diff --git a/.jshintrc b/.jshintrc
index 70a62818..2a7b0344 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -39,5 +39,11 @@
   "quotmark": "single",
 
   "laxbreak": true,
-  "laxcomma": true
+  "laxcomma": true,
+
+  "predef": [
+    "it",
+    "describe",
+    "beforeEach"
+  ]
 }
diff --git a/bench/coin-old.js b/bench/coin-old.js
index fee23fae..ede6d754 100644
--- a/bench/coin-old.js
+++ b/bench/coin-old.js
@@ -1,12 +1,7 @@
 'use strict';
 
-var BN = require('bn.js');
-var constants = require('../lib/protocol/constants');
-var util = require('../lib/utils/util');
-var assert = require('assert');
-var scriptTypes = constants.scriptTypes;
-var bench = require('./bench');
 var fs = require('fs');
+var bench = require('./bench');
 var Coins = require('../lib/blockchain/coins-old');
 var TX = require('../lib/primitives/tx');
 
diff --git a/bench/coin.js b/bench/coin.js
index 4a4f9748..0e44fa86 100644
--- a/bench/coin.js
+++ b/bench/coin.js
@@ -1,17 +1,14 @@
 'use strict';
 
 var fs = require('fs');
-var assert = require('assert');
-var util = require('../lib/utils/util');
 var Coins = require('../lib/blockchain/coins');
 var TX = require('../lib/primitives/tx');
 var bench = require('./bench');
 
-var wtx = fs.readFileSync(__dirname + '/../test/data/wtx.hex', 'utf8');
-var i, j, coins, raw, end;
-
-wtx = TX.fromRaw(wtx.trim(), 'hex');
-coins = Coins.fromTX(wtx);
+var raw = fs.readFileSync(__dirname + '/../test/data/wtx.hex', 'utf8');
+var wtx = TX.fromRaw(raw.trim(), 'hex');
+var coins = Coins.fromTX(wtx);
+var i, j, end, hash;
 
 end = bench('serialize');
 for (i = 0; i < 10000; i++)
@@ -31,8 +28,8 @@ end(i);
 
 coins = Coins.fromRaw(raw);
 end = bench('get');
-
-for (i = 0; i < 10000; i++)
+for (i = 0; i < 10000; i++) {
   for (j = 0; j < coins.outputs.length; j++)
     coins.get(j);
+}
 end(i * coins.outputs.length);
diff --git a/bench/script.js b/bench/script.js
index 435e503e..e0b0a655 100644
--- a/bench/script.js
+++ b/bench/script.js
@@ -1,9 +1,7 @@
 'use strict';
 
-var fs = require('fs');
 var assert = require('assert');
 var constants = require('../lib/protocol/constants');
-var util = require('../lib/utils/util');
 var crypto = require('../lib/crypto/crypto');
 var Script = require('../lib/script/script');
 var bench = require('./bench');
diff --git a/bench/tx.js b/bench/tx.js
index e27c19e6..c84122e9 100644
--- a/bench/tx.js
+++ b/bench/tx.js
@@ -1,7 +1,6 @@
 'use strict';
 
 var fs = require('fs');
-var assert = require('assert');
 var Block = require('../lib/primitives/block');
 var Address = require('../lib/primitives/address');
 var TX = require('../lib/primitives/tx');
@@ -10,7 +9,6 @@ var Coin = require('../lib/primitives/coin');
 var CoinView = require('../lib/blockchain/coinview');
 var constants = require('../lib/protocol/constants');
 var crypto = require('../lib/crypto/crypto');
-var util = require('../lib/utils/util');
 var bench = require('./bench');
 
 var json = require('../test/data/block300025.json');
diff --git a/bench/walletdb.js b/bench/walletdb.js
index 646674e0..49d6e667 100644
--- a/bench/walletdb.js
+++ b/bench/walletdb.js
@@ -1,7 +1,5 @@
 'use strict';
 
-var assert = require('assert');
-var util = require('../lib/utils/util');
 var bench = require('./bench');
 var co = require('../lib/utils/co');
 var crypto = require('../lib/crypto/crypto');
@@ -64,7 +62,7 @@ runBench = co(function* runBench() {
   // TX deposit
   jobs = [];
   for (i = 0; i < 10000; i++) {
-    tx = MTX()
+    tx = new MTX()
       .addInput(dummy())
       .addOutput(addrs[(i + 0) % addrs.length], 50460)
       .addOutput(addrs[(i + 1) % addrs.length], 50460)
@@ -82,7 +80,7 @@ runBench = co(function* runBench() {
   // TX redemption
   jobs = [];
   for (i = 0; i < 10000; i++) {
-    tx = MTX()
+    tx = new MTX()
       .addInput(tx, 0)
       .addInput(tx, 1)
       .addInput(tx, 2)
diff --git a/lib/blockchain/chain.js b/lib/blockchain/chain.js
index 1917ffc6..1a34dadd 100644
--- a/lib/blockchain/chain.js
+++ b/lib/blockchain/chain.js
@@ -816,7 +816,7 @@ Chain.prototype.reorganizeSPV = co(function* reorganizeSPV(competitor, block) {
   var fork = yield this.findFork(tip, competitor);
   var disconnect = [];
   var entry = tip;
-  var i, block, view;
+  var i, headers, view;
 
   assert(fork, 'No free space or data corruption.');
 
@@ -837,9 +837,9 @@ Chain.prototype.reorganizeSPV = co(function* reorganizeSPV(competitor, block) {
   // the chain has successfully reset.
   for (i = 0; i < disconnect.length; i++) {
     entry = disconnect[i];
-    block = entry.toHeaders();
+    headers = entry.toHeaders();
     view = new CoinView();
-    this.emit('disconnect', entry, block, view);
+    this.emit('disconnect', entry, headers, view);
   }
 
   this.emit('reorganize', block, tip.height, tip.hash);
diff --git a/lib/blockchain/chaindb.js b/lib/blockchain/chaindb.js
index ad2cdc32..dd118478 100644
--- a/lib/blockchain/chaindb.js
+++ b/lib/blockchain/chaindb.js
@@ -1352,12 +1352,12 @@ ChainDB.prototype._reconnect = co(function* reconnect(entry, block, view) {
  */
 
 ChainDB.prototype.disconnect = co(function* disconnect(entry, block) {
-  var block;
+  var view;
 
   this.start();
 
   try {
-    block = yield this._disconnect(entry, block);
+    view = yield this._disconnect(entry, block);
   } catch (e) {
     this.drop();
     throw e;
@@ -1365,7 +1365,7 @@ ChainDB.prototype.disconnect = co(function* disconnect(entry, block) {
 
   yield this.commit();
 
-  return block;
+  return view;
 });
 
 /**
diff --git a/lib/script/scriptnum.js b/lib/script/scriptnum.js
index 2e19a46e..3c3d40b3 100644
--- a/lib/script/scriptnum.js
+++ b/lib/script/scriptnum.js
@@ -384,22 +384,6 @@ ScriptNum.prototype.toRaw = function toRaw() {
   return data;
 };
 
-/*
- * Helpers
- */
-
-function isDecimal(obj) {
-  return typeof obj === 'string'
-    && obj.length > 0
-    && /^\-?[0-9]+$/i.test(obj);
-}
-
-function isHex(obj) {
-  return typeof obj === 'string'
-    && obj.length > 0
-    && /^\-?[0-9a-f]+$/i.test(obj);
-}
-
 /*
  * Expose
  */
diff --git a/test/aes-test.js b/test/aes-test.js
index 838d7979..af6f9426 100644
--- a/test/aes-test.js
+++ b/test/aes-test.js
@@ -1,7 +1,6 @@
 'use strict';
 
 var assert = require('assert');
-var util = require('../lib/utils/util');
 var crypto = require('../lib/crypto/crypto');
 var aes = require('../lib/crypto/aes');
 var nativeCrypto = require('crypto');
@@ -58,7 +57,7 @@ describe('AES', function() {
   }
 
   function bencrypt(data, passphrase) {
-    var key, cipher;
+    var key;
 
     assert(nativeCrypto, 'No crypto module available.');
     assert(passphrase, 'No passphrase.');
@@ -74,7 +73,7 @@ describe('AES', function() {
   }
 
   function bdecrypt(data, passphrase) {
-    var key, decipher;
+    var key;
 
     assert(nativeCrypto, 'No crypto module available.');
     assert(passphrase, 'No passphrase.');
@@ -90,7 +89,7 @@ describe('AES', function() {
   }
 
   function encrypt(data, passphrase) {
-    var key, cipher;
+    var key;
 
     assert(nativeCrypto, 'No crypto module available.');
     assert(passphrase, 'No passphrase.');
@@ -107,7 +106,7 @@ describe('AES', function() {
   }
 
   function decrypt(data, passphrase) {
-    var key, decipher;
+    var key;
 
