diff --git a/.jshintrc b/.jshintrc
index 787e816d..cf7ce01d 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -8,7 +8,7 @@
   "noarg": true,
   "shadow": "inner",
   "undef": true,
-  "unused": true,
+  "unused": "vars",
 
   "boss": true,
   "expr": true,
@@ -21,10 +21,11 @@
   "-W018": true,
   "-W064": true,
   "-W086": true,
-  "+W032": true,
+  "-W032": true,
+  "-W021": true,
 
-  "browser": false,
-  "browserify": false,
+  "browser": true,
+  "browserify": true,
   "node": true,
   "nonstandard": true,
   "typed": true,
diff --git a/lib/bcoin/address.js b/lib/bcoin/address.js
index e1229c9e..70c919f2 100644
--- a/lib/bcoin/address.js
+++ b/lib/bcoin/address.js
@@ -6,8 +6,6 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
-var constants = bcoin.protocol.constants;
 var networks = bcoin.protocol.network;
 var utils = require('./utils');
 var assert = utils.assert;
@@ -146,7 +144,7 @@ Address.toBase58 = function toBase58(hash, type, version, network) {
   p.writeU8(prefix);
   if (version != null) {
     p.writeU8(version);
-    p.writeU8(0)
+    p.writeU8(0);
   }
   p.writeBytes(hash);
   p.writeChecksum();
@@ -162,7 +160,7 @@ Address.toBase58 = function toBase58(hash, type, version, network) {
  */
 
 Address.parseBase58 = function parseBase58(address) {
-  var i, prefix, type, version, hash, network;
+  var i, prefix, type, version, hash, network, p;
 
   if (!Buffer.isBuffer(address))
     address = utils.fromBase58(address);
@@ -222,7 +220,7 @@ Address.fromBase58 = function fromBase58(address) {
  */
 
 Address.parseScript = function parseScript(script) {
-  var program;
+  var program, hash;
 
   if (script.isWitnessProgram()) {
     program = script.getWitnessProgram();
diff --git a/lib/bcoin/aes.js b/lib/bcoin/aes.js
index 6c94b94d..2f27c56d 100644
--- a/lib/bcoin/aes.js
+++ b/lib/bcoin/aes.js
@@ -8,6 +8,8 @@
  * Entered into the public domain by Vincent Rijmen.
  */
 
+/* jshint latedef: false */
+
 var assert = require('assert');
 
 /**
diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index 628e5a84..c5291f88 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -6,13 +6,9 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
 var utils = require('./utils');
 var assert = utils.assert;
 var constants = bcoin.protocol.constants;
-var network = bcoin.protocol.network;
-var BufferWriter = require('./writer');
-var BufferReader = require('./reader');
 
 /**
  * Represents a full block.
@@ -39,7 +35,7 @@ var BufferReader = require('./reader');
  */
 
 function Block(data) {
-  var i, tx;
+  var i;
 
   if (!(this instanceof Block))
     return new Block(data);
diff --git a/lib/bcoin/bloom.js b/lib/bcoin/bloom.js
index 7d3c6912..9f7412ba 100644
--- a/lib/bcoin/bloom.js
+++ b/lib/bcoin/bloom.js
@@ -43,7 +43,7 @@ function Bloom(size, n, tweak, update) {
     this.reset();
   }
 
-  if (tweak == null || tweak == -1)
+  if (tweak == null || tweak === -1)
     tweak = (Math.random() * 0x100000000) >>> 0;
 
   if (update == null || update === -1)
@@ -248,7 +248,7 @@ RollingFilter.prototype.reset = function reset() {
  */
 
 RollingFilter.prototype.add = function add(val, enc) {
-  var i, j, hash, bits, pos, pos1, pos2, bit, oct;
+  var i, hash, bits, pos, pos1, pos2, bit, oct;
   var m1, m2, v1, v2, mhi, mlo;
 
   if (typeof val === 'string')
diff --git a/lib/bcoin/bst.js b/lib/bcoin/bst.js
index f4a10fa7..33977ae7 100644
--- a/lib/bcoin/bst.js
+++ b/lib/bcoin/bst.js
@@ -5,7 +5,6 @@
  * https://github.com/indutny/bcoin
  */
 
-var bcoin = require('./env');
 var utils = require('./utils');
 var assert = utils.assert;
 var DUMMY = new Buffer([0]);
@@ -112,7 +111,7 @@ BST.prototype.insert = function insert(key, value) {
 BST.prototype.remove = function remove(key) {
   var current = this.root;
   var left = false;
-  var parent, use;
+  var cmp, parent, use;
 
   if (typeof key === 'string')
     key = new Buffer(key, 'ascii');
@@ -426,8 +425,6 @@ BST.prototype.get = function get(key, options, callback) {
  */
 
 BST.prototype.put = function put(key, value, options, callback) {
-  var item;
-
   if (!callback) {
     callback = options;
     options = null;
@@ -449,8 +446,6 @@ BST.prototype.put = function put(key, value, options, callback) {
  */
 
 BST.prototype.del = function del(key, options, callback) {
-  var item;
-
   if (!callback) {
     callback = options;
     options = null;
@@ -690,7 +685,7 @@ Iterator.prototype.seek = function seek(key) {
     this.index += 1;
 };
 
-Iterator.prototype._end = function end(callback) {
+Iterator.prototype._end = function end() {
   if (!this.tree)
     return;
 
diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index baa33736..7a8e7255 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -348,7 +348,7 @@ Chain.prototype._preload = function _preload(callback) {
     stream.on('data', function(data) {
       var blocks = [];
       var need = 80 - buf.size;
-      var lastEntry, block, data, entry;
+      var i, lastEntry, block, entry;
 
       while (data.length >= need) {
         buf.data.push(data.slice(0, need));
@@ -441,7 +441,7 @@ Chain.prototype._verifyContext = function _verifyContext(block, prev, callback)
     if (err)
       return callback(err);
 
