Blockchain (or more correctly "hashchain"[1] data structure) doesn't solve the double spend problem, because anyone can create a new entry with a hashpointer po

Blockchain (or more correctly "hashchain"[1] data structure) doesn't solve the double spend problem, because anyone can create a new entry with a hashpointer pointing to the last entry (aka "block") with transactions. This problem is inherent in all Nakamoto Consensus style implementations (basically Leader Election algorithms), not just Bitcoin's PoW. Simpler: anyone can fork the blockchain and over-write the ledger with the new transactions. So in reality the double spend solved by the social consensus on the right fork, not by technological solutions. EDIT: Leaving aside the question of transaction finality and probabilistic nature of the Nakamoto Consensus, which making it even worse. -- [1] https://en.wikipedia.org/wiki/Hash_chain https://en.wikipedia.org/wiki/Hash_chain