diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index 6edf09f9..3c3ba1c8 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -27,6 +27,7 @@ function Block(data) {
 
   this._witness = data._witness || false;
   this._cost = data._cost || 0;
+  this._witnessSize = data._witnessSize || 0;
 
   this.txs = data.txs || [];
 
@@ -77,7 +78,23 @@ Block.prototype.renderWitness = function renderWitness() {
 };
 
 Block.prototype.getSize = function getSize() {
-  return this.render().length;
+  var size = this._size;
+  var witnessSize = this._witnessSize;
+  var raw, base;
+
+  if (!size) {
+    raw = bcoin.protocol.framer.witnessBlock(this);
+    size = raw.length;
+    witnessSize = raw._witnessSize;
+  }
+
+  // Virtual size:
+  if (witnessSize > 0) {
+    base = size - witnessSize;
+    return (base * 4 + witnessSize + 3) / 4 | 0;
+  }
+
+  return size;
 };
 
 Block.prototype.getCost = function getCost() {
diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index b07fdb1a..6bdfa4e5 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -458,7 +458,7 @@ Chain.prototype._verify = function _verify(block, prev) {
   var locktimeMedian, segwit;
 
   if (!block.verify())
-    return flags;
+    return false;
 
   // Skip the genesis block
   if (block.isGenesis())
diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index 63321311..603b73e6 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -32,6 +32,8 @@ function MTX(options) {
   this.ts = 0;
   this.block = null;
   this.index = -1;
+  this.ps = this.ts === 0 ? utils.now() : 0;
+  this.changeIndex = options.changeIndex != null ? options.changeIndex : -1;
 
   this._hash = null;
   this._whash = null;
@@ -39,6 +41,7 @@ function MTX(options) {
   this._size = 0;
   this._offset = 0;
   this._cost = 0;
+  this._witnessSize = 0;
 
   this.height = -1;
 
@@ -55,9 +58,6 @@ function MTX(options) {
       this.addOutput(output);
     }, this);
   }
-
-  this.changeIndex = options.changeIndex != null ? options.changeIndex : -1;
-  this.ps = this.ts === 0 ? utils.now() : 0;
 }
 
 utils.inherits(MTX, bcoin.tx);
@@ -656,8 +656,10 @@ MTX.prototype.maxSize = function maxSize(maxM, maxN) {
   var i, j, input, total, size, prev, m, n;
 
   // Create copy with 0-script inputs
-  for (i = 0; i < copy.inputs.length; i++)
+  for (i = 0; i < copy.inputs.length; i++) {
     copy.inputs[i].script = [];
+    copy.inputs[i].witness = [];
+  }
 
   total = copy.render().length;
 
@@ -682,6 +684,15 @@ MTX.prototype.maxSize = function maxSize(maxM, maxN) {
       size += 3 + bcoin.script.getSize(prev);
     }
 
+    if (this.inputs[i].witness.length) {
+      if (bcoin.script.isWitnessScripthash(prev)) {
+        prev = bcoin.script.getRedeem(this.inputs[i].witness);
+        size += 3 + bcoin.script.getSize(prev);
+      } else if (bcoin.script.isWitnessPubkeyhash(prev)) {
+        prev = bcoin.script.createPubkeyhash(prev[1]);
+      }
+    }
+
     if (bcoin.script.isPubkey(prev)) {
       // P2PK
       // OP_PUSHDATA0 [signature]
@@ -1151,6 +1162,7 @@ MTX.fromRaw = function fromRaw(data, enc) {
 MTX.fromTX = function fromTX(tx) {
   var mtx = new bcoin.tx({
     ts: tx.ts,
+    ps: tx.ps,
     block: tx.block,
     height: tx.height,
     version: tx.version,
@@ -1164,13 +1176,13 @@ MTX.fromTX = function fromTX(tx) {
     }),
     locktime: tx.locktime
   });
-  mtx.ps = tx.ps;
   return mtx;
 };
 
