fix block subscription

lib/block.js

@@ -50,6 +50,7 @@ Block.fromBufferReader = function(br) {
 
 Block.prototype.toObject = Block.prototype.toJSON = function() {
   return {
+    hash: this.hash,
     version: this.version,
     prevHash: this.prevHash,
     merkleRoot: this.merkleRoot,

lib/db.js

@@ -234,7 +234,7 @@ DB.prototype.blockHandler = function(block, add, callback) {
 
   // Notify block subscribers
   for(var i = 0; i < this.subscriptions.block.length; i++) {
-    this.subscriptions.transaction[i].emit('block', block.hash);
+    this.subscriptions.block[i].emit('block', block.hash);
   }
 
   async.eachSeries(