diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index 16f30b1e..02432202 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -113,7 +113,7 @@ Block.prototype.getRaw = function getRaw() {
 };
 
 Block.prototype._getSize = function _getSize() {
-  var sizes = bcoin.protocol.framer.block._sizes(this);
+  var sizes = bcoin.protocol.framer.block.sizes(this);
   this._size = sizes.size;
   this._witnessSize = sizes.witnessSize;
 };
diff --git a/lib/bcoin/bloom.js b/lib/bcoin/bloom.js
index 0eaa425b..79d796d5 100644
--- a/lib/bcoin/bloom.js
+++ b/lib/bcoin/bloom.js
@@ -28,6 +28,7 @@ function Bloom(size, n, tweak) {
   this.size = size;
   this.n = n;
   this.tweak = tweak;
+  this.update = null;
 
   this.reset();
 }
diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index 8492466e..5a6dfb56 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -2314,7 +2314,7 @@ Chain.prototype.checkFinal = function checkFinal(prev, tx, flags, callback, forc
     if (err)
       return callback(err);
 
-    return callback(null, tx.isFinal(ts, height));
+    return callback(null, tx.isFinal(height, ts));
   }
 
   if (flags & constants.flags.MEDIAN_TIME_PAST)
diff --git a/lib/bcoin/coin.js b/lib/bcoin/coin.js
index 3bf75847..217c4397 100644
--- a/lib/bcoin/coin.js
+++ b/lib/bcoin/coin.js
@@ -225,28 +225,6 @@ Coin.fromRaw = function fromRaw(data, enc) {
   return new Coin(Coin._fromRaw(data, enc));
 };
 
-Coin.prototype.toUTXO = function toUTXO(enc) {
-  var data = bcoin.protocol.framer.utxo(this);
-
-  if (enc === 'hex')
-    data = utils.toHex(data);
-
-  return data;
-};
-
-Coin._fromUTXO = function _fromUTXO(data, enc) {
-  if (enc === 'hex')
-    data = new Buffer(data, 'hex');
-
-  data = bcoin.protocol.parser.parseUTXO(data);
-
-  return data;
-};
-
-Coin.fromUTXO = function fromUTXO(data, enc) {
-  return new Coin(Coin._fromUTXO(data, enc));
-};
-
 /**
  * Serialize the coin to an "extended" format,
  * including both the hash and the index.
diff --git a/lib/bcoin/coins.js b/lib/bcoin/coins.js
index 79253e18..96ea81b3 100644
--- a/lib/bcoin/coins.js
+++ b/lib/bcoin/coins.js
@@ -115,9 +115,9 @@ Coins.prototype.remove = function remove(index) {
  * @returns {Coin}
  */
 
-Coins.prototype.spend = function spend(hash, index) {
-  var coin = this.get(hash, index);
-  this.remove(hash, index);
+Coins.prototype.spend = function spend(index) {
+  var coin = this.get(index);
+  this.remove(index);
   return coin;
 };
 
@@ -169,7 +169,7 @@ Coins.prototype.fill = function fill(tx, spend) {
  * @returns {Number} Total.
  */
 
-Coins.prototype.count = function count(index) {
+Coins.prototype.count = function count() {
   return this.outputs.reduce(function(total, output) {
     if (!output)
       return total;
@@ -177,10 +177,13 @@ Coins.prototype.count = function count(index) {
   }, 0);
 };
 
-Coins.prototype.forEach = function forEach(callback, context) {
-  this.outputs.forEach(function(output, i) {
-    callback.call(context || this, output, i);
-  }, this);
+/**
+ * Convert collection to an array.
+ * @returns {Coin[]}
+ */
+
+Coins.prototype.toArray = function toArray() {
+  return this.outputs.filter(Boolean);
 };
 
