diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index bdf2a2fb..cd00c346 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -209,16 +209,22 @@ Block.prototype.getCoinbase = function getCoinbase() {
 };
 
 Block.prototype.inspect = function inspect() {
-  var copy = bcoin.block(this);
-  copy.__proto__ = null;
-  delete copy._raw;
-  delete copy._chain;
-  copy.hash = this.hash('hex');
-  copy.rhash = this.rhash;
-  copy.reward = utils.btc(this.getReward());
-  copy.fee = utils.btc(this.getFee());
-  copy.date = new Date((copy.ts || 0) * 1000).toISOString();
-  return copy;
+  return {
+    type: this.type,
+    height: this.height,
+    hash: utils.revHex(this.hash('hex')),
+    reward: utils.btc(this.getReward()),
+    fee: utils.btc(this.getFee()),
+    date: new Date((this.ts || 0) * 1000).toISOString(),
+    version: this.version,
+    prevBlock: utils.revHex(this.prevBlock),
+    merkleRoot: utils.revHex(this.merkleRoot),
+    ts: this.ts,
+    bits: this.bits,
+    nonce: this.nonce,
+    totalTX: this.totalTX,
+    txs: this.txs
+  };
 };
 
 Block.prototype.toJSON = function toJSON() {
diff --git a/lib/bcoin/blockdb.js b/lib/bcoin/blockdb.js
index bd9e4ece..b910f463 100644
--- a/lib/bcoin/blockdb.js
+++ b/lib/bcoin/blockdb.js
@@ -417,7 +417,7 @@ BlockDB.prototype.fillTXs = function fillTXs(txs, callback) {
 
   callback = utils.asyncify(callback);
 
-  utils.forEach(txs, function(err, next) {
+  utils.forEach(txs, function(tx, next) {
     self.fillTX(tx, function(err) {
       if (err)
         return next(err);
diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index 08416839..92761769 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -1335,12 +1335,6 @@ Chain.prototype.add = function add(initial, peer, callback, force) {
     if (self.total % 10 === 0)
       bcoin.profiler.snapshot();
 
-    // We intentionally did not asyncify the
-    // callback so if it calls chain.add, it
-    // still gets added to the queue. The
-    // chain.add below needs to be in a nextTick
-    // so we don't cause a stack overflow if
-    // these end up being all sync chain.adds.
     utils.nextTick(function() {
       unlock();
       if (err)
diff --git a/lib/bcoin/input.js b/lib/bcoin/input.js
index 0e6cd808..f7cfb10b 100644
--- a/lib/bcoin/input.js
+++ b/lib/bcoin/input.js
@@ -14,7 +14,7 @@ var constants = bcoin.protocol.constants;
  * Input
  */
 
-function Input(options) {
+function Input(options, tx) {
   var prevout;
 
   if (!(this instanceof Input))
@@ -35,14 +35,11 @@ function Input(options) {
   if (Buffer.isBuffer(this.prevout.hash))
     this.prevout.hash = utils.toHex(this.prevout.hash);
 
-  // this.script = options.script ? options.script.slice() : [];
   this.script = options.script || [];
   this.sequence = options.sequence == null ? 0xffffffff : options.sequence;
   this._size = options._size || 0;
   this._offset = options._offset || 0;
-
-  // if (options.script && options.script._raw)
-  //   utils.hidden(this.script, '_raw', options.script._raw);
+  this._mutable = !tx || (tx instanceof bcoin.mtx);
 }
 
 Input.prototype.__defineGetter__('data', function() {
@@ -51,9 +48,9 @@ Input.prototype.__defineGetter__('data', function() {
   if (this._data)
     return this._data;
 
-  data = Input.getData(this);
+  data = this.getData();
 
-  if (this.script.length && this.output)
+  if (!this._mutable)
     utils.hidden(this, '_data', data);
 
   return data;
@@ -163,7 +160,7 @@ Input.prototype.__defineGetter__('value', function() {
 //   locktime: Number,
 //   value: bn,
 //   script: Array,
-//   seq: Number,
+//   sequence: Number,
 //   prev: String,
 //   index: Number,
 //   none: Boolean
@@ -178,7 +175,7 @@ Input.getData = function getData(input) {
     side: 'input',
     value: new bn(0),
     script: input.script,
-    seq: input.seq
+    sequence: input.sequence
   };
 
   def.prev = input.prevout.hash;
@@ -206,17 +203,43 @@ Input.prototype.getData = function getData() {
 };
 
