Proponents of permissioned or private chains argue that the term "blockchain" may be applied to any data structure that batches data into timestamped blocks, these blockchains serve as a distributed version of multiversion concurrency control (MVCC) in databases.
The term "blockchain" may be applied to any data structure that batches data into timestamped blocks serve as a distributed version of multiversion concurrency control (MVCC) in databases. This is what proponents of permissioned or private chains argue. Timestamped blocks are these blockchains.