 /**
diff --git a/lib/bcoin/coinview.js b/lib/bcoin/coinview.js
index 13b7f6af..05757680 100644
--- a/lib/bcoin/coinview.js
+++ b/lib/bcoin/coinview.js
@@ -91,7 +91,7 @@ CoinView.prototype.count = function count(hash) {
 
 CoinView.prototype.has = function has(hash, index) {
   if (!this.coins[hash])
-    return;
+    return false;
 
   return this.coins[hash].has(index);
 };
diff --git a/lib/bcoin/env.js b/lib/bcoin/env.js
index f305eb40..60a0e80f 100644
--- a/lib/bcoin/env.js
+++ b/lib/bcoin/env.js
@@ -196,7 +196,9 @@ function Environment(options) {
   this.coins = require('./coins')(this);
   this.coinview = require('./coinview')(this);
   this.tx = require('./tx')(this);
+  this.transaction = this.tx;
   this.mtx = require('./mtx')(this);
+  this.mutabletransaction = this.mtx;
   this.txdb = require('./txdb')(this);
   this.abstractblock = require('./abstractblock')(this);
   this.compactblock = require('./compactblock')(this);
diff --git a/lib/bcoin/fullnode.js b/lib/bcoin/fullnode.js
index 4617fd40..261e9abd 100644
--- a/lib/bcoin/fullnode.js
+++ b/lib/bcoin/fullnode.js
@@ -110,7 +110,7 @@ Fullnode.prototype._init = function _init() {
     key: this.options.sslKey,
     cert: this.options.sslCert,
     port: this.options.httpPort || 8080,
-    host: '0.0.0.0'
+    host: this.options.httpHost || '0.0.0.0'
   });
 
   // Bind to errors
diff --git a/lib/bcoin/hd.js b/lib/bcoin/hd.js
index 05d816cd..479c5908 100644
--- a/lib/bcoin/hd.js
+++ b/lib/bcoin/hd.js
@@ -855,7 +855,7 @@ HDPrivateKey.fromJSON = function fromJSON(json, passphrase) {
  * @returns {Boolean}
  */
 
-HDPublicKey.isHDPrivateKey = function isHDPrivateKey(obj) {
+HDPrivateKey.isHDPrivateKey = function isHDPrivateKey(obj) {
   return obj && obj.isPrivate && typeof obj.derive === 'function';
 };
 
diff --git a/lib/bcoin/headers.js b/lib/bcoin/headers.js
index 41d3ea47..3922256a 100644
--- a/lib/bcoin/headers.js
+++ b/lib/bcoin/headers.js
@@ -79,7 +79,7 @@ Headers.prototype.getSize = function getSize() {
 
 Headers.prototype.getRaw = function getRaw() {
   if (!this._raw) {
-    this._raw = bcoin.protocol.framer.headers(this);
+    this._raw = bcoin.protocol.framer.headers([this]);
     this._size = this._raw.length;
   }
   return this._raw;
@@ -95,7 +95,6 @@ Headers.prototype.inspect = function inspect() {
   var copy = bcoin.headers(this);
   copy.__proto__ = null;
   delete copy._raw;
-  delete copy._chain;
   copy.hash = this.hash('hex');
   copy.rhash = this.rhash;
   copy.date = new Date((copy.ts || 0) * 1000).toISOString();
@@ -131,7 +130,7 @@ Headers._fromRaw = function _fromRaw(data, enc) {
   if (enc === 'hex')
     data = new Buffer(data, 'hex');
 
-  return bcoin.protocol.parser.parseHeaders(data);
+  return bcoin.protocol.parser.parseHeaders(data)[0];
 };
 
 /**
diff --git a/lib/bcoin/http/client.js b/lib/bcoin/http/client.js
index ab811280..66f89646 100644
--- a/lib/bcoin/http/client.js
+++ b/lib/bcoin/http/client.js
@@ -335,7 +335,7 @@ Client.prototype.getWallet = function getWallet(id, passphrase, callback) {
       return callback(e);
     }
 