-    self._checkDuplicates(block, prev, function(err, result) {
+    self._checkDuplicates(block, prev, function(err) {
       if (err)
         return callback(err);
 
diff --git a/lib/bcoin/chaindb.js b/lib/bcoin/chaindb.js
index 5750f9bf..e43a4d92 100644
--- a/lib/bcoin/chaindb.js
+++ b/lib/bcoin/chaindb.js
@@ -445,7 +445,6 @@ ChainDB.prototype.get = function get(hash, callback) {
  */
 
 ChainDB.prototype.save = function save(entry, block, connect, callback) {
-  var self = this;
   var batch, hash, height;
 
   callback = utils.ensure(callback);
@@ -515,7 +514,6 @@ ChainDB.prototype.getTip = function getTip(callback) {
  */
 
 ChainDB.prototype.connect = function connect(entry, block, callback) {
-  var self = this;
   var batch = this.db.batch();
   var hash = new Buffer(entry.hash, 'hex');
 
@@ -725,8 +723,6 @@ ChainDB.prototype.has = function has(height, callback) {
  */
 
 ChainDB.prototype.saveBlock = function saveBlock(block, batch, connect, callback) {
-  var i, j, tx, hash, addresses, address;
-
   if (this.options.spv)
     return utils.nextTick(callback);
 
@@ -748,7 +744,6 @@ ChainDB.prototype.saveBlock = function saveBlock(block, batch, connect, callback
 
 ChainDB.prototype.removeBlock = function removeBlock(hash, batch, callback) {
   var self = this;
-  var i, tx;
 
   if (this.options.spv)
     return utils.nextTick(callback);
@@ -1133,6 +1128,10 @@ ChainDB.prototype.getCoinsByAddress = function getCoinsByAddress(addresses, call
       coins = coins.concat(coin);
       next();
     });
+  }, function(err) {
+    if (err)
+      return callback(err);
+    return callback(null, coins);
   });
 };
 
@@ -1250,8 +1249,6 @@ ChainDB.prototype._ensureBlock = function _ensureBlock(hash, callback) {
 };
 
 ChainDB.prototype._ensureHistory = function _ensureHistory(hash, callback) {
-  var self = this;
-
   if (hash instanceof bcoin.block)
     return utils.asyncify(callback)(null, hash);
 
@@ -1429,7 +1426,7 @@ ChainDB.prototype.isSpentTX = function isSpentTX(hash, callback) {
 };
 
 ChainDB.prototype._pruneBlock = function _pruneBlock(block, batch, callback) {
-  var futureHeight, i, j, key, tx, input;
+  var futureHeight, key;
 
   if (this.options.spv)
     return callback();
diff --git a/lib/bcoin/coin.js b/lib/bcoin/coin.js
index e1974c0f..ef1d2da5 100644
--- a/lib/bcoin/coin.js
+++ b/lib/bcoin/coin.js
@@ -6,7 +6,6 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
 var utils = require('./utils');
 var assert = utils.assert;
 
diff --git a/lib/bcoin/coins.js b/lib/bcoin/coins.js
index 98d09438..75e5433c 100644
--- a/lib/bcoin/coins.js
+++ b/lib/bcoin/coins.js
@@ -7,8 +7,6 @@
 
 var bcoin = require('./env');
 var utils = bcoin.utils;
-var assert = utils.assert;
-var constants = bcoin.protocol.constants;
 var BufferReader = require('./reader');
 var BufferWriter = require('./writer');
 
diff --git a/lib/bcoin/coinview.js b/lib/bcoin/coinview.js
index 76507cfd..26df58f3 100644
--- a/lib/bcoin/coinview.js
+++ b/lib/bcoin/coinview.js
@@ -6,9 +6,6 @@
  */
 
 var bcoin = require('./env');
-var utils = bcoin.utils;
-var assert = utils.assert;
-var constants = bcoin.protocol.constants;
 
 /**
  * A collections of {@link Coins} objects.
diff --git a/lib/bcoin/compactblock.js b/lib/bcoin/compactblock.js
index a45da193..7ae2d28c 100644
--- a/lib/bcoin/compactblock.js
+++ b/lib/bcoin/compactblock.js
@@ -6,9 +6,7 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
 var utils = require('./utils');
-var assert = utils.assert;
 
 /**
  * A block object which is essentially a "placeholder"
diff --git a/lib/bcoin/ec.js b/lib/bcoin/ec.js
index e6f99de7..f8a04b43 100644
--- a/lib/bcoin/ec.js
+++ b/lib/bcoin/ec.js
@@ -6,6 +6,7 @@
  */
 
 var elliptic = require('elliptic');
+var bn = require('bn.js');
 var utils = require('./utils');
 var assert = utils.assert;
 var crypto, secp256k1;
diff --git a/lib/bcoin/env.js b/lib/bcoin/env.js
index 55f1b398..3e5e2dd4 100644
--- a/lib/bcoin/env.js
+++ b/lib/bcoin/env.js
@@ -6,7 +6,6 @@
  */
 
 var utils = require('./utils');
-var assert = utils.assert;
 var fs;
 
 if (!utils.isBrowser)
diff --git a/lib/bcoin/hd.js b/lib/bcoin/hd.js
index dc612cfa..9fccf681 100644
--- a/lib/bcoin/hd.js
+++ b/lib/bcoin/hd.js
@@ -589,8 +589,6 @@ HDPrivateKey.prototype.deriveAccount44 = function deriveAccount44(accountIndex)
  */
 
 HDPrivateKey.prototype.derivePurpose45 = function derivePurpose45() {
-  var child;
-
   if (this instanceof HDPublicKey) {
     assert(this.isPurpose45(), 'Cannot derive purpose 45.');
     return this;
diff --git a/lib/bcoin/http/base.js b/lib/bcoin/http/base.js
index cda1d83b..cd431716 100644
--- a/lib/bcoin/http/base.js
+++ b/lib/bcoin/http/base.js
@@ -69,19 +69,18 @@ HTTPBase.prototype._init = function _init() {
 
