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Carlos Topo Maseda was at a friend’s wedding in Puerto Escondido, Mexico, last November when he began to panic.

A flurry of tweets claimed that Hic Et Nunc, the NFT marketplace where he had spent much of the past year creating and buying non-fungible tokens, had suddenly closed. The project’s website returned an error, his Twitter account had been discontinued, and Topo Maseda was unable to access any of his NFTs.

“From one day to the next they disappeared,” he said.

Topo Maseda eventually recovered his NFTs from a cloned website that copied Hic Et Nunc’s open source code, but no…