Before revision:  We then conduct an extensive and in-depth performance study on two blockchains, namely Quorum and Hyperledger Fabric, and three distributed databases, namely CockroachDB, TiDB and etcd.
After revision:  We then conduct an extensive and in-depth performance study on two blockchains, namely Quorum and Hyperledger Fabric, and two distributed databases, namely CockroachDB, TiDB and etcd.