Self-Diagnosing and Healing System for Reliable Hybrid P2P-based Blockchain Against Abnormal Node Failure

This work proposes a self-diagnosing and healing system for a fast and reliable blockchain service in a multi-cloud environment. Basically, the proposed whole system is implemented to concurrently satisfy both scalability and reliability in blockchain systems. At first, a hybrid P2Pbased structure is adopted for block transmission to enhance the scalability. However, it may be vulnerable to abnormal nodes that are experiencing network layer attacks and vulnerabilities. Thus, the proposed system is designed to frequently check as many nodes as possible in order to detect abnormal nodes and quickly exclude them from the block transmission path. The proposed system is fully built by using various open-source tools (e.g. Mininet, Docker, and Containernet). Finally, the experimental results show that the proposed system improves the reliability of blockchain service compared with P2P tree-based systems at the cost of slightly increased block reception delay, and significantly enhances the scalability compared with existing Gossip-based systems.