>>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 consensus around a public ledger (data), and incorporates a set of rules for encapsulation of data and associated data permissions.
So a Blockchain is only a configuration of a hashchain. So we have to make clear that blockchain is only a fancy name and nothing realy special. There are a shitload of different setups of hashchains and they mostly have no fancy name, as far as I know. Everyone with the skill can make whatever with hashchains and call it whatever.. Trianglechain.... NextgenQuantumsuperchain...ChainChain... whatever... So if the basic question is, do hashchains have real use cases? Most certainly. But I am to lazy to google.
Or does the configuration of a hashchain called blockhcain does have a real use. Atm Crypto but as far as I know some banks and supply chains and IBM tried to find problems for blockchains, but failed. Even if highly controverse, the german goverment wants to put things like the passport, diplomas and drivers licence on the blockchain. I think somehow IBM is involved. But is more or less that they want to try to sell that shit. But its not p2p whatever, only a Databank that is a blockchain.. at the end it will be a better database. Maybe a hashchain. Btw it did allready fail for the vaccines passport. They wanted to but that into 5 blockchains. At the end it was a central database, maybe a merkle tree or similar.