 HTTPBase.prototype._initIO = function _initIO() {
   var self = this;
-  var io;
+  var IOServer;
 
-  return;
   try {
-    io = require('socket.io');
+    IOServer = require('socket.io');
   } catch (e) {
     ;
   }
 
-  if (!io)
+  if (!IOServer)
     return;
 
-  this.io = new io.Server();
+  this.io = new IOServer();
 
   this.io.attach(this.server);
 
@@ -494,10 +493,6 @@ function parsePath(req) {
   }
 }
 
-function escape(str) {
-  return encodeURIComponent(str).replace(/%20/g, '+');
-}
-
 function unescape(str) {
   try {
     str = decodeURIComponent(str).replace(/\+/g, ' ');
diff --git a/lib/bcoin/http/client.js b/lib/bcoin/http/client.js
index 772da0c1..e974becf 100644
--- a/lib/bcoin/http/client.js
+++ b/lib/bcoin/http/client.js
@@ -43,19 +43,18 @@ utils.inherits(HTTPClient, EventEmitter);
 
 HTTPClient.prototype._init = function _init() {
   var self = this;
-  var io;
+  var IOClient;
 
-  return;
   try {
-    io = require('socket.io');
+    IOClient = require('socket.io-client');
   } catch (e) {
     ;
   }
 
-  if (!io)
+  if (!IOClient)
     return;
 
-  this.socket = new io.Socket(this.uri);
+  this.socket = new IOClient(this.uri);
 
   this.socket.on('error', function(err) {
     self.emit('error', err);
@@ -325,7 +324,6 @@ HTTPClient.prototype._getWallet = function getWallet(id, callback) {
 
 HTTPClient.prototype.getWallet = function getWallet(id, passphrase, callback) {
   var self = this;
-  var provider;
 
   return this._getWallet(id, function(err, json) {
     if (err)
diff --git a/lib/bcoin/http/request.js b/lib/bcoin/http/request.js
index add19586..0c98e933 100644
--- a/lib/bcoin/http/request.js
+++ b/lib/bcoin/http/request.js
@@ -5,6 +5,8 @@
  * https://github.com/indutny/bcoin
  */
 
+/* jshint -W069 */
+
 /**
  * @module request
  */
diff --git a/lib/bcoin/http/server.js b/lib/bcoin/http/server.js
index 74fdfb39..c43f8d08 100644
--- a/lib/bcoin/http/server.js
+++ b/lib/bcoin/http/server.js
@@ -385,7 +385,7 @@ HTTPServer.prototype._init = function _init() {
     var now = req.options.now;
     var age = req.options.age;
 
-    self.walletdb.zapWallet(id, now, age, function(err, wallet) {
+    self.walletdb.zapWallet(id, now, age, function(err) {
       if (err)
         return next(err);
 
@@ -427,9 +427,6 @@ HTTPServer.prototype._init = function _init() {
       if (err)
         return next(err);
 
-      if (!json)
-        return send(404);
-
       send(200, { success: true });
     });
   });
@@ -592,7 +589,7 @@ HTTPServer.prototype._init = function _init() {
   this.post('/broadcast', function(req, res, next, send) {
     self.pool.sendTX(req.options.tx, function(err) {
       if (err)
-        return callback(err);
+        return next(err);
 
       send(200, {
         success: true
diff --git a/lib/bcoin/input.js b/lib/bcoin/input.js
index 28952098..993ec101 100644
--- a/lib/bcoin/input.js
+++ b/lib/bcoin/input.js
@@ -180,7 +180,7 @@ Input.prototype.getAddress = function getAddress() {
  * @returns {Hash} hash
  */
 
-Input.prototype.getHash = function getHash(enc) {
+Input.prototype.getHash = function getHash() {
   var address = this.getAddress();
   if (!address)
     return;
diff --git a/lib/bcoin/keypair.js b/lib/bcoin/keypair.js
index d5ac5d4f..b829a99e 100644
--- a/lib/bcoin/keypair.js
+++ b/lib/bcoin/keypair.js
@@ -167,7 +167,7 @@ KeyPair.parseSecret = function parseSecret(secret) {
   var data = utils.fromBase58(secret);
   var p = new BufferReader(data, true);
   var compressed = false;
-  var prefix, type, privateKey;
+  var i, prefix, type, privateKey;
 
   prefix = p.readU8();
 
diff --git a/lib/bcoin/keyring.js b/lib/bcoin/keyring.js
index 0b370f8f..e3c4c48a 100644
--- a/lib/bcoin/keyring.js
+++ b/lib/bcoin/keyring.js
@@ -8,9 +8,6 @@
 var bcoin = require('./env');
 var utils = bcoin.utils;
 var assert = utils.assert;
-var networks = bcoin.protocol.network;
-var BufferWriter = require('./writer');
-var BufferReader = require('./reader');
 
 /**
  * Represents a key ring which amounts to an address. Used for {@link Wallet}.
diff --git a/lib/bcoin/ldb.js b/lib/bcoin/ldb.js
index 44600bc4..04e512ed 100644
--- a/lib/bcoin/ldb.js
+++ b/lib/bcoin/ldb.js
@@ -68,7 +68,7 @@ function ldb(options) {
  */
 
 ldb.getName = function getName(db) {
-  var ext;
+  var name, ext;
 
   if (!db)
     db = bcoin.db || 'leveldb';
diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index 4b6e0dd6..71937ba6 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -12,7 +12,6 @@
 
 var bcoin = require('./env');
 var EventEmitter = require('events').EventEmitter;
-var bn = require('bn.js');
 var constants = bcoin.protocol.constants;
 var utils = require('./utils');
 var assert = utils.assert;
@@ -21,6 +20,7 @@ var BufferReader = require('./reader');
 var VerifyError = bcoin.errors.VerifyError;
 var pad32 = utils.pad32;
 var DUMMY = new Buffer([0]);
+var ptrSize;
 
 /**
  * Represents a mempool.
@@ -227,9 +227,7 @@ Mempool.prototype.destroy = function destroy(callback) {
 
