diff --git a/lib/bcoin/peer.js b/lib/bcoin/peer.js
index 818e8172..e1059b02 100644
--- a/lib/bcoin/peer.js
+++ b/lib/bcoin/peer.js
@@ -8,6 +8,7 @@ var inherits = require('inherits');
 var EventEmitter = require('events').EventEmitter;
 
 var bcoin = require('../bcoin');
+var bn = require('bn.js');
 var utils = bcoin.utils;
 var assert = utils.assert;
 var constants = bcoin.protocol.constants;
@@ -46,6 +47,9 @@ function Peer(pool, createSocket, options) {
   this.host = null;
   this.port = 0;
 
+  this.challenge = null;
+  this.lastPong = 0;
+
   if (this.options.backoff) {
     setTimeout(function() {
       self.socket = createSocket(self, pool);
@@ -135,10 +139,10 @@ Peer.prototype._init = function init() {
   }
 
   this._ping.timer = setInterval(function() {
-    self._write(self.framer.ping([
-      0xde, 0xad, 0xbe, 0xef,
-      0xde, 0xad, 0xbe, 0xef
-    ]));
+    self.challenge = self._nonce();
+    self._write(self.framer.ping({
+      nonce: self.challenge
+    }));
   }, this._ping.interval);
 
   // Send hello
@@ -441,12 +445,20 @@ Peer.prototype._handleAddr = function handleAddr(addrs) {
   }, this);
 };
 
-Peer.prototype._handlePing = function handlePing() {
-  // No-op for now
+Peer.prototype._handlePing = function handlePing(data) {
+  this._write(this.framer.pong({
+    nonce: data.nonce
+  }));
+  this.emit('ping', data);
 };
 
-Peer.prototype._handlePong = function handlePong() {
-  // No-op for now
+Peer.prototype._handlePong = function handlePong(data) {
+  if (!this.challenge || this.challenge.cmp(data.nonce) !== 0)
+    return this.emit('pong', false);
+
+  this.lastPong = utils.now();
+
+  return this.emit('pong', true);
 };
 
 Peer.prototype._handleGetAddr = function handleGetAddr() {
@@ -586,6 +598,14 @@ Peer.prototype.reject = function reject(details) {
   this._write(this.framer.reject(details));
 };
 
+Peer.nonce = new bn(0xffffffff).ushln(32).uor(new bn(0xffffffff));
+
+Peer.prototype._nonce = function _nonce() {
+  var nonce = Peer.nonce.clone();
+  nonce.imuln(Math.random());
+  return nonce;
+};
+
 /**
  * Expose
  */
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index bd1c21cd..547948ec 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -667,10 +667,15 @@ Pool.prototype._createPeer = function _createPeer(backoff) {
   });
 
   peer.on('reject', function(payload) {
+    payload.data = utils.toHex(payload.data);
+
     self.emit('debug',
       'Reject: msg=%s ccode=%s reason=%s data=%s',
-      payload.message, payload.ccode, payload.reason,
-      utils.toHex(payload.data));
+      payload.message,
+      payload.ccode,
+      payload.reason,
+      payload.data);
+
     self.emit('reject', payload, peer);
   });
 
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index fa7faed9..0bc24bb9 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -158,12 +158,16 @@ Framer.prototype.notFound = function notFound(items) {
   return this._inv('notfound', items);
 };
 
-Framer.prototype.ping = function ping(nonce) {
-  return this.packet('ping', nonce);
+Framer.prototype.ping = function ping(data) {
+  var p = [];
+  utils.writeU64(p, data.nonce, 0);
+  return this.packet('ping', p);
 };
 
-Framer.prototype.pong = function pong(nonce) {
-  return this.packet('pong', nonce.slice(0, 8));
+Framer.prototype.pong = function pong(data) {
+  var p = [];
+  utils.writeU64(p, data.nonce, 0);
+  return this.packet('pong', p);
 };
 
 Framer.prototype.filterLoad = function filterLoad(bloom, update) {
diff --git a/lib/bcoin/protocol/parser.js b/lib/bcoin/protocol/parser.js
index 084abfe2..ff9138e4 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -139,9 +139,33 @@ Parser.prototype.parsePayload = function parsePayload(cmd, p) {
   if (cmd === 'addr')
     return this.parseAddr(p);
 
+  if (cmd === 'ping')
+    return this.parsePing(p);
+
+  if (cmd === 'pong')
+    return this.parsePong(p);
+
   return p;
 };
 