-    json.provider = new bcoin.http.provider(self.url);
+    json.provider = new bcoin.http.provider(self.uri);
 
     return callback(null, new bcoin.wallet(json));
   });
@@ -361,7 +361,7 @@ Client.prototype.createWallet = function createWallet(options, callback) {
       return callback(e);
     }
 
-    json.provider = new bcoin.http.provider(self.url);
+    json.provider = new bcoin.http.provider(self.uri);
 
     return callback(null, new bcoin.wallet(json));
   });
@@ -435,7 +435,7 @@ Client.prototype.getWalletPending = function getPending(id, callback) {
 
     try {
       body = body.map(function(data) {
-        return bcoin.coin.fromJSON(data);
+        return bcoin.tx.fromJSON(data);
       });
     } catch (e) {
       return callback(e);
@@ -474,7 +474,7 @@ Client.prototype.getWalletBalance = function getBalance(id, callback) {
  * @param {Function} callback - Returns [Error, {@link TX}[]].
  */
 
-Client.prototype.getWalletLast = function getLast(id, limit, callback) {
+Client.prototype.getWalletLast = function getWalletLast(id, limit, callback) {
   var options = { limit: limit };
   return this._get('/wallet/' + id + '/tx/last', options, function(err, body) {
     if (err)
diff --git a/lib/bcoin/http/provider.js b/lib/bcoin/http/provider.js
index 7d9de7f8..27ef873f 100644
--- a/lib/bcoin/http/provider.js
+++ b/lib/bcoin/http/provider.js
@@ -20,14 +20,14 @@ var Client = bcoin.http.client;
  * @param {String} uri
  */
 
-function Provider(url) {
+function Provider(uri) {
   if (!(this instanceof Provider))
-    return new Provider(url);
+    return new Provider(uri);
 
   EventEmitter.call(this);
 
-  this.client = new Client(url);
-  this.url = url;
+  this.client = new Client(uri);
+  this.uri = uri;
   this.id = null;
   this._init();
 }
diff --git a/lib/bcoin/keypair.js b/lib/bcoin/keypair.js
index 27851e7d..ddd83381 100644
--- a/lib/bcoin/keypair.js
+++ b/lib/bcoin/keypair.js
@@ -169,7 +169,7 @@ KeyPair._fromSecret = function _fromSecret(secret) {
 
   privateKey = p.readBytes(32);
 
-  if (p.left() > 1) {
+  if (p.left() > 4) {
     assert(p.readU8() === 1);
     compressed = true;
   }
diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index 7aba09a6..3ed3c79e 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -80,7 +80,6 @@ function Mempool(options) {
   this.relayPriority = this.options.relayPriority !== false;
   this.requireStandard = this.options.requireStandard !== false;
   this.rejectInsaneFees = this.options.rejectInsaneFees !== false;
-  this.relay = this.options.relay || false;
 
   // Use an in-memory binary search tree by default
   this.backend = this.options.memory === false ? 'leveldb' : 'memory';
diff --git a/lib/bcoin/output.js b/lib/bcoin/output.js
index d2c41b2e..4fb86457 100644
--- a/lib/bcoin/output.js
+++ b/lib/bcoin/output.js
@@ -32,7 +32,7 @@ function Output(options, tx) {
   value = options.value;
 
   if (typeof value === 'number') {
-    assert(value % 1 === 0);
+    assert(value % 1 === 0, 'Output value cannot be a float.');
     value = new bn(value);
   }
 
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index 1ff0e6a0..921b6f76 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -296,10 +296,6 @@ Framer.prototype.getBlocks = function getBlocks(data) {
   return this.packet('getblocks', Framer.getBlocks(data));
 };
 
-Framer.prototype.utxo = function _coin(coin) {
-  return this.packet('utxo', Framer.coin(coin, false));
-};
-
 /**
  * Create a tx packet with a header.
  * @param {TX} tx - See {@link Framer.tx}.
@@ -356,8 +352,8 @@ Framer.prototype.merkleBlock = function merkleBlock(block) {
  * @returns {Buffer} headers packet.
  */
 