 Mempool.prototype.addBlock = function addBlock(block, callback, force) {
   var self = this;
-  var txs = [];
   var unlock = this._lock(addBlock, [block, callback], force);
-  var entry;
 
   if (!unlock)
     return;
@@ -238,7 +236,6 @@ Mempool.prototype.addBlock = function addBlock(block, callback, force) {
 
   utils.forEachSerial(block.txs.slice().reverse(), function(tx, next) {
     var hash = tx.hash('hex');
-    var copy;
 
     if (tx.isCoinbase())
       return next();
@@ -334,7 +331,7 @@ Mempool.prototype.limitMempoolSize = function limitMempoolSize(entryHash, callba
     if (err)
       return callback(err);
 
-    utils.forEachSerial(function(entry, next) {
+    utils.forEachSerial(entries, function(entry, next) {
       if (self.getSize() <= self.maxSize)
         return callback(null, trimmed);
 
@@ -623,7 +620,7 @@ Mempool.prototype.addTX = function addTX(tx, callback, force) {
   var lockFlags = constants.flags.STANDARD_LOCKTIME_FLAGS;
   var hash = tx.hash('hex');
   var ret = {};
-  var now, entry;
+  var entry;
 
   var unlock = this._lock(addTX, [tx, callback], force);
   if (!unlock)
@@ -840,7 +837,7 @@ Mempool.prototype.removeUnchecked = function removeUnchecked(entry, limit, callb
 
   callback = utils.wrap(callback, unlock);
 
-  this.fillAllHistory(entry.tx, function(err, tx) {
+  this.fillAllHistory(entry.tx, function(err) {
     if (err)
       return callback(err);
 
@@ -1061,7 +1058,7 @@ Mempool.prototype.countAncestors = function countAncestors(tx, callback) {
   var self = this;
   var max = 0;
 
-  utils.forEachSerial(tx.inputs, function(input, next, i) {
+  utils.forEachSerial(tx.inputs, function(input, next) {
     var count = 0;
     self.getTX(input.prevout.hash, function(err, tx) {
       if (err)
@@ -1099,7 +1096,7 @@ Mempool.prototype.countAncestors = function countAncestors(tx, callback) {
 
 Mempool.prototype.storeOrphan = function storeOrphan(tx) {
   var prevout = {};
-  var i, hash, batch, input, prev;
+  var i, hash, input, prev;
 
   if (tx.getSize() > 5000) {
     bcoin.debug('Ignoring large orphan: %s', tx.rhash);
@@ -1434,7 +1431,7 @@ Mempool.prototype.isDoubleSpend = function isDoubleSpend(tx, callback) {
 
 /**
  * Calculate bitcoinj-style confidence.
- * @see https://github.com/bitcoinj/bitcoinj/blob/master/core/src/main/java/org/bitcoinj/core/TransactionConfidence.java
+ * @see http://bit.ly/1OVQwlO
  * @param {TX|Hash} hash
  * @param {Function} callback - Returns [Error, Number].
  */
@@ -1513,7 +1510,6 @@ Mempool.prototype.getConfidence = function getConfidence(hash, callback) {
  */
 
 Mempool.prototype._addUnchecked = function _addUnchecked(entry, callback) {
-  var self = this;
   var tx = entry.tx;
   var hash = tx.hash('hex');
   var i, addresses, address, input, output, key, coin, batch;
@@ -1579,7 +1575,7 @@ Mempool.prototype._addUnchecked = function _addUnchecked(entry, callback) {
 
 Mempool.prototype._removeUnchecked = function _removeUnchecked(hash, limit, callback) {
   var self = this;
-  var batch, i, addresses, output, tx;
+  var batch, i, addresses, tx;
 
   if (hash.tx)
     hash = hash.tx.hash('hex');
@@ -1642,7 +1638,8 @@ Mempool.prototype._removeUnchecked = function _removeUnchecked(hash, limit, call
         return callback(err);
 
       utils.forEachSerial(tx.outputs, function(output, next, i) {
-        key = hash + '/' + i;
+        var key = hash + '/' + i;
+        var address;
 
         if (output.script.isUnspendable())
           return next();
@@ -1718,9 +1715,9 @@ Mempool.prototype.memUsageAccurate = function memUsageAccurate(tx) {
 
 Mempool.prototype.memUsageBitcoind = function memUsageBitcoind(tx) {
   var mem = 0;
-  var i, input;
+  var i, j, input;
 
-  mem += mallocUsage(tx.inputs.length)
+  mem += mallocUsage(tx.inputs.length);
   mem += mallocUsage(tx.outputs.length);
 
   for (i = 0; i < tx.inputs.length; i++)
@@ -1908,7 +1905,7 @@ MempoolEntry.prototype.isFree = function isFree(height) {
  * @const {Number}
  */
 
-var ptrSize = (process.platform == null
+ptrSize = (process.platform == null
   || process.platform === 'x64'
   || process.platform === 'ia64'
   || process.platform === 'arm') ? 8 : 4;
diff --git a/lib/bcoin/merkleblock.js b/lib/bcoin/merkleblock.js
index d87de24b..a6dae1c9 100644
--- a/lib/bcoin/merkleblock.js
+++ b/lib/bcoin/merkleblock.js
@@ -165,7 +165,6 @@ MerkleBlock.prototype.verifyPartial = function verifyPartial() {
  */
 
 MerkleBlock.prototype.extractTree = function extractTree() {
-  var self = this;
   var hashes = this.hashes;
   var flags = this.flags;
   var bitsUsed = 0;
@@ -221,9 +220,9 @@ MerkleBlock.prototype.extractTree = function extractTree() {
   }
 
   for (p = 0; p < bits.length; p++)
-    bits[p] = (flags[p / 8 | 0] & (1 << (p % 8))) !== 0;
+    bits[p] = +((flags[p / 8 | 0] & (1 << (p % 8))) !== 0);
 
