop = stop;
-
-    return obj;
-  }
-
-  /**
-   * The version message is used on connection creation to advertise
-   * the type of node. The remote node will respond with its version, and no
-   * communication is possible until both peers have exchanged their versions.
-   * By default, bitcore advertises itself as named `bitcore:0.8`.
-   *
-   * @param{Object} obj - properties for the version
-   * @param{String} obj.subversion - version of the client
-   * @param{Buffer} obj.nonce - a random 8 byte buffer
-   */
-  commands.version = function(obj) {
-    Message.call(this, obj);
-    this.command = 'version';
-    _.assign(this, obj);
-    this.magicNumber = magicNumber;
-    this.nonce = this.nonce || getNonce();
-    this.services = this.services || new BN(1, 10);
-    this.timestamp = this.timestamp || new Date();
-    this.version = this.version || protocolVersion;
-    this.subversion = this.subversion || '/bitcore:' + packageInfo.version + '/';
-    this.startHeight = this.startHeight || 0;
-  };
-  inherits(commands.version, Message);
-
-  commands.version.fromObject = function(obj) {
-    return new commands.version(obj);
-  };
-
-  commands.version.fromBuffer = function(payload) {
-    var parser = new BufferReader(payload);
-    var obj = {};
-    obj.version = parser.readUInt32LE();
-    obj.services = parser.readUInt64LEBN();
-    obj.timestamp = new Date(parser.readUInt64LEBN().toNumber() * 1000);
-
-    obj.addrMe = {
-      services: parser.readUInt64LEBN(),
-      ip: parseIP(parser),
-      port: parser.readUInt16BE()
-    };
-    obj.addrYou = {
-      services: parser.readUInt64LEBN(),
-      ip: parseIP(parser),
-      port: parser.readUInt16BE()
-    };
-    obj.nonce = parser.read(8);
-    obj.subversion = parser.readVarLengthBuffer().toString();
-    obj.startHeight = parser.readUInt32LE();
-
-    if(parser.finished()) {
-      obj.relay = true;
-    } else {
-      obj.relay = !!parser.readUInt8();
-    }
-    checkFinished(parser);
-
-    return commands.version.fromObject(obj);
-  };
-
-  commands.version.prototype.getPayload = function() {
-    var bw = new BufferWriter();
-    bw.writeUInt32LE(this.version);
-    bw.writeUInt64LEBN(this.services);
-
-    var timestampBuffer = new Buffer(Array(8));
-    timestampBuffer.writeUInt32LE(Math.round(this.timestamp.getTime() / 1000), 0);
-    bw.write(timestampBuffer);
-
-    writeAddr(this.addrMe, bw);
-    writeAddr(this.addrYou, bw);
-    bw.write(this.nonce);
-    bw.writeVarintNum(this.subversion.length);
-    bw.write(new Buffer(this.subversion, 'ascii'));
-    bw.writeUInt32LE(this.startHeight);
-    bw.writeUInt8(this.relay);
-
-    return bw.concat();
-  };
+  commands.version = require('./commands/version')({magicNumber: magicNumber});
 
   /* verack */
 
@@ -263,7 +79,7 @@ function builder(options) {
     Message.call(this, options);
     this.command = 'ping';
     this.magicNumber = magicNumber;
-    this.nonce = options.nonce || getNonce();
+    this.nonce = options.nonce || utils.getNonce();
   };
   inherits(commands.ping, Message);
 
@@ -280,7 +96,7 @@ function builder(options) {
     var parser = new BufferReader(payload);
     obj.nonce = parser.read(8);
 
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.ping.fromObject(obj);
   };
 
@@ -303,7 +119,7 @@ function builder(options) {
     var parser = new BufferReader(payload);
     obj.nonce = parser.read(8);
 
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.pong.fromObject(obj);
   };
 
@@ -311,28 +127,7 @@ function builder(options) {
     return this.nonce;
   };
 
-  /* block */
-
-  commands.block = function(options) {
-    Message.call(this, options);
-    this.command = 'block';
-    this.magicNumber = magicNumber;
-    this.block = options.block;
-  };
-  inherits(commands.block, Message);
-
-  commands.block.fromObject = function(options) {
-    return new commands.block(options);
-  };
-
-  commands.block.fromBuffer = function(payload) {
-    var block = Block.fromBuffer(payload);
-    return commands.block.fromObject({block: block});
-  };
-
-  commands.block.prototype.getPayload = function() {
-    return this.block.toBuffer();
-  };
+  commands.block = require('./commands/block')({Block: Block, magicNumber: magicNumber});
 