 Input.prototype.getType = function getType() {
-  var prev = this.output ? this.output.script : null;
+  var type;
+
   if (this.isCoinbase())
     return 'coinbase';
-  return bcoin.script.getInputType(this.script, prev);
+
+  if (this.output)
+    return this.output.getType();
+
+  if (this._type)
+    return this._type;
+
+  type = bcoin.script.getInputType(this.script);
+
+  if (!this._mutable)
+    this._type = type;
+
+  return type;
 };
 
 Input.prototype.getAddress = function getAddress() {
-  var prev = this.output ? this.output.script : null;
+  var address;
+
   if (this.isCoinbase())
     return;
-  return bcoin.script.getInputAddress(this.script, prev);
+
+  if (this.output)
+    return this.output.getAddress();
+
+  if (this._address)
+    return this._address;
+
+  address = bcoin.script.getInputAddress(this.script);
+
+  if (!this._mutable)
+    this._address = address;
+
+  return address;
 };
 
 Input.prototype.isRBF = function isRBF() {
@@ -320,8 +343,7 @@ Input.prototype.inspect = function inspect() {
     ? this.output.inspect()
     : { type: 'unknown', value: '0.0' };
 
-  output.hash = this.prevout.hash;
-  output.rhash = utils.revHex(this.prevout.hash);
+  output.hash = utils.revHex(this.prevout.hash);
   output.index = this.prevout.index;
 
   return {
@@ -338,7 +360,7 @@ Input.prototype.inspect = function inspect() {
     value: utils.btc(output.value),
     script: bcoin.script.format(this.script),
     redeem: this.redeem ? bcoin.script.format(this.redeem) : null,
-    seq: this.seq,
+    sequence: this.sequence,
     output: output
   };
 };
diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index 52abe82e..788e6886 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -107,7 +107,7 @@ MTX.prototype.addInput = function addInput(options, index) {
   // i = this._inputIndex(options.prevout.hash, options.prevout.index);
   // assert(i === -1);
 
-  input = bcoin.input(options);
+  input = bcoin.input(options, this);
 
   this.inputs.push(input);
 
@@ -560,7 +560,7 @@ MTX.prototype.addOutput = function addOutput(obj, value) {
     options = obj;
   }
 
-  output = bcoin.output(options);
+  output = bcoin.output(options, this);
 
   this.outputs.push(output);
 
diff --git a/lib/bcoin/output.js b/lib/bcoin/output.js
index 60674111..a62c5c95 100644
--- a/lib/bcoin/output.js
+++ b/lib/bcoin/output.js
@@ -14,7 +14,7 @@ var constants = bcoin.protocol.constants;
  * Output
  */
 
-function Output(options) {
+function Output(options, tx) {
   var value;
 
   if (!(this instanceof Output))
@@ -30,10 +30,10 @@ function Output(options) {
   }
 
   this.value = utils.satoshi(value || new bn(0));
-  // this.script = options.script ? options.script.slice() : [];
   this.script = options.script || [];
   this._size = options._size || 0;
   this._offset = options._offset || 0;
+  this._mutable = !tx || (tx instanceof bcoin.mtx);
 
   // For safety: do not allow usage of
   // Numbers, do not allow negative values.
@@ -41,9 +41,6 @@ function Output(options) {
   assert(!this.value.isNeg())
   assert(this.value.bitLength() <= 63);
   assert(!(this.value.toArray('be', 8)[0] & 0x80));
-
-  // if (options.script && options.script._raw)
-  //   utils.hidden(this.script, '_raw', options.script._raw);
 }
 
 Output.prototype.__defineGetter__('data', function() {
@@ -52,9 +49,9 @@ Output.prototype.__defineGetter__('data', function() {
   if (this._data)
     return this._data;
 
-  data = Output.getData(this);
+  data = this.getData();
 
-  if (this.script.length)
+  if (!this._mutable)
     utils.hidden(this, '_data', data);
 
   return data;
@@ -173,11 +170,31 @@ Output.prototype.getData = function getData() {
 };
 
 Output.prototype.getType = function getType() {
-  return bcoin.script.getOutputType(this.script);
+  var type;
+
+  if (this._type)
+    return this._type;
+
+  type = bcoin.script.getOutputType(this.script);
+
+  if (!this._mutable)
+    this._type = type;
+
+  return type;
 };
 
 Output.prototype.getAddress = function getAddress() {
-  return bcoin.script.getOutputAddress(this.script);
+  var address;
+
+  if (this._address)
+    return this._address;
+
+  address = bcoin.script.getOutputAddress(this.script);
+
+  if (!this._mutable)
+    this._address = address;
+
+  return address;
 };
 
 Output.prototype.getID = function getID() {
@@ -186,38 +203,6 @@ Output.prototype.getID = function getID() {
   return '[' + this.type + ':' + hash.slice(0, 7) + ']';
 };
 
