diff --git a/lib/bcoin/peer.js b/lib/bcoin/peer.js
index 923b6626..1048c472 100644
--- a/lib/bcoin/peer.js
+++ b/lib/bcoin/peer.js
@@ -55,6 +55,9 @@ var constants = bcoin.protocol.constants;
  * @property {BN} challenge - Local nonce.
  * @property {Number} lastPong - Timestamp for last `pong`
  * received (unix time).
+ * @property {Number} lastPing - Timestamp for last `ping`
+ * sent (unix time).
+ * @property {Number} minPing - Lowest ping time seen.
  * @property {String} id - Peer's uid.
  * @property {Number} banScore
  * @emits Peer#ack
@@ -98,8 +101,10 @@ function Peer(pool, options) {
   this.localNonce = utils.nonce();
   this.filterRate = -1;
 
-  this.challenge = utils.nonce();
-  this.lastPong = 0;
+  this.challenge = null;
+  this.lastPong = -1;
+  this.lastPing = -1;
+  this.minPing = -1;
 
   this.banScore = 0;
 
@@ -132,7 +137,7 @@ function Peer(pool, options) {
 
   this.ping = {
     timer: null,
-    interval: this.options.pingInterval || 30000
+    interval: this.options.pingInterval || 120000
   };
 
   this.queue = {
@@ -186,13 +191,6 @@ Peer.prototype._init = function init() {
     self._error(err);
   });
 
-  this.ping.timer = setInterval(function() {
-    // self.challenge = utils.nonce();
-    self.write(self.framer.ping({
-      nonce: self.challenge
-    }));
-  }, this.ping.interval);
-
   this.request('verack', function(err, payload) {
     if (err) {
       self._error(err);
@@ -204,6 +202,10 @@ Peer.prototype._init = function init() {
     self.emit('ack');
     self.ts = utils.now();
 
+    self.ping.timer = setInterval(function() {
+      self.sendPing();
+    }, self.ping.interval);
+
     if (self.options.headers) {
       if (self.version && self.version.version > 70012)
         self.write(self.framer.sendHeaders());
@@ -259,12 +261,12 @@ Peer.prototype.createSocket = function createSocket(port, host) {
   }
 
   bcoin.debug(
-    'Connecting to %s:%d (priority=%s).',
+    'Connecting to %s (priority=%s).',
     hostname, this.priority);
 
   socket.once('connect', function() {
     bcoin.debug(
-      'Connected to %s:%d (priority=%s).',
+      'Connected to %s (priority=%s).',
       hostname, self.priority);
   });
 
@@ -314,6 +316,32 @@ Peer.prototype.sendInv = function sendInv(items) {
   this.write(this.framer.inv(items));
 };
 
+/**
+ * Send a `ping` packet.
+ */
+
+Peer.prototype.sendPing = function sendPing() {
+  if (!this.version)
+    return;
+
+  if (this.version.version <= 60000) {
+    this.write(this.framer.packet('ping', new Buffer([])));
+    return;
+  }
+
+  if (this.challenge) {
+    bcoin.debug('Peer has not responded to ping (%s).', this.hostname);
+    return;
+  }
+
+  this.lastPing = utils.ms();
+  this.challenge = utils.nonce();
+
+  this.write(this.framer.ping({
+    nonce: this.challenge
+  }));
+};
+
 /**
  * Test whether an is being watched by the peer.
  * @param {BroadcastItem|TX} item
@@ -367,8 +395,10 @@ Peer.prototype.destroy = function destroy() {
   this.socket = null;
   this.emit('close');
 
-  clearInterval(this.ping.timer);
-  this.ping.timer = null;
+  if (this.ping.timer) {
+    clearInterval(this.ping.timer);
+    this.ping.timer = null;
+  }
 
   Object.keys(this.requests.map).forEach(function(cmd) {
     var queue = this.requests.map[cmd];
@@ -1220,19 +1250,40 @@ Peer.prototype._handleAddr = function handleAddr(addrs) {
 };
 
 Peer.prototype._handlePing = function handlePing(data) {
-  this.write(this.framer.pong({
-    nonce: data.nonce
-  }));
-  this.emit('ping', data);
+  this.write(this.framer.pong(data));
+  this.emit('ping', this.minPing);
 };
 
 Peer.prototype._handlePong = function handlePong(data) {
-  if (!this.challenge || this.challenge.cmp(data.nonce) !== 0)
-    return this.emit('pong', false);
+  var now = utils.ms();
 
-  this.lastPong = utils.now();
+  if (!this.challenge) {
+    bcoin.debug('Peer sent an unsolicited pong (%s).', this.hostname);
+    return;
+  }
 
-  return this.emit('pong', true);
+  if (data.nonce.cmp(this.challenge) !== 0) {
+    if (data.nonce.cmpn(0) === 0) {
+      bcoin.debug('Peer sent a zero nonce (%s).', this.hostname);
+      this.challenge = null;
+      return;
+    }
+    bcoin.debug('Peer sent the wrong nonce (%s).', this.hostname);
+    return;
+  }
+
+  if (now >= this.lastPing) {
+    this.lastPong = now;
+    if (this.minPing === -1)
+      this.minPing = now - this.lastPing;
+    this.minPing = Math.min(this.minPing, now - this.lastPing);
+  } else {
+    bcoin.debug('Timing mismatch (what?) (%s).', this.hostname);
+  }
+
+  this.challenge = null;
+
+  this.emit('pong', this.minPing);
 };
 
 Peer.prototype._handleGetAddr = function handleGetAddr() {
@@ -1445,6 +1496,7 @@ Peer.prototype.inspect = function inspect() {
     + ' id=' + this.id
     + ' connected=' + this.connected
     + ' host=' + this.hostname
+    + ' ping=' + this.minPing
     + '>';
 };
 
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 063b950f..f75e9a37 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -868,17 +868,15 @@ utils.parseHost = function parseHost(addr) {
 
 /**
  * Concatenate a host and port.
- * @param {Seed} seed
+ * @param {String} host
+ * @param {Number} port
  * @returns {String}
  */
 
-utils.hostname = function hostname(seed) {
-  var host = seed.host;
-
+utils.hostname = function hostname(host, port) {
   if (utils.isIP(host) === 6)
     host = '[' + host + ']';
-
-  return host + ':' + seed.port;
+  return host + ':' + port;
 };
 
 /**
@@ -1283,7 +1281,16 @@ utils.testTarget = function testTarget(hash, target) {
  */
 
 utils.now = function now() {
-  return +new Date() / 1000 | 0;
+  return Math.floor(+new Date() / 1000);
+};
+
+/**
+ * Get current time in unix time (milliseconds).
+ * @returns {Number}
+ */
+
+utils.ms = function ms() {
+  return +new Date();
 };
 
 /**