According to Coinbase's product chief, Conor Grogan, there is a small possibility that the US$8.6 billion in #Bitcoin that moved on Thursday, from eight wallets that had held BTC for more than 14 years, was due to a hack, and if so, it could be the largest theft in history. The blockchain intelligence firm Arkham stated that it was a single entity that moved US$8.6 billion in Bitcoin value from eight separate wallets.