Thomson Reuters This story was delivered to BI Intelligence "Payments Industry Insider" subscribers. To learn more and subscribe, please click here. Digital Currency Group (DCG), a Bitcoin and blockchain investment and collaboration hub, recently added members to its board and staff alongside the close of a major funding round. Most notably, the firm added former US Treasury Secretary Lawrence Summers as a senior adviser. The addition of an adviser with policy expertise could indicate that DCG is preparing for regulatory changes.