An 18-year-old graduate student exploited a weakness in Indexed Finance’s code and opened a legal conundrum that’s still rocking the blockchain community. Then he disappeared.

On Oct. 14, in a house near Leeds, England, Laurence Day was sitting down to a dinner of fish and chips on his couch when his phone buzzed. The text was from a colleague who worked with him on Indexed Finance, a cryptocurrency platform that creates tokens representing baskets of other tokens—like an index fund, but on the blockchain. The colleague had sent over a screenshot showing a recent trade, followed by a question mark. “If you didn’t know what you were looking at, you might say, ‘Nice-looking trade,’ ” Day says. But he knew enough to be alarmed: A user had bought up certain tokens at drastically deflated values, which shouldn’t have been possible. Something was very wrong.

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