The president of the World Bank had some positive things to say about blockchain during a media appearance yesterday.

Speaking with CNBC, Jim Yong Kim said that the technology is “something everyone is excited about” – a statement that he followed up with a cautionary argument about cryptocurrencies.

“[B]lockchain technology is something that everyone is excited about, but we have to remember that bitcoin is one of the very few instances. And the other times when blockchain was used they were basically Ponzi schemes, so it’s very important that if we go forward with it, we’re sure that it’s not going to be used to exploit,” he told the network.

The World Bank – a financial institution that lends money to national governments – is no stranger to blockchain. It launched a blockchain development laboratory this past summer, and has supported research projects that seek to apply the tech in areas like capital formation.

Kim went on to compare cryptocurrencies unfavorably to payment systems like those operated by Chinese e-commerce giant Alibaba

“It takes three seconds, three seconds, to transfer as much as $160,000 to anybody who’s part of the Alibaba network, because they can assess creditworthiness in three seconds,” he said.

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