diff --git a/lib/btc/index.js b/lib/btc/index.js
index af9a8f98..91444338 100644
--- a/lib/btc/index.js
+++ b/lib/btc/index.js
@@ -1,6 +1,6 @@
 'use strict';
 
 exports.Amount = require('./amount');
-exports.btcutils = require('./btcutils');
+exports.utils = require('./utils');
 exports.errors = require('./errors');
 exports.uri = require('./uri');
diff --git a/lib/btc/btcutils.js b/lib/btc/utils.js
similarity index 88%
rename from lib/btc/btcutils.js
rename to lib/btc/utils.js
index 80b553fc..952882f8 100644
--- a/lib/btc/btcutils.js
+++ b/lib/btc/utils.js
@@ -1,5 +1,5 @@
 /*!
- * btcutils.js - bitcoin-related utils for bcoin
+ * utils.js - bitcoin-related utils for bcoin
  * Copyright (c) 2014-2015, Fedor Indutny (MIT License)
  * Copyright (c) 2014-2016, Christopher Jeffrey (MIT License).
  * https://github.com/bcoin-org/bcoin
@@ -12,7 +12,7 @@ var BN = require('bn.js');
 var constants = require('../protocol/constants');
 var util = require('../utils/util');
 var Amount = require('./amount');
-var btcutils = exports;
+var utils = exports;
 
 /**
  * Convert a compact number to a big number.
@@ -21,7 +21,7 @@ var btcutils = exports;
  * @returns {BN}
  */
 
-btcutils.fromCompact = function fromCompact(compact) {
+utils.fromCompact = function fromCompact(compact) {
   var exponent = compact >>> 24;
   var negative = (compact >>> 23) & 1;
   var mantissa = compact & 0x7fffff;
@@ -53,7 +53,7 @@ btcutils.fromCompact = function fromCompact(compact) {
  * @returns {Number}
  */
 
-btcutils.toCompact = function toCompact(num) {
+utils.toCompact = function toCompact(num) {
   var mantissa, exponent, compact;
 
   if (num.cmpn(0) === 0)
@@ -90,8 +90,8 @@ btcutils.toCompact = function toCompact(num) {
  * @returns {Boolean}
  */
 
-btcutils.verifyPOW = function verifyPOW(hash, bits) {
-  var target = btcutils.fromCompact(bits);
+utils.verifyPOW = function verifyPOW(hash, bits) {
+  var target = utils.fromCompact(bits);
 
   if (target.isNeg() || target.cmpn(0) === 0)
     return false;
@@ -110,8 +110,8 @@ btcutils.verifyPOW = function verifyPOW(hash, bits) {
  * @returns {Amount}
  */
 
-btcutils.getReward = function getReward(height, interval) {
-  var halvings = height / interval | 0;
+utils.getReward = function getReward(height, interval) {
+  var halvings = Math.floor(height / interval);
 
   assert(height >= 0, 'Bad height for reward.');
 
@@ -138,7 +138,7 @@ btcutils.getReward = function getReward(height, interval) {
  * @returns {Amount} fee
  */
 
-btcutils.getMinFee = function getMinFee(size, rate) {
+utils.getMinFee = function getMinFee(size, rate) {
   var fee;
 
   if (rate == null)
@@ -161,7 +161,7 @@ btcutils.getMinFee = function getMinFee(size, rate) {
  * @returns {Amount} fee
  */
 
-btcutils.getRoundFee = function getRoundFee(size, rate) {
+utils.getRoundFee = function getRoundFee(size, rate) {
   var fee;
 
   if (rate == null)
@@ -182,7 +182,7 @@ btcutils.getRoundFee = function getRoundFee(size, rate) {
  * @returns {Rate}
  */
 
-btcutils.getRate = function getRate(size, fee) {
+utils.getRate = function getRate(size, fee) {
   return Math.floor(fee * 1000 / size);
 };
 
@@ -194,7 +194,7 @@ btcutils.getRate = function getRate(size, fee) {
  * @returns {String} BTC string.
  */
 
-btcutils.btc = function btc(value) {
+utils.btc = function btc(value) {
   if (util.isFloat(value))
     return value;
   return Amount.fromValue(value).toBTC();
@@ -211,7 +211,7 @@ btcutils.btc = function btc(value) {
  * @throws on parse error
  */
 
-btcutils.satoshi = function satoshi(value) {
+utils.satoshi = function satoshi(value) {
   if (util.isInt(value))
     return value;
   return Amount.fromBTC(value).toValue();
@@ -223,7 +223,7 @@ btcutils.satoshi = function satoshi(value) {
  * @returns {Boolean}
  */
 
-btcutils.isSatoshi = function isSatoshi(value) {
+utils.isSatoshi = function isSatoshi(value) {
   try {
     Amount.fromValue(value);
     return true;
@@ -238,7 +238,7 @@ btcutils.isSatoshi = function isSatoshi(value) {
  * @returns {Boolean}
  */
 
