Postchain is a mix of database and blockchain technologies. The software in this new class of blockchain-like databases is called a consortium database, because it is a distributed database which is suitable for shared use between members of a consortium.
A consortium consists of parties with a limited set of shared goals. Currently this means that an intermediary is required to ensure that access to and manipulation of the shared data is subject to the correct set of rules and restrictions. A consortium database like Postchain offers the redundancy of a replicated data store, potential resistance to ‘natural’ faults, and the ability to tolerate outright malicious actions by consortium members.