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Your example isn’t a blockchain, it’s just an example of an immutable database with a linked list structure. A blockchain has to have all three elements, else it’s just a previous technology that is already in use and has been for decades. Immutable databases already existed. Public ledgers already existed. Cryptographically hashed databases and audit tables already existed (CQRS with event sourcing is an example of this).
Your examples around affecting the physical world still are not accurate. If the blockchain has a contract in it that says “dispense a snack” then it’s completely dependent on what happens in the real world. Maybe the snack doesn’t dispense, maybe there isn’t a snack to dispense, maybe the user tricks the machine into thinking it didn’t dispense a snack so it dispenses two. There is no way for the blockchain to validate the results of reality. It’s just not possible. The entire premise of the blockchain is that you can remove authority, remove government, remove all this in between and just have users validate each other. It’s just not possible. It completely ignores reality.