+Parser.prototype.parsePing = function parsePing(p) {
+  if (p.length < 8)
+    return this._error('pong packet is too small');
+
+  return {
+    nonce: readU64(p, 0)
+  };
+};
+
+Parser.prototype.parsePong = function parsePong(p) {
+  if (p.length < 8)
+    return this._error('ping packet is too small');
+
+  return {
+    nonce: readU64(p, 0)
+  };
+};
+
 Parser.prototype.parseVersion = function parseVersion(p) {
   var v, services, ts, nonce, result, off, agent, height, relay;
 
@@ -152,10 +176,10 @@ Parser.prototype.parseVersion = function parseVersion(p) {
   services = readU64(p, 4);
 
   // Timestamp
-  ts = readU64(p, 12);
+  ts = utils.read64(p, 12);
 
   // Nonce, very dramatic
-  nonce = { lo: readU32(p, 72), hi: readU32(p, 76) };
+  nonce = readU64(p, 72);
 
   // User agent length
   result = utils.readIntv(p, 80);
@@ -356,7 +380,7 @@ Parser.prototype.parseTXOut = function parseTXOut(p) {
 
   return {
     size: off + scriptLen,
-    value: new bn(utils.toArray(p.slice(0, 8)).reverse()),
+    value: utils.read64(p, 0),
     script: bcoin.script.decode(utils.toArray(p.slice(off, off + scriptLen)))
   };
 };
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index aa3b118e..4a838c35 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -1288,7 +1288,7 @@ TX.prototype.toRaw = function toRaw(enc) {
 TX.fromRaw = function fromRaw(raw, enc) {
   if (enc === 'hex')
     raw = utils.toArray(raw, 'hex');
-  return new bcoin.protocol.parser().parseTX(raw);
+  return new bcoin.tx(new bcoin.protocol.parser().parseTX(raw));
 };
 
 /**
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index e08edbe8..70167746 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -188,134 +188,6 @@ utils.dsha256 = function dsha256(data, enc) {
   return utils.sha256(utils.sha256(data, enc));
 };
 
-utils.readU16 = function readU16(arr, off) {
-  if (!off)
-    off = 0;
-  return arr[off] | (arr[off + 1] << 8);
-};
-
-utils.readU32 = function readU32(arr, off) {
-  if (!off)
-    off = 0;
-
-  var r = arr[off]
-    | (arr[off + 1] << 8)
-    | (arr[off + 2] << 16)
-    | (arr[off + 3] << 24);
-
-  if (r < 0)
-    r += 0x100000000;
-
-  return r;
-};
-
-utils.readU64 = function readU64(arr, off) {
-  if (!off)
-    off = 0;
-  return utils.readU32(arr, off) + utils.readU32(arr, off + 4) * 0x100000000;
-};
-
-utils.writeU16 = function writeU16(dst, num, off) {
-  if (!off)
-    off = 0;
-  dst[off] = num & 0xff;
-  dst[off + 1] = (num >>> 8) & 0xff;
-  return 2;
-};
-
-utils.writeU32 = function writeU32(dst, num, off) {
-  if (!off)
-    off = 0;
-  dst[off] = num & 0xff;
-  dst[off + 1] = (num >>> 8) & 0xff;
-  dst[off + 2] = (num >>> 16) & 0xff;
-  dst[off + 3] = (num >>> 24) & 0xff;
-  return 4;
-};
-
-utils.writeU64 = function writeU64(dst, num, off) {
-  var i = 0;
-
-  if (!off)
-    off = 0;
-
-  num = new bn(num).maskn(64).toArray();
-  while (num.length < 8)
-    num.unshift(0);
-
-  num.reverse().forEach(function(ch) {
-    dst[off++] = ch;
-  });
-
-  i = num.length;
-
-  while (i--)
-    dst[off++] = num[i];
-
-  return 8;
-};
-
-utils.writeU16BE = function writeU16BE(dst, num, off) {
-  if (!off)
-    off = 0;
-  dst[off] = (num >>> 8) & 0xff;
-  dst[off + 1] = num & 0xff;
-  return 2;
-};
-
-utils.writeU32BE = function writeU32BE(dst, num, off) {
-  if (!off)
-    off = 0;
-  dst[off] = (num >>> 24) & 0xff;
-  dst[off + 1] = (num >>> 16) & 0xff;
-  dst[off + 2] = (num >>> 8) & 0xff;
-  dst[off + 3] = num & 0xff;
-  return 4;
-};
-
-utils.writeU64BE = function writeU64BE(dst, num, off) {
-  var i = 0;
-
-  if (!off)
-    off = 0;
-
-  num = new bn(num).maskn(64).toArray();
-  while (num.length < 8)
-    num.unshift(0);
-
-  for (; i < num.length; i++)
-    dst[off++] = num[i];
-
-  return 8;
-};
-
-utils.readU16BE = function readU16BE(arr, off) {
-  if (!off)
-    off = 0;
-  return (arr[off] << 8) | arr[off + 1];
-};
-
-utils.readU32BE = function readU32BE(arr, off) {
-  if (!off)
-    off = 0;
-
-  var r = (arr[off] << 24)
-    | (arr[off + 1] << 16)
-    | (arr[off + 2] << 8)
-    | arr[off + 3];
-
-  if (r < 0)
-    r += 0x100000000;
-
-  return r;
-};
-
-utils.readU64BE = function readU64BE(arr, off) {
-  if (!off)
-    off = 0;
-  return utils.readU32BE(arr, off) * 0x100000000 + utils.readU32BE(arr, off + 4);
-};
-
 utils.writeAscii = function writeAscii(dst, str, off) {
   var i = 0;
   var c;
@@ -660,10 +532,10 @@ utils.isIP = function isIP(ip) {
   if (typeof ip !== 'string')
     return 0;
 
