Police seek four suspects in bitcoin fraud investigation

Police seek four suspects in bitcoin fraud investigation

Over half the identified transactions have been attributed to ATMs in Calgary, with the remainder spread between Winnipeg, Toronto, Montreal, Sherwood Park, Ottawa and Hamilton.

Canadian media reported that a total of one hundred and twelve (112) transactions have been made through the country where most took place in the Calgary province. According to the police, the suspects would initiate a withdrawal from the company's bitcoin ATM and cancel the transaction before the company could process the withdrawal.

"All four suspects are described as adult males and are believed to have in-depth knowledge or interest in cryptocurrency, Bitcoin. or blockchain technology", police said in a statement.

Each of the four suspects in the Bitcoin ATM fraud is believed to have targeted a different area.

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In the case of this Bitcoin ATM brand, it appears it was crediting unconfirmed transactions to allow money to be withdrawn before it received the suspect's Bitcoin. Besides Calgary, the suspects also conducted double-spend attacks on Bitcoin ATMs in cities like Toronto, Montreal, Winnipeg, Ottawa, and more. The Calgary Police Service pleads with the public to supply any information relevant to the apprehension of these men. The second double-spends that transaction with a transaction with higher fees, paying only the change address.

The attacks were carried out at a point that the Bitcoin ATMs accepted zero-confirmation transactions. In addition, you can optionally specify that the first transaction additional OP-RETURN, multisig, and "blacklisted" address outputs.

The Calgary Police Service is being assisted in its investigation by authorities from Toronto, Hamilton, Winnipeg, and Halton. All pertinent information regarding the suspects can be anonymously submitted to the police.

0-conf transactions are instantaneous; once the transaction is sent to the Bitcoin mempool, it is deemed completed despite the fact that miners haven't yet "mined" a block containing the transaction.

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