diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index 3c3ba1c8..40f4942a 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -25,8 +25,6 @@ function Block(data) {
 
   this.type = 'block';
 
-  this._witness = data._witness || false;
-  this._cost = data._cost || 0;
   this._witnessSize = data._witnessSize || 0;
 
   this.txs = data.txs || [];
@@ -45,7 +43,7 @@ utils.inherits(Block, bcoin.abstractblock);
 
 Block.prototype.render = function render() {
   if (this._raw) {
-    if (!this._witness)
+    if (!this._witnessSize)
       return this._raw;
     return bcoin.protocol.framer.block(this);
   }
@@ -55,14 +53,14 @@ Block.prototype.render = function render() {
 
   this._raw = bcoin.protocol.framer.block(this);
   this._size = this._raw.length;
-  this._witness = false;
+  this._witnessSize = 0;
 
   return this._raw;
 };
 
 Block.prototype.renderWitness = function renderWitness() {
   if (this._raw) {
-    if (this._witness)
+    if (this._witnessSize)
       return this._raw;
     return bcoin.protocol.framer.witnessBlock(this);
   }
@@ -72,7 +70,7 @@ Block.prototype.renderWitness = function renderWitness() {
 
   this._raw = bcoin.protocol.framer.witnessBlock(this);
   this._size = this._raw.length;
-  this._witness = true;
+  this._witnessSize = this._raw._witnessSize;
 
   return this._raw;
 };
@@ -97,12 +95,6 @@ Block.prototype.getSize = function getSize() {
   return size;
 };
 
-Block.prototype.getCost = function getCost() {
-  if (!this._cost)
-    this._cost = this._renderWitness()._cost;
-  return this._cost;
-};
-
 Block.prototype.hasWitness = function hasWitness() {
   for (var i = 0; i < this.txs.length; i++) {
     if (this.txs[i].hasWitness())
@@ -111,12 +103,12 @@ Block.prototype.hasWitness = function hasWitness() {
   return false;
 };
 
-Block.prototype.getSigopsCost = function getSigopCost(scriptHash) {
+Block.prototype.getSigopsCost = function getSigopCost(scriptHash, accurate) {
   var cost = 0;
   var i;
 
   for (i = 0; i < this.txs.length; i++)
-    cost += this.txs[i].getSigopsCost(scriptHash);
+    cost += this.txs[i].getSigopsCost(scriptHash, accurate);
 
   return cost;
 };
diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index 603b73e6..413228e9 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -40,7 +40,6 @@ function MTX(options) {
   this._raw = null;
   this._size = 0;
   this._offset = 0;
-  this._cost = 0;
   this._witnessSize = 0;
 
   this.height = -1;
@@ -101,10 +100,6 @@ MTX.prototype.getSize = function getSize() {
   return this.render().length;
 };
 
-MTX.prototype.getCost = function getCost() {
-  return this.renderWitness()._cost;
-};
-
 MTX.prototype.addInput = function addInput(options, index) {
   var input, i;
 
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index 3e3ac611..f39d650f 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -473,7 +473,6 @@ Framer.tx = function _tx(tx) {
 
   off += utils.writeU32(p, tx.locktime, off);
 
-  p._cost = p.length * 4;
   p._witnessSize = 0;
 
   return p;
@@ -530,17 +529,13 @@ Framer.witnessTX = function _witnessTX(tx) {
     off += utils.copy(output, p, off);
   }
 
-  p._cost = (off - 2) * 4;
-
   // NOTE: No varint item count here.
   for (i = 0; i < witnesses.length; i++)
     off += utils.copy(witnesses[i], p, off);
 
   off += utils.writeU32(p, tx.locktime, off);
-  p._cost += 4 * 4;
 
-  p._cost += witnessSize;
-  p._witnessSize = witnessSize;
+  p._witnessSize = witnessSize + 2;
 
   return p;
 };
@@ -584,7 +579,6 @@ Framer.witnessBlock = function _witnessBlock(block) {
 Framer._block = function _block(block, witness) {
   var off = 0;
   var txSize = 0;
-  var cost = 0;
   var witnessSize = 0;
   var txs = [];
   var hasWitness;
@@ -601,7 +595,6 @@ Framer._block = function _block(block, witness) {
       : Framer.tx(block.txs[i]);
     txs.push(tx);
     txSize += tx.length;
-    cost += tx._cost;
     witnessSize += tx._witnessSize;
   }
 
@@ -630,13 +623,10 @@ Framer._block = function _block(block, witness) {
   // txn_count
   off += utils.writeIntv(p, block.txs.length, off);
 
-  cost += off * 4;
-
   // txs
   for (i = 0; i < txs.length; i++)
     off += utils.copy(txs[i], p, off);
 
-  p._cost = cost;
   p._witnessSize = witnessSize;
 
   return p;
diff --git a/lib/bcoin/protocol/parser.js b/lib/bcoin/protocol/parser.js
index e4042ec5..7979384f 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -331,10 +331,8 @@ Parser.parseHeaders = function parseHeaders(p) {
 
 Parser.parseBlock = function parseBlock(p) {
   var txs = [];
-  var cost = 0;
   var witnessSize = 0;
   var i, result, off, totalTX, tx;
-  var witness;
 
   if (p.length < 81)
     throw new Error('Invalid block size');
@@ -343,17 +341,12 @@ Parser.parseBlock = function parseBlock(p) {
   off = result.off;
   totalTX = result.r;
 