     assert(nativeCrypto, 'No crypto module available.');
     assert(passphrase, 'No passphrase.');
diff --git a/test/bip150-test.js b/test/bip150-test.js
index 65b67db7..528d2ce3 100644
--- a/test/bip150-test.js
+++ b/test/bip150-test.js
@@ -1,8 +1,6 @@
 'use strict';
 
 var assert = require('assert');
-var util = require('../lib/utils/util');
-var crypto = require('../lib/crypto/crypto');
 var ec = require('../lib/crypto/ec');
 var BIP150 = require('../lib/net/bip150');
 var BIP151 = require('../lib/net/bip151');
@@ -28,8 +26,10 @@ describe('BIP150', function() {
   it('should do encinit', function() {
     var init = server.toEncinit();
     client.encinit(init.publicKey, init.cipher);
-    var init = client.toEncinit();
+
+    init = client.toEncinit();
     server.encinit(init.publicKey, init.cipher);
+
     assert(!client.handshake);
     assert(!server.handshake);
   });
@@ -49,12 +49,15 @@ describe('BIP150', function() {
   });
 
   it('should do BIP150 handshake', function() {
-    var challenge = client.bip150.toChallenge();
-    var reply = server.bip150.challenge(challenge.hash);
-    var propose = client.bip150.reply(reply);
-    var challenge = server.bip150.propose(propose);
-    var reply = client.bip150.challenge(challenge);
-    var result = server.bip150.reply(reply);
+    var challenge, reply, propose, result;
+
+    challenge = client.bip150.toChallenge();
+    reply = server.bip150.challenge(challenge.hash);
+    propose = client.bip150.reply(reply);
+    challenge = server.bip150.propose(propose);
+    reply = client.bip150.challenge(challenge);
+    result = server.bip150.reply(reply);
+
     assert(!result);
     assert(client.bip150.auth);
     assert(server.bip150.auth);
diff --git a/test/bip151-test.js b/test/bip151-test.js
index ed89abce..bfb44724 100644
--- a/test/bip151-test.js
+++ b/test/bip151-test.js
@@ -14,8 +14,10 @@ describe('BIP151', function() {
   it('should do encinit', function() {
     var init = server.toEncinit();
     client.encinit(init.publicKey, init.cipher);
-    var init = client.toEncinit();
+
+    init = client.toEncinit();
     server.encinit(init.publicKey, init.cipher);
+
     assert(!client.handshake);
     assert(!server.handshake);
   });
diff --git a/test/bip70-test.js b/test/bip70-test.js
index 7da84682..7388babb 100644
--- a/test/bip70-test.js
+++ b/test/bip70-test.js
@@ -2,7 +2,6 @@
 
 var assert = require('assert');
 var util = require('../lib/utils/util');
-var crypto = require('../lib/crypto/crypto');
 var bip70 = require('../lib/bip70');
 var Address = require('../lib/primitives/address');
 var x509 = bip70.x509;
diff --git a/test/block-test.js b/test/block-test.js
index 761b38d9..37e7a44e 100644
--- a/test/block-test.js
+++ b/test/block-test.js
@@ -2,14 +2,11 @@
 
 var fs = require('fs');
 var assert = require('assert');
-var util = require('../lib/utils/util');
 var btcutils = require('../lib/btc/utils');
-var crypto = require('../lib/crypto/crypto');
 var Bloom = require('../lib/utils/bloom');
 var Block = require('../lib/primitives/block');
 var Headers = require('../lib/primitives/headers');
 var MerkleBlock = require('../lib/primitives/merkleblock');
-var TX = require('../lib/primitives/tx');
 var CoinView = require('../lib/blockchain/coinview');
 var Coin = require('../lib/primitives/coin');
 var constants = require('../lib/protocol/constants');
diff --git a/test/bloom-test.js b/test/bloom-test.js
index bf626ea2..80a13605 100644
--- a/test/bloom-test.js
+++ b/test/bloom-test.js
@@ -1,9 +1,7 @@
 'use strict';
 
 var assert = require('assert');
-var util = require('../lib/utils/util');
 var constants = require('../lib/protocol/constants');
-var crypto = require('../lib/crypto/crypto');
 var Bloom = require('../lib/utils/bloom');
 var murmur3 = require('../lib/utils/murmur3');
 
diff --git a/test/chain-test.js b/test/chain-test.js
index 5910fc5e..a8c0c729 100644
--- a/test/chain-test.js
+++ b/test/chain-test.js
@@ -3,23 +3,17 @@
 var assert = require('assert');
 var BN = require('bn.js');
 var constants = require('../lib/protocol/constants');
-var util = require('../lib/utils/util');
 var co = require('../lib/utils/co');
-var crypto = require('../lib/crypto/crypto');
-var CoinView = require('../lib/blockchain/coinview');
 var Coin = require('../lib/primitives/coin');
 var Script = require('../lib/script/script');
 var FullNode = require('../lib/node/fullnode');
-var TX = require('../lib/primitives/tx');
 var MTX = require('../lib/primitives/mtx');
 // var Client = require('../lib/wallet/client');
-var opcodes = constants.opcodes;
 var cob = co.cob;
 
 describe('Chain', function() {
   var node = new FullNode({ db: 'memory', apiKey: 'foo', network: 'regtest' });
   var chain = node.chain;
-  var mempool = node.mempool;
   var walletdb = node.walletdb;
   var miner = node.miner;
   var wallet, tip1, tip2, cb1, cb2, mineBlock;
@@ -105,11 +99,11 @@ describe('Chain', function() {
     }
   }));
 
-  it('should have correct chain value', cob(function* () {
+  it('should have correct chain value', function() {
     assert.equal(chain.db.state.value, 55000000000);
     assert.equal(chain.db.state.coin, 20);
     assert.equal(chain.db.state.tx, 21);
-  }));
+  });
 
   it('should have correct balance', cob(function* () {
     var balance;
@@ -146,11 +140,11 @@ describe('Chain', function() {
     assert(chain.tip.chainwork.cmp(tip1.chainwork) > 0);
   }));
 
-  it('should have correct chain value', cob(function* () {
+  it('should have correct chain value', function() {
     assert.equal(chain.db.state.value, 60000000000);
     assert.equal(chain.db.state.coin, 21);
     assert.equal(chain.db.state.tx, 22);
-  }));
+  });
 
   it('should have correct balance', cob(function* () {
     var balance;
@@ -213,11 +207,11 @@ describe('Chain', function() {
     assert(chain.tip === tip);
   }));
 
-  it('should have correct chain value', cob(function* () {
+  it('should have correct chain value', function() {
     assert.equal(chain.db.state.value, 65000000000);
     assert.equal(chain.db.state.coin, 23);
     assert.equal(chain.db.state.tx, 24);
-  }));
+  });
 
