Lisk Restaurant sidechain, evolution from Lisk SDK 2.3.8 to 5.0.3, evaluation of improvements in performance and security.

In this paper, we evaluate the benefits of the Lisk SDK version, 5.0.3, over the old version of Lisk SDK 2.3.8 using the Restaurant sidechain solution created as a Proof-Of-Concept of online food requests using Lisk blockchain technology. We evaluated the Restaurant sidechain in aspects of performance, the capacity of receiving transactions in a short amount of time, the maximum waiting time for customers requesting food, consensus improvements of Lisk-BFT, and transaction spam attack resilience. It was observed the aspects of block size, transaction pool size, communication between nodes, and analyzed security concerns regarding liveness and Denial of Service attacks in the sidechain. In the end, we concluded that the new version of Lisk SDK 5.0 demonstrated improvements in size capacity of a block, and therefore improved Lisk Restaurant capacity to receive customers food requests, also transaction pool size improvement, and the creation of a mitigation strategy implemented on node life cycle reduced the chance of interruption on the entire network during a transaction spam attack.