-  if (totalTX == 0)
+  if (totalTX === 0)
     return;
 
   if (totalTX > constants.block.MAX_SIZE / 60)
@@ -247,7 +246,7 @@ MerkleBlock.prototype.extractTree = function extractTree() {
   if (((bitsUsed + 7) / 8 | 0) !== ((bits.length + 7) / 8 | 0))
     return;
 
-  if (hashUsed != hashes.length)
+  if (hashUsed !== hashes.length)
     return;
 
   return {
diff --git a/lib/bcoin/miner.js b/lib/bcoin/miner.js
index 5aa68040..2213129a 100644
--- a/lib/bcoin/miner.js
+++ b/lib/bcoin/miner.js
@@ -315,8 +315,6 @@ Miner.prototype.createBlock = function createBlock(version, callback) {
  */
 
 Miner.prototype.mineBlock = function mineBlock(version, callback) {
-  var self = this;
-
   if (typeof version === 'function') {
     callback = version;
     version = null;
diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index 8d789d78..e108c0cd 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -6,12 +6,10 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
 var utils = require('./utils');
 var assert = utils.assert;
 var constants = bcoin.protocol.constants;
 var Script = bcoin.script;
-var Witness = bcoin.witness;
 var opcodes = constants.opcodes;
 
 /**
@@ -363,7 +361,7 @@ MTX.prototype.createSignature = function createSignature(index, prev, key, type,
  */
 
 MTX.prototype.signInput = function signInput(index, addr, type) {
-  var input, prev, signature, index, signatures, i;
+  var input, prev, signature, keyIndex, signatures, i;
   var len, m, n, keys, vector, dummy, version;
 
   if (typeof index !== 'number')
@@ -500,25 +498,25 @@ MTX.prototype.signInput = function signInput(index, addr, type) {
 
   // Find the key index so we can place
   // the signature in the same index.
-  index = utils.indexOf(keys, addr.publicKey);
+  keyIndex = utils.indexOf(keys, addr.publicKey);
 
   // Our public key is not in the prev_out
   // script. We tried to sign a transaction
   // that is not redeemable by us.
-  if (index === -1)
+  if (keyIndex === -1)
     return false;
 
   // Offset key index by one to turn it into
   // "sig index". Accounts for OP_0 byte at
   // the start.
-  index++;
+  keyIndex++;
 
   // Add our signature to the correct slot
   // and increment the total number of
   // signatures.
-  if (index < len && signatures < m) {
-    if (Script.isZero(vector[index])) {
-      vector[index] = signature;
+  if (keyIndex < len && signatures < m) {
+    if (Script.isZero(vector[keyIndex])) {
+      vector[keyIndex] = signature;
       signatures++;
     }
   }
@@ -558,7 +556,6 @@ MTX.prototype.signInput = function signInput(index, addr, type) {
 
 MTX.prototype.isSigned = function isSigned() {
   var i, input, prev, vector, m, len, j;
-  var total = 0;
 
   for (i = 0; i < this.inputs.length; i++) {
     input = this.inputs[i];
@@ -946,7 +943,7 @@ MTX.prototype.selectCoins = function selectCoins(coins, options) {
   var index = 0;
   var tx = this.clone();
   var outputValue = tx.getOutputValue();
-  var tryFree, i, size, change, fee, min, output;
+  var tryFree, i, size, change, fee, min, output, err;
 
   if (!options)
     options = {};
diff --git a/lib/bcoin/output.js b/lib/bcoin/output.js
index 798537a8..23243cf7 100644
--- a/lib/bcoin/output.js
+++ b/lib/bcoin/output.js
@@ -6,8 +6,8 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
 var utils = require('./utils');
+var constants = bcoin.protocol.constants;
 var assert = utils.assert;
 var BufferWriter = require('./writer');
 var Framer = bcoin.protocol.framer;
diff --git a/lib/bcoin/peer.js b/lib/bcoin/peer.js
index d8f57a20..38e86229 100644
--- a/lib/bcoin/peer.js
+++ b/lib/bcoin/peer.js
@@ -7,7 +7,6 @@
 
 var bcoin = require('./env');
 var EventEmitter = require('events').EventEmitter;
-var bn = require('bn.js');
 var utils = require('./utils');
 var assert = utils.assert;
 var constants = bcoin.protocol.constants;
@@ -314,7 +313,6 @@ Peer.prototype.createSocket = function createSocket(port, host) {
  */
 
 Peer.prototype.announce = function announce(items) {
-  var self = this;
   var inv = [];
   var headers = [];
   var i, item;
@@ -364,7 +362,6 @@ Peer.prototype.announce = function announce(items) {
  */
 
 Peer.prototype.sendInv = function sendInv(items) {
-  var self = this;
   var inv = [];
   var i, item, chunk;
 
@@ -392,7 +389,6 @@ Peer.prototype.sendInv = function sendInv(items) {
  */
 
 Peer.prototype.sendHeaders = function sendHeaders(items) {
-  var self = this;
   var headers = [];
   var i, item, chunk;
 
@@ -893,7 +889,7 @@ Peer.prototype._handleGetUTXOs = function _handleGetUTXOs(payload) {
   if (payload.prevout.length > 15)
     return done();
 
-  utils.forEachSerial(payload.prevout, function(prevout, next, i) {
+  utils.forEachSerial(payload.prevout, function(prevout, next) {
     var hash = prevout.hash;
     var index = prevout.index;
 
@@ -1079,6 +1075,7 @@ Peer.prototype._handleGetBlocks = function _handleGetBlocks(payload) {
 };
 
 Peer.prototype._handleVersion = function _handleVersion(payload) {
+  var self = this;
   var version = payload.version;
   var services = payload.services;
 
@@ -1451,7 +1448,7 @@ Peer.prototype._handleGetAddr = function _handleGetAddr() {
   var hosts = {};
   var items = [];
   var ts = utils.now() - (process.uptime() | 0);
-  var i, seed, peer;
+  var i, seed;
 
   if (this.pool.options.selfish)
     return;
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index 01fb78b5..92823e5c 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -74,7 +74,6 @@ var VerifyError = bcoin.errors.VerifyError;
  */
 
 function Pool(options) {
-  var self = this;
   var seeds;
 
   if (!(this instanceof Pool))
@@ -219,6 +218,7 @@ Pool.prototype.open = function open(callback) {
 