   it('should get coin', cob(function* () {
     var block, tx, output, coin;
diff --git a/test/data/hd.json b/test/data/hd.json
new file mode 100644
index 00000000..7238f085
--- /dev/null
+++ b/test/data/hd.json
@@ -0,0 +1,72 @@
+{
+  "vector1": {
+    "seed": "000102030405060708090a0b0c0d0e0f",
+    "m": {
+      "pub": "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
+      "prv": "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi"
+    },
+    "m/0'": {
+      "pub": "xpub68Gmy5EdvgibQVfPdqkBBCHxA5htiqg55crXYuXoQRKfDBFA1WEjWgP6LHhwBZeNK1VTsfTFUHCdrfp1bgwQ9xv5ski8PX9rL2dZXvgGDnw",
+      "prv": "xprv9uHRZZhk6KAJC1avXpDAp4MDc3sQKNxDiPvvkX8Br5ngLNv1TxvUxt4cV1rGL5hj6KCesnDYUhd7oWgT11eZG7XnxHrnYeSvkzY7d2bhkJ7"
+    },
+    "m/0'/1": {
+      "pub": "xpub6ASuArnXKPbfEwhqN6e3mwBcDTgzisQN1wXN9BJcM47sSikHjJf3UFHKkNAWbWMiGj7Wf5uMash7SyYq527Hqck2AxYysAA7xmALppuCkwQ",
+      "prv": "xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs"
+    },
+    "m/0'/1/2'": {
+      "pub": "xpub6D4BDPcP2GT577Vvch3R8wDkScZWzQzMMUm3PWbmWvVJrZwQY4VUNgqFJPMM3No2dFDFGTsxxpG5uJh7n7epu4trkrX7x7DogT5Uv6fcLW5",
+      "prv": "xprv9z4pot5VBttmtdRTWfWQmoH1taj2axGVzFqSb8C9xaxKymcFzXBDptWmT7FwuEzG3ryjH4ktypQSAewRiNMjANTtpgP4mLTj34bhnZX7UiM"
+    },
+    "m/0'/1/2'/2": {
+      "pub": "xpub6FHa3pjLCk84BayeJxFW2SP4XRrFd1JYnxeLeU8EqN3vDfZmbqBqaGJAyiLjTAwm6ZLRQUMv1ZACTj37sR62cfN7fe5JnJ7dh8zL4fiyLHV",
+      "prv": "xprvA2JDeKCSNNZky6uBCviVfJSKyQ1mDYahRjijr5idH2WwLsEd4Hsb2Tyh8RfQMuPh7f7RtyzTtdrbdqqsunu5Mm3wDvUAKRHSC34sJ7in334"
+    },
+    "m/0'/1/2'/2/1000000000": {
+      "pub": "xpub6H1LXWLaKsWFhvm6RVpEL9P4KfRZSW7abD2ttkWP3SSQvnyA8FSVqNTEcYFgJS2UaFcxupHiYkro49S8yGasTvXEYBVPamhGW6cFJodrTHy",
+      "prv": "xprvA41z7zogVVwxVSgdKUHDy1SKmdb533PjDz7J6N6mV6uS3ze1ai8FHa8kmHScGpWmj4WggLyQjgPie1rFSruoUihUZREPSL39UNdE3BBDu76"
+    }
+  },
+  "vector2": {
+    "seed": "fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542",
+    "m": {
+      "pub": "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB",
+      "prv": "xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U"
+    },
+    "m/0": {
+      "pub": "xpub69H7F5d8KSRgmmdJg2KhpAK8SR3DjMwAdkxj3ZuxV27CprR9LgpeyGmXUbC6wb7ERfvrnKZjXoUmmDznezpbZb7ap6r1D3tgFxHmwMkQTPH",
+      "prv": "xprv9vHkqa6EV4sPZHYqZznhT2NPtPCjKuDKGY38FBWLvgaDx45zo9WQRUT3dKYnjwih2yJD9mkrocEZXo1ex8G81dwSM1fwqWpWkeS3v86pgKt"
+    },
+    "m/0/2147483647'": {
+      "pub": "xpub6ASAVgeehLbnwdqV6UKMHVzgqAG8Gr6riv3Fxxpj8ksbH9ebxaEyBLZ85ySDhKiLDBrQSARLq1uNRts8RuJiHjaDMBU4Zn9h8LZNnBC5y4a",
+      "prv": "xprv9wSp6B7kry3Vj9m1zSnLvN3xH8RdsPP1Mh7fAaR7aRLcQMKTR2vidYEeEg2mUCTAwCd6vnxVrcjfy2kRgVsFawNzmjuHc2YmYRmagcEPdU9"
+    },
+    "m/0/2147483647'/1": {
+      "pub": "xpub6DF8uhdarytz3FWdA8TvFSvvAh8dP3283MY7p2V4SeE2wyWmG5mg5EwVvmdMVCQcoNJxGoWaU9DCWh89LojfZ537wTfunKau47EL2dhHKon",
+      "prv": "xprv9zFnWC6h2cLgpmSA46vutJzBcfJ8yaJGg8cX1e5StJh45BBciYTRXSd25UEPVuesF9yog62tGAQtHjXajPPdbRCHuWS6T8XA2ECKADdw4Ef"
+    },
+    "m/0/2147483647'/1/2147483646'": {
+      "pub": "xpub6ERApfZwUNrhLCkDtcHTcxd75RbzS1ed54G1LkBUHQVHQKqhMkhgbmJbZRkrgZw4koxb5JaHWkY4ALHY2grBGRjaDMzQLcgJvLJuZZvRcEL",
+      "prv": "xprvA1RpRA33e1JQ7ifknakTFpgNXPmW2YvmhqLQYMmrj4xJXXWYpDPS3xz7iAxn8L39njGVyuoseXzU6rcxFLJ8HFsTjSyQbLYnMpCqE2VbFWc"
+    },
+    "m/0/2147483647'/1/2147483646'/2": {
+      "pub": "xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt",
+      "prv": "xprvA2nrNbFZABcdryreWet9Ea4LvTJcGsqrMzxHx98MMrotbir7yrKCEXw7nadnHM8Dq38EGfSh6dqA9QWTyefMLEcBYJUuekgW4BYPJcr9E7j"
+    }
+  },
+  "phrase": "volume doll flush federal inflict tomato result property total curtain shield aisle",
+  "seed": "5559092716434b83f158bffb51337a944529ae30d7e62d46d3be0c66fa4b36e8d60ccfd2c976b831885dc9df9ac3716ee4bf90003f25621070a49cbea58f528b",
+  "master_priv": "xprv9s21ZrQH143K35zTejeVRhkXgegDFUVpoh8Mxs2BQmXEB4w9SZ1CuoJPuQ2KGQrS1ZF3Pk7V7KWHn7FqR2JbAE9Bh8PURnrFnrmArj4kxos",
+  "master_pub": "xpub661MyMwAqRbcFa4vkmBVnqhGEgWhewDgAv3xmFRny74D3sGHz6KTTbcskg2vZEMbEwxc4oaR435oczhSu4GdNwhwiVewcewU8A1Rr6HehAU",
+  "child1_priv": "xprv9v414VeuxMoGt3t7jzkPni79suCfkgFwjxG38X2wgfg2mrYtV4Bhj3prhDDCcBiJrz9n4xLYoDtBFRuQmreVLKzmiZAqvbGpx5q4yHfzfah",
+  "child1_pub": "xpub693MU1BonjMa6Xxar2HQ9r3tRw3AA8yo7BBdvuSZF1D1eet32bVxGr9LYViWMtaLfQaa2StXeUmDG5VELFkU9pc3yfTzCk61WQJdR6ezj7a",
+  "child2_pub": "xpub693MU1BonjMa8MMoz9opJhrFejcXcGmhMP9gzySLsip4Dz1UrSLT4i2pAimHDyM2onW2H2L2HkbwrZqoizQLMoErXu8mPYxDf8tJUBAfBuT",
+  "child3_priv": "xprv9v414VeuxMoGusHLt8GowZuX6hn3Cp3qzAE6Cb2jKPH5MBgLJu2CWuiLKTdWV8WoNFYvpCcBfbpWfeyEQ8zytZW5qy39roTcugBGUkeAvCc",
+  "child3_pub": "xpub693MU1BonjMa8MMoz9opJhrFejcXcGmhMP9gzySLsip4Dz1UrSLT4i2pAimHDyM2onW2H2L2HkbwrZqoizQLMoErXu8mPYxDf8tJUBAfBuT",
+  "child4_priv": "xprv9v414VeuxMoGyViVYuzEN5vLDzff3nkrH5Bf4KzD1iTeY855Q4cCc6xPPNoc6MJcsqqRQiGqR977cEEGK2mhVp7ALKHqY1icEw3Q9UmfQ1v",
+  "child4_pub": "xpub693MU1BonjMaBynxewXEjDs4n2W9TFUheJ7FriPpa3zdQvQDwbvT9uGsEebvioAcYbtRUU7ge4yVgj8WDLrwtwuXKTWiieFoYX2B1JYUEfK",
+  "child5_priv": "xprv9xaK29Nm86ytEwsV9YSsL3jWYR6KtZYY3cKdjAbxHrwKyxH9YWoxvqKwtgQmExGpxAEDrwB4WK9YG1iukth3XiSgsxXLK1W3NB31gLee8fi",
+  "child5_pub": "xpub6BZfReuexUYBTRwxFZyshBgF6SvpJ2GPQqFEXZ1ZrCUJrkcJ648DUdeRjx9QiNQxQvPcHYV3rGkvuExFQbVRS4kU5ynx4fAsWWhHgyPh1pP",
+  "child6_priv": "xprv9xaK29Nm86ytGx9uDhNKUBjvbJ1sAEM11aYxGQS66Rmg6oHwy7HbB6kWwMHvukzdbPpGhfNXhZgePWFHm1DCh5PACPFywJJKr1AnUJTLjUc",
+  "child6_pub": "xpub6BZfReuexUYBVSENKiuKqKgf9KrMZh4rNoUZ4nqhemJeybd6Webqiu4zndBwa9UB4Jvr5jB5Bcgng6reXAKCuDiVm7zhzJ13BUDBiM8HidZ",
+  "zero_priv": "xprv9s21ZrQH143K3ckY9DgU79uMTJkQRLdbCCVDh81SnxTgPzLLGax6uHeBULTtaEtcAvKjXfT7ZWtHzKjTpujMkUd9dDb8msDeAfnJxrgAYhr"
+}
diff --git a/test/hd-test.js b/test/hd-test.js
index 3c6066b1..8048b0b2 100644
--- a/test/hd-test.js
+++ b/test/hd-test.js
@@ -1,148 +1,81 @@
 'use strict';
 
 var assert = require('assert');
-var util = require('../lib/utils/util');
 var HD = require('../lib/hd');
 var base58 = require('../lib/utils/base58');
 var crypto = require('../lib/crypto/crypto');
+var vectors = require('./data/hd.json');
+var vector1 = vectors.vector1;
+var vector2 = vectors.vector2;
 
