diff --git a/lib/services/bitcoind.js b/lib/services/bitcoind.js
index 95bada78..4c70f910 100644
--- a/lib/services/bitcoind.js
+++ b/lib/services/bitcoind.js
@@ -130,7 +130,7 @@ Bitcoin.prototype._loadConfiguration = function() {
   );
 
   $.checkState(
-    this.configuration.zmqpubhashtx,
+    this.configuration.zmqpubhashblock,
     '"zmqpubhashblock" option is required to get event updates from bitcoind. ' +
       'Please add "zmqpubhashblock=tcp://127.0.0.1:<port>" to your configuration and restart'
   );
@@ -632,7 +632,7 @@ Bitcoin.prototype.getAddressSummary = function(addressArg, options, callback) {
  * Will retrieve a block as a Node.js Buffer from disk.
  * @param {String|Number} block - A block hash or block height number
  */
-Bitcoin.prototype.getBlock = function(block, callback) {
+Bitcoin.prototype.getBlock = function(blockArg, callback) {
   // TODO apply performance patch to the RPC method for raw data
   var self = this;
 
@@ -641,20 +641,20 @@ Bitcoin.prototype.getBlock = function(block, callback) {
       if (err) {
         return callback(err);
       }
-      var blockCache = bitcore.Block.fromString(response.result);
-      self.blockCache.set(block, blockCache);
-      callback(null, blockCache);
+      var blockObj = bitcore.Block.fromString(response.result);
+      self.blockCache.set(blockArg, blockObj);
+      callback(null, blockObj);
     });
   }
 
-  var cachedBlock = self.blockCache.get(block);
+  var cachedBlock = self.blockCache.get(blockArg);
   if (cachedBlock) {
     return setImmediate(function() {
       callback(null, cachedBlock);
     });
   } else {
-    if (_.isNumber(block)) {
-      self.client.getBlockHash(block, function(err, response) {
+    if (_.isNumber(blockArg)) {
+      self.client.getBlockHash(blockArg, function(err, response) {
         if (err) {
           return callback(err);
         }
@@ -662,7 +662,7 @@ Bitcoin.prototype.getBlock = function(block, callback) {
         queryBlock(blockhash);
       });
     } else {
-      queryBlock(block);
+      queryBlock(blockArg);
     }
   }