-  if (~ip.indexOf('.'))
+  if (ip.indexOf('.') !== -1)
     return 4;
 
-  if (~ip.indexOf(':'))
+  if (ip.indexOf(':') !== -1)
     return 6;
 
   return 0;
@@ -759,65 +631,12 @@ utils.sortKeys = function sortKeys(keys) {
   });
 };
 
-utils.readIntv = function readIntv(p, off) {
-  var r, bytes;
-
-  if (!off)
-    off = 0;
-
-  if (p[off] < 0xfd) {
-    r = p[off];
-    bytes = 1;
-  } else if (p[off] === 0xfd) {
-    r = p[off + 1] | (p[off + 2] << 8);
-    bytes = 3;
-  } else if (p[off] === 0xfe) {
-    r = utils.readU32(p, off + 1);
-    bytes = 5;
-  } else {
-    r = 0;
-    bytes = 9;
-  }
-
-  return { off: off + bytes, r: r };
-};
-
-utils.writeIntv = function writeIntv(arr, value, off) {
-  if (!off)
-    off = 0;
-
-  if (value < 0xfd) {
-    arr[off] = value;
-    return 1;
-  }
-
-  if (value <= 0xffff) {
-    arr[off] = 0xfd;
-    arr[off + 1] = value & 0xff;
-    arr[off + 2] = value >>> 8;
-    return 3;
-  }
-
-  if (value <= 0xffffffff) {
-    arr[off] = 0xfe;
-    arr[off + 1] = value & 0xff;
-    arr[off + 2] = (value >>> 8) & 0xff;
-    arr[off + 3] = (value >>> 16) & 0xff;
-    arr[off + 4] = value >>> 24;
-    return 5;
-  }
-
-  arr[off] = 0xff;
-  utils.writeU64(arr, value, off + 1);
-  return 9;
-};
-
 utils.uniq = function(obj) {
   var out = [];
   var i = 0;
 
   for (; i < obj.length; i++) {
-    if (!~out.indexOf(obj[i]))
+    if (out.indexOf(obj[i]) === -1)
       out.push(obj[i]);
   }
 