-// https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
-var vector1 = {
-  'seed': '000102030405060708090a0b0c0d0e0f',
-  'm': {
-    'pub': 'xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8',
-    'prv': 'xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi'
-  },
-  'm/0\'': {
-    'pub': 'xpub68Gmy5EdvgibQVfPdqkBBCHxA5htiqg55crXYuXoQRKfDBFA1WEjWgP6LHhwBZeNK1VTsfTFUHCdrfp1bgwQ9xv5ski8PX9rL2dZXvgGDnw',
-    'prv': 'xprv9uHRZZhk6KAJC1avXpDAp4MDc3sQKNxDiPvvkX8Br5ngLNv1TxvUxt4cV1rGL5hj6KCesnDYUhd7oWgT11eZG7XnxHrnYeSvkzY7d2bhkJ7'
-  },
-  'm/0\'/1': {
-    'pub': 'xpub6ASuArnXKPbfEwhqN6e3mwBcDTgzisQN1wXN9BJcM47sSikHjJf3UFHKkNAWbWMiGj7Wf5uMash7SyYq527Hqck2AxYysAA7xmALppuCkwQ',
-    'prv': 'xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs'
-  },
-  'm/0\'/1/2\'': {
-    'pub': 'xpub6D4BDPcP2GT577Vvch3R8wDkScZWzQzMMUm3PWbmWvVJrZwQY4VUNgqFJPMM3No2dFDFGTsxxpG5uJh7n7epu4trkrX7x7DogT5Uv6fcLW5',
-    'prv': 'xprv9z4pot5VBttmtdRTWfWQmoH1taj2axGVzFqSb8C9xaxKymcFzXBDptWmT7FwuEzG3ryjH4ktypQSAewRiNMjANTtpgP4mLTj34bhnZX7UiM'
-  },
-  'm/0\'/1/2\'/2': {
-    'pub': 'xpub6FHa3pjLCk84BayeJxFW2SP4XRrFd1JYnxeLeU8EqN3vDfZmbqBqaGJAyiLjTAwm6ZLRQUMv1ZACTj37sR62cfN7fe5JnJ7dh8zL4fiyLHV',
-    'prv': 'xprvA2JDeKCSNNZky6uBCviVfJSKyQ1mDYahRjijr5idH2WwLsEd4Hsb2Tyh8RfQMuPh7f7RtyzTtdrbdqqsunu5Mm3wDvUAKRHSC34sJ7in334'
-  },
-  'm/0\'/1/2\'/2/1000000000': {
-    'pub': 'xpub6H1LXWLaKsWFhvm6RVpEL9P4KfRZSW7abD2ttkWP3SSQvnyA8FSVqNTEcYFgJS2UaFcxupHiYkro49S8yGasTvXEYBVPamhGW6cFJodrTHy',
-    'prv': 'xprvA41z7zogVVwxVSgdKUHDy1SKmdb533PjDz7J6N6mV6uS3ze1ai8FHa8kmHScGpWmj4WggLyQjgPie1rFSruoUihUZREPSL39UNdE3BBDu76'
-  }
-};
+function ub58(data) {
+  return base58.decode(data).toString('hex');
+}
 
-var vector2 = {
-  'seed': 'fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542',
-  'm': {
-    'pub': 'xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB',
-    'prv': 'xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U'
-  },
-  'm/0': {
-    'pub': 'xpub69H7F5d8KSRgmmdJg2KhpAK8SR3DjMwAdkxj3ZuxV27CprR9LgpeyGmXUbC6wb7ERfvrnKZjXoUmmDznezpbZb7ap6r1D3tgFxHmwMkQTPH',
-    'prv': 'xprv9vHkqa6EV4sPZHYqZznhT2NPtPCjKuDKGY38FBWLvgaDx45zo9WQRUT3dKYnjwih2yJD9mkrocEZXo1ex8G81dwSM1fwqWpWkeS3v86pgKt'
-  },
-  'm/0/2147483647\'': {
-    'pub': 'xpub6ASAVgeehLbnwdqV6UKMHVzgqAG8Gr6riv3Fxxpj8ksbH9ebxaEyBLZ85ySDhKiLDBrQSARLq1uNRts8RuJiHjaDMBU4Zn9h8LZNnBC5y4a',
-    'prv': 'xprv9wSp6B7kry3Vj9m1zSnLvN3xH8RdsPP1Mh7fAaR7aRLcQMKTR2vidYEeEg2mUCTAwCd6vnxVrcjfy2kRgVsFawNzmjuHc2YmYRmagcEPdU9'
-  },
-  'm/0/2147483647\'/1': {
-    'pub': 'xpub6DF8uhdarytz3FWdA8TvFSvvAh8dP3283MY7p2V4SeE2wyWmG5mg5EwVvmdMVCQcoNJxGoWaU9DCWh89LojfZ537wTfunKau47EL2dhHKon',
-    'prv': 'xprv9zFnWC6h2cLgpmSA46vutJzBcfJ8yaJGg8cX1e5StJh45BBciYTRXSd25UEPVuesF9yog62tGAQtHjXajPPdbRCHuWS6T8XA2ECKADdw4Ef'
-  },
-  'm/0/2147483647\'/1/2147483646\'': {
-    'pub': 'xpub6ERApfZwUNrhLCkDtcHTcxd75RbzS1ed54G1LkBUHQVHQKqhMkhgbmJbZRkrgZw4koxb5JaHWkY4ALHY2grBGRjaDMzQLcgJvLJuZZvRcEL',
-    'prv': 'xprvA1RpRA33e1JQ7ifknakTFpgNXPmW2YvmhqLQYMmrj4xJXXWYpDPS3xz7iAxn8L39njGVyuoseXzU6rcxFLJ8HFsTjSyQbLYnMpCqE2VbFWc'
-  },
-  'm/0/2147483647\'/1/2147483646\'/2': {
-    'pub': 'xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt',
-    'prv': 'xprvA2nrNbFZABcdryreWet9Ea4LvTJcGsqrMzxHx98MMrotbir7yrKCEXw7nadnHM8Dq38EGfSh6dqA9QWTyefMLEcBYJUuekgW4BYPJcr9E7j'
-  },
-};
+function equal(a, b) {
+  assert.equal(a, b);
+  assert.equal(ub58(a), ub58(b));
+}
 
 describe('HD', function() {
-  var phrase = 'volume doll flush federal inflict tomato result property total curtain shield aisle';
-
-  var seed = '5559092716434b83f158bffb51337a944529ae30d7e62d46d3be0c66fa4b36e8d60ccfd2c976b831885dc9df9ac3716ee4bf90003f25621070a49cbea58f528b';
-
-  var master_priv = 'xprv9s21ZrQH143K35zTejeVRhkXgegDFUVpoh8Mxs2BQmXEB4w9SZ1CuoJPuQ2KGQrS1ZF3Pk7V7KWHn7FqR2JbAE9Bh8PURnrFnrmArj4kxos';
-  var master_pub = 'xpub661MyMwAqRbcFa4vkmBVnqhGEgWhewDgAv3xmFRny74D3sGHz6KTTbcskg2vZEMbEwxc4oaR435oczhSu4GdNwhwiVewcewU8A1Rr6HehAU';
-
-  var child1_priv = 'xprv9v414VeuxMoGt3t7jzkPni79suCfkgFwjxG38X2wgfg2mrYtV4Bhj3prhDDCcBiJrz9n4xLYoDtBFRuQmreVLKzmiZAqvbGpx5q4yHfzfah';
-  var child1_pub = 'xpub693MU1BonjMa6Xxar2HQ9r3tRw3AA8yo7BBdvuSZF1D1eet32bVxGr9LYViWMtaLfQaa2StXeUmDG5VELFkU9pc3yfTzCk61WQJdR6ezj7a';
-
-  var child2_pub = 'xpub693MU1BonjMa8MMoz9opJhrFejcXcGmhMP9gzySLsip4Dz1UrSLT4i2pAimHDyM2onW2H2L2HkbwrZqoizQLMoErXu8mPYxDf8tJUBAfBuT';
-
-  var child3_priv = 'xprv9v414VeuxMoGusHLt8GowZuX6hn3Cp3qzAE6Cb2jKPH5MBgLJu2CWuiLKTdWV8WoNFYvpCcBfbpWfeyEQ8zytZW5qy39roTcugBGUkeAvCc';
-  var child3_pub = 'xpub693MU1BonjMa8MMoz9opJhrFejcXcGmhMP9gzySLsip4Dz1UrSLT4i2pAimHDyM2onW2H2L2HkbwrZqoizQLMoErXu8mPYxDf8tJUBAfBuT';
-
-  var child4_priv = 'xprv9v414VeuxMoGyViVYuzEN5vLDzff3nkrH5Bf4KzD1iTeY855Q4cCc6xPPNoc6MJcsqqRQiGqR977cEEGK2mhVp7ALKHqY1icEw3Q9UmfQ1v';
-  var child4_pub = 'xpub693MU1BonjMaBynxewXEjDs4n2W9TFUheJ7FriPpa3zdQvQDwbvT9uGsEebvioAcYbtRUU7ge4yVgj8WDLrwtwuXKTWiieFoYX2B1JYUEfK';
-
-  var child5_priv = 'xprv9xaK29Nm86ytEwsV9YSsL3jWYR6KtZYY3cKdjAbxHrwKyxH9YWoxvqKwtgQmExGpxAEDrwB4WK9YG1iukth3XiSgsxXLK1W3NB31gLee8fi';
-  var child5_pub = 'xpub6BZfReuexUYBTRwxFZyshBgF6SvpJ2GPQqFEXZ1ZrCUJrkcJ648DUdeRjx9QiNQxQvPcHYV3rGkvuExFQbVRS4kU5ynx4fAsWWhHgyPh1pP';
-
-  var child6_priv = 'xprv9xaK29Nm86ytGx9uDhNKUBjvbJ1sAEM11aYxGQS66Rmg6oHwy7HbB6kWwMHvukzdbPpGhfNXhZgePWFHm1DCh5PACPFywJJKr1AnUJTLjUc';
-  var child6_pub = 'xpub6BZfReuexUYBVSENKiuKqKgf9KrMZh4rNoUZ4nqhemJeybd6Webqiu4zndBwa9UB4Jvr5jB5Bcgng6reXAKCuDiVm7zhzJ13BUDBiM8HidZ';
-
   var master, child1, child2, child3, child4, child5, child6;
 
