The most recent conversation between Elon Musk and Ethereum ETH co-founder Vitalik Buterin seems to have shifted from trolling to legitimate discussion.

Earlier this morning, the Tesla founder mysteriously tweeted “Ethereum.” Seven minutes later, he took it back with a cheeky “jk” (‘just kidding.’)

Musk continued to poke fun, even after Buterin invited him to attend an Ethereum developer’s conference.

Now, Musk actually asked Buterin a serious question: what’s Ethereum good for?

What should be developed on Ethereum?

“A globally accessible financial system, including payments, store of value, also more advanced stuff like insurance,” said Buterin, before referring to a smart contract system that would automatically file insurance claims for hurricane relief should extreme wind be nearby.

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