-btcutils.isBTC = function isBTC(value) {
+utils.isBTC = function isBTC(value) {
   try {
     Amount.fromBTC(value);
     return true;
@@ -253,7 +253,7 @@ btcutils.isBTC = function isBTC(value) {
  * @returns {TX[]}
  */
 
-btcutils.sortTX = function sortTX(txs) {
+utils.sortTX = function sortTX(txs) {
   var depMap = {};
   var count = {};
   var result = [];
diff --git a/lib/chain/chain.js b/lib/chain/chain.js
index ebff9a6b..7dc13e1f 100644
--- a/lib/chain/chain.js
+++ b/lib/chain/chain.js
@@ -13,7 +13,7 @@ var Logger = require('../node/logger');
 var ChainDB = require('./chaindb');
 var constants = require('../protocol/constants');
 var util = require('../utils/util');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var Locker = require('../utils/locker');
 var ChainEntry = require('./chainentry');
 var CoinView = require('./coinview');
diff --git a/lib/chain/chainentry.js b/lib/chain/chainentry.js
index 0c22a8a4..289d6145 100644
--- a/lib/chain/chainentry.js
+++ b/lib/chain/chainentry.js
@@ -11,7 +11,7 @@ var BN = require('bn.js');
 var Network = require('../protocol/network');
 var constants = require('../protocol/constants');
 var util = require('../utils/util');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var crypto = require('../crypto/crypto');
 var assert = require('assert');
 var BufferWriter = require('../utils/writer');
diff --git a/lib/env.js b/lib/env.js
index 298a1925..29f11fee 100644
--- a/lib/env.js
+++ b/lib/env.js
@@ -113,16 +113,15 @@ function Environment() {
   this.require('bn', 'bn.js');
   this.require('elliptic', 'elliptic');
 
+  // Horrible BIP
+  this.require('bip70', './bip70');
+
   // BTC
   this.require('btc', './btc');
   this.require('amount', './btc/amount');
-  this.require('btcutils', './btc/btcutils');
   this.require('errors', './btc/errors');
   this.require('uri', './btc/uri');
 
-  // Horrible BIP
-  this.require('bip70', './bip70');
-
   // Chain
   this.require('blockchain', './chain'); // -> blockchain?
   this.require('chain', './chain/chain');
@@ -215,7 +214,7 @@ function Environment() {
   this.require('writer', './utils/writer');
 
   // Wallet
-  this.require('wallet', './wallet');
+  this.require('wallet', './wallet'); // -> ?
   this.require('account', './wallet/account');
   this.require('path', './wallet/path');
   this.require('masterkey', './wallet/masterkey');
diff --git a/lib/mempool/mempoolentry.js b/lib/mempool/mempoolentry.js
index 388a6d24..1ff4b84e 100644
--- a/lib/mempool/mempoolentry.js
+++ b/lib/mempool/mempoolentry.js
@@ -8,7 +8,7 @@
 
 var constants = require('../protocol/constants');
 var util = require('../utils/util');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 
 /**
  * Represents a mempool entry.
diff --git a/lib/mining/minerblock.js b/lib/mining/minerblock.js
index 4f66a7a6..9cfd9df6 100644
--- a/lib/mining/minerblock.js
+++ b/lib/mining/minerblock.js
@@ -9,7 +9,7 @@
 
 var assert = require('assert');
 var util = require('../utils/util');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var co = require('../utils/co');
 var crypto = require('../crypto/crypto');
 var constants = require('../protocol/constants');
diff --git a/lib/net/index.js b/lib/net/index.js
index 184793aa..f6ac874d 100644
--- a/lib/net/index.js
+++ b/lib/net/index.js
@@ -2,7 +2,7 @@
 
 exports.BIP150 = require('./bip150');
 exports.BIP151 = require('./bip151');
-exports.BIP152 = require('./bip152');
+exports.bip152 = require('./bip152');
 exports.packets = require('./packets');
 exports.Framer = require('./framer');
 exports.Parser = require('./parser');
diff --git a/lib/primitives/abstractblock.js b/lib/primitives/abstractblock.js
index b418ac8b..e7044890 100644
--- a/lib/primitives/abstractblock.js
+++ b/lib/primitives/abstractblock.js
@@ -11,7 +11,7 @@ var assert = require('assert');
 var constants = require('../protocol/constants');
 var util = require('../utils/util');
 var crypto = require('../crypto/crypto');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var VerifyResult = require('../btc/errors').VerifyResult;
 var BufferWriter = require('../utils/writer');
 var time = require('../net/time');
diff --git a/lib/primitives/block.js b/lib/primitives/block.js
index de9c7409..f35e75cb 100644
--- a/lib/primitives/block.js
+++ b/lib/primitives/block.js
@@ -10,7 +10,7 @@
 var assert = require('assert');
 var util = require('../utils/util');
 var crypto = require('../crypto/crypto');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var constants = require('../protocol/constants');
 var AbstractBlock = require('./abstractblock');
 var VerifyResult = require('../btc/errors').VerifyResult;
diff --git a/lib/primitives/mtx.js b/lib/primitives/mtx.js
index 6fe8139f..c6ad383e 100644
--- a/lib/primitives/mtx.js
+++ b/lib/primitives/mtx.js
@@ -9,7 +9,7 @@
 
