Public data suggests that several anonymous crypto investors profited from inside knowledge of when tokens would be listed on exchanges.

Over six days last August, one crypto wallet amassed a stake of $360,000 worth of Gnosis coins, a token tied to an effort to build blockchain-based prediction markets. On the seventh day, Binance — the world's largest cryptocurrency exchange by volume — said in a blog post that it would list Gnosis, allowing it to be traded among its users.