@@ -917,3 +736,406 @@ utils.hash = function hash(obj, enc) {
 
   throw new Error('Cannot get hash of object');
 };
+
+//
+// Integer Functions
+//
+// Non-64-bit functions originally taken from the node.js tree:
+//
+// Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+utils.readU8 = function readU8(arr, off) {
+  off = off >>> 0;
+  return arr[off];
+};
+
+utils.readU16 = function readU16(arr, off) {
+  off = off >>> 0;
+  return arr[off] | (arr[off + 1] << 8);
+};
+
+utils.readU16BE = function readU16BE(arr, off) {
+  off = off >>> 0;
+  return (arr[off] << 8) | arr[off + 1];
+};
+
+utils.readU32 = function readU32(arr, off) {
+  off = off >>> 0;
+
+  return ((arr[off])
+    | (arr[off + 1] << 8)
+    | (arr[off + 2] << 16))
+    + (arr[off + 3] * 0x1000000);
+};
+
+utils.readU32BE = function readU32BE(arr, off) {
+  off = off >>> 0;
+
+  return (arr[off] * 0x1000000)
+    + ((arr[off + 1] << 16)
+    | (arr[off + 2] << 8)
+    | arr[off + 3]);
+};
+
+utils.readU64 = function readU64(arr, off) {
+  var num;
+  off = off >>> 0;
+  num = utils.toArray(arr.slice(off, off + 8)).reverse();
+  return new bn(num);
+};
+
+utils.readU64BE = function readU64BE(arr, off) {
+  var num;
+  off = off >>> 0;
+  num = utils.toArray(arr.slice(off, off + 8));
+  return new bn(num);
+};
+
+utils.read8 = function read8(arr, off) {
+  var num;
+  off = off >>> 0;
+  num = arr[off];
+  return !(num & 0x80) ? num : (0xff - num + 1) * -1;
+};
+
+utils.read16 = function read16(arr, off) {
+  var num;
+  off = off >>> 0;
+  num = arr[off] | (arr[off + 1] << 8);
+  return (num & 0x8000) ? num | 0xffff0000 : num;
+};
+
+utils.read16BE = function read16BE(arr, off) {
+  var num;
+  off = off >>> 0;
+  num = arr[off + 1] | (arr[off] << 8);
+  return (num & 0x8000) ? num | 0xffff0000 : num;
+};
+
+utils.read32 = function read32(arr, off) {
+  off = off >>> 0;
+
+  return (arr[off])
+    | (arr[off + 1] << 8)
+    | (arr[off + 2] << 16)
+    | (arr[off + 3] << 24);
+};
+
+utils.read32BE = function read32BE(arr, off) {
+  off = off >>> 0;
+
+  return (arr[off] << 24)
+    | (arr[off + 1] << 16)
+    | (arr[off + 2] << 8)
+    | (arr[off + 3]);
+};
+
+utils.read64 = function read64(arr, off) {
+  var num;
+
+  off = off >>> 0;
+
+  num = utils.toArray(arr.slice(off, off + 8)).reverse();
+
+  if (num[0] & 0x80) {
+    num[0] &= ~0x80;
+    num = new bn(num);
+    num = num.neg();
+    return num;
+  }
+
+  return new bn(num);
+};
+
+utils.read64BE = function read64BE(arr, off) {
+  var num;
+
+  off = off >>> 0;
+
+  num = utils.toArray(arr.slice(off, off + 8));
+
+  if (num[0] & 0x80) {
+    num[0] &= ~0x80;
+    num = new bn(num);
+    num = num.neg();
+    return num;
+  }
+
+  return new bn(num);
+};
+
+utils.writeU8 = function readU8(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = num & 0xff;
+  return 1;
+};
+
+utils.writeU16 = function readU16(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = num & 0xff;
+  dst[off + 1] = (num >>> 8) & 0xff;
+  return 2;
+};
+
+utils.writeU16BE = function read16BE(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = (num >>> 8) & 0xff;
+  dst[off + 1] = num & 0xff;
+  return 2;
+};
+
+utils.writeU32 = function writeU32(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off + 3] = (num >>> 24) & 0xff;
+  dst[off + 2] = (num >>> 16) & 0xff;
+  dst[off + 1] = (num >>> 8) & 0xff;
+  dst[off] = num & 0xff;
+  return 4;
+};
+
+utils.writeU32BE = function writeU32BE(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = (num >>> 24) & 0xff;
+  dst[off + 1] = (num >>> 16) & 0xff;
+  dst[off + 2] = (num >>> 8) & 0xff;
+  dst[off + 3] = num & 0xff;
+  return 4;
+};
+
+utils.writeU64 = function writeU64(dst, num, off) {
+  var i;
+
+  if (!(num instanceof bn)) {
+    num = +num;
+    num = new bn(num);
+  }
+
+  off = off >>> 0;
+
+  num = num.maskn(64).toArray();
