  With the rapid growth of Internet of Things (IoT) applications, there's a big
demand for more processing power and resources in devices. Mobile Edge
Computing (MEC) looks promising for enhancing performance and reducing costs by
offloading the computing work of IoT to MEC servers. However, the current
methods for offloading have issues with privacy and security during the
transfer of data and programs. To tackle this, recent developments have
introduced secure offloading methods using Blockchain technology, which helps
to make MEC more secure by building trust between nodes, improving how edges
are authenticated and accessed, and stopping unauthorized access to devices.
This paper reviews these Blockchain-based offloading methods for different MEC
settings. It starts by explaining the key ideas in offloading and Blockchain,
then it sorts the Blockchain-based offloading methods by the algorithms they
use. It also compares the offloading methods in each group and ends with a
discussion and comparison of the different techniques, tools, and metrics used
in these methods.
