What problem does a blockchain solve?

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Show me an application where blockchain is essential. That is, a problem that could not have been solved without a blockchain that now can be solved with it. You can consider either a normal blockchain or in the case of Ethereum, a Turing Complete blockchain.

What would be your reply to this without consulting anything? Don't get me wrong, I believe in this more than I am comfortable to admit, but it's always healthy to take a step back, look at things from the side of your opposition and refute their statements.