-// PullItemAndProcess pulls items from PullQueue and processes them.
-// For each Pull request:
-// Generate a random API token.
-// Generate a permission signature using this token, timestamp ~60 seconds in the future, and desired block hash.
-// Using this token & signature, retrieve the given block.
-// Write to storage
+// PullItemAndProcess executes a pull request by retrieving the
+// specified block from one of the specified servers, and storing it
+// on a local volume.