   it('should create a pbkdf2 seed', function() {
-    var checkSeed = crypto.pbkdf2(
-      phrase, 'mnemonic' + 'foo', 2048, 64, 'sha512').toString('hex');
-    assert.equal(checkSeed, seed);
+    var seed = crypto.pbkdf2(vectors.phrase, 'mnemonicfoo', 2048, 64, 'sha512');
+    assert.equal(seed.toString('hex'), vectors.seed);
   });
 
   it('should create master private key', function() {
-    master = HD.PrivateKey.fromSeed(new Buffer(seed, 'hex'));
-    assert.equal(master.toBase58(), master_priv);
-    assert.equal(master.toPublic().toBase58(), master_pub);
+    master = HD.PrivateKey.fromSeed(new Buffer(vectors.seed, 'hex'));
+    assert.equal(master.toBase58(), vectors.master_priv);
+    assert.equal(master.toPublic().toBase58(), vectors.master_pub);
   });
 
   it('should derive(0) child from master', function() {
     child1 = master.derive(0);
-    assert.equal(child1.toBase58(), child1_priv);
-    assert.equal(child1.toPublic().toBase58(), child1_pub);
+    assert.equal(child1.toBase58(), vectors.child1_priv);
+    assert.equal(child1.toPublic().toBase58(), vectors.child1_pub);
   });
 
   it('should derive(1) child from master public key', function() {
     child2 = master.toPublic().derive(1);
-    assert.equal(child2.toBase58(), child2_pub);
+    assert.equal(child2.toBase58(), vectors.child2_pub);
   });
 
   it('should derive(1) child from master', function() {
     child3 = master.derive(1);
-    assert.equal(child3.toBase58(), child3_priv);
-    assert.equal(child3.toPublic().toBase58(), child3_pub);
+    assert.equal(child3.toBase58(), vectors.child3_priv);
+    assert.equal(child3.toPublic().toBase58(), vectors.child3_pub);
   });
 
   it('should derive(2) child from master', function() {
     child4 = master.derive(2);
-    assert.equal(child4.toBase58(), child4_priv);
-    assert.equal(child4.toPublic().toBase58(), child4_pub);
+    assert.equal(child4.toBase58(), vectors.child4_priv);
+    assert.equal(child4.toPublic().toBase58(), vectors.child4_pub);
   });
 
   it('should derive(0) child from child(2)', function() {
     child5 = child4.derive(0);
-    assert.equal(child5.toBase58(), child5_priv);
-    assert.equal(child5.toPublic().toBase58(), child5_pub);
+    assert.equal(child5.toBase58(), vectors.child5_priv);
+    assert.equal(child5.toPublic().toBase58(), vectors.child5_pub);
   });
 
   it('should derive(1) child from child(2)', function() {
     child6 = child4.derive(1);
-    assert.equal(child6.toBase58(), child6_priv);
-    assert.equal(child6.toPublic().toBase58(), child6_pub);
+    assert.equal(child6.toBase58(), vectors.child6_priv);
+    assert.equal(child6.toPublic().toBase58(), vectors.child6_pub);
   });
 
   it('should derive correctly when private key has leading zeros', function() {
-    var key = 'xprv9s21ZrQH143K3ckY9DgU79uMTJkQRLdbCCVDh81SnxTgPzLLGax6uHeBULTtaEtcAvKjXfT7ZWtHzKjTpujMkUd9dDb8msDeAfnJxrgAYhr';
-    var hdkey = HD.PrivateKey.fromBase58(key);
-    assert.equal(hdkey.privateKey.toString('hex'), '00000055378cf5fafb56c711c674143f9b0ee82ab0ba2924f19b64f5ae7cdbfd');
-    var child = hdkey.derivePath('m/44\'/0\'/0\'/0/0\'');
-    assert.equal(child.privateKey.toString('hex'), '3348069561d2a0fb925e74bf198762acc47dce7db27372257d2d959a9e6f8aeb');
+    var key = HD.PrivateKey.fromBase58(vectors.zero_priv);
+    var child;
+
+    assert.equal(key.privateKey.toString('hex'),
+      '00000055378cf5fafb56c711c674143f9b0ee82ab0ba2924f19b64f5ae7cdbfd');
+
+    child = key.derivePath('m/44\'/0\'/0\'/0/0\'');
+    assert.equal(child.privateKey.toString('hex'),
+      '3348069561d2a0fb925e74bf198762acc47dce7db27372257d2d959a9e6f8aeb');
   });
 
   it('should deserialize master private key', function() {
@@ -158,34 +91,25 @@ describe('HD', function() {
     assert.equal(HD.fromJSON(key.toJSON()).toBase58(), key.toBase58());
   });
 
-  function ub58(data) {
-    return base58.decode(data).toString('hex');
-  }
-
-  function equal(a, b) {
-    assert.equal(a, b);
-    assert.equal(ub58(a), ub58(b));
-  }
-
   [vector1, vector2].forEach(function(vector) {
-    var seed = vector.seed;
-    var m = vector.m;
     var master;
-    delete vector.seed;
-    delete vector.m;
+
     it('should create from a seed', function() {
-      master = HD.PrivateKey.fromSeed(new Buffer(seed, 'hex'));
-      equal(master.toBase58(), m.prv);
-      equal(master.toPublic().toBase58(), m.pub);
+      master = HD.PrivateKey.fromSeed(new Buffer(vector.seed, 'hex'));
+      equal(master.toBase58(), vector.m.prv);
+      equal(master.toPublic().toBase58(), vector.m.pub);
     });
+
     Object.keys(vector).forEach(function(path) {
-      var data = vector[path];
-      var xpriv = data.prv;
-      var xpub = data.pub;
+      var kp = vector[path];
+
+      if (path === 'seed' || path === 'm')
+        return;
+
       it('should derive ' + path + ' from master', function() {
         var key = master.derive(path);
-        equal(key.toBase58(), xpriv);
-        equal(key.toPublic().toBase58(), xpub);
+        equal(key.toBase58(), kp.prv);
+        equal(key.toPublic().toBase58(), kp.pub);
       });
     });
   });
diff --git a/test/http-test.js b/test/http-test.js
index 117c29ef..7b286f19 100644
--- a/test/http-test.js
+++ b/test/http-test.js
@@ -2,15 +2,11 @@
 
 var assert = require('assert');
 var constants = require('../lib/protocol/constants');
-var network = require('../lib/protocol/networks');
-var util = require('../lib/utils/util');
-var crypto = require('../lib/crypto/crypto');
 var co = require('../lib/utils/co');
 var Amount = require('../lib/btc/amount');
 var MTX = require('../lib/primitives/mtx');
 var HTTP = require('../lib/http');
 var FullNode = require('../lib/node/fullnode');
-var scriptTypes = constants.scriptTypes;
 var cob = co.cob;
 
 var dummyInput = {
@@ -21,8 +17,7 @@ var dummyInput = {
 };
 
 describe('HTTP', function() {
-  var request = HTTP.request;
-  var node, wallet, w, addr, hash;
+  var node, wallet, addr, hash;
 
   node = new FullNode({
     network: 'regtest',
diff --git a/test/mempool-test.js b/test/mempool-test.js
index 4535f6fc..589d0946 100644
--- a/test/mempool-test.js
+++ b/test/mempool-test.js
@@ -2,7 +2,6 @@
 
 var assert = require('assert');
 var constants = require('../lib/protocol/constants');
-var util = require('../lib/utils/util');
 var crypto = require('../lib/crypto/crypto');
 var co = require('../lib/utils/co');
 var MempoolEntry = require('../lib/mempool/mempoolentry');
@@ -87,7 +86,7 @@ describe('Mempool', function() {
     var w = wallet;
     var t1, t2, t3, t4, f1, fake, prev, sig, balance, txs;
 