 MTX.prototype.toTX = function toTX() {
   var tx = new bcoin.tx({
     ts: this.ts,
+    ps: this.ps,
     block: this.block,
     height: this.height,
     version: this.version,
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index 0535851d..a292ec9e 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -179,6 +179,10 @@ Pool.prototype._init = function _init() {
         self._handleTX(tx, peer);
       });
     }
+    if (peer === self.peers.load) {
+      self._startInterval();
+      self._startTimer();
+    }
   });
 
   this.chain.on('fork', function(block, data, peer) {
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index 12cc936a..3e3ac611 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -474,6 +474,7 @@ Framer.tx = function _tx(tx) {
   off += utils.writeU32(p, tx.locktime, off);
 
   p._cost = p.length * 4;
+  p._witnessSize = 0;
 
   return p;
 };
@@ -539,6 +540,7 @@ Framer.witnessTX = function _witnessTX(tx) {
   p._cost += 4 * 4;
 
   p._cost += witnessSize;
+  p._witnessSize = witnessSize;
 
   return p;
 };
@@ -582,6 +584,8 @@ 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;
   var i, tx, p;
@@ -597,6 +601,8 @@ Framer._block = function _block(block, witness) {
       : Framer.tx(block.txs[i]);
     txs.push(tx);
     txSize += tx.length;
+    cost += tx._cost;
+    witnessSize += tx._witnessSize;
   }
 
   p = new Buffer(80 + utils.sizeIntv(block.txs.length) + txSize);
@@ -624,10 +630,15 @@ 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 6a8c67ce..e4042ec5 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -332,6 +332,7 @@ 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;
 
@@ -353,6 +354,7 @@ Parser.parseBlock = function parseBlock(p) {
     tx._offset = off;
     off += tx._size;
     cost += tx._cost;
+    witnessSize += tx._witnessSize;
     txs.push(tx);
   }
 
@@ -368,7 +370,8 @@ Parser.parseBlock = function parseBlock(p) {
     _witness: witness,
     _raw: p,
     _size: p.length,
-    _cost: cost
+    _cost: cost,
+    _witnessSize: witnessSize
   };
 };
 
@@ -593,6 +596,7 @@ Parser.parseTX = function parseTX(p) {
     locktime: locktime,
     _witness: false,
     _cost: off * 4,
+    _witnessSize: 0,
     _raw: p.length !== off ? p.slice(0, off) : p,
     _size: off
   };
@@ -612,6 +616,7 @@ Parser.parseWitnessTX = function parseWitnessTX(p) {
   var outCount, txOut;
   var marker, flag;
   var version, locktime, i;
+  var witnessSize = 0;
 
   if (p.length < 12)
     throw new Error('Invalid witness tx size');
@@ -690,6 +695,7 @@ Parser.parseWitnessTX = function parseWitnessTX(p) {
     txIn[i]._witnessOffset = off;
     off += tx._size;
     cost += tx._size;
+    witnessSize += tx._size;
 
     if (off + 4 > p.length)
       throw new Error('Invalid witness offset');
@@ -709,7 +715,8 @@ Parser.parseWitnessTX = function parseWitnessTX(p) {
     _witness: true,
     _raw: off !== p.length ? p.slice(0, off) : p,
     _size: off,
-    _cost: cost
+    _cost: cost,
+    _witnessSize: witnessSize
   };
 };
 
diff --git a/lib/bcoin/tx-pool.js b/lib/bcoin/tx-pool.js
index 46248a46..e9f4dd05 100644
--- a/lib/bcoin/tx-pool.js
+++ b/lib/bcoin/tx-pool.js
@@ -67,8 +67,8 @@ TXPool.prototype.add = function add(tx, noWrite) {
   if (!this._wallet.ownInput(tx) && !this._wallet.ownOutput(tx))
     return false;
 
-  if (tx.type === 'tx')
-    tx = bcoin.mtx.fromTX(tx);
+  if (tx.type === 'mtx')
+    tx = tx.toTX();
 
   // Ignore stale pending transactions
   if (tx.ts === 0 && tx.ps + 2 * 24 * 3600 < utils.now()) {
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index fd96f54f..d5e1d405 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -30,6 +30,7 @@ function TX(data, block, index) {
   this.ts = data.ts || 0;
   this.block = data.block || null;
   this.index = data.index || -1;
+  this.ps = this.ts === 0 ? utils.now() : 0;
 
   this._hash = null;
   this._whash = null;
@@ -38,6 +39,7 @@ function TX(data, block, index) {
   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;