A survey for historical data computing and management of aws qldb and tencent tdsql. Introduction to amazon quantum ledger database (qldb). A next-generation smart contract and decentralized application platform. Electronically verified digital signature and document delivery system and method, July 25 2006. Temporal database system implementations. In Proceedings of the Thirteenth EuroSys Conference, page 30. Hyperledger fabric: a distributed operating system for permissioned blockchains. White Paper, From the Libra Association members, 2019. Alibaba cloud baas(blockchain as a service). In Proceedings of the 16th International Conference on Extending Database Technology, pages 573-578. In VLDB'02: Proceedings of the 28th International Conference on Very Large Databases, pages 143-154. In Proceedings of the Thirtieth international conference on Very large data bases-Volume 30, pages 516-527. Auditing compliance with a hippocratic database. Many blockchain customers (e.g., IP protection and supply chain) on Alibaba Cloud have switched to LedgerDB for its high throughput, low latency, strong auditability, and ease of use. Experimental evaluation shows that LedgerDB's throughput is 80X higher than state-of-the-art permissioned blockchain (i.e., Hyperledger Fabric). LedgerDB supports verifiable data removals demanded by many real-world applications, which are able to remove obsolete records for storage saving and hide records for regulatory purpose, without compromising its verifiability. It offers stronger auditability by adopting a TSA two-way peg protocol, which prevents malicious behaviors from both users and service providers. LedgerDB has much higher throughput compared to blockchains. Hence, we propose LedgerDB on Alibaba Cloud, which is a centralized ledger database with tamper-evidence and non-repudiation features similar to blockchain, and provides strong auditability. When decentralized architecture is used but not required, system performance is often restricted, resulting in low throughput, high latency, and significant storage overhead. However, we observe that in practice, many applications on permissioned blockchains do not benefit from the decentralized architecture. The emergence of Blockchain has attracted widespread attention.
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