diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index 5888dc00..fe8ddce1 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -211,6 +211,17 @@ MTX.prototype.getSize = function getSize() {
   return bcoin.protocol.framer.tx.witnessSize(this);
 };
 
+/**
+ * Calculate the size of the transaction
+ * with the witness excluded. Note that this
+ * is _not_ cached.
+ * @returns {Number} size
+ */
+
+MTX.prototype.getBaseSize = function getBaseSize() {
+  return bcoin.protocol.framer.tx.size(this);
+};
+
 /**
  * Calculate the virtual size of the transaction.
  * Note that this is _not_ cached.
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 45115db6..d9ad5fea 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -322,6 +322,18 @@ TX.prototype.getSize = function getSize() {
   return this.getRaw().length;
 };
 
+/**
+ * Calculate the size of the transaction
+ * without the witness.
+ * with the witness included.
+ * @returns {Number} size
+ */
+
+TX.prototype.getBaseSize = function getBaseSize() {
+  this.getRaw();
+  return this._size - this._witnessSize;
+};
+
 /**
  * Test whether the transaction has a non-empty witness.
  * @returns {Boolean}
@@ -1088,7 +1100,7 @@ TX.prototype.isSane = function isSane(ret) {
     return false;
   }
 
-  if (this.getSize() > constants.block.MAX_SIZE) {
+  if (this.getBaseSize() > constants.block.MAX_SIZE) {
     ret.reason = 'bad-txns-oversize';
     ret.score = 100;
     return false;
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index bab004c9..c4470c73 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -14,7 +14,7 @@ var utils = exports;
 var assert = require('assert');
 var bn = require('bn.js');
 var util = require('util');
-var crypto, hash, aes;
+var crypto, supersha, hash, aes;
 
 /**
  * Whether we're in a browser or not.
@@ -27,6 +27,11 @@ utils.isBrowser =
 
 if (!utils.isBrowser) {
   crypto = require('cry' + 'pto');
+  try {
+    supersha = require('super' + 'sha');
+  } catch (e) {
+    ;
+  }
 } else {
   hash = require('hash.js');
   aes = require('./aes');
@@ -242,6 +247,11 @@ utils.sha1 = function sha1(data, enc) {
  */
 
 utils.sha256 = function sha256(data, enc) {
+  if (supersha) {
+    if (!Buffer.isBuffer(data))
+      data = new Buffer(data, enc);
+    return supersha.sha256(data);
+  }
   return utils.hash('sha256', data, enc);
 };
 
@@ -264,6 +274,11 @@ utils.ripesha = function ripesha(data, enc) {
  */
 
 utils.dsha256 = function dsha256(data, enc) {
+  if (supersha) {
+    if (!Buffer.isBuffer(data))
+      data = new Buffer(data, enc);
+    return supersha.dsha256(data);
+  }
   return utils.sha256(utils.sha256(data, enc));
 };