diff --git a/lib/bcoin/blockdb.js b/lib/bcoin/blockdb.js
index 03721d2e..deba0564 100644
--- a/lib/bcoin/blockdb.js
+++ b/lib/bcoin/blockdb.js
@@ -32,15 +32,21 @@ function BlockDB(options) {
     options = { file: options };
 
   if (!options.file)
-    options.file = process.env.HOME + '/bcoin-server-' + network.type + '.ldb';
+    options.file = process.env.HOME + '/bcoin-index-' + network.type + '.db';
 
   this.options = options;
+
   this.parser = new bcoin.protocol.parser();
+
   this.data = new BlockData();
+
   this.index = levelup(options.file, {
     keyEncoding: 'ascii',
     valueEncoding: 'binary',
-    cacheSize: 16 * 1024 * 1024
+    cacheSize: 16 * 1024 * 1024,
+    db: bcoin.isBrowser
+      ? require('memdown')
+      : require('level' + 'down')
   });
 }
 
@@ -83,22 +89,28 @@ BlockDB.prototype.saveBlock = function saveBlock(block, callback) {
   var batch = this.index.batch();
 
   this.data.saveAsync(block._raw, function(err, data) {
+    var batch, blockOffset;
+
     if (err)
       return callback(err);
 
-    var blockOffset = self.createOffset(data.size, data.offset, block.height);
+    batch = self.index.batch();
+
+    blockOffset = self.createOffset(data.size, data.offset, block.height);
 
-    var batch = self.index.batch();
     batch.put('b/b/' + block.hash('hex'), blockOffset);
     batch.put('b/h/' + block.height, blockOffset);
 
     block.txs.forEach(function(tx, i) {
-      var txOffset = self.createOffset(
-        tx._size, data.offset + tx._offset,
-        block.height);
-
       var hash = tx.hash('hex');
       var uniq = {};
+      var txOffset;
+
+      txOffset = self.createOffset(
+        tx._size,
+        data.offset + tx._offset,
+        block.height
+      );
 
       batch.put('t/t/' + hash, txOffset);
 
@@ -122,8 +134,12 @@ BlockDB.prototype.saveBlock = function saveBlock(block, callback) {
         if (uaddr)
           batch.put('t/a/' + uaddr + '/' + hash, txOffset);
 
-        if (address)
-          batch.del('u/a/' + address + '/' + input.prevout.hash + '/' + input.prevout.index);
+        if (address) {
+          batch.del(
+            'u/a/' + address
+            + '/' + input.prevout.hash
+            + '/' + input.prevout.index);
+        }
 
         batch.del('u/t/' + input.prevout.hash + '/' + input.prevout.index);
       });
@@ -131,7 +147,7 @@ BlockDB.prototype.saveBlock = function saveBlock(block, callback) {
       tx.outputs.forEach(function(output) {
         var type = output.getType();
         var address = output.getAddress();
-        var uaddr;
+        var uaddr, coinOffset;
 
         if (type === 'pubkey' || type === 'multisig')
           address = null;
@@ -145,10 +161,11 @@ BlockDB.prototype.saveBlock = function saveBlock(block, callback) {
             uaddr = null;
         }
 
-        var coinOffset = self.createOffset(
+        coinOffset = self.createOffset(
           output._size,
           data.offset + tx._offset + output._offset,
-          block.height);
+          block.height
+        );
 
         if (uaddr)
           batch.put('t/a/' + uaddr + '/' + hash, txOffset);
@@ -207,7 +224,7 @@ BlockDB.prototype.removeBlock = function removeBlock(hash, callback) {
         tx.inputs.forEach(function(input) {
           var type = input.getType();
           var address = input.getAddress();
-          var uaddr;
+          var uaddr, coinOffset;
 
           if (type === 'pubkey' || type === 'multisig')
             address = null;
@@ -224,15 +241,23 @@ BlockDB.prototype.removeBlock = function removeBlock(hash, callback) {
           if (uaddr)
             batch.del('t/a/' + uaddr + '/' + hash);
 
-          var coinOffset = self.createOffset(
+          coinOffset = self.createOffset(
             input.output._size,
             block._fileOffset + tx._offset + input.output._offset,
-            block.height);
+            block.height
+          );
 
-          if (address)
-            batch.put('u/a/' + address + '/' + input.output.hash + '/' + input.output.index, coinOffset);
+          if (address) {
+            batch.put('u/a/' + address
+              + '/' + input.output.hash
+              + '/' + input.output.index,
+              coinOffset);
+          }
 