-Output.prototype.testScript = function testScript(key, hash, keys, scriptHash, type) {
-  if (!type || type === 'pubkey') {
-    if (key) {
-      if (bcoin.script.isPubkey(this.script, key))
-        return true;
-    }
-  }
-
-  if (!type || type === 'pubkeyhash') {
-    if (hash) {
-      if (bcoin.script.isPubkeyhash(this.script, hash))
-        return true;
-    }
-  }
-
-  if (!type || type === 'multisig') {
-    if (keys) {
-      if (bcoin.script.isMultisig(this.script, keys))
-        return true;
-    }
-  }
-
-  if (!type || type === 'scripthash') {
-    if (scriptHash) {
-      if (bcoin.script.isScripthash(this.script, scriptHash))
-        return true;
-    }
-  }
-
-  return false;
-};
-
 Output.prototype.test = function test(addressTable) {
   var address = this.getAddress();
 
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 93f422a6..6d38da13 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -44,11 +44,11 @@ function TX(data, block, index) {
   // assert(data.outputs.length !== 0);
 
   data.inputs.forEach(function(input) {
-    this.inputs.push(new bcoin.input(input));
+    this.inputs.push(new bcoin.input(input, this));
   }, this);
 
   data.outputs.forEach(function(output) {
-    this.outputs.push(new bcoin.output(output));
+    this.outputs.push(new bcoin.output(output, this));
   }, this);
 
   if (block && this.ts === 0) {
@@ -742,24 +742,27 @@ TX.prototype.__defineGetter__('priority', function() {
 });
 
 TX.prototype.inspect = function inspect() {
-  var copy = this.clone();
-  copy.__proto__ = null;
-  delete copy._raw;
-  delete copy._chain;
-  copy.hash = this.hash('hex');
-  copy.rhash = this.rhash;
-  copy.rblock = this.rblock;
-  copy.value = utils.btc(this.getValue());
-  copy.fee = utils.btc(this.getFee());
-  copy.confirmations = this.getConfirmations();
-  copy.priority = this.getPriority().toString(10);
-  copy.date = new Date((copy.ts || 0) * 1000).toISOString();
-  return copy;
+  return {
+    type: this.type,
+    hash: utils.revHex(this.hash('hex')),
+    height: this.height,
+    value: utils.btc(this.getValue()),
+    fee: utils.btc(this.getFee()),
+    confirmations: this.getConfirmations(),
+    priority: this.getPriority().toString(10),
+    date: new Date((this.ts || 0) * 1000).toISOString(),
+    block: this.block ? utils.revHex(this.block) : null,
+    ts: this.ts,
+    version: this.version,
+    inputs: this.inputs,
+    outputs: this.outputs,
+    locktime: this.locktime
+  };
 };
 
 TX.prototype.toCompact = function toCompact(coins) {
   return {
-    type: 'tx',
+    type: this.type,
     block: this.block,
     height: this.height,
     ts: this.ts,
@@ -773,8 +776,6 @@ TX.prototype.toCompact = function toCompact(coins) {
 TX._fromCompact = function _fromCompact(json) {
   var raw, data, tx;
 
-  assert.equal(json.type, 'tx');
-
   raw = new Buffer(json.tx, 'hex');
   data = bcoin.protocol.parser.parseTX(raw);
 
@@ -795,12 +796,13 @@ TX._fromCompact = function _fromCompact(json) {
 };
 
 TX.fromCompact = function fromCompact(json) {
+  assert.equal(json.type, 'tx');
   return new TX(TX._fromCompact(json));
 };
 
 TX.prototype.toJSON = function toJSON() {
   return {
-    type: 'tx',
+    type: this.type,
     hash: utils.revHex(this.hash('hex')),
     height: this.height,
     block: this.block ? utils.revHex(this.block) : null,
@@ -833,6 +835,7 @@ TX._fromJSON = function fromJSON(json) {
 };
 
 TX.fromJSON = function fromJSON(json) {
+  assert.equal(json.type, 'tx');
   return new TX(TX._fromJSON(json));
 };
 
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 60337f43..c052a60d 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -1604,7 +1604,7 @@ utils.buildMerkleTree = function buildMerkleTree(items) {
     for (i = 0; i < size; i += 2) {
       i2 = Math.min(i + 1, size - 1);
       if (i2 === i + 1 && i2 + 1 === size
-          && tree[j + i] === tree[j + i2]) {
+          && utils.isEqual(tree[j + i], tree[j + i2])) {
         return;
       }
       hash = Buffer.concat([tree[j + i], tree[j + i2]]);