 var assert = require('assert');
 var util = require('../utils/util');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var constants = require('../protocol/constants');
 var Script = require('../script/script');
 var opcodes = Script.opcodes;
diff --git a/lib/primitives/output.js b/lib/primitives/output.js
index 51124c8d..9255286b 100644
--- a/lib/primitives/output.js
+++ b/lib/primitives/output.js
@@ -9,6 +9,7 @@
 
 var util = require('../utils/util');
 var constants = require('../protocol/constants');
+var btcutils = require('../btc/utils');
 var Amount = require('../btc/amount');
 var Network = require('../protocol/network');
 var Script = require('../script/script');
@@ -154,7 +155,7 @@ Output.prototype.toJSON = function toJSON(network) {
 
 Output.prototype.getDustThreshold = function getDustThreshold(rate) {
   var scale = constants.WITNESS_SCALE_FACTOR;
-  var size, fee;
+  var size;
 
   if (rate == null)
     rate = constants.tx.MIN_RELAY;
@@ -171,12 +172,7 @@ Output.prototype.getDustThreshold = function getDustThreshold(rate) {
     size += 32 + 4 + 1 + 107 + 4;
   }
 
-  fee = Math.floor(rate * size / 1000);
-
-  if (fee === 0 && rate > 0)
-    fee = rate;
-
-  return 3 * fee;
+  return 3 * btcutils.getMinFee(size, rate);
 };
 
 /**
diff --git a/lib/primitives/tx.js b/lib/primitives/tx.js
index 16f2abb7..42294e38 100644
--- a/lib/primitives/tx.js
+++ b/lib/primitives/tx.js
@@ -10,7 +10,7 @@
 var assert = require('assert');
 var util = require('../utils/util');
 var crypto = require('../crypto/crypto');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var Amount = require('../btc/amount');
 var constants = require('../protocol/constants');
 var Network = require('../protocol/network');
diff --git a/lib/wallet/txdb.js b/lib/wallet/txdb.js
index 09fab03f..d9e74030 100644
--- a/lib/wallet/txdb.js
+++ b/lib/wallet/txdb.js
@@ -14,7 +14,7 @@ var assert = require('assert');
 var constants = require('../protocol/constants');
 var BufferReader = require('../utils/reader');
 var BufferWriter = require('../utils/writer');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var Amount = require('../btc/amount');
 var TX = require('../primitives/tx');
 var Coin = require('../primitives/coin');
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index d47e4ec8..984cd2c6 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -15,7 +15,7 @@ var util = require('../utils/util');
 var Locker = require('../utils/locker');
 var co = require('../utils/co');
 var crypto = require('../crypto/crypto');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var BufferReader = require('../utils/reader');
 var BufferWriter = require('../utils/writer');
 var base58 = require('../utils/base58');
diff --git a/lib/wallet/walletdb.js b/lib/wallet/walletdb.js
index c61ded3b..c076714d 100644
--- a/lib/wallet/walletdb.js
+++ b/lib/wallet/walletdb.js
@@ -15,7 +15,7 @@ var Locker = require('../utils/locker');
 var LRU = require('../utils/lru');
 var encoding = require('../utils/encoding');
 var crypto = require('../crypto/crypto');
-var btcutils = require('../btc/btcutils');
+var btcutils = require('../btc/utils');
 var constants = require('../protocol/constants');
 var Network = require('../protocol/network');
 var Path = require('./path');
diff --git a/test/block-test.js b/test/block-test.js
index 5bd3b41d..17f32374 100644
--- a/test/block-test.js
+++ b/test/block-test.js
@@ -3,7 +3,7 @@
 var BN = require('bn.js');
 var bcoin = require('../').set('main');
 var util = bcoin.util;
-var btcutils = require('../lib/btc/btcutils');
+var btcutils = require('../lib/btc/utils');
 var crypto = require('../lib/crypto/crypto');
 var Bloom = require('../lib/utils/bloom');
 var constants = bcoin.constants;
diff --git a/test/utils-test.js b/test/utils-test.js
index 4f748687..3b0c5f4c 100644
--- a/test/utils-test.js
+++ b/test/utils-test.js
@@ -4,7 +4,7 @@ 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/btcutils');
+var btcutils = require('../lib/btc/utils');
 var base58 = require('../lib/utils/base58');
 var encoding = require('../lib/utils/encoding');
 var crypto = require('../lib/crypto/crypto');