If each block contains the hash of the previous block, then I think that it is a blockchain (regardless of if there is multiple authors or only a single author). A git repository is a blockchain, too.
Or simply a 'hash chain':
> A hash chain is similar to a blockchain, as they both utilize a cryptographic hash function for creating a link between two nodes. However, a blockchain (as used by Bitcoin and related systems) is generally intended to support distributed agreement around a public ledger (data), and incorporates a set of rules for encapsulation of data and associated data permissions.
* https://en.wikipedia.org/wiki/Hash_chain
Or perhaps:
> Linked timestamping creates time-stamp tokens which are dependent on each other, entangled in some authenticated data structure. Later modification of the issued time-stamps would invalidate this structure. The temporal order of issued time-stamps is also protected by this data structure, making backdating of the issued time-stamps impossible, even by the issuing server itself.
* https://en.wikipedia.org/wiki/Linked_timestamping
An(other) example of the latter:
This document describes a mechanism, called syslog-sign in this
document, that adds origin authentication, message integrity, replay
resistance, message sequencing, and detection of missing messages to
syslog. Essentially, this is accomplished by sending a special
syslog message. The content of this syslog message is called a
Signature Block. Each Signature Block contains, in effect, a
detached signature on some number of previously sent messages. It is
cryptographically signed and contains the hashes of previously sent
syslog messages. The originator of syslog-sign messages is simply
referred to as a "signer". The signer can be the same originator as
the originator whose messages it signs, or it can be a separate
originator.
* https://csrc.nist.gov/publications/detail/nistir/8202/final
Figure 6 is a good flowchart on helping a person decide whether it's a good solution for particular use cases. See "Distributed ledger need: blockchain, block matrix, or none?" at the bottom of:
* https://csrc.nist.gov/Projects/enhanced-distributed-ledger-t...
That's a flawed understanding all the way around.
[1] https://www.vice.com/en/article/j5nzx4/what-was-the-first-bl...
What if the hash is published in multiple newspapers.