From 9b266c6ec798305b281fd0eb0a12be6363b7571e Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Thu, 21 Jan 2016 18:28:04 -0800
Subject: [PATCH] minor.

---
 lib/bcoin/chain.js | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index 62dee6e0..1281c958 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -543,7 +543,7 @@ Chain.prototype.locatorHashes = function locatorHashes(start) {
     top = start;
   }
 
-  assert(this.db.get(top));
+  assert(this.db.has(top));
 
   i = top;
   for (;;) {
@@ -553,7 +553,7 @@ Chain.prototype.locatorHashes = function locatorHashes(start) {
     i = i - step;
     if (i <= 0) {
       if (i + step !== 0)
-        hashes.push(this.db.get(0).hash);
+        hashes.push(network.genesis.hash);
       break;
     }
     if (hashes.length >= 10)
@@ -999,6 +999,20 @@ ChainDB.prototype.isNull = function isNull(height) {
   return utils.read32(data, 0) === 0;
 };
 
+ChainDB.prototype.has = function has(height) {
+  var data;
+
+  if (this._queue[height] || this._cache[height])
+    return true;
+
+  data = this._readSync(4, height * BLOCK_SIZE);
+
+  if (!data)
+    return false;
+
+  return utils.read32(data, 0) !== 0;
+};
+
 ChainDB.prototype._readSync = function _readSync(size, offset) {
   var index = 0;
   var data, bytes;