-Framer.prototype.headers = function headers(block) {
-  return this.packet('headers', Framer.headers(block));
+Framer.prototype.headers = function _headers(headers) {
+  return this.packet('headers', Framer.headers(headers));
 };
 
 /**
@@ -640,26 +636,6 @@ Framer._getBlocks = function _getBlocks(data, writer, headers) {
   return p;
 };
 
-Framer.utxo = function _utxo(coin, writer) {
-  var p = new BufferWriter(writer);
-  var height = coin.height;
-
-  if (height === -1)
-    height = 0x7fffffff;
-
-  assert(coin.value.byteLength() <= 8);
-
-  p.writeU32(coin.version);
-  p.writeU32(height);
-  p.write64(coin.value);
-  Framer.script(coin.script, p);
-
-  if (!writer)
-    p = p.render();
-
-  return p;
-};
-
 /**
  * Serialize a coin.
  * @param {NakedCoin|Coin} coin
@@ -1361,7 +1337,7 @@ Framer.filterClear = function filterClear() {
  * @returns {Object} In the form of `{size: Number, witnessSize: Number}`.
  */
 
-Framer.block._sizes = function blockSizes(block) {
+Framer.block.sizes = function blockSizes(block) {
   var writer = new BufferWriter();
   Framer.witnessBlock(block, writer);
   return {
@@ -1377,7 +1353,7 @@ Framer.block._sizes = function blockSizes(block) {
  * @returns {Object} In the form of `{size: Number, witnessSize: Number}`.
  */
 
-Framer.tx._sizes = function txSizes(tx) {
+Framer.tx.sizes = function txSizes(tx) {
   var writer = new BufferWriter();
   Framer.renderTX(tx, true, writer);
   return {
@@ -1393,7 +1369,7 @@ Framer.tx._sizes = function txSizes(tx) {
  */
 
 Framer.block.witnessSize = function blockWitnessSize(block) {
-  return Framer.block._sizes(block).size;
+  return Framer.block.sizes(block).size;
 };
 
 /**
@@ -1403,7 +1379,7 @@ Framer.block.witnessSize = function blockWitnessSize(block) {
  */
 
 Framer.tx.witnessSize = function txWitnessSize(tx) {
-  return Framer.tx._sizes(tx).size;
+  return Framer.tx.sizes(tx).size;
 };
 
 /**
@@ -1437,7 +1413,7 @@ Framer.tx.size = function txSize(tx) {
  */
 
 Framer.block.virtualSize = function blockVirtualSize(block) {
-  var sizes = Framer.block._sizes(block);
+  var sizes = Framer.block.sizes(block);
   var base = sizes.size - sizes.witnessSize;
   return (base * 4 + sizes.witnessSize + 3) / 4 | 0;
 };
@@ -1449,7 +1425,7 @@ Framer.block.virtualSize = function blockVirtualSize(block) {
  */
 
 Framer.tx.virtualSize = function txVirtualSize(tx) {
-  var sizes = Framer.tx._sizes(tx);
+  var sizes = Framer.tx.sizes(tx);
   var base = sizes.size - sizes.witnessSize;
   return (base * 4 + sizes.witnessSize + 3) / 4 | 0;
 };
diff --git a/lib/bcoin/protocol/parser.js b/lib/bcoin/protocol/parser.js
index 4cbff4f2..56ec359b 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -33,7 +33,6 @@ function Parser() {
   this.pendingTotal = 0;
   this.waiting = 24;
   this.packet = null;
-  this.version = constants.minVersion;
 }
 
 utils.inherits(Parser, EventEmitter);
@@ -1032,29 +1031,6 @@ Parser.parseOutput = function parseOutput(p) {
   };
 };
 