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 10000);
 
@@ -100,7 +99,7 @@ describe('Mempool', function() {
     yield w.sign(t1);
     t1 = t1.toTX();
 
-    t2 = MTX()
+    t2 = new MTX()
       .addInput(t1, 0) // 50000
       .addOutput(w.getAddress(), 20000)
       .addOutput(w.getAddress(), 20000);
@@ -109,7 +108,7 @@ describe('Mempool', function() {
     yield w.sign(t2);
     t2 = t2.toTX();
 
-    t3 = MTX()
+    t3 = new MTX()
       .addInput(t1, 1) // 10000
       .addInput(t2, 0) // 20000
       .addOutput(w.getAddress(), 23000);
@@ -118,7 +117,7 @@ describe('Mempool', function() {
     yield w.sign(t3);
     t3 = t3.toTX();
 
-    t4 = MTX()
+    t4 = new MTX()
       .addInput(t2, 1) // 24000
       .addInput(t3, 0) // 23000
       .addOutput(w.getAddress(), 11000)
@@ -128,7 +127,7 @@ describe('Mempool', function() {
     yield w.sign(t4);
     t4 = t4.toTX();
 
-    f1 = MTX()
+    f1 = new MTX()
       .addInput(t4, 1) // 11000
       .addOutput(new Address(), 9000);
 
@@ -136,7 +135,7 @@ describe('Mempool', function() {
     yield w.sign(f1);
     f1 = f1.toTX();
 
-    fake = MTX()
+    fake = new MTX()
       .addInput(t1, 1) // 1000 (already redeemed)
       .addOutput(w.getAddress(), 6000); // 6000 instead of 500
 
@@ -186,7 +185,7 @@ describe('Mempool', function() {
     var kp = KeyRing.generate();
     var tx, prev, prevHash, sig;
 
-    tx = MTX()
+    tx = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 10000);
 
@@ -212,7 +211,7 @@ describe('Mempool', function() {
     var kp = KeyRing.generate();
     var tx, prev, prevHash, sig, err;
 
-    tx = MTX()
+    tx = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 10000);
 
@@ -241,11 +240,11 @@ describe('Mempool', function() {
   it('should not cache a malleated wtx with mutated sig', cob(function* () {
     var w = wallet;
     var kp = KeyRing.generate();
-    var tx, prev, prevHash, prevs, sig, tx, err;
+    var tx, prev, prevHash, prevs, sig, err;
 
     kp.witness = true;
 
-    tx = MTX()
+    tx = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 10000);
 
@@ -258,6 +257,7 @@ describe('Mempool', function() {
 
     sig = tx.signature(0, prevs, 70000, kp.privateKey, 'all', 1);
     sig[sig.length - 1] = 0;
+
     tx.inputs[0].witness = new Witness([sig, kp.publicKey]);
     tx = tx.toTX();
 
@@ -274,9 +274,9 @@ describe('Mempool', function() {
   it('should not cache a malleated tx with unnecessary witness', cob(function* () {
     var w = wallet;
     var kp = KeyRing.generate();
-    var tx, prev, prevHash, sig, tx, err;
+    var tx, prev, prevHash, sig, err;
 
-    tx = MTX()
+    tx = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 10000);
 
@@ -303,11 +303,11 @@ describe('Mempool', function() {
   it('should not cache a malleated wtx with wit removed', cob(function* () {
     var w = wallet;
     var kp = KeyRing.generate();
-    var tx, prev, prevHash, tx, err;
+    var tx, prev, prevHash, err;
 
     kp.witness = true;
 
-    tx = MTX()
+    tx = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 10000);
 
@@ -332,9 +332,9 @@ describe('Mempool', function() {
   it('should cache non-malleated tx without sig', cob(function* () {
     var w = wallet;
     var kp = KeyRing.generate();
-    var tx, prev, prevHash, tx, err;
+    var tx, prev, prevHash, err;
 
-    tx = MTX()
+    tx = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 10000);
 
@@ -359,10 +359,9 @@ describe('Mempool', function() {
 
   it('should clear reject cache', cob(function* () {
     var w = wallet;
-    var tx, input, tx, block;
+    var tx, input, block;
 
-    tx = MTX()
-      .addOutput(w.getAddress(), 50000);
+    tx = new MTX().addOutput(w.getAddress(), 50000);
 
     input = {
       prevout: {
diff --git a/test/mnemonic-test.js b/test/mnemonic-test.js
index 4a63b43c..734c1f77 100644
--- a/test/mnemonic-test.js
+++ b/test/mnemonic-test.js
@@ -1,8 +1,6 @@
 'use strict';
 
 var assert = require('assert');
-var util = require('../lib/utils/util');
-var crypto = require('../lib/crypto/crypto');
 var HD = require('../lib/hd');
 
 var mnemonic1 = require('./data/mnemonic1').english;
diff --git a/test/protocol-test.js b/test/protocol-test.js
index 29dea34a..428cc606 100644
--- a/test/protocol-test.js
+++ b/test/protocol-test.js
@@ -6,7 +6,6 @@ var constants = require('../lib/protocol/constants');
 var Network = require('../lib/protocol/network');
 var util = require('../lib/utils/util');
 var BufferReader = require('../lib/utils/reader');
-var crypto = require('../lib/crypto/crypto');
 var NetworkAddress = require('../lib/primitives/netaddress');
 var TX = require('../lib/primitives/tx');
 var Framer = require('../lib/net/framer');
diff --git a/test/script-test.js b/test/script-test.js
index a91c3a92..fb47eee2 100644
--- a/test/script-test.js
+++ b/test/script-test.js
@@ -5,8 +5,6 @@ var Script = require('../lib/script/script');
 var Witness = require('../lib/script/witness');
 var Stack = require('../lib/script/stack');
 var TX = require('../lib/primitives/tx');
-var util = require('../lib/utils/util');
-var crypto = require('../lib/crypto/crypto');
 var constants = require('../lib/protocol/constants');
 var opcodes = constants.opcodes;
 
@@ -239,7 +237,7 @@ describe('Script', function() {
     var comments = Array.isArray(data[4]) ? data[4].join('. ') : data[4] || '';
     var amount = 0;
     var flag = 0;
-    var i, name, err, res;
+    var i, name;
 
     if (data.length === 1)
       return;
diff --git a/test/tx-test.js b/test/tx-test.js
index 7b003be5..2a795046 100644
--- a/test/tx-test.js
+++ b/test/tx-test.js
@@ -170,7 +170,6 @@ describe('TX', function() {
       clearCache(p, noCache);
 
       assert(tx.verify(view));
-      util.log(tx.format(view));
     });
 
     it('should verify non-minimal output' + suffix, function() {
diff --git a/test/utils-test.js b/test/utils-test.js
index a6ac82a5..b5b5d940 100644
--- a/test/utils-test.js
+++ b/test/utils-test.js
@@ -2,7 +2,6 @@
 
 var assert = require('assert');
 var BN = require('bn.js');
-var util = require('../lib/utils/util');
 var ec = require('../lib/crypto/ec');
 var btcutils = require('../lib/btc/utils');
 var base58 = require('../lib/utils/base58');
@@ -30,12 +29,12 @@ describe('Utils', function() {
   ];
 
   it('should encode/decode base58', function() {
-    var arr = new Buffer([ 0, 0, 0, 0xde, 0xad, 0xbe, 0xef ]);
-    var b = base58.encode(arr);
-    var i, r, b;
+    var buf = new Buffer('000000deadbeef', 'hex');
+    var b = base58.encode(buf);
+    var i, r;
 
     assert.equal(b, '1116h8cQN');
-    assert.deepEqual(base58.decode(b), arr);
+    assert.deepEqual(base58.decode(b), buf);
 
     for (i = 0; i < vectors.length; i++) {
       r = new Buffer(vectors[i][0], 'hex');
@@ -257,12 +256,12 @@ describe('Utils', function() {
 
   it('should do proper hkdf', function() {
     // https://tools.ietf.org/html/rfc5869
-    var hash = 'sha256';
+    var alg = 'sha256';
     var ikm = '0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b';
     var salt = '000102030405060708090a0b0c';
     var info = 'f0f1f2f3f4f5f6f7f8f9';
     var len = 42;
-    var prkE, okmE, prk, okm, hash;
+    var prkE, okmE, prk, okm;
 
     prkE = '077709362c2e32df0ddc3f0dc47bba6390b6c73bb50f9c3122ec844ad7c2b3e5';
     okmE = '3cb25f25faacd57a90434f64d0362f2a2d2d0a90cf1'
@@ -272,13 +271,13 @@ describe('Utils', function() {
     salt = new Buffer(salt, 'hex');
     info = new Buffer(info, 'hex');
 