 Pool.prototype.connect = function connect() {
   var self = this;
+  var i;
 
   assert(this.loaded, 'Pool is not loaded.');
 
@@ -257,7 +257,6 @@ Pool.prototype.connect = function connect() {
 
 Pool.prototype._init = function _init() {
   var self = this;
-  var i;
 
   if (this.mempool) {
     this.mempool.on('bad orphan', function(tx) {
@@ -725,12 +724,12 @@ Pool.prototype._handleHeaders = function _handleHeaders(headers, peer, callback)
     var hash = header.hash('hex');
 
     if (last && header.prevBlock !== last) {
-      peer.sendReject(block, 'invalid', 'bad-prevblk', 100);
+      peer.sendReject(header, 'invalid', 'bad-prevblk', 100);
       return next(new Error('Bad header chain.'));
     }
 
     if (!header.verify(ret)) {
-      peer.sendReject(block, 'invalid', ret.reason, 100);
+      peer.sendReject(header, 'invalid', ret.reason, 100);
       self.rejects.add(header.hash());
       return next(new VerifyError(header, 'invalid', ret.reason, ret.score));
     }
@@ -997,7 +996,7 @@ Pool.prototype._createPeer = function _createPeer(options) {
   });
 
   peer.on('notfound', function(items) {
-    var i, item;
+    var i, item, req;
 
     for (i = 0; i < items.length; i++) {
       item = items[i];
@@ -1223,8 +1222,6 @@ Pool.prototype._addPeer = function _addPeer() {
   });
 
   peer.once('ack', function() {
-    var i;
-
     if (self.destroyed)
       return;
 
@@ -1289,8 +1286,6 @@ Pool.prototype._removePeer = function _removePeer(peer) {
  */
 
 Pool.prototype.watch = function watch(data) {
-  var self = this;
-
   if (Buffer.isBuffer(data))
     data = data.toString('hex');
 
@@ -1317,8 +1312,6 @@ Pool.prototype.watch = function watch(data) {
  */
 
 Pool.prototype.unwatch = function unwatch(data) {
-  var self = this;
-
   if (Buffer.isBuffer(data))
     data = data.toString('hex');
 
@@ -1868,7 +1861,6 @@ Pool.prototype.getUTXOs = function getUTXOs(utxos, callback) {
 
 Pool.prototype.fillHistory = function fillHistory(tx, callback) {
   var utxos = [];
-  var reqs = [];
   var i, input;
 
   for (i = 0; i < tx.inputs.length; i++) {
@@ -1965,7 +1957,7 @@ Pool.prototype._getRandom = function _getRandom(seeds, uniq) {
  */
 
 Pool.prototype.setSeeds = function setSeeds(seeds) {
-  var i, seed;
+  var i;
 
   this.seeds = [];
   this.hosts = {};
@@ -2358,9 +2350,6 @@ BroadcastItem.prototype.addCallback = function addCallback(callback) {
  */
 
 BroadcastItem.prototype.start = function start() {
-  var self = this;
-  var i;
-
   assert(!this.timeout, 'Already started.');
   assert(!this.pool.inv.map[this.hash], 'Already started.');
 
@@ -2429,7 +2418,6 @@ BroadcastItem.prototype.finish = function finish(err) {
  */
 
 BroadcastItem.prototype.send = function send(peer, witness) {
-  var self = this;
   var data;
 
   if (!this.msg) {
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index a238b7a4..f0329070 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -837,10 +837,9 @@ Framer.witnessTX = function _witnessTX(tx, writer) {
  */
 
 Framer.script = function _script(script, writer) {
+  var p = new BufferWriter(writer);
   var data;
 
-  p = new BufferWriter(writer);
-
   if (script.encode)
     data = script.encode();
   else
@@ -979,7 +978,7 @@ Framer.extendedTX = function extendedTX(tx, saveCoins, writer) {
   var index = tx.index;
   var changeIndex = tx.changeIndex != null ? tx.changeIndex : -1;
   var p = new BufferWriter(writer);
-  var i, input, tmp;
+  var i, input;
 
   if (height === -1)
     height = 0x7fffffff;
@@ -1141,7 +1140,7 @@ Framer.reject = function reject(details, writer) {
   var ccode = details.ccode;
 
   if (typeof ccode === 'string')
-    ccode = constants.reject[ccode.toUpperCase()]
+    ccode = constants.reject[ccode.toUpperCase()];
 
   if (!ccode)
     ccode = constants.reject.INVALID;
@@ -1293,7 +1292,7 @@ Framer.getUTXOs = function getUTXOs(data, writer) {
 
 Framer.UTXOs = function UTXOs(data, writer) {
   var p = new BufferWriter(writer);
-  var i, j, coin, height, index, map;
+  var i, coin, height, map;
 
   if (!data.map) {
     assert(data.hits);
@@ -1515,7 +1514,7 @@ Framer.block.size = function blockSize(block) {
  */
 
 Framer.tx.size = function txSize(tx) {
-  var writer = new BufferWriter()
+  var writer = new BufferWriter();
   Framer.renderTX(tx, false, writer);
   return writer.written;
 };
diff --git a/lib/bcoin/protocol/network.js b/lib/bcoin/protocol/network.js
index 103d020c..f1723079 100644
--- a/lib/bcoin/protocol/network.js
+++ b/lib/bcoin/protocol/network.js
@@ -7,7 +7,6 @@
 
 var bn = require('bn.js');
 var utils = require('../utils');
-var assert = utils.assert;
 
