Coinbase executive Conor Grogan posted on social media that yesterday's "dormant 14-year-old Bitcoin ancient whale $8,000,000,000 $BTC transfer" may have involved stolen or leaked private keys. Conor discovered that one hour before the large-scale transfer of $BTC assets from the whale's wallet, one of the wallets conducted a test transaction of Bitcoin Cash ($BCH) and immediately transferred all BCH. Conor believes that this behavior pattern is unusual. Other $BCH wallets were not used, and $BCH is usually less monitored by whale monitoring services, which 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 just speculation, if it is true, it may be the largest digital asset theft case in human history. [ChainCatcher]