-Parser.parseUTXO = function parseUTXO(p) {
-  var version, height, value, script;
-
-  p = new BufferReader(p);
-  p.start();
-
-  version = p.readU32();
-  height = p.readU32();
-  value = p.read64();
-  script = Parser.parseScript(p);
-
-  if (height === 0x7fffffff)
-    height = -1;
-
-  return {
-    version: version,
-    height: height,
-    value: value,
-    script: script,
-    _size: p.end()
-  };
-};
-
 /**
  * @typedef {Object} NakedCoin
  * @global
diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index c97d6dd2..5d92aab8 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -825,7 +825,7 @@ Script.prototype.encode = function encode() {
  */
 
 Script.prototype.getSubscript = function getSubscript(lastSep) {
-  var res = [];
+  var code = [];
   var i;
 
   if (lastSep == null)
@@ -835,18 +835,18 @@ Script.prototype.getSubscript = function getSubscript(lastSep) {
 
   for (i = lastSep + 1; i < this.code.length; i++) {
     if (this.code[i] !== opcodes.OP_CODESEPARATOR)
-      res.push(this.code[i]);
+      code.push(this.code[i]);
   }
 
   // Optimization: avoid re-rendering
   // of the script in 99.9% of cases.
-  if (res.length === this.code.length) {
-    res = this.clone();
-    res.raw = this.raw;
-    return res;
+  if (code.length === this.code.length) {
+    code = this.clone();
+    code.raw = this.raw;
+    return code;
   }
 
-  return new Script(res);
+  return new Script(code);
 };
 
 Script.prototype._next = function _next(to, code, ip) {
@@ -1657,6 +1657,8 @@ Script.array = function(value) {
 
 Script.prototype.removeData = function removeData(data) {
   for (var i = this.code.length - 1; i >= 0; i--) {
+    if (!Buffer.isBuffer(this.code[i]))
+      continue;
     if (utils.isEqual(this.code[i], data))
       this.code.splice(i, 1);
   }
@@ -3452,9 +3454,7 @@ Script.sign = function sign(msg, key, type) {
 
   // Add the sighash type as a single byte
   // to the signature.
-  sig = Buffer.concat([sig, new Buffer([type])]);
-
-  return sig;
+  return Buffer.concat([sig, new Buffer([type])]);
 };
 
 /**
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index bde0eff6..3c381556 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -277,7 +277,7 @@ TX.prototype.getRaw = function getRaw() {
   else
     raw = bcoin.protocol.framer.tx(this);
 
-  // this._raw = raw;
+  this._raw = raw;
   this._size = raw.length;
   this._witnessSize = raw._witnessSize;
 
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index b5271459..b01eba71 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -776,11 +776,11 @@ Wallet.prototype.fillCoins = function fillCoins(tx, callback) {
  * @param {Function} callback - Returns [Error, {@link Coin}].
  */
 
-Wallet.prototype.getCoin = function getCoin(id, callback) {
+Wallet.prototype.getCoin = function getCoin(hash, index, callback) {
   if (!this.provider)
     return callback(new Error('No wallet provider available.'));
 
-  return this.provider.getCoin(id, callback);
+  return this.provider.getCoin(hash, index, callback);
 };
 
 /**
diff --git a/lib/bcoin/walletdb.js b/lib/bcoin/walletdb.js
index fb55c9f1..bb5f51ae 100644
--- a/lib/bcoin/walletdb.js
+++ b/lib/bcoin/walletdb.js
@@ -1162,8 +1162,8 @@ Provider.prototype.update = function update(wallet, address) {
  * @param {Function} callback
  */
 
-Provider.prototype.zap = function zap(wallet, address) {
-  return this.db.zapWallet(wallet, address);
+Provider.prototype.zap = function zap(now, age, callback) {
+  return this.db.zapWallet(this.id, now, age, callback);
 };
 
 WalletDB.Provider = Provider;