   /* tx */
 
@@ -390,13 +185,13 @@ function builder(options) {
       obj.inventory.push({type: type, hash: hash});
     }
 
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.getdata.fromObject(obj);
   };
 
   commands.getdata.prototype.getPayload = function() {
     var bw = new BufferWriter();
-    writeInventory(this.inventory, bw);
+    utils.writeInventory(this.inventory, bw);
     return bw.concat();
   };
 
@@ -433,7 +228,7 @@ function builder(options) {
       $.checkState(txn_count === 0, 'txn_count should always be 0');
 
     }
-    checkFinished(parser);
+    utils.checkFinished(parser);
 
     return commands.headers.fromObject(obj);
   };
@@ -476,14 +271,14 @@ function builder(options) {
       obj.inventory.push({type: type, hash: hash});
     }
 
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.notfound.fromObject(obj);
 
   };
 
   commands.notfound.prototype.getPayload = function() {
     var bw = new BufferWriter();
-    writeInventory(this.inventory, bw);
+    utils.writeInventory(this.inventory, bw);
     return bw.concat();
   };
 
@@ -504,7 +299,7 @@ function builder(options) {
 
   commands.inv.prototype.getPayload = function() {
     var bw = new BufferWriter();
-    writeInventory(this.inventory, bw);
+    utils.writeInventory(this.inventory, bw);
     return bw.concat();
   };
 
@@ -521,7 +316,7 @@ function builder(options) {
       obj.inventory.push({type: type, hash: hash});
     }
 
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.inv.fromObject(obj);
   };
 
@@ -550,12 +345,12 @@ function builder(options) {
       // todo: time only available on versions >=31402
       var time = new Date(parser.readUInt32LE() * 1000);
 
-      var addr = parseAddr(parser);
+      var addr = utils.parseAddr(parser);
       addr.time = time;
       obj.addresses.push(addr);
     }
 
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.addr.fromObject(obj);
   };
 
@@ -566,7 +361,7 @@ function builder(options) {
     for (var i = 0; i < this.addresses.length; i++) {
       var addr = this.addresses[i];
       bw.writeUInt32LE(addr.time.getTime() / 1000);
-      writeAddr(addr, bw);
+      utils.writeAddr(addr, bw);
     }
 
     return bw.concat();
@@ -594,7 +389,7 @@ function builder(options) {
     var parser = new BufferReader(payload);
     obj.payload = parser.readVarLengthBuffer();
     obj.signature = parser.readVarLengthBuffer();
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.alert.fromObject(obj);
   };
 
@@ -717,7 +512,7 @@ function builder(options) {
     $.checkArgument(payload);
     var parser = new BufferReader(payload);
     obj.data = parser.readVarLengthBuffer();
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.filteradd.fromObject(obj);
   };
 
@@ -763,7 +558,7 @@ function builder(options) {
     this.version = protocolVersion;
     this.magicNumber = magicNumber;
 
-    options = sanitizeStartStop(options);
+    options = utils.sanitizeStartStop(options);
     this.starts = options.starts;
     this.stop = options.stop;
 
@@ -787,7 +582,7 @@ function builder(options) {
       obj.starts.push(parser.read(32));
     }
     obj.stop = parser.read(32);
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.getblocks.fromObject(obj);
   };
 
@@ -818,7 +613,7 @@ function builder(options) {
     this.version = protocolVersion;
     this.magicNumber = magicNumber;
 
-    options = sanitizeStartStop(options);
+    options = utils.sanitizeStartStop(options);
     this.starts = options.starts;
     this.stop = options.stop;
 
@@ -842,7 +637,7 @@ function builder(options) {
       obj.starts.push(parser.read(32));
     }
     obj.stop = parser.read(32);
-    checkFinished(parser);
+    utils.checkFinished(parser);
     return commands.getheaders.fromObject(obj);
   };
 
@@ -881,7 +676,6 @@ function builder(options) {
   };
 
