Immutable Log Storage as a Service
This addresses the need for tamper-proof log storage as digital evidence in cloud computing, though it is incremental as it builds on existing blockchain technology.
The paper tackled the problem of ensuring immutable and verifiable log storage for cloud services by proposing Logchain, a blockchain-based system integrated with Ethereum, achieving scalability of 100 log files per second and an average sealing time of 23 seconds.
Logs contain critical information about the quality of the rendered services on the Cloud and can be used as digital evidence. Hence, we argue that the critical nature of logs calls for immutability and verification mechanism without the presence of a single trusted party. In this paper, we propose a blockchain-based log system, called Logchain, which can be integrated with existing private and public blockchains. To validate the mechanism, we create Logchain as a Service (LCaaS) by integrating it with Ethereum public blockchain network. We show that the solution is scalable (being able to process 100 log files per second) and fast (being able to "seal" a log file in 23 seconds, on average).