-          batch.put('u/t/' + input.output.hash + '/' + input.output.index, coinOffset);
+          batch.put('u/t/'
+            + input.output.hash
+            + '/' + input.output.index,
+            coinOffset);
         });
 
         tx.outputs.forEach(function(output) {
@@ -272,6 +297,11 @@ BlockDB.prototype.fillTX = function fillTX(tx, callback) {
   var self = this;
   var pending = tx.inputs.length;
 
+  callback = utils.asyncify(callback);
+
+  if (!pending)
+    return callback();
+
   tx.inputs.forEach(function(input) {
     if (input.output) {
       if (!--pending)
@@ -295,6 +325,11 @@ BlockDB.prototype.fillTX2 = function fillTX2(tx, callback) {
   var self = this;
   var pending = tx.inputs.length;
 
+  callback = utils.asyncify(callback);
+
+  if (!pending)
+    return callback();
+
   tx.inputs.forEach(function(input) {
     if (input.output) {
       if (!--pending)
@@ -324,7 +359,7 @@ BlockDB.prototype.getCoinsByAddress = function getCoinsByAddress(addresses, call
 
   addresses = utils.uniqs(addresses);
 
-  var pending = addresses.length;
+  pending = addresses.length;
 
   addresses.forEach(function(address) {
     self._getCoinsByAddress(address, function(err, coin) {
@@ -345,10 +380,11 @@ BlockDB.prototype._getCoinsByAddress = function _getCoinsByAddress(address, call
   var pending = 0;
   var coins = [];
   var done = false;
+  var stream;
 
   callback = utils.asyncify(callback);
 
-  var stream = this.index.createReadStream({
+  stream = this.index.createReadStream({
     start: 'u/a/' + address,
     end: 'u/a/' + address + '~'
   });
@@ -366,7 +402,11 @@ BlockDB.prototype._getCoinsByAddress = function _getCoinsByAddress(address, call
         return callback(err);
 
       if (data) {
-        data = self.parser.parseTXOut(data);
+        try {
+          data = self.parser.parseTXOut(data);
+        } catch (e) {
+          return callback(e);
+        }
         coin = bcoin.coin({
           version: 1,
           hash: hash,
@@ -403,7 +443,7 @@ BlockDB.prototype.getCoin = function getCoin(hash, index, callback) {
   var self = this;
   var id = 'u/t/' + hash + '/' + index;
 
-  this.index.get(id, { valueEncoding: 'binary' }, function(err, record) {
+  this.index.get(id, function(err, record) {
     if (err) {
       if (err.type === 'NotFoundError')
         return callback();
@@ -419,7 +459,11 @@ BlockDB.prototype.getCoin = function getCoin(hash, index, callback) {
         return callback(err);
 
       if (data) {
-        data = self.parser.parseTXOut(data);
+        try {
+          data = self.parser.parseTXOut(data);
+        } catch (e) {
+          return callback(e);
+        }
         coin = bcoin.coin({
           version: 1,
           hash: hash,
@@ -493,8 +537,13 @@ BlockDB.prototype._getTXByAddress = function _getTXByAddress(address, callback)
         return callback(err);
 
       if (data) {
-        tx = bcoin.tx.fromRaw(data);
-        entry = bcoin.chain.global.db.get(record.height);
+        try {
+          tx = bcoin.tx.fromRaw(data);
+          entry = bcoin.chain.global.db.get(record.height);
+          assert(entry);
+        } catch (e) {
+          return callback(e);
+        }
         tx.height = record.height;
         tx.ts = entry.ts;
         tx.block = entry.hash;
@@ -525,7 +574,7 @@ BlockDB.prototype.getTX = function getTX(hash, callback) {
   var self = this;
   var id = 't/t/' + hash;
 
-  this.index.get(id, { valueEncoding: 'binary' }, function(err, record) {
+  this.index.get(id, function(err, record) {
     if (err) {
       if (err.type === 'NotFoundError')
         return callback();
@@ -541,8 +590,13 @@ BlockDB.prototype.getTX = function getTX(hash, callback) {
         return callback(err);
 
       if (data) {
-        tx = bcoin.tx.fromRaw(data);
-        entry = bcoin.chain.global.db.get(record.height);
+        try {
+          tx = bcoin.tx.fromRaw(data);
+          entry = bcoin.chain.global.db.get(record.height);
+          assert(entry);
+        } catch (e) {
+          return callback(e);
+        }
         tx.height = record.height;
         tx.ts = entry.ts;
         tx.block = entry.hash;
@@ -560,7 +614,7 @@ BlockDB.prototype.getBlock = function getBlock(hash, callback) {
   if (typeof hash === 'number')
     id = 'b/h/' + value;
 
