(Bloomberg) -- The co-founder of OpenSea said the non-fungible token marketplace is investigating a “phishing attack,” which doesn’t appear to be active.

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“We don’t believe it’s connected to the OpenSea website,” Devin Finzer, who is also its chief executive officer, said on Twitter. “It appears 32 users thus far have signed a malicious payload from an attacker, and some of their NFTs were stolen.”

NFTs are digital tokens that act like certificates of authenticity for, and in some cases represent ownership of, assets that range from expensive illustrations of apes to collectibles like celebrity autographs and physical goods like a case of rare whiskey.

Some of the NFTs have been returned, and there hasn’t been further malicious activity seen from the attacker’s account, Finzer said.

He also dispelled rumors of a $200 million hack, saying the attacker has $1.7 million of Ethereum in his wallet from selling some of the stolen NFTs.

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