Hex Trust, the Asia-based institutional-grade digital asset custodian, has added Dr. Dimitrios Kavvathas and Marty Jetton to its advisory board. Kavvathas spent 12 years as a managing director and partner at Goldman Sachs in London, before relocating to Hong Kong in 2009 where he co-headed the Asia Pacific securities division distribution. Jetton transitions to the advisory board from his role as chief network officer and previously COO at Hex Trust.