sync first attempt

lib/services/block.js

@@ -206,9 +206,27 @@ BlockService.prototype.getLatest = function() {
 
     return self.getBlock(blockHash);
 
-  }).catch(blockNotFound);
+  }).catch(function(err) {
+    if (err instanceof LevelUp.errors.NotFoundError) {
+      return null;
+    }
+    throw err;
+  });
 };
 
+
+/**
+ * Save a new block
+ *
+ * @param {bitcore.Block} block
+ * @return {Promise<Block>} a promise of the same block, for chaining
+ */
+BlockService.prototype.save = function(block) {
+  // TODO: unconfirm previous tip, confirm new tip. 
+  return this._confirmBlock(block);
+};
+
+
 /**
  * Set a block as the current tip of the blockchain
  *
@@ -250,11 +268,9 @@ BlockService.prototype._confirmBlock = function(block) {
 
   }).then(function() {
 
-    return self.database.batchAsync(ops)
+    return self.database.batchAsync(ops);
 
-  }).then(function() {
-    return self.unlock();
-  });
+  }).then(this.unlock.bind(this));
 };
 
 BlockService.prototype._setNextBlock = function(ops, prevBlockHash, block) {

package.json

@@ -60,7 +60,8 @@
     "glob": "*",
     "js-yaml": "^3.2.7",
     "level-lock": "^1.0.1",
-    "levelup": "~0.19.0",
+    "leveldown": "^1.0.0",
+    "levelup": "^0.19.0",
     "moment": "~2.5.0",
     "morgan": "^1.5.1",
     "request": "^2.48.0",