-    prk = crypto.hkdfExtract(ikm, salt, 'sha256');
-    okm = crypto.hkdfExpand(prk, info, len, 'sha256');
+    prk = crypto.hkdfExtract(ikm, salt, alg);
+    okm = crypto.hkdfExpand(prk, info, len, alg);
 
     assert.equal(prk.toString('hex'), prkE);
     assert.equal(okm.toString('hex'), okmE);
 
-    hash = 'sha256';
+    alg = 'sha256';
 
     ikm = '000102030405060708090a0b0c0d0e0f'
       + '101112131415161718191a1b1c1d1e1f'
@@ -314,8 +313,8 @@ describe('Utils', function() {
     salt = new Buffer(salt, 'hex');
     info = new Buffer(info, 'hex');
 
-    prk = crypto.hkdfExtract(ikm, salt, 'sha256');
-    okm = crypto.hkdfExpand(prk, info, len, 'sha256');
+    prk = crypto.hkdfExtract(ikm, salt, alg);
+    okm = crypto.hkdfExpand(prk, info, len, alg);
 
     assert.equal(prk.toString('hex'), prkE);
     assert.equal(okm.toString('hex'), okmE);
diff --git a/test/wallet-test.js b/test/wallet-test.js
index 9a539baf..399bd6ac 100644
--- a/test/wallet-test.js
+++ b/test/wallet-test.js
@@ -124,7 +124,7 @@ describe('Wallet', function() {
     else
       assert.equal(addr.type, scriptTypes.PUBKEYHASH);
 
-    src = MTX({
+    src = new MTX({
       outputs: [{
         value: 5460 * 2,
         address: bullshitNesting
@@ -138,7 +138,7 @@ describe('Wallet', function() {
 
     src.addInput(dummy());
 
-    tx = MTX()
+    tx = new MTX()
       .addInput(src, 0)
       .addOutput(w.getAddress(), 5460);
 
@@ -178,7 +178,7 @@ describe('Wallet', function() {
     ];
 
     // Input transaction (bare 1-of-2 multisig)
-    src = MTX({
+    src = new MTX({
       outputs: [{
         value: 5460 * 2,
         script: Script.fromMultisig(1, 2, keys)
@@ -190,7 +190,7 @@ describe('Wallet', function() {
 
     src.addInput(dummy());
 
-    tx = MTX()
+    tx = new MTX()
       .addInput(src, 0)
       .addOutput(w.getAddress(), 5460);
 
@@ -210,7 +210,7 @@ describe('Wallet', function() {
     doubleSpendWallet = w;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 1000);
     t1.addInput(dummy());
@@ -220,7 +220,7 @@ describe('Wallet', function() {
     // yield w.sign(t1);
     t1 = t1.toTX();
 
-    t2 = MTX()
+    t2 = new MTX()
       .addInput(t1, 0) // 50000
       .addOutput(w.getAddress(), 24000)
       .addOutput(w.getAddress(), 24000);
@@ -230,7 +230,7 @@ describe('Wallet', function() {
     // balance: 49000
     yield w.sign(t2);
     t2 = t2.toTX();
-    t3 = MTX()
+    t3 = new MTX()
       .addInput(t1, 1) // 1000
       .addInput(t2, 0) // 24000
       .addOutput(w.getAddress(), 23000);
@@ -238,7 +238,7 @@ describe('Wallet', function() {
     // balance: 47000
     yield w.sign(t3);
     t3 = t3.toTX();
-    t4 = MTX()
+    t4 = new MTX()
       .addInput(t2, 1) // 24000
       .addInput(t3, 0) // 23000
       .addOutput(w.getAddress(), 11000)
@@ -247,7 +247,7 @@ describe('Wallet', function() {
     // balance: 22000
     yield w.sign(t4);
     t4 = t4.toTX();
-    f1 = MTX()
+    f1 = new MTX()
       .addInput(t4, 1) // 11000
       .addOutput(f.getAddress(), 10000);
 
@@ -255,7 +255,7 @@ describe('Wallet', function() {
     yield w.sign(f1);
     f1 = f1.toTX();
 
-    fake = MTX()
+    fake = new MTX()
       .addInput(t1, 1) // 1000 (already redeemed)
       .addOutput(w.getAddress(), 500);
 
@@ -316,7 +316,7 @@ describe('Wallet', function() {
     var w = doubleSpendWallet;
     var tx, txs, total, balance;
 
-    tx = MTX().addOutput(w.getAddress(), 5000);
+    tx = new MTX().addOutput(w.getAddress(), 5000);
     tx.addInput(doubleSpend);
 
     txs = yield w.getHistory();
@@ -348,7 +348,7 @@ describe('Wallet', function() {
   }));
 
   it('should handle missed txs without resolution', cob(function* () {
-    var walletdb, w, f, t1, t2, t3, t4, f1, fake, balance, txs;
+    var walletdb, w, f, t1, t2, t3, t4, f1, balance, txs;
 
     walletdb = new WalletDB({
       name: 'wallet-test',
@@ -363,7 +363,7 @@ describe('Wallet', function() {
     f = yield walletdb.create();
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w.getAddress(), 50000)
       .addOutput(w.getAddress(), 1000);
     t1.addInput(dummy());
@@ -372,7 +372,7 @@ describe('Wallet', function() {
     // yield w.sign(t1);
     t1 = t1.toTX();
 
-    t2 = MTX()
+    t2 = new MTX()
       .addInput(t1, 0) // 50000
       .addOutput(w.getAddress(), 24000)
       .addOutput(w.getAddress(), 24000);
@@ -380,7 +380,7 @@ describe('Wallet', function() {
     // balance: 49000
     yield w.sign(t2);
     t2 = t2.toTX();
-    t3 = MTX()
+    t3 = new MTX()
       .addInput(t1, 1) // 1000
       .addInput(t2, 0) // 24000
       .addOutput(w.getAddress(), 23000);
@@ -388,7 +388,7 @@ describe('Wallet', function() {
     // balance: 47000
     yield w.sign(t3);
     t3 = t3.toTX();
-    t4 = MTX()
+    t4 = new MTX()
       .addInput(t2, 1) // 24000
       .addInput(t3, 0) // 23000
       .addOutput(w.getAddress(), 11000)
@@ -397,7 +397,7 @@ describe('Wallet', function() {
     // balance: 22000
     yield w.sign(t4);
     t4 = t4.toTX();
-    f1 = MTX()
+    f1 = new MTX()
       .addInput(t4, 1) // 11000
       .addOutput(f.getAddress(), 10000);
 
@@ -405,7 +405,7 @@ describe('Wallet', function() {
     yield w.sign(f1);
     f1 = f1.toTX();
 
-    // fake = MTX()
+    // fake = new MTX()
     //   .addInput(t1, 1) // 1000 (already redeemed)
     //   .addOutput(w.getAddress(), 500);
 
@@ -482,7 +482,7 @@ describe('Wallet', function() {
     var view, t1, t2, t3, err;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
@@ -494,7 +494,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t1);
 
     // Create new transaction
-    t2 = MTX().addOutput(w2.getAddress(), 5460);
+    t2 = new MTX().addOutput(w2.getAddress(), 5460);
     yield w1.fund(t2, { rate: 10000, round: true });
     yield w1.sign(t2);
     view = t2.view;
@@ -511,7 +511,7 @@ describe('Wallet', function() {
     assert.equal(t2.getFee(view), 10000); // minrelay=1000
 
     // Create new transaction
-    t3 = MTX().addOutput(w2.getAddress(), 15000);
+    t3 = new MTX().addOutput(w2.getAddress(), 15000);
 
     try {
       yield w1.fund(t3, { rate: 10000, round: true });
@@ -529,7 +529,7 @@ describe('Wallet', function() {
     var view, t1, t2, t3, balance, err;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
@@ -541,7 +541,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t1);
 
     // Create new transaction
-    t2 = MTX().addOutput(w2.getAddress(), 5460);
+    t2 = new MTX().addOutput(w2.getAddress(), 5460);
     yield w1.fund(t2, { rate: 10000 });
 
     yield w1.sign(t2);
@@ -568,7 +568,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t2);
 
     // Create new transaction
-    t3 = MTX().addOutput(w2.getAddress(), 15000);
+    t3 = new MTX().addOutput(w2.getAddress(), 15000);
 
     try {
       yield w1.fund(t3, { rate: 10000 });
@@ -588,7 +588,7 @@ describe('Wallet', function() {
     var t1, t2, tx, cost, total, coins1, coins2, left;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
@@ -598,7 +598,7 @@ describe('Wallet', function() {
     t1 = t1.toTX();
 