-  cost += off * 4;
-
   for (i = 0; i < totalTX; i++) {
     tx = Parser.parseTX(p.slice(off));
     if (!tx)
       throw new Error('Invalid tx count for block');
-    if (tx.witness)
-      witness = true;
     tx._offset = off;
     off += tx._size;
-    cost += tx._cost;
     witnessSize += tx._witnessSize;
     txs.push(tx);
   }
@@ -367,10 +360,8 @@ Parser.parseBlock = function parseBlock(p) {
     nonce: utils.readU32(p, 76),
     totalTX: totalTX,
     txs: txs,
-    _witness: witness,
     _raw: p,
     _size: p.length,
-    _cost: cost,
     _witnessSize: witnessSize
   };
 };
@@ -556,6 +547,7 @@ Parser.parseTX = function parseTX(p) {
       return;
 
     txIn[i] = tx;
+    txIn[i].witness = [];
     tx._offset = off;
     off += tx._size;
 
@@ -594,8 +586,6 @@ Parser.parseTX = function parseTX(p) {
     inputs: txIn,
     outputs: txOut,
     locktime: locktime,
-    _witness: false,
-    _cost: off * 4,
     _witnessSize: 0,
     _raw: p.length !== off ? p.slice(0, off) : p,
     _size: off
@@ -610,7 +600,6 @@ Parser.isWitnessTX = function isWitnessTX(p) {
 };
 
 Parser.parseWitnessTX = function parseWitnessTX(p) {
-  var cost = 0;
   var off = 0;
   var inCount, txIn, tx;
   var outCount, txOut;
@@ -682,8 +671,6 @@ Parser.parseWitnessTX = function parseWitnessTX(p) {
       throw new Error('Invalid tx_out offset');
   }
 
-  cost += (off - 2) * 4;
-
   for (i = 0; i < inCount; i++) {
     tx = Parser.parseWitness(p.slice(off));
 
@@ -694,7 +681,6 @@ Parser.parseWitnessTX = function parseWitnessTX(p) {
     txIn[i]._witnessSize = tx._size;
     txIn[i]._witnessOffset = off;
     off += tx._size;
-    cost += tx._size;
     witnessSize += tx._size;
 
     if (off + 4 > p.length)
@@ -703,7 +689,6 @@ Parser.parseWitnessTX = function parseWitnessTX(p) {
 
   locktime = utils.readU32(p, off);
   off += 4;
-  cost += 4 * 4;
 
   return {
     version: version,
@@ -712,11 +697,9 @@ Parser.parseWitnessTX = function parseWitnessTX(p) {
     inputs: txIn,
     outputs: txOut,
     locktime: locktime,
-    _witness: true,
     _raw: off !== p.length ? p.slice(0, off) : p,
     _size: off,
-    _cost: cost,
-    _witnessSize: witnessSize
+    _witnessSize: witnessSize + 2
   };
 };
 
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index d5e1d405..daff267c 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -37,8 +37,6 @@ function TX(data, block, index) {
   this._raw = data._raw || null;
   this._size = data._size || 0;
   this._offset = data._offset || 0;
-  this._cost = data._cost || 0;
-  this._witness = data._witness || false;
   this._witnessSize = data._witnessSize || 0;
 
   this.height = data.height != null ? data.height : -1;
@@ -92,11 +90,10 @@ TX.prototype.clone = function clone() {
   //   return output;
   // });
 
-  delete tx._witness;
+  delete tx._witnessSize;
   delete tx._raw;
   delete tx._size;
   delete tx._offset;
-  delete tx._cost;
   delete tx._hash;
   delete tx._whash;
 
@@ -145,7 +142,7 @@ TX.prototype.hasWitness = function hasWitness() {
 
 TX.prototype.render = function render() {
   if (this._raw) {
-    if (!this._witness)
+    if (!this._witnessSize)
       return this._raw;
     return bcoin.protocol.framer.tx(this);
   }
@@ -155,14 +152,14 @@ TX.prototype.render = function render() {
 
   this._raw = bcoin.protocol.framer.tx(this);
   this._size = this._raw.length;
-  this._witness = false;
+  this._witnessSize = 0;
 
   return this._raw;
 };
 
 TX.prototype.renderWitness = function renderWitness() {
   if (this._raw) {
-    if (this._witness)
+    if (this._witnessSize)
       return this._raw;
     // We probably shouldn't even render it
     // as a witness tx if it doesn't have a witness.
@@ -176,7 +173,7 @@ TX.prototype.renderWitness = function renderWitness() {
 
   this._raw = bcoin.protocol.framer.witnessTX(this);
   this._size = this._raw.length;
-  this._witness = true;
+  this._witnessSize = this._raw._witnessSize;
 
   return this._raw;
 };
@@ -185,12 +182,6 @@ TX.prototype.getSize = function getSize() {
   return this.render().length;
 };
 
-TX.prototype.getCost = function getCost() {
-  if (!this._cost)
-    this._cost = this.renderWitness()._cost;
-  return this._cost;
-};
-
 TX.prototype._inputIndex = function _inputIndex(hash, index) {
   var i, ex;
 
@@ -695,7 +686,7 @@ TX.prototype.getSigopsCost = function getSigopsCost(scriptHash, accurate) {
       cost += 0;
   }, this);
 
-  return cost;
+  return (cost + 3) / 4 | 0;
 };
 
 TX.prototype.isStandard = function isStandard(flags) {
@@ -965,7 +956,7 @@ TX.prototype.inspect = function inspect() {
     type: this.type,
     hash: utils.revHex(this.hash('hex')),
     witnessHash: utils.revHex(this.witnessHash('hex')),
-    witness: this._witness,
+    witness: this._witnessSize > 0,
     height: this.height,
     value: utils.btc(this.getValue()),
     fee: utils.btc(this.getFee()),