 /**
  * @module network
diff --git a/lib/bcoin/protocol/parser.js b/lib/bcoin/protocol/parser.js
index 306f6d31..dc3f672e 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -6,6 +6,7 @@
  */
 
 var bcoin = require('../env');
+var bn = require('bn.js');
 var EventEmitter = require('events').EventEmitter;
 var utils = require('../utils');
 var assert = utils.assert;
@@ -181,7 +182,6 @@ Parser.parseMempool = function parseMempool(p) {
  */
 
 Parser.parseSubmitOrder = function parseSubmitOrder(p) {
-  var hash, tx;
   p = new BufferReader(p);
   return {
     hash: p.readHash('hex'),
@@ -206,7 +206,6 @@ Parser.parseCheckOrder = function parseCheckOrder(p) {
  */
 
 Parser.parseReply = function parseReply(p) {
-  var hash, code, publicKey;
   p = new BufferReader(p);
   return {
     hash: p.readHash('hex'),
@@ -403,7 +402,7 @@ Parser.parseGetUTXOs = function parseGetUTXOs(p) {
 
 Parser.parseUTXOs = function parseUTXOs(p) {
   var chainHeight, tip, map, count, coins;
-  var coin, version, height, i, hits, ch, j;
+  var coin, version, height, i, hits, j;
 
   p = new BufferReader(p);
 
@@ -1245,7 +1244,7 @@ Parser.parseAlert = function parseAlert(p) {
   var version, relayUntil, expiration, id, cancel;
   var cancels, count, i, minVer, maxVer, subVers;
   var priority, comment, statusBar, reserved;
-  var payload;
+  var payload, signature;
 
   p = new BufferReader(p);
 
diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 102c4c02..894d6e05 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -123,7 +123,7 @@ Witness.prototype.getInputType = function getInputType() {
  * @returns {String|null}
  */
 
-Witness.prototype.getInputAddress = function getInputAddress(network) {
+Witness.prototype.getInputAddress = function getInputAddress() {
   return bcoin.address.fromWitness(this);
 };
 
@@ -251,7 +251,7 @@ Witness.fromRaw = function fromRaw(data, enc) {
  */
 
 Witness.fromString = function fromString(items) {
-  var result;
+  var i, result;
 
   if (!Array.isArray(items)) {
     if (typeof items !== 'string')
@@ -991,7 +991,7 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
   var op, val, v1, v2, v3;
   var n, n1, n2, n3;
   var res, key, sig, type, subscript, hash;
-  var keys, i, j, m, ikey, isig;
+  var i, j, m, ikey, isig;
   var locktime;
 
   if (flags == null)
@@ -1829,7 +1829,7 @@ Script.bool = function bool(value) {
  */
 
 Script.num = function num(value, flags, size) {
-  var result, n;
+  var result;
 
   assert(Buffer.isBuffer(value));
 
@@ -3472,6 +3472,8 @@ Script.prototype.getScripthashSigops = function getScripthashSigops(input) {
  */
 
 Script.witnessSigops = function witnessSigops(program, witness, flags) {
+  var redeem;
+
   if (flags == null)
     flags = constants.flags.STANDARD_VERIFY_FLAGS;
 
@@ -3599,7 +3601,7 @@ Script.fromString = function fromString(code) {
       if (op[0] === '\'') {
         assert(op[op.length - 1] === '\'', 'Unknown opcode.');
         op = op.slice(1, -1);
-        op = new Buffer(op, 'ascii')
+        op = new Buffer(op, 'ascii');
         p.writeBytes(Script.encode([op]));
         continue;
       }
diff --git a/lib/bcoin/timedata.js b/lib/bcoin/timedata.js
index bbdd78c7..cbfb546a 100644
--- a/lib/bcoin/timedata.js
+++ b/lib/bcoin/timedata.js
@@ -8,7 +8,6 @@
 var bcoin = require('./env');
 var EventEmitter = require('events').EventEmitter;
 var utils = require('./utils');
-var assert = utils.assert;
 
 /**
  * An object which handles "adjusted time". This may not
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 986364e7..fdaace65 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -6,13 +6,11 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
 var utils = require('./utils');
 var assert = utils.assert;
 var constants = bcoin.protocol.constants;
 var Script = bcoin.script;
 var Stack = bcoin.stack;
-var BufferReader = require('./reader');
 var BufferWriter = require('./writer');
 
 /**
@@ -925,7 +923,7 @@ TX.prototype.hasCoins = function hasCoins() {
 
 TX.prototype.fillCoins = function fillCoins(coins) {
   var total = 0;
-  var inputs, txs, key, i, input, prevout;
+  var key, i, input, prevout;
 
   if ((coins instanceof bcoin.coin) || (coins instanceof bcoin.tx))
     coins = [coins];
@@ -1369,7 +1367,7 @@ TX.prototype.checkInputs = function checkInputs(spendHeight, ret) {
   value = this.getOutputValue();
 
   if (value > total) {
-    ret.reason = 'bad-txns-in-belowout'
+    ret.reason = 'bad-txns-in-belowout';
     ret.score = 100;
     return false;
   }
@@ -1906,7 +1904,7 @@ TX.fromRaw = function fromRaw(data, enc) {
  */
 
 TX.prototype.toExtended = function toExtended(saveCoins, enc) {
-  var data;
+  var data, tmp;
 
   if (typeof saveCoins === 'string') {
     tmp = saveCoins;
@@ -1932,6 +1930,8 @@ TX.prototype.toExtended = function toExtended(saveCoins, enc) {
  */
 
 TX.parseExtended = function parseExtended(data, saveCoins, enc) {
+  var tmp;
+
   if (typeof saveCoins === 'string') {
     tmp = saveCoins;
     saveCoins = enc;
diff --git a/lib/bcoin/txdb.js b/lib/bcoin/txdb.js
index d8845fb3..df9ed8a4 100644
--- a/lib/bcoin/txdb.js
+++ b/lib/bcoin/txdb.js
@@ -22,7 +22,6 @@
  */
 
 var bcoin = require('./env');
-var bn = require('bn.js');
 var utils = require('./utils');
 var assert = bcoin.utils.assert;
 var EventEmitter = require('events').EventEmitter;
@@ -75,6 +74,7 @@ TXDB.prototype._lock = function _lock(func, args, force) {
 
