diff --git a/lib/bcoin/async.js b/lib/bcoin/async.js
index 2e9570a1..00ad2b13 100644
--- a/lib/bcoin/async.js
+++ b/lib/bcoin/async.js
@@ -142,7 +142,7 @@ AsyncObject.prototype.destroy = AsyncObject.prototype.close;
 
 AsyncObject.prototype._error = function _error(event, err) {
   var listeners = this.listeners(event);
-  var i, callback;
+  var i;
 
   this.removeAllListeners(event);
 
diff --git a/lib/bcoin/bip152.js b/lib/bcoin/bip152.js
index 30a36c2f..100d4368 100644
--- a/lib/bcoin/bip152.js
+++ b/lib/bcoin/bip152.js
@@ -11,6 +11,7 @@ var utils = require('./utils');
 var assert = utils.assert;
 var constants = bcoin.protocol.constants;
 var siphash = require('./siphash');
+var bn = require('bn.js');
 var AbstractBlock = bcoin.abstractblock;
 
 /**
diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index 220311ea..f90f5eb2 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -8,7 +8,6 @@
 'use strict';
 
 var bcoin = require('./env');
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('./async');
 var constants = bcoin.protocol.constants;
 var utils = require('./utils');
@@ -56,8 +55,6 @@ var VerifyError = bcoin.errors.VerifyError;
  */
 
 function Chain(options) {
-  var self = this;
-
   if (!(this instanceof Chain))
     return new Chain(options);
 
@@ -1644,7 +1641,7 @@ Chain.prototype.purgeOrphans = function purgeOrphans() {
  */
 
 Chain.prototype.pruneOrphans = function pruneOrphans() {
-  var i, hashes, orphan, height, best, last;
+  var i, hashes, hash, orphan, height, best, last;
 
   hashes = Object.keys(this.orphan.map);
 
@@ -2552,7 +2549,7 @@ DeploymentState.prototype.hasCLTV = function hasCLTV() {
  */
 
 DeploymentState.prototype.hasMTP = function hasMTP() {
-  return (this.lockFlags & constants.flags.MEDIAN_TIME_PAST) !== 0
+  return (this.lockFlags & constants.flags.MEDIAN_TIME_PAST) !== 0;
 };
 
 /**
diff --git a/lib/bcoin/chaindb.js b/lib/bcoin/chaindb.js
index 882ec795..55fa576d 100644
--- a/lib/bcoin/chaindb.js
+++ b/lib/bcoin/chaindb.js
@@ -8,7 +8,6 @@
 'use strict';
 
 var bcoin = require('./env');
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('./async');
 var constants = bcoin.protocol.constants;
 var utils = require('./utils');
diff --git a/lib/bcoin/http/base.js b/lib/bcoin/http/base.js
index 8109fc98..b5a60344 100644
--- a/lib/bcoin/http/base.js
+++ b/lib/bcoin/http/base.js
@@ -7,7 +7,6 @@
 
 'use strict';
 
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('../async');
 var utils = require('../utils');
 var assert = utils.assert;
diff --git a/lib/bcoin/http/client.js b/lib/bcoin/http/client.js
index 0c203fae..5186d5ae 100644
--- a/lib/bcoin/http/client.js
+++ b/lib/bcoin/http/client.js
@@ -8,7 +8,6 @@
 'use strict';
 
 var bcoin = require('../env');
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('../async');
 var utils = require('../utils');
 var assert = utils.assert;
diff --git a/lib/bcoin/lowlevelup.js b/lib/bcoin/lowlevelup.js
index a1309267..4b917e12 100644
--- a/lib/bcoin/lowlevelup.js
+++ b/lib/bcoin/lowlevelup.js
@@ -9,7 +9,6 @@
 
 var utils = require('./utils');
 var assert = utils.assert;
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('./async');
 
 /**
@@ -29,8 +28,6 @@ var AsyncObject = require('./async');
  */
 
 function LowlevelUp(file, options) {
-  var self = this;
-
   if (!(this instanceof LowlevelUp))
     return new LowlevelUp(file, options);
 
diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index 97f6c796..9066f5b7 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -13,7 +13,6 @@
  */
 
 var bcoin = require('./env');
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('./async');
 var constants = bcoin.protocol.constants;
 var utils = require('./utils');
diff --git a/lib/bcoin/miner.js b/lib/bcoin/miner.js
index 1764148c..cc0547a5 100644
--- a/lib/bcoin/miner.js
+++ b/lib/bcoin/miner.js
@@ -443,7 +443,7 @@ MinerBlock.prototype._init = function _init() {
 
   // Create our merkle root.
   this.updateMerkle();
-}
+};
 
 utils.inherits(MinerBlock, EventEmitter);
 
diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index cc72e187..a41ed469 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -177,7 +177,7 @@ MTX.prototype.addInput = function addInput(options, index) {
  */
 
 MTX.prototype.addOutput = function addOutput(options, value) {
-  var options, output;
+  var output;
 
   if ((options instanceof bcoin.wallet)
       || (options instanceof bcoin.keyring)) {
diff --git a/lib/bcoin/node.js b/lib/bcoin/node.js
index 22619ef8..68d59e4c 100644
--- a/lib/bcoin/node.js
+++ b/lib/bcoin/node.js
@@ -8,7 +8,6 @@
 'use strict';
 
 var bcoin = require('./env');
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('./async');
 var utils = require('./utils');
 
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index 3c9d9344..3d928159 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -80,7 +80,6 @@ var InvItem = bcoin.packets.InvItem;
  */
 
 function Pool(options) {
-  var self = this;
   var i, seeds, hostname, seed;
 
   if (!(this instanceof Pool))
diff --git a/lib/bcoin/txdb.js b/lib/bcoin/txdb.js
index 63d3b9d1..4b8a9188 100644
--- a/lib/bcoin/txdb.js
+++ b/lib/bcoin/txdb.js
@@ -1574,6 +1574,7 @@ TXDB.prototype.hasTX = function hasTX(hash, callback) {
  */
 
 TXDB.prototype.getCoin = function getCoin(hash, index, callback) {
+  var self = this;
   var key = hash + '/' + index;
   var coin = this.coinCache.get(key);
 
@@ -1968,7 +1969,7 @@ WalletMap.prototype.toJSON = function toJSON() {
  */
 
 WalletMap.prototype.fromJSON = function fromJSON(json) {
-  var i, j, table, account, input, output, path;
+  var i, j, table, input, output, path;
   var hash, paths, hashes, accounts, values, key;
 
   table = {};
diff --git a/lib/bcoin/walletdb.js b/lib/bcoin/walletdb.js
index 7c6290d8..c8beb0d3 100644
--- a/lib/bcoin/walletdb.js
+++ b/lib/bcoin/walletdb.js
@@ -17,7 +17,6 @@
  */
 
 var bcoin = require('./env');
-var EventEmitter = require('events').EventEmitter;
 var AsyncObject = require('./async');
 var utils = require('./utils');
 var assert = utils.assert;