1月26日深夜、仮想通貨取引所のコインチェックが扱っていた仮想通貨ＮＥＭ（ネム）約580億円分が不正流出した。犯行時間はおよそ5分とされている。コインチェックは翌日の昼過ぎからＮＥＭの入金や売買、出金を続けざまに停止。ビットコイン以外の仮想通貨の取引も中止され、止まっていた日本円の出金は2月13日に再開された。流出の詳細は調査中だが、被害の大きさは甚大だ。セキュリティ面の対策と仮想通貨業者の課題をJapan Digital DesignのCTO、楠正憲氏に聞いた。（ダイヤモンド・オンライン編集部 松野友美）
Announcement regarding the resumption of JPY withdrawals
?There has been a temporary suspension in place on withdrawals of JPY from the Coincheck platform in order to protect and ensure the integrity of customer assets. This notice is to announce that with the help of outside experts we have been able confirm the security of our system and plan to resume JPY withdrawals beginning on the following date.? Regarding resumptions of JPY withdrawals Currently, all customer JPY assets are being stored in a customer-specific account in a major financial institution. We plan to resume normal operations for JPY withdrawals from the following date and will process customer requests in the order in which they come in.
- This is an announcement concerning withdrawals of customer-owned JPY assets. The date listed above is unrelated to reparation payments for the XEM that were illicitly transferred from our platform. - We will be completing withdrawal requests in the order that they come in, so it may take a short period of time after withdrawals resume before your transfer is completed. - We may contact customers separately in order to confirm certain details of withdrawal requests. -If further complications preventing the safe resumption of withdrawals are discovered, the resumption date may be extended in order to guarantee customer asset security.
We plan to lift restrictions on withdrawals of cryptocurrencies and other temporary feature restrictions as soon as we are able to guarantee the secure resumption of operations for each feature. We will provide further details as soon as they are available.