   /* getaddr */
-  //todo: need test data
   commands.getaddr = function(options) {
     Message.call(this, options);
     this.magicNumber = magicNumber;
diff --git a/lib/messages/commands/block.js b/lib/messages/commands/block.js
new file mode 100644
index 0000000..f29450f
--- /dev/null
+++ b/lib/messages/commands/block.js
@@ -0,0 +1,35 @@
+'use strict';
+
+var Message = require('../message');
+var inherits = require('util').inherits;
+var bitcore = require('bitcore');
+
+var Block = bitcore.Block;
+var magicNumber = bitcore.Networks.defaultNetwork.networkMagic.readUInt32LE(0);
+
+function BlockMessage(options) {
+  Message.call(this, options);
+  this.command = 'block';
+  this.magicNumber = magicNumber;
+  this.block = options.block;
+}
+inherits(BlockMessage, Message);
+
+BlockMessage.fromObject = function(options) {
+  return new BlockMessage(options);
+};
+
+BlockMessage.fromBuffer = function(payload) {
+  var block = Block.fromBuffer(payload);
+  return BlockMessage.fromObject({block: block});
+};
+
+BlockMessage.prototype.getPayload = function() {
+  return this.block.toBuffer();
+};
+
+module.exports = function(options) {
+  Block = options.Block;
+  magicNumber = options.magicNumber;
+  return BlockMessage;
+};
diff --git a/lib/messages/commands/version.js b/lib/messages/commands/version.js
new file mode 100644
index 0000000..dc78c37
--- /dev/null
+++ b/lib/messages/commands/version.js
@@ -0,0 +1,100 @@
+'use strict';
+
+var Message = require('../message');
+var inherits = require('util').inherits;
+var bitcore = require('bitcore');
+var BufferWriter = bitcore.encoding.BufferWriter;
+var BufferReader = bitcore.encoding.BufferReader;
+var _ = bitcore.deps._;
+var BN = bitcore.crypto.BN;
+
+var utils = require('../utils');
+var magicNumber = bitcore.Networks.defaultNetwork.networkMagic.readUInt32LE(0);
+var protocolVersion = 70000;
+var packageInfo = require('../../../package.json');
+
+/**
+ * The version message is used on connection creation to advertise
+ * the type of node. The remote node will respond with its version, and no
+ * communication is possible until both peers have exchanged their versions.
+ * By default, bitcore advertises itself as named `bitcore:0.8`.
+ *
+ * @param{Object} obj - properties for the version
+ * @param{String} obj.subversion - version of the client
+ * @param{Buffer} obj.nonce - a random 8 byte buffer
+ */
+function VersionMessage(obj) {
+  /* jshint maxcomplexity: 10 */
+  Message.call(this, obj);
+  this.command = 'version';
+  _.assign(this, obj);
+  this.magicNumber = magicNumber;
+  this.nonce = this.nonce || utils.getNonce();
+  this.services = this.services || new BN(1, 10);
+  this.timestamp = this.timestamp || new Date();
+  this.version = this.version || protocolVersion;
+  this.subversion = this.subversion || '/bitcore:' + packageInfo.version + '/';
+  this.startHeight = this.startHeight || 0;
+};
+inherits(VersionMessage, Message);
+
+VersionMessage.fromObject = function(obj) {
+  return new VersionMessage(obj);
+};
+
+VersionMessage.fromBuffer = function(payload) {
+  var parser = new BufferReader(payload);
+  var obj = {};
+  obj.version = parser.readUInt32LE();
+  obj.services = parser.readUInt64LEBN();
+  obj.timestamp = new Date(parser.readUInt64LEBN().toNumber() * 1000);
+
+  obj.addrMe = {
+    services: parser.readUInt64LEBN(),
+    ip: utils.parseIP(parser),
+    port: parser.readUInt16BE()
+  };
+  obj.addrYou = {
+    services: parser.readUInt64LEBN(),
+    ip: utils.parseIP(parser),
+    port: parser.readUInt16BE()
+  };
+  obj.nonce = parser.read(8);
+  obj.subversion = parser.readVarLengthBuffer().toString();
+  obj.startHeight = parser.readUInt32LE();
+
+  if(parser.finished()) {
+    obj.relay = true;
+  } else {
+    obj.relay = !!parser.readUInt8();
+  }
+  utils.checkFinished(parser);
