CovenantSQL is a decentralized SQL database management system built on top of a blockchain. It supports most of the SQL-92 features. Each party interacting with CovenantSQL is either a client, a Block Producer, or a miner. When a client sends a connection request, the request is directed to one node among a group of nodes called Block Producers. The Block Producers form a public block chain. When a Block Producer receives a request, it allocates a number of CovenantSQL nodes, called miners. The miners self-organize into a separate block chain, called a shard chain, which runs SQL queries from the client.
CovenantSQL uses a three-level architecture, consisting of a main block chain, many shard chains, and individual miners. The main block chain is a group of nodes called Block Producers, responsible for matching clients to shard chains. Each shard chain, which is a group of computing nodes called miners, is a single database. Each miner is a standalone database engine that is responsible for storage and query processing. The miners reach consensus using a variant of Byzantine Fault-Tolerated Raft, which the developers call Kayak.
https://github.com/CovenantSQL/CovenantSQL
https://godoc.org/github.com/CovenantSQL/CovenantSQL,http://developers.covenantsql.io/docs/en/intro
Covenant Labs
2018
Go, Java, JavaScript, Python, SQL