Coinbase director Conor Grogan posted on social media that yesterday's "14-year-dormant Bitcoin ancient whale transferred $8 billion worth of BTC" may have caused the private key to be stolen or leaked. Conor found that one hour before the whale wallet made a large-scale transfer of BTC assets, one of the wallets conducted a test transaction of Bitcoin Cash (BCH) and then transferred out all BCH. Conor believes that this behavior pattern is unusual. Other BCH wallets have not been used. BCH is usually less concerned by whale monitoring services. It may be a low-key way to test private keys. He speculates that these wallets are unlikely to be exchange wallets. Conor said that although this is only speculation, if it is true, this may be the largest digital asset theft in human history.