[pests]

Just semantics.

You can search right now and find programming 'blockchain tutorials', targeting the cryptocurrency community, that go on to describe only linked blocks chained together via some embedded hash of a subset of the previous blocks (meta)data. This is what others in various comments are calling a cryptograpically secured blockchain.

Other tutorials will set up a mempool (pending transactions) or get peers communicating. I've never seen peer discovery or any discussion on chain value (ie height vs accumulated difficulty) for chain selection.