     // Coinbase
-    t2 = MTX()
+    t2 = new MTX()
       .addOutput(w2.getAddress(), 5460)
       .addOutput(w2.getAddress(), 5460)
       .addOutput(w2.getAddress(), 5460)
@@ -611,7 +611,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t2);
 
     // Create our tx with an output
-    tx = MTX();
+    tx = new MTX();
     tx.addOutput(to.getAddress(), 5460);
 
     cost = tx.getOutputValue();
@@ -718,7 +718,7 @@ describe('Wallet', function() {
     assert.equal(w3.getNested('base58'), paddr);
 
     // Add a shared unspent transaction to our wallets
-    utx = MTX();
+    utx = new MTX();
     if (bullshitNesting)
       utx.addOutput({ address: paddr, value: 5460 * 10 });
     else
@@ -749,7 +749,7 @@ describe('Wallet', function() {
     assert.equal(w3.account[rec].getAddress('base58'), b58);
 
     // Create a tx requiring 2 signatures
-    send = MTX();
+    send = new MTX();
     send.addOutput({ address: receive.getAddress(), value: 5460 });
     assert(!send.verify(flags));
     yield w1.fund(send, { rate: 10000, round: true });
@@ -772,7 +772,7 @@ describe('Wallet', function() {
     assert.equal(w3.account.change.getAddress('base58'), change);
 
     // Simulate a confirmation
-    var block = nextBlock();
+    block = nextBlock();
     send.height = block.height;
     send.block = block.hash;
     send.ts = block.ts;
@@ -828,7 +828,7 @@ describe('Wallet', function() {
     rec = account.receive;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(rec.getAddress(), 5460)
       .addOutput(rec.getAddress(), 5460)
       .addOutput(rec.getAddress(), 5460)
@@ -840,7 +840,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t1);
 
     // Create new transaction
-    t2 = MTX().addOutput(w2.getAddress(), 5460);
+    t2 = new MTX().addOutput(w2.getAddress(), 5460);
     yield w1.fund(t2, { rate: 10000, round: true });
     yield w1.sign(t2);
 
@@ -855,7 +855,7 @@ describe('Wallet', function() {
     assert.equal(t2.getFee(), 10000); // minrelay=1000
 
     // Create new transaction
-    t3 = MTX().addOutput(w2.getAddress(), 15000);
+    t3 = new MTX().addOutput(w2.getAddress(), 15000);
 
     try {
       yield w1.fund(t3, { rate: 10000, round: true });
@@ -894,7 +894,7 @@ describe('Wallet', function() {
       w.account.receive.getAddress('base58'));
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w.getAddress(), 5460)
       .addOutput(w.getAddress(), 5460)
       .addOutput(w.getAddress(), 5460)
@@ -906,7 +906,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t1);
 
     // Should fill from `foo` and fail
-    t2 = MTX().addOutput(w.getAddress(), 5460);
+    t2 = new MTX().addOutput(w.getAddress(), 5460);
     try {
       yield w.fund(t2, { rate: 10000, round: true, account: 'foo' });
     } catch (e) {
@@ -915,11 +915,11 @@ describe('Wallet', function() {
     assert(err);
 
     // Should fill from whole wallet and succeed
-    t2 = MTX().addOutput(w.getAddress(), 5460);
+    t2 = new MTX().addOutput(w.getAddress(), 5460);
     yield w.fund(t2, { rate: 10000, round: true });
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(account.receive.getAddress(), 5460)
       .addOutput(account.receive.getAddress(), 5460)
       .addOutput(account.receive.getAddress(), 5460);
@@ -930,17 +930,22 @@ describe('Wallet', function() {
 
     yield walletdb.addTX(t1);
 
-    t2 = MTX().addOutput(w.getAddress(), 5460);
+    t2 = new MTX().addOutput(w.getAddress(), 5460);
     // Should fill from `foo` and succeed
     yield w.fund(t2, { rate: 10000, round: true, account: 'foo' });
   }));
 
-  it('should create two accounts multiple encryption', cob(function* () {
+  it('should create two accounts (multiple encryption)', cob(function* () {
     var w = yield walletdb.create({ id: 'foobar', passphrase: 'foo' });
+    var account;
+
     yield w.destroy();
-    var w = yield walletdb.get('foobar');
-    var account = yield w.createAccount({ name: 'foo1' }, 'foo');
+
+    w = yield walletdb.get('foobar');
+
+    account = yield w.createAccount({ name: 'foo1' }, 'foo');
     assert(account);
+
     yield w.lock();
   }));
 
@@ -952,7 +957,7 @@ describe('Wallet', function() {
     w.master.key = null;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w.getAddress(), 5460)
       .addOutput(w.getAddress(), 5460)
       .addOutput(w.getAddress(), 5460)
@@ -964,7 +969,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t1);
 
     // Create new transaction
-    t2 = MTX().addOutput(w.getAddress(), 5460);
+    t2 = new MTX().addOutput(w.getAddress(), 5460);
     yield w.fund(t2, { rate: 10000, round: true });
 
     // Should fail
@@ -988,7 +993,7 @@ describe('Wallet', function() {
     var t1, t2;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
@@ -1000,7 +1005,7 @@ describe('Wallet', function() {
     yield walletdb.addTX(t1);
 
     // Create new transaction
-    t2 = MTX().addOutput(w2.getAddress(), 21840);
+    t2 = new MTX().addOutput(w2.getAddress(), 21840);
     yield w1.fund(t2, { rate: 10000, round: true, subtractFee: true });
     yield w1.sign(t2);
 
@@ -1017,7 +1022,7 @@ describe('Wallet', function() {
     var options, t1, t2;
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
       .addOutput(w1.getAddress(), 5460)
@@ -1090,7 +1095,7 @@ describe('Wallet', function() {
     assert.equal(k.getHash('hex'), key.getHash('hex'));
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(key.getAddress(), 5460)
       .addOutput(key.getAddress(), 5460)
       .addOutput(key.getAddress(), 5460)
@@ -1125,7 +1130,7 @@ describe('Wallet', function() {
     var priv = KeyRing.generate();
     var key = new KeyRing(priv.publicKey);
     var w = yield walletdb.create({ watchOnly: true });
-    var options, k, t1, t2, tx;
+    var k;
 
     yield w.importKey('default', key);
 
@@ -1140,7 +1145,7 @@ describe('Wallet', function() {
   it('should import address', cob(function* () {
     var key = KeyRing.generate();
     var w = yield walletdb.create({ watchOnly: true });
-    var options, k, t1, t2, tx;
+    var k;
 
     yield w.importAddress('default', key.getAddress());
 
@@ -1223,7 +1228,7 @@ describe('Wallet', function() {
     addr = alice.getAddress();
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(addr, 50000);
     t1.addInput(dummy());
 
@@ -1234,7 +1239,7 @@ describe('Wallet', function() {
     yield bob.add(t1);
 
     // Bob misses this tx!
-    t2 = MTX()
+    t2 = new MTX()
       .addInput(t1, 0)
       .addOutput(addr, 24000)
       .addOutput(addr, 24000);
@@ -1249,7 +1254,7 @@ describe('Wallet', function() {
       (yield bob.getBalance()).unconfirmed);
 
     // Bob sees this one.
-    t3 = MTX()
+    t3 = new MTX()
       .addInput(t2, 0)
       .addInput(t2, 1)
       .addOutput(addr, 30000);
@@ -1290,7 +1295,7 @@ describe('Wallet', function() {
     addr = alice.getAddress();
 
     // Coinbase
-    t1 = MTX()
+    t1 = new MTX()
       .addOutput(addr, 50000);
     t1.addInput(dummy());
 
@@ -1301,7 +1306,7 @@ describe('Wallet', function() {
     yield bob.add(t1);
 
     // Bob misses this tx!
-    t2 = MTX()
+    t2 = new MTX()
       .addInput(t1, 0)
       .addOutput(addr, 24000)
       .addOutput(addr, 24000);
@@ -1316,7 +1321,7 @@ describe('Wallet', function() {
       (yield bob.getBalance()).unconfirmed);
 
     // Bob doublespends.
-    t2a = MTX()
+    t2a = new MTX()
       .addInput(t1, 0)
       .addOutput(addr, 10000)
       .addOutput(addr, 10000);
@@ -1327,7 +1332,7 @@ describe('Wallet', function() {
     yield bob.add(t2a);
 
     // Bob sees this one.
-    t3 = MTX()
+    t3 = new MTX()
       .addInput(t2, 0)
       .addInput(t2, 1)
       .addOutput(addr, 30000);
@@ -1351,8 +1356,7 @@ describe('Wallet', function() {
     assert.equal((yield bob.getBalance()).unconfirmed, 30000);
   }));
 
-  it('should cleanup', cob(function* () {
-    var records = yield walletdb.dump();
+  it('should cleanup', function() {
     constants.tx.COINBASE_MATURITY = 100;
-  }));
+  });
 });