-  this.index.get(id, { valueEncoding: 'binary' }, function(err, record) {
+  this.index.get(id, function(err, record) {
     if (err) {
       if (err.type === 'NotFoundError')
         return callback();
@@ -576,7 +630,11 @@ BlockDB.prototype.getBlock = function getBlock(hash, callback) {
         return callback(err);
 
       if (data) {
-        block = bcoin.block.fromRaw(data);
+        try {
+          block = bcoin.block.fromRaw(data);
+        } catch (e) {
+          return callback(e);
+        }
         block._fileOffset = record.offset;
         block.height = record.height;
       }
@@ -590,19 +648,18 @@ BlockDB.prototype.getBlock = function getBlock(hash, callback) {
  * BlockData
  */
 
-function BlockData(chain, options) {
+function BlockData(options) {
   if (!(this instanceof BlockData))
-    return new BlockData(chain, options);
+    return new BlockData(options);
 
   if (!options)
     options = {};
 
   this.options = options;
-  this.chain = chain;
   this.file = options.file;
 
   if (!this.file)
-    this.file = process.env.HOME + '/bcoin-' + network.type + '.data';
+    this.file = process.env.HOME + '/bcoin-data-' + network.type + '.db';
 
   this._queue = [];
   this._cache = {};
@@ -628,10 +685,8 @@ BlockData.prototype._init = function _init() {
     }
   }
 
-  if (!this.exists()) {
-    fs.writeFileSync(this.file, new Buffer(0));
-    fs.truncateSync(this.file, 0);
-  }
+  if (!this.exists())
+    fs.writeFileSync(this.file, new Buffer([]));
 
   this.size = this.getSize();
 
@@ -757,9 +812,8 @@ BlockData.prototype.saveAsync = function saveAsync(data, callback) {
   });
 };
 
-BlockData.prototype.truncate = function truncate(height) {
-  this.size = (height + 1) * BLOCK_SIZE;
-  this.tip = height;
+BlockData.prototype.truncate = function truncate(size) {
+  this.size = size;
 
   if (!bcoin.fs) {
     this.ramdisk.truncate(this.size);
diff --git a/lib/bcoin/chaindb.js b/lib/bcoin/chaindb.js
index 3b048621..f2a468b3 100644
--- a/lib/bcoin/chaindb.js
+++ b/lib/bcoin/chaindb.js
@@ -33,7 +33,7 @@ function ChainDB(chain, options) {
   this.file = options.file;
 
   if (!this.file)
-    this.file = process.env.HOME + '/bcoin-' + network.type + '.blockchain';
+    this.file = process.env.HOME + '/bcoin-chain-' + network.type + '.db';
 
   this._queue = [];
   this._cache = {};
@@ -70,10 +70,8 @@ ChainDB.prototype._init = function _init() {
     }
   }
 
-  if (!this.exists()) {
-    fs.writeFileSync(this.file, new Buffer(0));
-    fs.truncateSync(this.file, 0);
-  }
+  if (!this.exists())
+    fs.writeFileSync(this.file, new Buffer([]));
 
   this.size = this.getSize();
 
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 4c3366a9..378f5a99 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -148,7 +148,7 @@ TX.prototype.input = TX.prototype.addInput;
 // tx._addInput({ hash: hash, index: index })
 // tx._addInput({ tx: tx, index: index })
 TX.prototype._addInput = function _addInput(options, index) {
-  var coin, input, ex, i, prevout;
+  var coin, input, ex, i, prevout, isInput;
 
   if (options instanceof TX) {
     options = { tx: options, index: index };
@@ -162,7 +162,6 @@ TX.prototype._addInput = function _addInput(options, index) {
   if (options.seq != null)
     options.sequence = options.seq;
 
-  var isInput;
   if (!options.prevout) {
     if (options instanceof bcoin.coin) {
       options = {
@@ -780,8 +779,7 @@ TX.prototype.scriptOutput = function scriptOutput(index, options) {
       script = [
         bcoin.script.array(options.locktime),
         'checklocktimeverify',
-        'drop',
-        'codeseparator'
+        'drop'
       ].concat(script);
     }
     hash = utils.ripesha(bcoin.script.encode(script));
@@ -808,6 +806,9 @@ TX.prototype.signatureHash = function signatureHash(index, s, type) {
   var copy = this.clone();
   var i, msg, hash;
 
+  if (typeof index !== 'number')
+    index = this.inputs.indexOf(index);
+
   if (!Array.isArray(s)) {
     type = s;
     s = this.inputs[index].output.script;
@@ -815,9 +816,6 @@ TX.prototype.signatureHash = function signatureHash(index, s, type) {
       s = bcoin.script.getRedeem(this.inputs[index].script);
   }
 
-  if (typeof index !== 'number')
-    index = this.inputs.indexOf(index);
-
   if (typeof type === 'string')
     type = constants.hashType[type];