Comparative Study Between Aura and Clique Blockchain-Based Proof of Authority Algorithms on Wireless Sensor Network

Using blockchain in Wireless Sensor Network (WSN) has solved the problems of centralized authority, heterogeneity, authentication, and security. However, no blockchain consensus is intended for WSN applications. Usually, permissioned blockchain is used to integrate into the WSN because of its fast transaction time and easy management member. This study compared two permissioned blockchains consensuses Proof-of-Authority algorithms named Aura and Clique to determine which algorithm is more appropriate for WSN. We compare the suitability of Aura and Clique algorithms, how they work on WSN topology and evaluate each algorithm’s transaction speed and block drop. The result shows the transaction speed of Aura has a transaction time of 31.62ms, slower than Clique, which only requires 6.03ms for 100 transactions. Aura has no dropped blocks, whereas Clique has approximately 8 dropped blocks in the number of transactions. This happens because the Clique algorithm has a GHOST protocol that only stores the blocks proposed by one Leader. Aura has a longer transaction time, but Aura does not have discarded blocks. All data from WSN can enter the network. Thus, Aura is more suitable than Clique to apply to WSN.