After the BitMEX disaster on the crypto exchanges recently, the famous cryptocurrency exchange Coincheck; reported that their users were facing a problem where their personal information was leaked. With the announcement made during the day, the Exchange announced that the e-mails of the users and the personal information requested at the registration stage were subject to a violation. According to the statement, the users’ name, residence, date of birth, personal phone information and identity images were leaked. He reported that the error affected not only all users but 200 customers who traded between May 31 and June 1, but this problem is not to be underestimated. Although the customer assets are reported to be unaffected, the users’ trusting information to be uploaded attracted a great reaction from Coincheck users. After this process, the stock exchange, which temporarily stops the crypto transfer transactions; currently only allows trading, withdrawals and deposits. This is not the first problem Coincheck experienced. In January 2018, Coincheck was attacked by hackers and stole around $ 500 million. The stock exchange, which previously served without license, was bought by the Japan-based Monex Group for $ 33.5 million after the problem in 2018 and started to continue its services under license.