CBC reports that four Canadian men are wanted in connection with conducting double-spend attacks against Bitcoin ATMs in four cities. A total of 112 transactions are alleged to have taken place in September last year, with half of them taking place in Calgary. The other attacks took place in Winnipeg, Toronto, Montreal, Sherwood Park, Ottawa and Hamilton. The men’s identities are unknown, and Calgary police are asking for help identifying them. Double-Spending on a Bitcoin ATM: A Lucrative Criminal Enterprise Apparently, the Bitcoin ATMs accepted zero-confirmation transactions, and the men exploited this fact to double-spend Bitcoin in exchange for cash.
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