+
+  return VersionMessage.fromObject(obj);
+};
+
+VersionMessage.prototype.getPayload = function() {
+  var bw = new BufferWriter();
+  bw.writeUInt32LE(this.version);
+  bw.writeUInt64LEBN(this.services);
+
+  var timestampBuffer = new Buffer(Array(8));
+  timestampBuffer.writeUInt32LE(Math.round(this.timestamp.getTime() / 1000), 0);
+  bw.write(timestampBuffer);
+
+  utils.writeAddr(this.addrMe, bw);
+  utils.writeAddr(this.addrYou, bw);
+  bw.write(this.nonce);
+  bw.writeVarintNum(this.subversion.length);
+  bw.write(new Buffer(this.subversion, 'ascii'));
+  bw.writeUInt32LE(this.startHeight);
+  bw.writeUInt8(this.relay);
+
+  return bw.concat();
+};
+
+module.exports = function(options) {
+  magicNumber = options.magicNumber || magicNumber;
+  protocolVersion = options.protocolVersion || protocolVersion;
+  return VersionMessage;
+};
diff --git a/lib/messages/utils.js b/lib/messages/utils.js
new file mode 100644
index 0000000..b97fec8
--- /dev/null
+++ b/lib/messages/utils.js
@@ -0,0 +1,109 @@
+'use strict';
+
+var bitcore = require('bitcore');
+var BufferUtil = bitcore.util.buffer;
+var $ = bitcore.util.preconditions;
+var _ = bitcore.deps._;
+var utils;
+
+module.exports = utils = {
+  checkFinished: function checkFinished(parser) {
+    if(!parser.finished()) {
+      throw new Error('Data still available after parsing');
+    }
+  },
+  getNonce: function getNonce() {
+    return bitcore.crypto.Random.getRandomBuffer(8);
+  },
+  writeIP: function writeIP(ip, bw) {
+    var words = ip.v6.split(':').map(function(s) {
+      return new Buffer(s, 'hex');
+    });
+    for (var i = 0; i < words.length; i++) {
+      var word = words[i];
+      bw.write(word);
+    }
+  },
+  writeAddr: function writeAddr(addr, bw) {
+    if (_.isUndefined(addr)) {
+      var pad = new Buffer(Array(26));
+      bw.write(pad);
+      return;
+    }
+
+    bw.writeUInt64LEBN(addr.services);
+    utils.writeIP(addr.ip, bw);
+    bw.writeUInt16BE(addr.port);
+  },
+  writeInventory: function writeInventory(inventory, bw) {
+    bw.writeVarintNum(inventory.length);
+    inventory.forEach(function(value) {
+      bw.writeUInt32LE(value.type);
+      bw.write(value.hash);
+    });
+  },
+  parseIP: function parseIP(parser) {
+    var ipv6 = [];
+    var ipv4 = [];
+    for (var a = 0; a < 8; a++) {
+      var word = parser.read(2);
+      ipv6.push(word.toString('hex'));
+      if (a >= 6) {
+        ipv4.push(word[0]);
+        ipv4.push(word[1]);
+      }
+    }
+    ipv6 = ipv6.join(':');
+    ipv4 = ipv4.join('.');
+    return {
+      v6: ipv6,
+      v4: ipv4
+    };
+  },
+  parseAddr: function parseAddr(parser) {
+    var services = parser.readUInt64LEBN();
+    var ip = utils.parseIP(parser);
+    var port = parser.readUInt16BE();
+    return {
+      services: services,
+      ip: ip,
+      port: port
+    };
+  },
+  sanitizeStartStop: function sanitizeStartStop(obj) {
+    /* jshint maxcomplexity: 10 */
+    /* jshint maxstatements: 20 */
+    $.checkArgument(_.isUndefined(obj.starts) || _.isArray(obj.starts));
+    var starts = obj.starts;
+    var stop = obj.stop;
+    if (starts) {
+      starts = starts.map(function(hash) {
+        if (_.isString(hash)) {
+          return BufferUtil.reverse(new Buffer(hash, 'hex'));
+        } else {
+          return hash;
+        }
+      });
+    } else {
+      starts = [];
+    }
+
+    for (var i = 0; i < starts.length; i++) {
+      if (starts[i].length !== 32) {
+        throw new Error('Invalid hash ' + i + ' length: ' + starts[i].length);
+      }
+    }
+
+    stop = obj.stop;
+    if (_.isString(stop)) {
+      stop = BufferUtil.reverse(new Buffer(stop, 'hex'));
+    }
+    if (!stop) {
+      stop = BufferUtil.NULL_HASH;
+    }
+    obj.starts = starts;
+    obj.stop = stop;
+
+    return obj;
+  }
+};