+
+  while (num.length < 8)
+    num.unshift(0);
+
+  for (i = num.length - 1; i >= 0; i--)
+    dst[off++] = num[i] & 0xff;
+
+  return 8;
+};
+
+utils.writeU64BE = function writeU64BE(dst, num, off) {
+  var i;
+
+  if (!(num instanceof bn)) {
+    num = +num;
+    bn = new bn(num);
+  }
+
+  off = off >>> 0;
+
+  num = num.maskn(64).toArray();
+
+  while (num.length < 8)
+    num.unshift(0);
+
+  for (i = 0; i < num.length; i++)
+    dst[off++] = num[i] & 0xff;
+
+  return 8;
+};
+
+utils.write8 = function write8(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = num & 0xff;
+  return 1;
+};
+
+utils.write16 = function write16(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = num & 0xff;
+  dst[off + 1] = (num >>> 8) & 0xff;
+  return 2;
+};
+
+utils.write16BE = function write16BE(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = (num >>> 8) & 0xff;
+  dst[off + 1] = num & 0xff;
+  return 2;
+};
+
+utils.write32 = function write32(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = num & 0xff;
+  dst[off + 1] = (num >>> 8) & 0xff;
+  dst[off + 2] = (num >>> 16) & 0xff;
+  dst[off + 3] = (num >>> 24) & 0xff;
+  return 4;
+};
+
+utils.write32BE = function write32BE(dst, num, off) {
+  num = +num;
+  off = off >>> 0;
+  dst[off] = (num >>> 24) & 0xff;
+  dst[off + 1] = (num >>> 16) & 0xff;
+  dst[off + 2] = (num >>> 8) & 0xff;
+  dst[off + 3] = num & 0xff;
+  return 4;
+};
+
+utils.write64 = function write64(dst, num, off) {
+  var i;
+
+  if (!(num instanceof bn)) {
+    num = +num;
+    if (num < 0) {
+      num &= ~0x80000000;
+      num = new bn(num);
+      num = num.neg();
+    } else {
+      num = new bn(num);
+    }
+  }
+
+  off = off >>> 0;
+
+  num = num.maskn(64).toArray();
+
+  while (num.length < 8)
+    num.unshift(0);
+
+  if (num.isNeg())
+    num[0] |= 0x80;
+
+  for (i = num.length - 1; i >= 0; i--)
+    dst[off++] = num[i] & 0xff;
+
+  return 8;
+};
+
+utils.write64BE = function write64BE(dst, num, off) {
+  var i;
+
+  if (!(num instanceof bn)) {
+    num = +num;
+    if (num < 0) {
+      num &= ~0x80000000;
+      num = new bn(num);
+      num = num.neg();
+    } else {
+      num = new bn(num);
+    }
+  }
+
+  off = off >>> 0;
+
+  num = num.maskn(64).toArray();
+
+  while (num.length < 8)
+    num.unshift(0);
+
+  if (num.isNeg())
+    num[0] |= 0x80;
+
+  for (i = 0; i < num.length; i++)
+    dst[off++] = num[i] & 0xff;
+
+  return 8;
+};
+
+utils.readIntv = function readIntv(arr, off) {
+  var r, bytes;
+
+  off = off >>> 0;
+
+  if (arr[off] < 0xfd) {
+    r = arr[off];
+    bytes = 1;
+  } else if (arr[off] === 0xfd) {
+    r = arr[off + 1] | (arr[off + 2] << 8);
+    bytes = 3;
+  } else if (arr[off] === 0xfe) {
+    r = utils.readU32(arr, off + 1);
+    bytes = 5;
+  } else if (arr[off] === 0xff) {
+    try {
+      r = utils.readU64(arr, off + 1).toNumber();
+    } catch (e) {
+      r = 0;
+    }
+    bytes = 9;
+  } else {
+    // Malformed
+    r = arr[off];
+    bytes = 1;
+  }
+
+  return { off: off + bytes, r: r };
+};
+
+utils.writeIntv = function writeIntv(dst, num, off) {
+  off = off >>> 0;
+
+  if (num instanceof bn) {
+    if (num.cmpn(0xffffffff) > 0) {
+      dst[off] = 0xff;
+      utils.writeU64(dst, num, off + 1);
+      return 9;
+    }
+    num = num.toNumber();
+  }
+
+  num = +num;
+
+  if (num < 0xfd) {
+    dst[off] = num & 0xff;
+    return 1;
+  }
+
+  if (num <= 0xffff) {
+    dst[off] = 0xfd;
+    dst[off + 1] = num & 0xff;
+    dst[off + 2] = (num >>> 8) & 0xff;
+    return 3;
+  }
+
+  if (num <= 0xffffffff) {
+    dst[off] = 0xfe;
+    dst[off + 1] = num & 0xff;
+    dst[off + 2] = (num >>> 8) & 0xff;
+    dst[off + 3] = (num >>> 16) & 0xff;
+    dst[off + 4] = (num >>> 24) & 0xff;
+    return 5;
+  }
+
+  dst[off] = 0xff;
+  utils.writeU64(dst, num, off + 1);
+  return 9;
+};