[dunkelheit]

Git almost qualifies, but it has no automatic conflict resolution mechanism. Imagine how you would program a bank using git as a database. You would put each account balance in its own file and install a hook that checks that no money is created out of thin air. Commits are transactions. Everything kind of works, but how would you prevent double spends in such a system? Double spends are like divergent branches so presumably someone will need to step in and perform a merge. But this someone then becomes a point of centralization, thereby disqualifying git as a blockchain ;)