diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index 38f30930..450ee4e7 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -74,7 +74,7 @@ function Mempool(options) {
   this.chain = this.options.chain;
   this.fees = this.options.fees;
 
-  this.locker = new Lock(true);
+  this.locker = this.chain.locker;
 
   this.size = 0;
   this.totalOrphans = 0;
@@ -1479,46 +1479,6 @@ Mempool.prototype.isDoubleSpend = function isDoubleSpend(tx) {
   return false;
 };
 
-/**
- * Get coin viewpoint (no lock).
- * @param {TX} tx
- * @param {CoinView} view
- * @returns {Promise} - Returns {@link CoinView}.
- */
-
-Mempool.prototype.getCoinView = co(function* getCoinView(tx) {
-  var state = this.chain.state;
-  var view = new CoinView();
-  var prevout = tx.getPrevout();
-  var i, entry, hash, coins;
-
-  for (i = 0; i < prevout.length; i++) {
-    hash = prevout[i];
-    entry = this.getEntry(hash);
-
-    if (entry) {
-      view.addTX(entry.tx, -1);
-      continue;
-    }
-
-    coins = yield this.chain.db.getCoins(hash);
-
-    if (!coins) {
-      coins = new Coins();
-      coins.hash = hash;
-      view.add(coins);
-      continue;
-    }
-
-    view.add(coins);
-  }
-
-  if (state !== this.chain.state)
-    throw new Error('Chain state changed while getting coins.');
-
-  return view;
-});
-
 /**
  * Get coin viewpoint (lock).
  * @param {TX} tx
@@ -1526,8 +1486,7 @@ Mempool.prototype.getCoinView = co(function* getCoinView(tx) {
  * @returns {Promise} - Returns {@link CoinView}.
  */
 
-Mempool.prototype._getCoinView = co(function* getCoinView(tx) {
-  var state = this.chain.state;
+Mempool.prototype.getCoinView = co(function* getCoinView(tx) {
   var view = yield this.chain.db.getCoinView(tx);
   var items = view.toArray();
   var i, coins, entry;
@@ -1546,9 +1505,6 @@ Mempool.prototype._getCoinView = co(function* getCoinView(tx) {
     view.addTX(entry.tx, -1);
   }
 
-  if (state !== this.chain.state)
-    throw new Error('Chain state changed while getting coins.');
-
   return view;
 });