 TXDB.prototype._loadFilter = function loadFilter(callback) {
   var self = this;
+  var i;
 
   if (!this.filter)
     return callback();
@@ -612,7 +612,7 @@ TXDB.prototype._removeSpenders = function removeSpenders(hash, ref, callback) {
     if (tx.ts !== 0)
       return callback(null, false);
 
-    if (ref.ts === 0 && ref.ps < ts.ps)
+    if (ref.ts === 0 && ref.ps < tx.ps)
       return callback(null, false);
 
     utils.forEachSerial(tx.outputs, function(output, next, i) {
@@ -1089,6 +1089,7 @@ TXDB.prototype._unconfirm = function unconfirm(tx, map, callback, force) {
 
 TXDB.prototype.getHistoryHashes = function getHistoryHashes(address, callback) {
   var self = this;
+  var txs = [];
 
   if (typeof address === 'function') {
     callback = address;
@@ -1137,6 +1138,7 @@ TXDB.prototype.getHistoryHashes = function getHistoryHashes(address, callback) {
 
 TXDB.prototype.getUnconfirmedHashes = function getUnconfirmedHashes(address, callback) {
   var self = this;
+  var txs = [];
 
   if (typeof address === 'function') {
     callback = address;
@@ -1186,6 +1188,7 @@ TXDB.prototype.getUnconfirmedHashes = function getUnconfirmedHashes(address, cal
 
 TXDB.prototype.getCoinHashes = function getCoinHashes(address, callback) {
   var self = this;
+  var coins = [];
 
   if (typeof address === 'function') {
     callback = address;
@@ -1667,7 +1670,6 @@ TXDB.prototype.getBalance = function getBalance(address, callback) {
   var self = this;
   var confirmed = 0;
   var unconfirmed = 0;
-  var i;
 
   if (typeof address === 'function') {
     callback = address;
diff --git a/lib/bcoin/uri.js b/lib/bcoin/uri.js
index 945f6551..12f4fca5 100644
--- a/lib/bcoin/uri.js
+++ b/lib/bcoin/uri.js
@@ -10,6 +10,7 @@
 var url = require('url');
 var querystring = require('querystring');
 var utils = require('./utils');
+var assert = utils.assert;
 
 /**
  * Parse a bitcoin URI.
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index cb5f7fde..8d5922b7 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -5,6 +5,8 @@
  * https://github.com/indutny/bcoin
  */
 
+/* global gc */
+
 /**
  * @exports utils
  */
@@ -903,7 +905,7 @@ utils.isIP = function isIP(ip) {
  * @returns {Boolean}
  */
 
-utils.isMapped = function isMapped(ip, version) {
+utils.isMapped = function isMapped(ip) {
   var i;
 
   if (!Buffer.isBuffer(ip))
@@ -2588,6 +2590,8 @@ utils.binaryRemove = function binaryRemove(items, item, compare) {
  */
 
 utils.global = (function() {
+  /* global self */
+
   if (this)
     return this;
 
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index a59911cb..8a16768c 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -1008,12 +1008,11 @@ Wallet.prototype.syncOutputDepth = function syncOutputDepth(tx) {
 /**
  * Get a redeem script or witness script by hash.
  * @param {Hash} hash - Can be a ripemd160 or a sha256.
- * @param {Number} prefix - See {@link network.address.prefixes}.
  * @returns {Script}
  */
 
-Wallet.prototype.getRedeem = function getRedeem(hash, prefix) {
-  var addr, address;
+Wallet.prototype.getRedeem = function getRedeem(hash) {
+  var address;
 
   if (typeof hash === 'string')
     hash = new Buffer(hash, 'hex');
@@ -1056,7 +1055,6 @@ Wallet.prototype.zap = function zap(now, age, callback) {
 Wallet.prototype.scan = function scan(getByAddress, callback) {
   var self = this;
   var res = false;
-  var i;
 
   return this._scan({}, getByAddress, function(err, depth, txs) {
     if (err)
diff --git a/lib/bcoin/worker.js b/lib/bcoin/worker.js
index 5ff65c8f..72dc9ae1 100644
--- a/lib/bcoin/worker.js
+++ b/lib/bcoin/worker.js
@@ -5,6 +5,8 @@
  * https://github.com/indutny/bcoin
  */
 
+/* jshint worker: true */
+
 var bcoin, env;
 
 if (typeof importScripts !== 'undefined') {
diff --git a/lib/bcoin/workers.js b/lib/bcoin/workers.js
index 28ba21ec..00034748 100644
--- a/lib/bcoin/workers.js
+++ b/lib/bcoin/workers.js
@@ -8,12 +8,12 @@
 var bcoin = require('./env');
 var EventEmitter = require('events').EventEmitter;
 var bn = require('bn.js');
-var constants = bcoin.protocol.constants;
 var utils = require('./utils');
 var global = utils.global;
 var assert = utils.assert;
 var BufferWriter = require('./writer');
 var BufferReader = require('./reader');
+var jobs;
 
 /**
  * A worker pool.
@@ -644,7 +644,7 @@ Master.listen = function listen(id, options) {
  * @const {Object}
  */
 
-var jobs = {};
+jobs = {};
 
 /**
  * Execute tx.verify() on worker.
@@ -710,7 +710,7 @@ Framer.prototype.packet = function packet(job, name, items) {
   p.writeU32(payload.length);
   p.writeBytes(payload);
   return p.render();
-}
+};
 
 Framer.prototype.body = function body(name, items) {
   var p = new BufferWriter();
diff --git a/package.json b/package.json
index d5a21227..a4e0e955 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,8 @@
   },
   "optionalDependencies": {
     "secp256k1": "3.0.0",
-    "socket.io": "1.4.5"
+    "socket.io": "1.4.6",
+    "socket.io-client": "1.4.6"
   },
   "devDependencies": {
     "browserify": "13.0.0",